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|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
17,400 |
0907.3825
|
Alberto Porzio
|
Virginia D'Auria, Corrado de Lisio, Alberto Porzio, Salvatore
Solimeno, Javaid Anwar, and Matteo G. A. Paris
|
Non-Gaussian states produced by close-to-threshold optical parametric
oscillators: role of classical and quantum fluctuations
|
10 pages, new figure added
|
Phys. Rev. A 81, 033846 (2010) [9 pages]
|
10.1103/PhysRevA.81.033846
| null |
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Quantum states with non-Gaussian statistics generated by optical parametric
oscillators (OPO) with fluctuating parameters are studied by means of the
Kurtosis excess of the external field quadratures. The field generated is
viewed as the response of a nonlinear device to the fluctuations of laser pump
amplitude and frequency, crystal temperature and cavity detuning, in addition
to quantum noise sources. The Kurtosis excess has been evaluated perturbatively
up to the third order in the strength of the crystal nonlinear coupling factor
and the second order in the classical fluctuating parameters. Applied to the
device described in Opt. Expr. 13, 948-956 (2005) the model has given values of
the Kurtosi excess in good agreement with the measured ones.
|
[{'version': 'v1', 'created': 'Wed, 22 Jul 2009 12:38:13 GMT'}
{'version': 'v2', 'created': 'Wed, 16 Dec 2009 15:14:23 GMT'}
{'version': 'v3', 'created': 'Fri, 12 Feb 2010 13:25:08 GMT'}]
|
2010-03-31
|
[array(["D'Auria", 'Virginia', ''], dtype=object)
array(['de Lisio', 'Corrado', ''], dtype=object)
array(['Porzio', 'Alberto', ''], dtype=object)
array(['Solimeno', 'Salvatore', ''], dtype=object)
array(['Anwar', 'Javaid', ''], dtype=object)
array(['Paris', 'Matteo G. A.', ''], dtype=object)]
|
17,401 |
2204.10441
|
Nikita Dobronravov
|
Nikita P. Dobronravov
|
Frostman lemma revisited
|
15 pages, 1 figure
| null | null | null |
math.CA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study sharpness of various generalizations of Frostman's lemma. These
generalizations provide better estimates for the lower Hausdorff dimension of
measures. As a corollary, we prove that if a generalized anisotropic gradient
$(\partial_1^{m_1} f, \partial_2^{m_2} f,\ldots, \partial_d^{m_d} f)$ of a
function $f$ in $d$ variables is a measure of bounded variation, then this
measure is absolutely continuous with respect to the Hausdorff $d-1$
dimensional measure.
|
[{'version': 'v1', 'created': 'Fri, 22 Apr 2022 00:12:56 GMT'}]
|
2022-04-25
|
[array(['Dobronravov', 'Nikita P.', ''], dtype=object)]
|
17,402 |
2212.07182
|
Zengfu Wang
|
Xianglong Bai and Hua Lan and Zengfu Wang and Quan Pan and Yuhang Hao
and Can Li
|
Robust Multitarget Tracking in Interference Environments: A
Message-Passing Approach
|
21 pages, 21 figures
| null | null | null |
eess.SY cs.SY
|
http://creativecommons.org/licenses/by/4.0/
|
Multitarget tracking in the interference environments suffers from the
nonuniform, unknown and time-varying clutter, resulting in dramatic performance
deterioration. We address this challenge by proposing a robust multitarget
tracking algorithm, which estimates the states of clutter and targets
simultaneously by the message-passing (MP) approach. We define the
non-homogeneous clutter with a finite mixture model containing a uniform
component and multiple nonuniform components. The measured signal strength is
utilized to estimate the mean signal-to-noise ratio (SNR) of targets and the
mean clutter-to-noise ratio (CNR) of clutter, which are then used as additional
feature information of targets and clutter to improve the performance of
discrimination of targets from clutter. We also present a hybrid data
association which can reason over correspondence between targets, clutter, and
measurements. Then, a unified MP algorithm is used to infer the marginal
posterior probability distributions of targets, clutter, and data association
by splitting the joint probability distribution into a mean-field approximate
part and a belief propagation part. As a result, a closed-loop iterative
optimization of the posterior probability distribution can be obtained, which
can effectively deal with the coupling between target tracking, clutter
estimation and data association. Simulation results demonstrate the performance
superiority and robustness of the proposed multitarget tracking algorithm
compared with the probability hypothesis density (PHD) filter and the
cardinalized PHD (CPHD) filter.
|
[{'version': 'v1', 'created': 'Wed, 14 Dec 2022 12:12:47 GMT'}]
|
2022-12-15
|
[array(['Bai', 'Xianglong', ''], dtype=object)
array(['Lan', 'Hua', ''], dtype=object)
array(['Wang', 'Zengfu', ''], dtype=object)
array(['Pan', 'Quan', ''], dtype=object)
array(['Hao', 'Yuhang', ''], dtype=object)
array(['Li', 'Can', ''], dtype=object)]
|
17,403 |
1309.1691
|
Fr\'ed\'eric Marin
|
Frederic Marin, Delphine Porquet, Rene W. Goosmann, Michal Dovciak,
Fabio Muleri, Nicolas Grosso and Vladimir Karas
|
Modelling the X-ray polarimetric signatures of complex geometry: the
case study of the "changing look" AGN NGC 1365
|
6 pages, 4 figures, accepted for publication in the Monthly Notices
of the Royal Astronomical Society
| null |
10.1093/mnras/stt1677
| null |
astro-ph.HE astro-ph.CO gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
"Changing look" Active Galactic Nuclei (AGN) are a subset of Seyfert galaxies
characterized by rapid transitions between Compton-thin and Compton-thick
regimes. In their Compton-thin state, the central engine is less obscured,
hence spectroscopy or timing observations can probe their innermost structures.
However, it is not clear if the observed emission features and the Compton hump
are associated with relativistic reflection onto the accretion disc, or complex
absorption by distant, absorbing gas clouds passing by the observer's
line-of-sight. Here, we investigate these two scenarios under the scope of
X-ray polarimetry, providing the first polarisation predictions for an
archetypal "changing look" AGN: NGC 1365. We explore the resulting polarisation
emerging from lamp-post emission and scattering off an accretion disc in the
immediate vicinity of a supermassive black hole. The computed polarisation
signatures are compared to the results of an absorption-dominated model, where
high column density gas partially covers the central source. While the shape of
the polarisation spectrum is similar, the two models differ in net polarisation
percentage, with the relativistic reflection scenario producing significantly
stronger polarisation. Additionally, the variation of the polarisation position
angle is distinctly different between both scenarios: the reflection-dominated
model produces smooth rotations of the polarisation angle with photon energy
whereas circumnuclear absorption causes an orthogonal switch of the
polarisation angle between the soft and the hard X-ray bands. By comparing the
predicted polarisation of NGC 1365 to the detectability levels of X-ray
polarimetry mission concepts proposed in the past, we demonstrate that with a
large, soft X-ray observatory or a medium-sized mission equipped with a hard (6
- 35 keV) polarimeter, the correct interpretation would be unambiguous.
|
[{'version': 'v1', 'created': 'Fri, 6 Sep 2013 16:19:27 GMT'}]
|
2013-09-09
|
[array(['Marin', 'Frederic', ''], dtype=object)
array(['Porquet', 'Delphine', ''], dtype=object)
array(['Goosmann', 'Rene W.', ''], dtype=object)
array(['Dovciak', 'Michal', ''], dtype=object)
array(['Muleri', 'Fabio', ''], dtype=object)
array(['Grosso', 'Nicolas', ''], dtype=object)
array(['Karas', 'Vladimir', ''], dtype=object)]
|
17,404 |
1704.08089
|
Edesio Barboza Jr
|
C. Rodrigues Filho and Ed\'esio M. Barboza Jr
|
Constraints on kinematic parameters at $z\ne0$
|
16 pages, 6 tables, 5 figures, accepted for publication in JCAP
| null |
10.1088/1475-7516/2018/07/037
| null |
astro-ph.CO gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The standard cosmographic approach consists in performing a series expansion
of a cosmological observable around $z=0$ and then using the data to constrain
the cosmographic (or kinematic) parameters at present time. Such a procedure
works well if applied to redshift ranges inside the $z$-series convergence
radius ($z<1$), but can be problematic if we want to cover redshift intervals
that fall outside the $z-$series convergence radius. This problem can be
circumvented if we work with the $y-$redshift, $y=z/(1+z)$, or the scale
factor, $a=1/(1+z)=1-y$, for example. In this paper, we use the scale factor
$a$ as the variable of expansion. We expand the luminosity distance and the
Hubble parameter around an arbitrary $\tilde{a}$ and use the Supernovae Ia (SNe
Ia) and the Hubble parameter data to estimate $H$, $q$, $j$ and $s$ at $z\ne0$
($\tilde{a}\neq1$). We show that the last relevant term for both expansions is
the third. Since the third order expansion of $d_L(z)$ has one parameter less
than the third order expansion of $H(z)$, we also consider, for completeness, a
fourth order expansion of $d_L(z)$. For the third order expansions, the results
obtained from both SNe Ia and $H(z)$ data are incompatible with the
$\Lambda$CDM model at $2\sigma$ confidence level, but also incompatible with
each other. When the fourth order expansion of $d_L(z)$ is taken into account,
the results obtained from SNe Ia data are compatible with the $\Lambda$CDM
model at $2\sigma$ confidence level, but still remains incompatible with
results obtained from $H(z)$ data. These conflicting results may indicate a
tension between the current SNe Ia and $H(z)$ data sets.
|
[{'version': 'v1', 'created': 'Wed, 26 Apr 2017 13:06:26 GMT'}
{'version': 'v2', 'created': 'Wed, 11 Jul 2018 14:23:41 GMT'}]
|
2018-08-01
|
[array(['Filho', 'C. Rodrigues', ''], dtype=object)
array(['Barboza', 'Edésio M.', 'Jr'], dtype=object)]
|
17,405 |
1206.0626
|
Taras Banakh
|
Taras Banakh, Ostap Chervak, and Lubomyr Zdomskyy
|
On character of points in the Higson corona of a metric space
|
12 pages
|
Comment. Math. Univ. Carolin. 54:2 (2013) 159-178
| null | null |
math.GN math.MG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We prove that for an unbounded metric space $X$, the minimal character
$m\chi(\check X)$ of a point of the Higson corona $\check X$ of $X$ is equal to
$\mathfrak u$ if $X$ has asymptotically isolated balls and to $\max\{\mathfrak
u,\mathfrak d\}$ otherwise. This implies that under $\mathfrak u<\mathfrak d$ a
metric space $X$ of bounded geometry is coarsely equivalent to the Cantor
macro-cube $2^{<\IN}$ if and only if $\dim(\check X)=0$ and $m\chi(\check
X)=\mathfrak d$. This contrasts with a result of Protasov saying that under CH
the coronas of any two asymptotically zero-dimensional unbounded metric
separable spaces are homeomorphic.
|
[{'version': 'v1', 'created': 'Mon, 4 Jun 2012 14:00:37 GMT'}]
|
2013-05-28
|
[array(['Banakh', 'Taras', ''], dtype=object)
array(['Chervak', 'Ostap', ''], dtype=object)
array(['Zdomskyy', 'Lubomyr', ''], dtype=object)]
|
17,406 |
2105.09921
|
Samuel Navarro-Meza
|
Samuel Navarro-Meza, Erin Aadland, David Trilling
|
Asteroid lightcurves and detection, shape, and size biases in
large-scale surveys
|
3 pages, 1 figure
|
Res. Notes AAS 5 111 (2021)
| null | null |
astro-ph.EP
|
http://creativecommons.org/licenses/by/4.0/
|
Most asteroids are somewhat elongated and have non-zero lightcurve
amplitudes. Such asteroids can be detected in large-scale sky surveys even if
their mean magnitudes are fainter than the stated sensitivity limits. We
explore the detection of elongated asteroids under a set of idealized but
useful approximations. We find that objects up to 1 magnitude fainter than a
survey's sensitivity limit are likely to be detected, and that the effect is
most pronounced for asteroids with lightcurve amplitudes 0.1-0.4 mag.This
imposes a bias on the derived size and shape distributions of the population
that must be properly accounted for.
|
[{'version': 'v1', 'created': 'Thu, 20 May 2021 17:34:49 GMT'}]
|
2021-05-21
|
[array(['Navarro-Meza', 'Samuel', ''], dtype=object)
array(['Aadland', 'Erin', ''], dtype=object)
array(['Trilling', 'David', ''], dtype=object)]
|
17,407 |
1710.05696
|
Maxime Bellouvet
|
Maxime Bellouvet, Caroline Busquet, Jinyi Zhang, Philippe Lalanne,
Philippe Bouyer and Simon Bernon
|
Doubly-dressed states for near-field trapping and subwavelength lattice
structuration
|
16 pages, 7 figures
|
Phys. Rev. A 98, 023429 (2018)
|
10.1103/PhysRevA.98.023429
| null |
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a scheme to tailor nanostructured trapping potentials for
ultracold atoms. Our trapping scheme combines an engineered extension of
repulsive optical dipole forces at short distances and attractive
Casimir-Polder forces at long distances between an atom and a nanostructured
surface. This extended dipole force takes advantage of excited-state dressing
by plasmonically-enhanced intensity to doubly dress the ground state and create
a strongly repulsive potential with spatially tunable characteristics. In this
work, we show that, under realistic experimental conditions, this method can be
used to trap Rubidium atoms close to surfaces (tens of nanometers) or to
realize nanostructured lattices with subwavelength periods. The influence of
the various losses and heating rate mechanism in such traps is characterized.
As an example we present a near-field optical lattice with 100nm period and
study the tunability of lattice and trapping depths. Such lattices can enhance
energy scales with interesting perspectives for the simulation of
strongly-correlated physics. Our method can be extended to other atomic species
and to other near-field hybrid systems where a strong atom-light interaction
can be expected.
|
[{'version': 'v1', 'created': 'Mon, 16 Oct 2017 13:58:48 GMT'}
{'version': 'v2', 'created': 'Mon, 12 Mar 2018 13:28:52 GMT'}]
|
2018-09-12
|
[array(['Bellouvet', 'Maxime', ''], dtype=object)
array(['Busquet', 'Caroline', ''], dtype=object)
array(['Zhang', 'Jinyi', ''], dtype=object)
array(['Lalanne', 'Philippe', ''], dtype=object)
array(['Bouyer', 'Philippe', ''], dtype=object)
array(['Bernon', 'Simon', ''], dtype=object)]
|
17,408 |
1410.5146
|
Pavel Timonin
|
P.N. Timonin, G.Y. Chitov
|
Hidden percolation transition in kinetic replication process
|
21 pages, 12 figures, revised version, to appear in J.Phys.A
|
J. Phys. A: Math. Theor. 48 (2015) 135003
|
10.1088/1751-8113/48/13/135003
| null |
cond-mat.stat-mech
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The one-dimensional kinetic contact process with parallel update is
introduced and studied by the mean-field approximation and Monte Carlo (MC)
simulations. Contrary to a more conventional scenario with single active phase
for 1d models with Ising-like variables, we find two different adjacent active
phases in the parameter space of the proposed model with a second-order
transition between them and a multiphase point where the active and the
absorbing phases meet. While one of the active phases is quite standard with a
smooth average filling of the space-time lattice, the second active phase
demonstrates a very subtle (hidden) percolating order which becomes manifest
only after certain transformation from the original model. We determine the
percolation order parameter for active-active phase transition and discuss such
hidden orders in other low-dimensional systems. Our MC data demonstrate
finite-size critical and near-critical scaling of the order parameter
relaxation for the two phase transitions. We find three independent critical
indices for them and conclude that they both belong to the directed percolation
universality class.
|
[{'version': 'v1', 'created': 'Mon, 20 Oct 2014 03:40:21 GMT'}
{'version': 'v2', 'created': 'Wed, 25 Feb 2015 15:19:50 GMT'}]
|
2015-03-17
|
[array(['Timonin', 'P. N.', ''], dtype=object)
array(['Chitov', 'G. Y.', ''], dtype=object)]
|
17,409 |
1005.5410
|
Pedro Curto-Risso
|
P.L. Curto-Risso, A. Medina, A. Calvo Hern\'andez, L. Guzm\'an-Vargas,
F. Angulo-Brown
|
On cycle-to-cycle heat release variations in a simulated spark ignition
heat engine
| null | null | null | null |
physics.class-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The cycle-by-cycle variations in heat release for a simulated spark-ignited
engine are analyzed within a turbulent combustion model in terms of some basic
parameters: the characteristic length of the unburned eddies entrained within
the flame front, a characteristic turbulent speed, and the location of the
ignition kernel. The evolution of the simulated time series with the fuel-air
equivalence ratio, phi, from lean mixtures to over stoichiometric conditions,
is examined and compared with previous experiments. Fluctuations on the
characteristic length of unburned eddies are found to be essential to simulate
heat release cycle-to-cycle variations and recover experimental results.
Relative to the non-linear analysis of the system, it is remarkable that at
fuel ratios around phi=0.65, embedding and surrogate procedures show that the
dimensionality of the system is small.
|
[{'version': 'v1', 'created': 'Fri, 28 May 2010 22:16:30 GMT'}]
|
2010-06-01
|
[array(['Curto-Risso', 'P. L.', ''], dtype=object)
array(['Medina', 'A.', ''], dtype=object)
array(['Hernández', 'A. Calvo', ''], dtype=object)
array(['Guzmán-Vargas', 'L.', ''], dtype=object)
array(['Angulo-Brown', 'F.', ''], dtype=object)]
|
17,410 |
1605.07206
|
Bekir Baytas
|
Bekir Bayta\c{s} and Sarah Shandera
|
On the space of non-Gaussian fields with single-clock bispectra
|
14 pages, 6 figures
|
Phys. Rev. D 94, 043510 (2016)
|
10.1103/PhysRevD.94.043510
| null |
astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We develop a mathematical construction of non-Gaussian fields whose bispectra
satisfy the single-clock inflation consistency relation. At the same order that
our basis for bispectra recovers the two simplest single clock templates, we
also find a third orthogonal template which has the single clock squeezed
limit, peaks in folded configurations, and has very small coupling in the
equilateral limit. We explore the map between templates and operators in a very
general Lagrangian for single-clock fluctuations and find no significant
overlap between the new template and models in the literature. We comment on
the physical implications of this conclusion. Our findings add support for the
idea that both theory and data driven considerations will be best served if
next generation non-Gaussianity constraints are made in a basis that uses the
degree of coupling between long and short wavelength modes as an organizing
principle.
|
[{'version': 'v1', 'created': 'Mon, 23 May 2016 20:19:17 GMT'}
{'version': 'v2', 'created': 'Wed, 20 Jul 2016 17:51:51 GMT'}]
|
2016-08-17
|
[array(['Baytaş', 'Bekir', ''], dtype=object)
array(['Shandera', 'Sarah', ''], dtype=object)]
|
17,411 |
math-ph/9905025
| null |
C. P. Viazminsky
|
Incompressible Fields in Riemannian Manifolds
|
added references
| null | null | null |
math-ph math.MP
| null |
Incompressible fields are of a special importance in electrodynamics, fluid
mechanics, and quantum mechanics. We shall derive a few expressions for such
fields in a Riemannian manifold, and show how to generate an incompressible
field from an arbitrary set of scalar differentiable functions. The concept of
compressibility removing factors of an arbitrary vector field is introduced and
utilized to obtain from an arbitrary vector field an incompressible one that
has the same vector surfaces as the original field. A general expression for
compressibility removing factors of a vector field is derived. The method is
applied to central fields.
|
[{'version': 'v1', 'created': 'Mon, 31 May 1999 19:13:21 GMT'}
{'version': 'v2', 'created': 'Mon, 19 Jul 1999 02:09:59 GMT'}]
|
2007-05-23
|
[array(['Viazminsky', 'C. P.', ''], dtype=object)]
|
17,412 |
2202.13313
|
Huang Yongdong
|
Yongdong Huang, Yuanzhan Li, Xulong Cao, Siyu Zhang, Shen Cai, Ting
Lu, Jie Wang, Yuqi Liu
|
An Efficient End-to-End 3D Voxel Reconstruction based on Neural
Architecture Search
|
Accepted by ICPR 2022 (oral presentation)
| null | null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using neural networks to represent 3D objects has become popular. However,
many previous works employ neural networks with fixed architecture and size to
represent different 3D objects, which lead to excessive network parameters for
simple objects and limited reconstruction accuracy for complex objects. For
each 3D model, it is desirable to have an end-to-end neural network with as few
parameters as possible to achieve high-fidelity reconstruction. In this paper,
we propose an efficient voxel reconstruction method utilizing neural
architecture search (NAS) and binary classification. Taking the number of
layers, the number of nodes in each layer, and the activation function of each
layer as the search space, a specific network architecture can be obtained
based on reinforcement learning technology. Furthermore, to get rid of the
traditional surface reconstruction algorithms (e.g., marching cube) used after
network inference, we complete the end-to-end network by classifying binary
voxels. Compared to other signed distance field (SDF) prediction or binary
classification networks, our method achieves significantly higher
reconstruction accuracy using fewer network parameters.
|
[{'version': 'v1', 'created': 'Sun, 27 Feb 2022 08:53:43 GMT'}
{'version': 'v2', 'created': 'Tue, 1 Mar 2022 02:51:51 GMT'}
{'version': 'v3', 'created': 'Thu, 4 Aug 2022 14:54:00 GMT'}]
|
2022-08-05
|
[array(['Huang', 'Yongdong', ''], dtype=object)
array(['Li', 'Yuanzhan', ''], dtype=object)
array(['Cao', 'Xulong', ''], dtype=object)
array(['Zhang', 'Siyu', ''], dtype=object)
array(['Cai', 'Shen', ''], dtype=object)
array(['Lu', 'Ting', ''], dtype=object)
array(['Wang', 'Jie', ''], dtype=object)
array(['Liu', 'Yuqi', ''], dtype=object)]
|
17,413 |
1910.07583
|
Andreas Stahlbauer
|
Andreas Stahlbauer
|
Abstract Transducers
| null | null | null | null |
cs.FL cs.PL
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Several abstract machines that operate on symbolic input alphabets have been
proposed in the last decade, for example, symbolic automata or lattice
automata. Applications of these types of automata include software security
analysis and natural language processing. While these models provide means to
describe words over infinite input alphabets, there is no considerable work on
symbolic output (as present in transducers) alphabets, or even abstraction
(widening) thereof. Furthermore, established approaches for transforming, for
example, minimizing or reducing, finite-state machines that produce output on
states or transitions are not applicable. A notion of equivalence of this type
of machines is needed to make statements about whether or not transformations
maintain the semantics. We present abstract transducers as a new form of
finite-state transducers. Both their input alphabet and the output alphabet is
composed of abstract words, where one abstract word represents a set of
concrete words. The mapping between these representations is described by
abstract word domains. By using words instead of single letters, abstract
transducers provide the possibility of lookaheads to decide on state
transitions to conduct. Since both the input symbol and the output symbol on
each transition is an abstract entity, abstraction techniques can be applied
naturally. We apply abstract transducers as the foundation for sharing task
artifacts for reuse in context of program analysis and verification, and
describe task artifacts as abstract words. A task artifact is any entity that
contributes to an analysis task and its solution, for example, candidate
invariants or source code to weave.
|
[{'version': 'v1', 'created': 'Wed, 16 Oct 2019 19:34:55 GMT'}]
|
2019-10-18
|
[array(['Stahlbauer', 'Andreas', ''], dtype=object)]
|
17,414 |
1301.0164
|
Matthew Hedden
|
Matthew Hedden, Chris Herald, Paul Kirk
|
The pillowcase and perturbations of traceless representations of knot
groups
|
61 pages, 20 color figures
|
Geom. Topol. 18 (2014) 211-287
|
10.2140/gt.2014.18.211
| null |
math.GT math.DG math.QA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce explicit holonomy perturbations of the Chern-Simons functional
on a 3-ball containing a pair of unknotted arcs. These perturbations give us a
concrete local method for making the moduli spaces of flat singular SO(3)
connections relevant to Kronheimer and Mrowka's singular instanton knot
homology non-degenerate. The mechanism for this study is a (Lagrangian)
intersection diagram which arises, through restriction of representations, from
a tangle decomposition of a knot. When one of the tangles is trivial, our
perturbations allow us to study isolated intersections of two Lagrangians to
produce minimal generating sets for singular instanton knot homology. The
(symplectic) manifold where this intersection occurs corresponds to the
traceless character variety of the four-punctured 2-sphere, which we identify
with the familiar pillowcase. We investigate the image in this pillowcase of
the traceless representations of tangles obtained by removing a trivial tangle
from 2-bridge knots and torus knots. Using this, we compute the singular
instanton homology of a variety of torus knots. In many cases, our computations
allow us to understand non-trivial differentials in the spectral sequence from
Khovanov homology to singular instanton homology.
|
[{'version': 'v1', 'created': 'Wed, 2 Jan 2013 03:58:25 GMT'}]
|
2014-11-11
|
[array(['Hedden', 'Matthew', ''], dtype=object)
array(['Herald', 'Chris', ''], dtype=object)
array(['Kirk', 'Paul', ''], dtype=object)]
|
17,415 |
hep-th/9206040
| null |
Fernando Martinez-Moras and Eduardo Ramos
|
Higher Dimensional Classical W-Algebras
|
22 pages, Plain TeX, KUL-TF-92/19, US-FT/6-92
|
Commun.Math.Phys. 157 (1993) 573-590
|
10.1007/BF02096883
| null |
hep-th
| null |
Classical $W$-algebras in higher dimensions are constructed. This is achieved
by generalizing the classical Gel'fand-Dickey brackets to the commutative limit
of the ring of classical pseudodifferential operators in arbitrary dimension.
These $W$-algebras are the Poisson structures associated with a higher
dimensional version of the Khokhlov-Zabolotskaya hierarchy (dispersionless
KP-hierarchy). The two dimensional case is worked out explicitly and it is
shown that the role of Diff$S(1)$ is taken by the algebra of generators of
local diffeomorphisms in two dimensions.
|
[{'version': 'v1', 'created': 'Tue, 9 Jun 1992 23:09:12 GMT'}]
|
2009-10-22
|
[array(['Martinez-Moras', 'Fernando', ''], dtype=object)
array(['Ramos', 'Eduardo', ''], dtype=object)]
|
17,416 |
astro-ph/0503462
|
Valentine Wakelam
|
Valentine Wakelam (L3AB), Cecilia Ceccarelli (LAOG), Alain Castets
(L3AB), Bertrand Lefloch (LAOG), Laurent Loinard, Alexandre Faure (LAOG),
Nicola Schneider (L3AB), Jean-Jacques Benayoun (LAOG)
|
Sulphur chemistry and molecular shocks: the case of NGC1333-IRAS2
| null |
Astron.Astrophys. 437 (2005) 149-158
|
10.1051/0004-6361:20042566
| null |
astro-ph
| null |
We present SO and SO2 observations in the region of the low mass protostar
IRAS2/NGC1333. The East-West outflow originating from this source has been
mapped in four transitions of both SO and SO2. In addition, CS observations
published in the literature have been used. We compute the SO, SO2 and CS
column densities and the physical conditions at several positions of the
outflow using LTE and a non-LTE LVG approximations. The SO2/SO and CS/SO
abundance ratios are compared with the theoretical predictions of a chemical
model adapted to the physical conditions in the IRAS2 outflow. The SO2/SO
abundance ratios are constant in the two lobes of the outflow whereas CS/SO is
up to 6 times lower in the shocked gas of the East lobe than in the West one.
The comparison with the chemical model allows us to constrain the age of the
outflow produced by IRAS2 to >5e3yr. We find low densities and temperatures for
the outflow of IRAS2 (< 1e6 cm-3 and >70 K) from SO and SO2 emission probably
because the two molecules trace the cooled entrained material. The East lobe of
the outflow shows denser gas compared to the West lobe. We also discuss some
constraints on the depleted form of sulphur.
|
[{'version': 'v1', 'created': 'Tue, 22 Mar 2005 20:55:13 GMT'}]
|
2007-05-23
|
[array(['Wakelam', 'Valentine', '', 'L3AB'], dtype=object)
array(['Ceccarelli', 'Cecilia', '', 'LAOG'], dtype=object)
array(['Castets', 'Alain', '', 'L3AB'], dtype=object)
array(['Lefloch', 'Bertrand', '', 'LAOG'], dtype=object)
array(['Loinard', 'Laurent', '', 'LAOG'], dtype=object)
array(['Faure', 'Alexandre', '', 'LAOG'], dtype=object)
array(['Schneider', 'Nicola', '', 'L3AB'], dtype=object)
array(['Benayoun', 'Jean-Jacques', '', 'LAOG'], dtype=object)]
|
17,417 |
astro-ph/0505405
|
Elizabeth Barlow
|
E. J. Barlow, A. J. Bird, D. J. Clark, R. Cornelisse, A. J. Dean, A.
B. Hill, L. Moran, V. Sguera, S. E. Shaw, D. R. Willis, F. Capitanio, M. Del
Santo and L. Bassani
|
Detection and analysis of a new INTEGRAL hard X-ray transient, IGR
J17285-2922
|
5 pages, 5 figures, accepted for publication in A&A Letters
| null |
10.1051/0004-6361:200500131
| null |
astro-ph
| null |
We present the transient nature of INTEGRAL source IGR J17285-2922,
identified from a single period of activity during an IBIS/ISGRI Galactic
Centre Deep Exposure in September 2003. The source has a maximum detection
significance of 14 sigma in the 20-100 keV energy range and exhibits a flux of
6.5 mCrab before it moves out of the ISGRI field of view. The source is visible
to at least 150 keV and its spectrum can be fit with a power law slope of
Gamma=2.1+/-0.17; a more physical model could not be fit due to poor
statistics. Detected characteristics are consistent with the source being a
Galactic low-mass X-ray binary harbouring a black hole or neutron star.
|
[{'version': 'v1', 'created': 'Thu, 19 May 2005 13:02:16 GMT'}]
|
2009-11-11
|
[array(['Barlow', 'E. J.', ''], dtype=object)
array(['Bird', 'A. J.', ''], dtype=object)
array(['Clark', 'D. J.', ''], dtype=object)
array(['Cornelisse', 'R.', ''], dtype=object)
array(['Dean', 'A. J.', ''], dtype=object)
array(['Hill', 'A. B.', ''], dtype=object)
array(['Moran', 'L.', ''], dtype=object)
array(['Sguera', 'V.', ''], dtype=object)
array(['Shaw', 'S. E.', ''], dtype=object)
array(['Willis', 'D. R.', ''], dtype=object)
array(['Capitanio', 'F.', ''], dtype=object)
array(['Del Santo', 'M.', ''], dtype=object)
array(['Bassani', 'L.', ''], dtype=object)]
|
17,418 |
1702.04512
|
Martin Vanko
|
M. Va\v{n}ko, G. Torres, L. Hamb\'alek, T. Pribulla, L.A. Buchhave, J.
Budaj, P. Dubovsk\'y, Z. Garai, C. Ginski, K. Grankin, R. Kom\v{z}\'ik, V.
Krushevska, E. Kundra, C. Marka, M. Mugrauer, R. Neuhaeuser, J. Ohlert,
\v{S}. Parimucha, V. Perdelwitz, St. Raetz, S.Yu. Shugarov
|
On the nature of the candidate T-Tauri star V501 Aurigae
|
13 pages, 7 figures. Accepted to MNRAS
| null |
10.1093/mnras/stx407
| null |
astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report new multi-colour photometry and high-resolution spectroscopic
observations of the long-period variable V501 Aur, previously considered to be
a weak-lined T-Tauri star belonging to the Taurus-Auriga star-forming region.
The spectroscopic observations reveal that V501 Aur is a single-lined
spectroscopic binary system with a 68.8-day orbital period, a slightly
eccentric orbit (e ~ 0.03), and a systemic velocity discrepant from the mean of
Taurus-Auriga. The photometry shows quasi-periodic variations on a different,
~55-day timescale that we attribute to rotational modulation by spots. No
eclipses are seen. The visible object is a rapidly rotating (vsini ~ 25 km/s)
early K star, which along with the rotation period implies it must be large (R
> 26.3 Rsun), as suggested also by spectroscopic estimates indicating a low
surface gravity. The parallax from the Gaia mission and other independent
estimates imply a distance much greater than the Taurus-Auriga region,
consistent with the giant interpretation. Taken together, this evidence
together with a re-evaluation of the LiI~$\lambda$6707 and H$\alpha$ lines
shows that V501 Aur is not a T-Tauri star, but is instead a field binary with a
giant primary far behind the Taurus-Auriga star-forming region. The large mass
function from the spectroscopic orbit and a comparison with stellar evolution
models suggest the secondary may be an early-type main-sequence star.
|
[{'version': 'v1', 'created': 'Wed, 15 Feb 2017 09:21:45 GMT'}]
|
2017-04-12
|
[array(['Vaňko', 'M.', ''], dtype=object)
array(['Torres', 'G.', ''], dtype=object)
array(['Hambálek', 'L.', ''], dtype=object)
array(['Pribulla', 'T.', ''], dtype=object)
array(['Buchhave', 'L. A.', ''], dtype=object)
array(['Budaj', 'J.', ''], dtype=object)
array(['Dubovský', 'P.', ''], dtype=object)
array(['Garai', 'Z.', ''], dtype=object)
array(['Ginski', 'C.', ''], dtype=object)
array(['Grankin', 'K.', ''], dtype=object)
array(['Komžík', 'R.', ''], dtype=object)
array(['Krushevska', 'V.', ''], dtype=object)
array(['Kundra', 'E.', ''], dtype=object)
array(['Marka', 'C.', ''], dtype=object)
array(['Mugrauer', 'M.', ''], dtype=object)
array(['Neuhaeuser', 'R.', ''], dtype=object)
array(['Ohlert', 'J.', ''], dtype=object)
array(['Parimucha', 'Š.', ''], dtype=object)
array(['Perdelwitz', 'V.', ''], dtype=object)
array(['Raetz', 'St.', ''], dtype=object)
array(['Shugarov', 'S. Yu.', ''], dtype=object)]
|
17,419 |
2209.10245
|
Pablo Antonio Mart\'inez
|
Pablo Antonio Mart\'inez, Gregorio Bernab\'e, Jose Manuel Garc\'ia
|
POAS: A high-performance scheduling framework for exploiting Accelerator
Level Parallelism
| null | null | null | null |
cs.DC
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
Heterogeneous computing is becoming mainstream in all scopes. This new era in
computer architecture brings a new paradigm called Accelerator Level
Parallelism (ALP). In ALP, accelerators are used concurrently to provide
unprecedented levels of performance and energy efficiency. To reach that, there
are many problems to be solved, one of the most challenging being co-execution.
This paper develops a scheduling framework called POAS, a general method for
providing co-execution to generic applications. Unlike other scheduling
approaches, POAS does not directly schedule applications. Instead, it is a
generic model that transforms any application to make it suitable for
co-execution, so that it can be executed in ALP environments. Our proposal is
composed of four differentiated steps: predict, optimize, adapt and schedule.
During these phases, different modifications are implemented in the application
to make it suitable to be executed in ALP environments. In this work we also
apply our framework to a matrix multiplication case study, outlining the
critical and most important steps to port the application with POAS.
We evaluate our POAS-based implementation for matrix multiplication on a
CPU/GPU/XPU environment using CPU cores, CUDA cores and tensor cores (XPU). Our
experiments prove that co-execution in the studied scenario can benefit from
ALP, yielding speedups of up to 45% with respect to using only one accelerator.
The proven flexibility and potential of POAS make it an excellent candidate to
reach ALP in future computer systems.
|
[{'version': 'v1', 'created': 'Wed, 21 Sep 2022 10:19:09 GMT'}]
|
2022-09-22
|
[array(['Martínez', 'Pablo Antonio', ''], dtype=object)
array(['Bernabé', 'Gregorio', ''], dtype=object)
array(['García', 'Jose Manuel', ''], dtype=object)]
|
17,420 |
1112.4162
|
Agustin Sabio Vera
|
G. Chachamis and A. Sabio Vera
|
The colour octet representation of the non-forward BFKL Green function
|
12 pages, 7 figures
| null |
10.1016/j.physletb.2012.02.036
| null |
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We factorize the infrared divergences of the non-forward BFKL Green function
for a general t-channel projection of the color quantum numbers and study the
properties of the infrared finite remainder in the case of color octet
exchange. The octet Green function is compared with the singlet case for
different values of the momentum transfer. The octet Green function plays an
important role in the calculation of the finite remainder of the two-loop
six-point MHV planar amplitude in N = 4 SYM as it was demonstrated by Bartels,
Lipatov and one of us in http://arXiv.org/abs/arXiv:0802.2065 and
http://arXiv.org/abs/arXiv:0807.0894. A comparison with regularizations
preserving conformal invariance at large momentum transfer is shown.
|
[{'version': 'v1', 'created': 'Sun, 18 Dec 2011 14:35:37 GMT'}]
|
2015-06-03
|
[array(['Chachamis', 'G.', ''], dtype=object)
array(['Vera', 'A. Sabio', ''], dtype=object)]
|
17,421 |
2207.00244
|
Wenjia Zhang
|
Wenjia Zhang, Haoran Xu, Haoyi Niu, Peng Cheng, Ming Li, Heming Zhang,
Guyue Zhou, Xianyuan Zhan
|
Discriminator-Guided Model-Based Offline Imitation Learning
|
This work has been accepted by CoRL 2022
| null | null | null |
cs.LG cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Offline imitation learning (IL) is a powerful method to solve decision-making
problems from expert demonstrations without reward labels. Existing offline IL
methods suffer from severe performance degeneration under limited expert data.
Including a learned dynamics model can potentially improve the state-action
space coverage of expert data, however, it also faces challenging issues like
model approximation/generalization errors and suboptimality of rollout data. In
this paper, we propose the Discriminator-guided Model-based offline Imitation
Learning (DMIL) framework, which introduces a discriminator to simultaneously
distinguish the dynamics correctness and suboptimality of model rollout data
against real expert demonstrations. DMIL adopts a novel
cooperative-yet-adversarial learning strategy, which uses the discriminator to
guide and couple the learning process of the policy and dynamics model,
resulting in improved model performance and robustness. Our framework can also
be extended to the case when demonstrations contain a large proportion of
suboptimal data. Experimental results show that DMIL and its extension achieve
superior performance and robustness compared to state-of-the-art offline IL
methods under small datasets.
|
[{'version': 'v1', 'created': 'Fri, 1 Jul 2022 07:28:18 GMT'}
{'version': 'v2', 'created': 'Tue, 5 Jul 2022 03:18:20 GMT'}
{'version': 'v3', 'created': 'Tue, 10 Jan 2023 08:38:47 GMT'}]
|
2023-01-11
|
[array(['Zhang', 'Wenjia', ''], dtype=object)
array(['Xu', 'Haoran', ''], dtype=object)
array(['Niu', 'Haoyi', ''], dtype=object)
array(['Cheng', 'Peng', ''], dtype=object)
array(['Li', 'Ming', ''], dtype=object)
array(['Zhang', 'Heming', ''], dtype=object)
array(['Zhou', 'Guyue', ''], dtype=object)
array(['Zhan', 'Xianyuan', ''], dtype=object)]
|
17,422 |
1211.2777
|
Costantino Sigismondi
|
Costantino Sigismondi
|
Gerberto e l'Astronomia
|
7 pages, in Italian. ISSN 1123-5586
|
Geografia, trimestrale di ricerca scientifica e di programmazione
regionale, vol. 103-104, p. 66-69 (2003)
| null | null |
physics.hist-ph astro-ph.IM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Gerbert of Aurillac was Pope Sylvester II form 999 to 1003. His history is
presented in order to understand his outstanding contribution in the
establishment of quadrivium sciences (arithmetics, music, geometry and
astronomy) in the curricula studiorum of cathedral schools and therefore of
forthcoming universitates studiorum. Gerbert allowed the first sharing of
arabic scientific scientific culture (e.g. Introducing in his didactic method
the astrolabium, the abacus and the monochord) with Christian world
participating in person to the mini-renaissance of the tenth century.
|
[{'version': 'v1', 'created': 'Mon, 12 Nov 2012 20:41:22 GMT'}]
|
2012-11-13
|
[array(['Sigismondi', 'Costantino', ''], dtype=object)]
|
17,423 |
1512.07214
|
Michael Eads
|
M. Eads
|
New Experiments to Measure the Muon Anomalous Gyromagnetic Moment
|
Proceedings from the FPCP conference in May 2015 in Nagoya, Japan
| null | null | null |
hep-ex physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The magnetic moment is a fundamental property of particles. The measurement
of these magnetic moments and the comparison with the values predicted by the
standard model of particle physics is a way to test our understanding of the
fundamental building blocks of our world. In some cases, such as for the
electron, this comparison has resulted in confirmation of the standard model
with incredible precision. In contrast, the magnetic moment of the muon has
shown a long-standing disagreement in the measured and the predicted value.
There is currently a tantalizing three-standard-deviation difference between
the current best measurement (with a precision of 0.54 ppm) and the
state-of-the-art standard model prediction. This represents one of the very few
experimental hints for physics beyond the standard model. There are currently
two major experimental efforts underway to improve the precision of the muon
magnetic moment measurement. The first is an evolution of the E-821 experiment,
originally located at Brookhaven National Laboratory in the United States. This
is experiment, E-989, is located at Fermilab and will measure the spin
precession rate of positive muons in a 14-m diameter storage ring using decay
positrons. The goal of the experiment is to reduce the current experimental
uncertainty by a factor of three. The experiment is currently being constructed
and aims to start taking data in 2017. An alternative, and very complementary,
experiment is being planned at J-PARC in Japan. This experiment, E-34, will
utilize low energy, ultra-cold muons in a much smaller storage ring. This
experiment aims for a similar precision to the Fermilab experiment and aims to
begin data taking on a similar timescale.
|
[{'version': 'v1', 'created': 'Tue, 22 Dec 2015 19:42:02 GMT'}]
|
2015-12-23
|
[array(['Eads', 'M.', ''], dtype=object)]
|
17,424 |
1708.04846
|
Jun Mei
|
Jun Mei, Yong Jiang, Kewei Tu
|
Maximum A Posteriori Inference in Sum-Product Networks
| null | null | null | null |
cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Sum-product networks (SPNs) are a class of probabilistic graphical models
that allow tractable marginal inference. However, the maximum a posteriori
(MAP) inference in SPNs is NP-hard. We investigate MAP inference in SPNs from
both theoretical and algorithmic perspectives. For the theoretical part, we
reduce general MAP inference to its special case without evidence and hidden
variables; we also show that it is NP-hard to approximate the MAP problem to
$2^{n^\epsilon}$ for fixed $0 \leq \epsilon < 1$, where $n$ is the input size.
For the algorithmic part, we first present an exact MAP solver that runs
reasonably fast and could handle SPNs with up to 1k variables and 150k arcs in
our experiments. We then present a new approximate MAP solver with a good
balance between speed and accuracy, and our comprehensive experiments on
real-world datasets show that it has better overall performance than existing
approximate solvers.
|
[{'version': 'v1', 'created': 'Wed, 16 Aug 2017 11:05:48 GMT'}
{'version': 'v2', 'created': 'Fri, 18 Aug 2017 07:07:01 GMT'}
{'version': 'v3', 'created': 'Mon, 20 Nov 2017 03:08:16 GMT'}]
|
2017-11-21
|
[array(['Mei', 'Jun', ''], dtype=object)
array(['Jiang', 'Yong', ''], dtype=object)
array(['Tu', 'Kewei', ''], dtype=object)]
|
17,425 |
2201.03570
|
Thomas Wilson
|
Thomas G. Wilson, Elisa Goffo, Yann Alibert, Davide Gandolfi, Andrea
Bonfanti, Carina M. Persson, Andrew Collier Cameron, Malcolm Fridlund, Luca
Fossati, Judith Korth, Willy Benz, Adrien Deline, Hans-Gustav Flor\'en,
Pascal Guterman, Vardan Adibekyan, Matthew J. Hooton, Sergio Hoyer, Adrien
Leleu, Alexander James Mustill, S\'ebastien Salmon, S\'ergio G. Sousa, Olga
Suarez, Lyu Abe, Abdelkrim Agabi, Roi Alonso, Guillem Anglada, Joel Asquier,
Tamas B\'arczy, David Barrado y Navascues, Susana C. C. Barros, Wolfgang
Baumjohann, Mathias Beck, Thomas Beck, Nicolas Billot, Xavier Bonfils, Alexis
Brandeker, Christopher Broeg, Edward M. Bryant, Matthew R. Burleigh, Marco
Buttu, Juan Cabrera, S\'ebastien Charnoz, David R. Ciardi, Ryan Cloutier,
William D. Cochran, Karen A. Collins, Knicole D. Col\'on, Nicolas Crouzet,
Szilard Csizmadia, Melvyn B. Davies, Magali Deleuil, Laetitia Delrez, Olivier
Demangeon, Brice-Olivier Demory, Diana Dragomir, Georgina Dransfield, David
Ehrenreich, Anders Erikson, Andrea Fortier, Tianjun Gan, Samuel Gill,
Micha\"el Gillon, Crystal L. Gnilka, Nolan Grieves, Sascha Grziwa, Manuel
G\"udel, Tristan Guillot, Jonas Haldemann, Kevin Heng, Keith Horne, Steve B.
Howell, Kate G. Isaak, Jon M. Jenkins, Eric L. N. Jensen, Laszlo Kiss, Gaia
Lacedelli, Kristine Lam, Jacques Laskar, David W. Latham, Alain Lecavelier
des Etangs, Monika Lendl, Kathryn V. Lester, Alan M. Levine, John Livingston,
Christophe Lovis, Rafael Luque, Demetrio Magrin, Wenceslas Marie-Sainte,
Pierre F. L. Maxted, Andrew W. Mayo, Brian McLean, Marko Mecina, Djamel
M\'ekarnia, Valerio Nascimbeni, Louise D. Nielsen, G\"oran Olofsson, Hugh P.
Osborn, Hannah L. M. Osborne, Roland Ottensamer, Isabella Pagano, Enric
Pall\'e, Gisbert Peter, Giampaolo Piotto, Don Pollacco, Didier Queloz,
Roberto Ragazzoni, Nicola Rando, Heike Rauer, Seth Redfield, Ignasi Ribas,
George R. Ricker, Martin Rieder, Nuno C. Santos, Gaetano Scandariato,
Fran\c{c}ois-Xavier Schmider, Richard P. Schwarz, Nicholas J. Scott, Sara
Seager, Damien S\'egransan, Luisa Maria Serrano, Attila E. Simon, Alexis M.
S. Smith, Manfred Steller, Chris Stockdale, Gyula Szab\'o, Nicolas Thomas,
Eric B. Ting, Amaury H. M. J. Triaud, St\'ephane Udry, Vincent Van Eylen,
Val\'erie Van Grootel, Roland K. Vanderspek, Valentina Viotto, Nicholas
Walton, and Joshua N. Winn
|
A pair of Sub-Neptunes transiting the bright K-dwarf TOI-1064
characterised with CHEOPS
|
30 pages, 24 figures, 6 tables including the Appendix; accepted for
publication in MNRAS
| null |
10.1093/mnras/stab3799
| null |
astro-ph.EP astro-ph.IM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report the discovery and characterisation of a pair of sub-Neptunes
transiting the bright K-dwarf TOI-1064 (TIC 79748331), initially detected in
TESS photometry. To characterise the system, we performed and retrieved CHEOPS,
TESS, and ground-based photometry, HARPS high-resolution spectroscopy, and
Gemini speckle imaging. We characterise the host star and determine $T_{\rm
eff, \star}=4734\pm67$ K, $R_{\star}=0.726\pm0.007$ $R_{\odot}$, and
$M_{\star}=0.748\pm0.032$ $M_{\odot}$. We present a novel detrending method
based on PSF shape-change modelling and demonstrate its suitability to correct
flux variations in CHEOPS data. We confirm the planetary nature of both bodies
and find that TOI-1064 b has an orbital period of $P_{\rm b}=6.44387\pm0.00003$
d, a radius of $R_{\rm b}=2.59\pm0.04$ $R_{\oplus}$, and a mass of $M_{\rm
b}=13.5_{-1.8}^{+1.7}$ $M_{\oplus}$, whilst TOI-1064 c has an orbital period of
$P_{\rm c}=12.22657^{+0.00005}_{-0.00004}$ d, a radius of $R_{\rm
c}=2.65\pm0.04$ $R_{\oplus}$, and a 3$\sigma$ upper mass limit of 8.5 ${\rm
M_{\oplus}}$. From the high-precision photometry we obtain radius uncertainties
of $\sim$1.6%, allowing us to conduct internal structure and atmospheric escape
modelling. TOI-1064 b is one of the densest, well-characterised sub-Neptunes,
with a tenuous atmosphere that can be explained by the loss of a primordial
envelope following migration through the protoplanetary disc. It is likely that
TOI-1064 c has an extended atmosphere due to the tentative low density, however
further RVs are needed to confirm this scenario and the similar radii,
different masses nature of this system. The high-precision data and modelling
of TOI-1064 b are important for planets in this region of mass-radius space,
and it allows us to identify a trend in bulk density-stellar metallicity for
massive sub-Neptunes that may hint at the formation of this population of
planets.
|
[{'version': 'v1', 'created': 'Mon, 10 Jan 2022 19:00:01 GMT'}]
|
2022-01-19
|
[array(['Wilson', 'Thomas G.', ''], dtype=object)
array(['Goffo', 'Elisa', ''], dtype=object)
array(['Alibert', 'Yann', ''], dtype=object)
array(['Gandolfi', 'Davide', ''], dtype=object)
array(['Bonfanti', 'Andrea', ''], dtype=object)
array(['Persson', 'Carina M.', ''], dtype=object)
array(['Cameron', 'Andrew Collier', ''], dtype=object)
array(['Fridlund', 'Malcolm', ''], dtype=object)
array(['Fossati', 'Luca', ''], dtype=object)
array(['Korth', 'Judith', ''], dtype=object)
array(['Benz', 'Willy', ''], dtype=object)
array(['Deline', 'Adrien', ''], dtype=object)
array(['Florén', 'Hans-Gustav', ''], dtype=object)
array(['Guterman', 'Pascal', ''], dtype=object)
array(['Adibekyan', 'Vardan', ''], dtype=object)
array(['Hooton', 'Matthew J.', ''], dtype=object)
array(['Hoyer', 'Sergio', ''], dtype=object)
array(['Leleu', 'Adrien', ''], dtype=object)
array(['Mustill', 'Alexander James', ''], dtype=object)
array(['Salmon', 'Sébastien', ''], dtype=object)
array(['Sousa', 'Sérgio G.', ''], dtype=object)
array(['Suarez', 'Olga', ''], dtype=object)
array(['Abe', 'Lyu', ''], dtype=object)
array(['Agabi', 'Abdelkrim', ''], dtype=object)
array(['Alonso', 'Roi', ''], dtype=object)
array(['Anglada', 'Guillem', ''], dtype=object)
array(['Asquier', 'Joel', ''], dtype=object)
array(['Bárczy', 'Tamas', ''], dtype=object)
array(['Navascues', 'David Barrado y', ''], dtype=object)
array(['Barros', 'Susana C. C.', ''], dtype=object)
array(['Baumjohann', 'Wolfgang', ''], dtype=object)
array(['Beck', 'Mathias', ''], dtype=object)
array(['Beck', 'Thomas', ''], dtype=object)
array(['Billot', 'Nicolas', ''], dtype=object)
array(['Bonfils', 'Xavier', ''], dtype=object)
array(['Brandeker', 'Alexis', ''], dtype=object)
array(['Broeg', 'Christopher', ''], dtype=object)
array(['Bryant', 'Edward M.', ''], dtype=object)
array(['Burleigh', 'Matthew R.', ''], dtype=object)
array(['Buttu', 'Marco', ''], dtype=object)
array(['Cabrera', 'Juan', ''], dtype=object)
array(['Charnoz', 'Sébastien', ''], dtype=object)
array(['Ciardi', 'David R.', ''], dtype=object)
array(['Cloutier', 'Ryan', ''], dtype=object)
array(['Cochran', 'William D.', ''], dtype=object)
array(['Collins', 'Karen A.', ''], dtype=object)
array(['Colón', 'Knicole D.', ''], dtype=object)
array(['Crouzet', 'Nicolas', ''], dtype=object)
array(['Csizmadia', 'Szilard', ''], dtype=object)
array(['Davies', 'Melvyn B.', ''], dtype=object)
array(['Deleuil', 'Magali', ''], dtype=object)
array(['Delrez', 'Laetitia', ''], dtype=object)
array(['Demangeon', 'Olivier', ''], dtype=object)
array(['Demory', 'Brice-Olivier', ''], dtype=object)
array(['Dragomir', 'Diana', ''], dtype=object)
array(['Dransfield', 'Georgina', ''], dtype=object)
array(['Ehrenreich', 'David', ''], dtype=object)
array(['Erikson', 'Anders', ''], dtype=object)
array(['Fortier', 'Andrea', ''], dtype=object)
array(['Gan', 'Tianjun', ''], dtype=object)
array(['Gill', 'Samuel', ''], dtype=object)
array(['Gillon', 'Michaël', ''], dtype=object)
array(['Gnilka', 'Crystal L.', ''], dtype=object)
array(['Grieves', 'Nolan', ''], dtype=object)
array(['Grziwa', 'Sascha', ''], dtype=object)
array(['Güdel', 'Manuel', ''], dtype=object)
array(['Guillot', 'Tristan', ''], dtype=object)
array(['Haldemann', 'Jonas', ''], dtype=object)
array(['Heng', 'Kevin', ''], dtype=object)
array(['Horne', 'Keith', ''], dtype=object)
array(['Howell', 'Steve B.', ''], dtype=object)
array(['Isaak', 'Kate G.', ''], dtype=object)
array(['Jenkins', 'Jon M.', ''], dtype=object)
array(['Jensen', 'Eric L. N.', ''], dtype=object)
array(['Kiss', 'Laszlo', ''], dtype=object)
array(['Lacedelli', 'Gaia', ''], dtype=object)
array(['Lam', 'Kristine', ''], dtype=object)
array(['Laskar', 'Jacques', ''], dtype=object)
array(['Latham', 'David W.', ''], dtype=object)
array(['Etangs', 'Alain Lecavelier des', ''], dtype=object)
array(['Lendl', 'Monika', ''], dtype=object)
array(['Lester', 'Kathryn V.', ''], dtype=object)
array(['Levine', 'Alan M.', ''], dtype=object)
array(['Livingston', 'John', ''], dtype=object)
array(['Lovis', 'Christophe', ''], dtype=object)
array(['Luque', 'Rafael', ''], dtype=object)
array(['Magrin', 'Demetrio', ''], dtype=object)
array(['Marie-Sainte', 'Wenceslas', ''], dtype=object)
array(['Maxted', 'Pierre F. L.', ''], dtype=object)
array(['Mayo', 'Andrew W.', ''], dtype=object)
array(['McLean', 'Brian', ''], dtype=object)
array(['Mecina', 'Marko', ''], dtype=object)
array(['Mékarnia', 'Djamel', ''], dtype=object)
array(['Nascimbeni', 'Valerio', ''], dtype=object)
array(['Nielsen', 'Louise D.', ''], dtype=object)
array(['Olofsson', 'Göran', ''], dtype=object)
array(['Osborn', 'Hugh P.', ''], dtype=object)
array(['Osborne', 'Hannah L. M.', ''], dtype=object)
array(['Ottensamer', 'Roland', ''], dtype=object)
array(['Pagano', 'Isabella', ''], dtype=object)
array(['Pallé', 'Enric', ''], dtype=object)
array(['Peter', 'Gisbert', ''], dtype=object)
array(['Piotto', 'Giampaolo', ''], dtype=object)
array(['Pollacco', 'Don', ''], dtype=object)
array(['Queloz', 'Didier', ''], dtype=object)
array(['Ragazzoni', 'Roberto', ''], dtype=object)
array(['Rando', 'Nicola', ''], dtype=object)
array(['Rauer', 'Heike', ''], dtype=object)
array(['Redfield', 'Seth', ''], dtype=object)
array(['Ribas', 'Ignasi', ''], dtype=object)
array(['Ricker', 'George R.', ''], dtype=object)
array(['Rieder', 'Martin', ''], dtype=object)
array(['Santos', 'Nuno C.', ''], dtype=object)
array(['Scandariato', 'Gaetano', ''], dtype=object)
array(['Schmider', 'François-Xavier', ''], dtype=object)
array(['Schwarz', 'Richard P.', ''], dtype=object)
array(['Scott', 'Nicholas J.', ''], dtype=object)
array(['Seager', 'Sara', ''], dtype=object)
array(['Ségransan', 'Damien', ''], dtype=object)
array(['Serrano', 'Luisa Maria', ''], dtype=object)
array(['Simon', 'Attila E.', ''], dtype=object)
array(['Smith', 'Alexis M. S.', ''], dtype=object)
array(['Steller', 'Manfred', ''], dtype=object)
array(['Stockdale', 'Chris', ''], dtype=object)
array(['Szabó', 'Gyula', ''], dtype=object)
array(['Thomas', 'Nicolas', ''], dtype=object)
array(['Ting', 'Eric B.', ''], dtype=object)
array(['Triaud', 'Amaury H. M. J.', ''], dtype=object)
array(['Udry', 'Stéphane', ''], dtype=object)
array(['Van Eylen', 'Vincent', ''], dtype=object)
array(['Van Grootel', 'Valérie', ''], dtype=object)
array(['Vanderspek', 'Roland K.', ''], dtype=object)
array(['Viotto', 'Valentina', ''], dtype=object)
array(['Walton', 'Nicholas', ''], dtype=object)
array(['Winn', 'Joshua N.', ''], dtype=object)]
|
17,426 |
1402.3314
|
Anca Muscholl
|
Anca Muscholl (LaBRI), Igor Walukiewicz (LaBRI)
|
Distributed synthesis for acyclic architectures
| null | null | null | null |
cs.LO cs.SY
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The distributed synthesis problem is about constructing cor- rect distributed
systems, i.e., systems that satisfy a given specification. We consider a
slightly more general problem of distributed control, where the goal is to
restrict the behavior of a given distributed system in order to satisfy the
specification. Our systems are finite state machines that communicate via
rendez-vous (Zielonka automata). We show decidability of the synthesis problem
for all omega-regular local specifications, under the restriction that the
communication graph of the system is acyclic. This result extends a previous
decidability result for a restricted form of local reachability specifications.
|
[{'version': 'v1', 'created': 'Thu, 13 Feb 2014 21:46:24 GMT'}
{'version': 'v2', 'created': 'Wed, 16 Jul 2014 16:22:26 GMT'}]
|
2014-07-21
|
[array(['Muscholl', 'Anca', '', 'LaBRI'], dtype=object)
array(['Walukiewicz', 'Igor', '', 'LaBRI'], dtype=object)]
|
17,427 |
1302.4503
|
Lucyna Kedziora-Chudczer
|
Lucyna Kedziora-Chudczer, Jeremy Bailey and Jonathan Horner
|
Observations of the D/H ratio in Methane in the atmosphere of Saturn's
moon, Titan - where did the Saturnian system form?
|
12 pages, 4 figures, Accepted for publication in proceedings of the
Australian Space Science Conference 2012
| null | null | null |
astro-ph.EP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The details of the Solar system's formation are still heavily debated.
Questions remain about the formation locations of the giant planets, and the
degree to which volatile material was mixed throughout the proto-planetary
system. One diagnostic which offers great promise in helping to unravel the
history of planet formation is the study of the level of deuteration in various
Solar system bodies. For example, the D/H ratio of methane in the atmosphere of
Titan can be used as a diagnostic of the initial conditions of the solar nebula
within the region of giant planet formation, and can help us to determine where
Titan (and, by extension, the Saturnian system) accreted its volatile material.
The level of Titanian deuteration also has implications for both the sources
and long term evolution of Titan's atmospheric composition. We present the
results of observations taken in the 1.58 microns window using the NIFS
spectrometer on the Gemini telescope, and model our data using the VSTAR
line--by--line transfer model, which yields a D/H ratio for Titan's atmosphere
of 143+/-16) x 10^{-6} [1]. We are currently in the process of modeling the
Gemini high resolution GNIRS spectra using new sets of line parameters derived
for methane in the region between 1.2-1.7 microns [2].
|
[{'version': 'v1', 'created': 'Tue, 19 Feb 2013 01:59:51 GMT'}]
|
2013-02-20
|
[array(['Kedziora-Chudczer', 'Lucyna', ''], dtype=object)
array(['Bailey', 'Jeremy', ''], dtype=object)
array(['Horner', 'Jonathan', ''], dtype=object)]
|
17,428 |
0803.2480
|
Guy Barles
|
Guy Barles (LMPT), Pierre Cardaliaguet (LM), Olivier Ley (LMPT),
Aur\'elien Monteillet (LM)
|
Uniqueness Results for Nonlocal Hamilton-Jacobi Equations
| null |
Journal of Functional Analysis 257, 5 (2009) 1261-1287
|
10.1016/j.jfa.2009.04.014
| null |
math.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We are interested in nonlocal Eikonal Equations describing the evolution of
interfaces moving with a nonlocal, non monotone velocity. For these equations,
only the existence of global-in-time weak solutions is available in some
particular cases. In this paper, we propose a new approach for proving
uniqueness of the solution when the front is expanding. This approach
simplifies and extends existing results for dislocation dynamics. It also
provides the first uniqueness result for a Fitzhugh-Nagumo system. The key
ingredients are some new perimeter estimates for the evolving fronts as well as
some uniform interior cone property for these fronts.
|
[{'version': 'v1', 'created': 'Mon, 17 Mar 2008 16:39:10 GMT'}]
|
2010-02-10
|
[array(['Barles', 'Guy', '', 'LMPT'], dtype=object)
array(['Cardaliaguet', 'Pierre', '', 'LM'], dtype=object)
array(['Ley', 'Olivier', '', 'LMPT'], dtype=object)
array(['Monteillet', 'Aurélien', '', 'LM'], dtype=object)]
|
17,429 |
2207.00477
|
Yang Xing
|
Karan Kheta, Claire Delgove, Ruolin Liu, Adeola Aderogba, Marc-Olivier
Pokam, Muhammed Mehmet Unal, Yang Xing, Weisi Guo
|
Vision-based Conflict Detection within Crowds based on High-Resolution
Human Pose Estimation for Smart and Safe Airport
| null | null | null | null |
cs.CV
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
Future airports are becoming more complex and congested with the increasing
number of travellers. While the airports are more likely to become hotspots for
potential conflicts to break out which can cause serious delays to flights and
several safety issues. An intelligent algorithm which renders security
surveillance more effective in detecting conflicts would bring many benefits to
the passengers in terms of their safety, finance, and travelling efficiency.
This paper details the development of a machine learning model to classify
conflicting behaviour in a crowd. HRNet is used to segment the images and then
two approaches are taken to classify the poses of people in the frame via
multiple classifiers. Among them, it was found that the support vector machine
(SVM) achieved the most performant achieving precision of 94.37%. Where the
model falls short is against ambiguous behaviour such as a hug or losing track
of a subject in the frame. The resulting model has potential for deployment
within an airport if improvements are made to cope with the vast number of
potential passengers in view as well as training against further ambiguous
behaviours which will arise in an airport setting. In turn, will provide the
capability to enhance security surveillance and improve airport safety.
|
[{'version': 'v1', 'created': 'Fri, 1 Jul 2022 14:54:12 GMT'}]
|
2022-07-04
|
[array(['Kheta', 'Karan', ''], dtype=object)
array(['Delgove', 'Claire', ''], dtype=object)
array(['Liu', 'Ruolin', ''], dtype=object)
array(['Aderogba', 'Adeola', ''], dtype=object)
array(['Pokam', 'Marc-Olivier', ''], dtype=object)
array(['Unal', 'Muhammed Mehmet', ''], dtype=object)
array(['Xing', 'Yang', ''], dtype=object)
array(['Guo', 'Weisi', ''], dtype=object)]
|
17,430 |
1310.6210
|
Daniel K\"orner
|
Bjoern H. Wellegehausen, Daniel Koerner and Andreas Wipf
|
Finetuning the continuum limit in low-dimensional supersymmetric
theories
|
7 pages, 12 figures, presented at the 31st International Symposium on
Lattice Field Theory (Lattice 2013), 29 July - 3 August 2013, Mainz, Germany
| null | null | null |
hep-lat hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Supersymmetry is a prominent candidate for physics beyond the standard model.
In order to compute the spectrum of supersymmetric theories, we employ
nonperturbative lattice QFT techniques which due to the discretisation of
spacetime violate supersymmetry at finite lattice spacings. Care has to be
taken then to restore supersymmetry in the continuum limit. We discuss a
discretisation of the supersymmetric Nonlinear O(N) Sigma model in two
dimensions and argue that supersymmetry may be restored by finetuning of a
single parameter. Furthermore, we show preliminary results for the vacuum
physics of N = 2 Super-Yang-Mills theory in three dimensions.
|
[{'version': 'v1', 'created': 'Wed, 23 Oct 2013 12:58:51 GMT'}]
|
2013-10-24
|
[array(['Wellegehausen', 'Bjoern H.', ''], dtype=object)
array(['Koerner', 'Daniel', ''], dtype=object)
array(['Wipf', 'Andreas', ''], dtype=object)]
|
17,431 |
cond-mat/0003157
|
Dirk van der Marel
|
D. van der Marel, A. Tsvetkov, M. Grueninger, D. Dulic, H. J. A.
Molegraaf
|
C-axis optical properties of high Tc cuprates
|
4 pages, LaTeX, espcrc2.sty, 3 figures in encapsulated postscript
format
|
Physica C 341-348, 1531 (2000)
|
10.1016/S0921-4534(00)01324-1
|
GMGd-00.03.1
|
cond-mat.supr-con
| null |
A review is given of the experimental status of the interlayer coupling
energy in the cuprates. A second c-axis plasmon is identified in the double
layer compound Y123 for various dopings. The anomalous transport properties
along the c-direction and in the planar directions are compared to model
calculations based on strongly anisotropic scattering. An excellent description
of the optical data at optimal doping is obtained if an anomalously large
anisotropy of the scattering rate between cold spots and hot spots is assumed.
This raises questions as to the physical meaning of these parameters.
|
[{'version': 'v1', 'created': 'Thu, 9 Mar 2000 17:22:16 GMT'}]
|
2009-10-31
|
[array(['van der Marel', 'D.', ''], dtype=object)
array(['Tsvetkov', 'A.', ''], dtype=object)
array(['Grueninger', 'M.', ''], dtype=object)
array(['Dulic', 'D.', ''], dtype=object)
array(['Molegraaf', 'H. J. A.', ''], dtype=object)]
|
17,432 |
2212.10385
|
Jong Hyun Jung
|
Jong Hyun Jung, Prashanth Srinivasan, Axel Forslund, and Blazej
Grabowski
|
High-accuracy thermodynamic properties to the melting point from ab
initio calculations aided by machine-learning potentials
|
6 figures, supplementary information, typos corrected
|
npj Comput. Mater. 9, 3 (2023)
|
10.1038/s41524-022-00956-8
| null |
cond-mat.mtrl-sci
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
Accurate prediction of thermodynamic properties requires an extremely
accurate representation of the free energy surface. Requirements are twofold --
first, the inclusion of the relevant finite-temperature mechanisms, and second,
a dense volume-temperature grid on which the calculations are performed. A
systematic workflow for such calculations requires computational efficiency and
reliability, and has not been available within an ab initio framework so far.
Here, we elucidate such a framework involving direct upsampling, thermodynamic
integration and machine-learning potentials, allowing us to incorporate, in
particular, the full effect of anharmonic vibrations. The improved methodology
has a five-times speed-up compared to state-of-the-art methods. We calculate
equilibrium thermodynamic properties up to the melting point for bcc Nb,
magnetic fcc Ni, fcc Al and hcp Mg, and find remarkable agreement with
experimental data. Strong impact of anharmonicity is observed specifically for
Nb. The introduced procedure paves the way for the development of ab initio
thermodynamic databases.
|
[{'version': 'v1', 'created': 'Tue, 20 Dec 2022 16:10:02 GMT'}
{'version': 'v2', 'created': 'Mon, 26 Dec 2022 11:20:36 GMT'}]
|
2023-01-11
|
[array(['Jung', 'Jong Hyun', ''], dtype=object)
array(['Srinivasan', 'Prashanth', ''], dtype=object)
array(['Forslund', 'Axel', ''], dtype=object)
array(['Grabowski', 'Blazej', ''], dtype=object)]
|
17,433 |
1104.4828
|
Jonathan Wang
|
Jonathan Wang
|
The moduli stack of $G$-bundles
| null | null | null | null |
math.AG math.RT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we give an expository account of the geometric properties of
the moduli stack of $G$-bundles. For $G$ an algebraic group over a base field
and $X \to S$ a flat, finitely presented, projective morphism of schemes, we
give a complete proof that the moduli stack $Bun_G$ is an algebraic stack
locally of finite presentation over $S$ with schematic, affine diagonal. In the
process, we prove some properties of $BG$ and Hom stacks. We then define a
level structure on $Bun_G$ to provide alternative presentations of
quasi-compact open substacks. Finally, we prove that $Bun_G$ is smooth over $S$
if $G$ is smooth and $X \to S$ is a relative curve.
|
[{'version': 'v1', 'created': 'Tue, 26 Apr 2011 00:34:16 GMT'}]
|
2011-04-27
|
[array(['Wang', 'Jonathan', ''], dtype=object)]
|
17,434 |
1007.2477
|
Ren\'e Hartung
|
Ren\'e Hartung
|
Solving linear equations over finitely generated abelian groups
|
12 pages; draft
| null | null | null |
math.GR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss various methods and their effectiveness for solving linear
equations over finitely generated abelian groups. More precisely, if
$\varphi\colon G\to H$ is a homomorphism of finitely generated abelian groups
and $b\in H$, we discuss various algorithms for checking whether $b\in
\im\varphi$ holds and if so, for computing a pre-image of $b$ in $G$ together
with the kernel of $\varphi$.
|
[{'version': 'v1', 'created': 'Thu, 15 Jul 2010 05:17:01 GMT'}]
|
2010-07-16
|
[array(['Hartung', 'René', ''], dtype=object)]
|
17,435 |
2011.04603
|
\'Angel Gonz\'alez-Prieto
|
\'Angel Gonz\'alez-Prieto, Marina Logares
|
On character varieties of singular manifolds
|
30 pages, 4 figures
| null | null | null |
math.AG math.CT math.RT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we construct a lax monoidal Topological Quantum Field Theory
that computes virtual classes, in the Grothendieck ring of algebraic varieties,
of $G$-representation varieties over manifolds with conic singularities, which
we will call nodefolds. This construction is valid for any algebraic group $G$,
in any dimension and also in the parabolic setting. In particular, this TQFT
allow us to compute the virtual classes of representation varieties over
complex singular planar curves. In addition, in the case $G =
\mathrm{SL}_{2}(k)$, the virtual class of the associated character variety over
a nodal closed orientable surface is computed both in the non-parabolic and in
the parabolic scenarios.
|
[{'version': 'v1', 'created': 'Mon, 9 Nov 2020 17:57:28 GMT'}]
|
2020-11-10
|
[array(['González-Prieto', 'Ángel', ''], dtype=object)
array(['Logares', 'Marina', ''], dtype=object)]
|
17,436 |
1412.3772
|
Alexander Alexandrov
|
Alexander Alexandrov
|
Open intersection numbers, Kontsevich-Penner model and cut-and-join
operators
|
28 pages
|
JHEP 1508 (2015) 028
|
10.1007/JHEP08(2015)028
|
ITEP/TH-40/14
|
hep-th math-ph math.MP nlin.SI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We continue our investigation of the Kontsevich--Penner model, which
describes intersection theory on moduli spaces both for open and closed curves.
In particular, we show how Buryak's residue formula, which connects two
generating functions of intersection numbers, appears in the general context of
matrix models and tau-functions. This allows us to prove that the
Kontsevich--Penner matrix integral indeed describes open intersection numbers.
For arbitrary $N$ we show that the string and dilaton equations completely
specify the solution of the KP hierarchy. We derive a complete family of the
Virasoro and W-constraints, and using these constraints, we construct the
cut-and-join operators. The case $N=1$, corresponding to open intersection
numbers, is particularly interesting: for this case we obtain two different
families of the Virasoro constraints, so that the difference between them
describes the dependence of the tau-function on even times.
|
[{'version': 'v1', 'created': 'Thu, 11 Dec 2014 19:33:34 GMT'}
{'version': 'v2', 'created': 'Sun, 26 Apr 2015 12:47:34 GMT'}
{'version': 'v3', 'created': 'Sun, 6 Sep 2015 16:47:37 GMT'}
{'version': 'v4', 'created': 'Wed, 22 Jun 2016 13:53:38 GMT'}]
|
2016-06-23
|
[array(['Alexandrov', 'Alexander', ''], dtype=object)]
|
17,437 |
1512.07557
|
Sven Bjarke Gudnason
|
Sven Bjarke Gudnason, Muneto Nitta, Shin Sasaki
|
A supersymmetric Skyrme model
|
LaTeX: 21 pages, no figures; V2: published version (minor
corrections)
|
JHEP 1602:074,2016
|
10.1007/JHEP02(2016)074
| null |
hep-th hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Construction of a supersymmetric extension of the Skyrme term was a
long-standing problem because of the auxiliary field problem; that is, the
auxiliary field may propagate and cannot be eliminated, and the problem of
having fourth-order time derivative terms. In this paper, we construct for the
first time a supersymmetric extension of the Skyrme term in four spacetime
dimensions, in the manifestly supersymmetric superfield formalism that does not
suffer from the auxiliary field problem. Chiral symmetry breaking in
supersymmetric theories results not only in Nambu-Goldstone (NG) bosons (pions)
but also in the same number of quasi-NG bosons so that the low-energy theory is
described by an SL(N,C)-valued matrix field instead of SU(N) for NG bosons. The
solution of auxiliary fields is trivial on the canonical branch of the
auxiliary field equation, in which case our model results in a fourth-order
derivative term that is not the Skyrme term. For the case of SL(2,C), we find
explicitly a nontrivial solution to the algebraic auxiliary field equations
that we call a non-canonical branch, which when substituted back into the
Lagrangian gives a Skyrme-like model. If we restrict to a submanifold, where
quasi-NG bosons are turned off, which is tantamount to restricting the Skyrme
field to SU(2), then the fourth-order derivative term reduces exactly to the
standard Skyrme term. Our model is the first example of a nontrivial auxiliary
field solution in a multi-component model.
|
[{'version': 'v1', 'created': 'Wed, 23 Dec 2015 17:48:23 GMT'}
{'version': 'v2', 'created': 'Mon, 15 Feb 2016 10:16:07 GMT'}]
|
2016-03-10
|
[array(['Gudnason', 'Sven Bjarke', ''], dtype=object)
array(['Nitta', 'Muneto', ''], dtype=object)
array(['Sasaki', 'Shin', ''], dtype=object)]
|
17,438 |
2302.00775
|
Aria Khademi
|
Aria Khademi, Michael Hopka, Devesh Upadhyay
|
Model Monitoring and Robustness of In-Use Machine Learning Models:
Quantifying Data Distribution Shifts Using Population Stability Index
| null | null | null | null |
cs.LG
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
Safety goes first. Meeting and maintaining industry safety standards for
robustness of artificial intelligence (AI) and machine learning (ML) models
require continuous monitoring for faults and performance drops. Deep learning
models are widely used in industrial applications, e.g., computer vision, but
the susceptibility of their performance to environment changes (e.g., noise)
\emph{after deployment} on the product, are now well-known. A major challenge
is detecting data distribution shifts that happen, comparing the following:
{\bf (i)} development stage of AI and ML models, i.e., train/validation/test,
to {\bf (ii)} deployment stage on the product (i.e., even after `testing') in
the environment. We focus on a computer vision example related to autonomous
driving and aim at detecting shifts that occur as a result of adding noise to
images. We use the population stability index (PSI) as a measure of presence
and intensity of shift and present results of our empirical experiments showing
a promising potential for the PSI. We further discuss multiple aspects of model
monitoring and robustness that need to be analyzed \emph{simultaneously} to
achieve robustness for industry safety standards. We propose the need for and
the research direction toward \emph{categorizations} of problem classes and
examples where monitoring for robustness is required and present challenges and
pointers for future work from a \emph{practical} perspective.
|
[{'version': 'v1', 'created': 'Wed, 1 Feb 2023 22:06:31 GMT'}]
|
2023-02-03
|
[array(['Khademi', 'Aria', ''], dtype=object)
array(['Hopka', 'Michael', ''], dtype=object)
array(['Upadhyay', 'Devesh', ''], dtype=object)]
|
17,439 |
2108.12410
|
Joan Enrique-Romero
|
Joan Enrique-Romero, Cecilia Ceccarelli, Albert Rimola, Dimitrios
Skouteris, Nadia Balucani, Piero Ugliengo
|
Theoretical computations on the efficiency of acetaldehyde formation on
interstellar icy grains
|
14 pages, 12 figures, 11 tables, accepted in A&A
|
A&A 655, A9 (2021)
|
10.1051/0004-6361/202141531
| null |
astro-ph.GA
|
http://creativecommons.org/licenses/by/4.0/
|
Interstellar grains are known to be important actors in the formation of
interstellar molecules such as H$_2$, water, ammonia, and methanol. It has been
suggested that the so-called interstellar complex organic molecules (iCOMs) are
also formed on the interstellar grain icy surfaces by the combination of
radicals via reactions assumed to have an efficiency equal to unity. In this
work, we aim to investigate the robustness or weakness of this assumption by
considering the case of acetaldehyde (CH$_3$CHO) as a starting study case. In
the literature, it has been postulated that acetaldehyde is formed on the icy
surfaces via the combination of HCO and CH$_3$. Here we report new theoretical
computations on the efficiency of its formation.
To this end, we coupled quantum chemical calculations of the energetics and
kinetics of the reaction CH$_3$ + HCO, which can lead to the formation of
CH$_3$CHO or CO + CH$_4$. Specifically, we combined reaction kinetics computed
with the Rice-Ramsperger-Kassel-Marcus (RRKM) theory (tunneling included)
method with diffusion and desorption competitive channels. We provide the
results of our computations in the format used by astrochemical models to
facilitate their exploitation.
Our new computations indicate that the efficiency of acetaldehyde formation
on the icy surfaces is a complex function of the temperature and, more
importantly, of the assumed diffusion over binding energy ratio $f$ of the
CH$_3$ radical. If the ratio $f$ is $\geq$0.4, the efficiency is equal to unity
in the range where the reaction can occur, namely between 12 and 30 K. However,
if $f$ is smaller, the efficiency dramatically crashes: with $f$=0.3, it is at
most 0.01. In addition, the formation of acetaldehyde is always in competition
with that of CO + CH$_4$.
|
[{'version': 'v1', 'created': 'Fri, 27 Aug 2021 17:35:45 GMT'}]
|
2021-11-03
|
[array(['Enrique-Romero', 'Joan', ''], dtype=object)
array(['Ceccarelli', 'Cecilia', ''], dtype=object)
array(['Rimola', 'Albert', ''], dtype=object)
array(['Skouteris', 'Dimitrios', ''], dtype=object)
array(['Balucani', 'Nadia', ''], dtype=object)
array(['Ugliengo', 'Piero', ''], dtype=object)]
|
17,440 |
0903.0207
|
Fangwen Fu
|
Fangwen Fu, Mihaela van der Schaar
|
A Systematic Framework for Dynamically Optimizing Multi-User Wireless
Video Transmission
|
36 pages, 13 figures
| null | null | null |
cs.MM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we formulate the collaborative multi-user wireless video
transmission problem as a multi-user Markov decision process (MUMDP) by
explicitly considering the users' heterogeneous video traffic characteristics,
time-varying network conditions and the resulting dynamic coupling between the
wireless users. These environment dynamics are often ignored in existing
multi-user video transmission solutions. To comply with the decentralized
nature of wireless networks, we propose to decompose the MUMDP into local MDPs
using Lagrangian relaxation. Unlike in conventional multi-user video
transmission solutions stemming from the network utility maximization
framework, the proposed decomposition enables each wireless user to
individually solve its own dynamic cross-layer optimization (i.e. the local
MDP) and the network coordinator to update the Lagrangian multipliers (i.e.
resource prices) based on not only current, but also future resource needs of
all users, such that the long-term video quality of all users is maximized.
However, solving the MUMDP requires statistical knowledge of the experienced
environment dynamics, which is often unavailable before transmission time. To
overcome this obstacle, we then propose a novel online learning algorithm,
which allows the wireless users to update their policies in multiple states
during one time slot. This is different from conventional learning solutions,
which often update one state per time slot. The proposed learning algorithm can
significantly improve the learning performance, thereby dramatically improving
the video quality experienced by the wireless users over time. Our simulation
results demonstrate the efficiency of the proposed MUMDP framework as compared
to conventional multi-user video transmission solutions.
|
[{'version': 'v1', 'created': 'Mon, 2 Mar 2009 04:49:27 GMT'}]
|
2009-03-03
|
[array(['Fu', 'Fangwen', ''], dtype=object)
array(['van der Schaar', 'Mihaela', ''], dtype=object)]
|
17,441 |
2111.06602
|
Dario Gerace
|
Marco Clementi, Matteo Galli, Liam O'Faolain, Dario Gerace
|
Electromagnetically induced transparency from first-order dynamical
systems
|
13 pages, 7 figures, to appear in Physical Review B
|
Physical Review B 104, 205434 (2021)
|
10.1103/PhysRevB.104.205434
| null |
cond-mat.mes-hall physics.optics
|
http://creativecommons.org/licenses/by/4.0/
|
We show how a strongly driven single-mode oscillator coupled to a first-order
dynamical system gives rise to induced absorption or gain of a weak probe beam,
and associated fast or slow light depending on the detuning conditions. We
derive the analytic solutions to the dynamic equations of motion, showing that
the electromagnetically induced transparency (EIT) like response is a general
phenomenology, potentially occurring in any nonlinear oscillator coupled to
first-order dynamical systems. The resulting group delay (or advance) of the
probe is fundamentally determined by the system damping rate. To illustrate the
practical impact of this general theoretical framework, we quantitatively
assess the observable consequences of either thermo-optic or free-carrier
dispersion effects in conventional semiconductor microcavities in control/probe
experiments, highlighting the generality of this physical mechanism and its
potential for the realization of EIT-like phenomena in integrated and
cost-effective photonic devices.
|
[{'version': 'v1', 'created': 'Fri, 12 Nov 2021 08:33:28 GMT'}]
|
2021-12-06
|
[array(['Clementi', 'Marco', ''], dtype=object)
array(['Galli', 'Matteo', ''], dtype=object)
array(["O'Faolain", 'Liam', ''], dtype=object)
array(['Gerace', 'Dario', ''], dtype=object)]
|
17,442 |
astro-ph/9712155
|
Itziar Aretxaga
|
I. Aretxaga (MPA, Germany), R.J. Terlevich (RGO, UK), B.J. Boyle (AAO,
Australia)
|
The colours of z=2 QSO host galaxies
|
4 pages, Latex, uses paspconf.sty. Also available at
http://www.mpa-garching.mpg.de/~itziar. To appear in in "The Young Universe",
eds. S. D'Odorico et al., A.S.P. Conf. Ser
| null | null | null |
astro-ph
| null |
Three high-redshift (z=2) and high luminosity (M_B < -28 mag for Ho = 50,
qo=0.5) QSOs, two radio-quiet one radio-loud, were imaged in R, I and K bands.
The luminosities, colours and sizes of the hosts overlap with those of actively
star-forming galaxies in the local Universe. These properties give support to
the young host galaxy interpretation of the extended light around QSOs at
high-redshift. The rest-frame UV and UV-optical colours are inconsistent with
the hypothesis of a scattered halo of light from the active nucleus by a simple
optically-thin scattering process produced by dust or hot electrons. If the UV
light is indeed stellar, star formation rates of hundreds of solar masses per
year are implied, an order of magnitude larger than in field galaxies at
similar redshifts and above. This might indicate that the QSO phenomenon is
preferentially accompanied by enhanced galactic activity at high-redshift.
|
[{'version': 'v1', 'created': 'Thu, 11 Dec 1997 17:03:25 GMT'}]
|
2007-05-23
|
[array(['Aretxaga', 'I.', '', 'MPA, Germany'], dtype=object)
array(['Terlevich', 'R. J.', '', 'RGO, UK'], dtype=object)
array(['Boyle', 'B. J.', '', 'AAO,\n Australia'], dtype=object)]
|
17,443 |
1304.2259
|
Zs\'ofia Bogn\'ar
|
M. Paparo, Zs. Bognar, E. Plachy, L. Molnar and P. A. Bradley
|
Multimode pulsation of the ZZ Ceti star GD 154
|
11 pages, 11 figures, accepted for publication in MNRAS
| null |
10.1093/mnras/stt486
| null |
astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the results of a comparative period search on different
time-scales and modelling of the ZZ Ceti (DAV) star GD 154. We determined six
frequencies as normal modes and four rotational doublets around the ones having
the largest amplitude. Two normal modes at 807.62 and 861.56 microHz have never
been reported before. A rigorous test revealed remarkable intrinsic amplitude
variability of frequencies at 839.14 and 861.56 microHz over a 50 d time-scale.
In addition, the multimode pulsation changed to monoperiodic pulsation with an
843.15 microHz dominant frequency at the end of the observing run. The 2.76
microHz average rotational split detected led to a determination of a 2.1 d
rotational period for GD 154. We searched for model solutions with effective
temperatures and log g close to the spectroscopically determined ones. The
best-fitting models resulting from the grid search have M_H between 6.3 x 10^-5
and 6.3 x 10^-7 M*, which means thicker hydrogen layer than the previous
studies suggested. Our investigations show that mode trapping does not
necessarily operate in all of the observed modes and the best candidate for a
trapped mode is at 2484 microHz.
|
[{'version': 'v1', 'created': 'Mon, 8 Apr 2013 16:36:15 GMT'}]
|
2015-06-15
|
[array(['Paparo', 'M.', ''], dtype=object)
array(['Bognar', 'Zs.', ''], dtype=object)
array(['Plachy', 'E.', ''], dtype=object)
array(['Molnar', 'L.', ''], dtype=object)
array(['Bradley', 'P. A.', ''], dtype=object)]
|
17,444 |
2210.15143
|
Nobutaka Ito B.E. M.E. Ph.D. Prof.
|
Nobutaka Ito and Masashi Sugiyama
|
Audio Signal Enhancement with Learning from Positive and Unlabelled Data
|
Accepted to ICASSP2023
| null | null | null |
cs.SD eess.AS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Supervised learning is a mainstream approach to audio signal enhancement (SE)
and requires parallel training data consisting of both noisy signals and the
corresponding clean signals. Such data can only be synthesised and are
mismatched with real data, which can result in poor performance on real data.
Moreover, clean signals may be inaccessible in certain scenarios, which renders
this conventional approach infeasible. Here we explore SE using non-parallel
training data consisting of noisy signals and noise, which can be easily
recorded. We define the positive (P) and the negative (N) classes as signal
inactivity and activity, respectively. We observe that the spectrogram patches
of noise clips can be used as P data and those of noisy signal clips as
unlabelled data. Thus, learning from positive and unlabelled data enables a
convolutional neural network to learn to classify each spectrogram patch as P
or N to enable SE.
|
[{'version': 'v1', 'created': 'Thu, 27 Oct 2022 03:07:47 GMT'}
{'version': 'v2', 'created': 'Sun, 30 Oct 2022 06:30:19 GMT'}
{'version': 'v3', 'created': 'Wed, 26 Apr 2023 15:03:33 GMT'}]
|
2023-04-27
|
[array(['Ito', 'Nobutaka', ''], dtype=object)
array(['Sugiyama', 'Masashi', ''], dtype=object)]
|
17,445 |
1408.1327
|
Vishvendra Singh Poonia
|
Vishvendra Singh Poonia, Dipankar Saha, and Swaroop Ganguly
|
State Transitions and Decoherence in the Avian Compass
|
6 pages, 6 figures
| null | null | null |
physics.bio-ph q-bio.BM quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The radical pair model has been successful in explaining behavioral
characteristics of the geomagnetic compass believed to underlie the navigation
capability of certain avian species. In this study, the spin dynamics of the
radical pair model and decoherence therein are interpreted from a microscopic
state transition point of view. This helps to elucidate the interplay between
the hyperfine and Zeeman interactions that enables the avian compass, and the
distinctive effects of nuclear and environmental decoherence on it. Using a
quantum information theoretic quantifier of coherence, we find that nuclear
decoherence induces new structure in the spin dynamics without materially
affecting the compass action; environmental decoherence, on the other hand,
completely disrupts it.
|
[{'version': 'v1', 'created': 'Sat, 2 Aug 2014 10:57:27 GMT'}
{'version': 'v2', 'created': 'Wed, 28 Jan 2015 07:20:20 GMT'}]
|
2015-01-29
|
[array(['Poonia', 'Vishvendra Singh', ''], dtype=object)
array(['Saha', 'Dipankar', ''], dtype=object)
array(['Ganguly', 'Swaroop', ''], dtype=object)]
|
17,446 |
1805.10972
|
XiaoHai Liu
|
Mao-Jun Yan, Xiao-Hai Liu, Sergi Gonz\`alez-Sol\'is, Feng-Kun Guo,
Christoph Hanhart, Ulf-G. Mei{\ss}ner, Bing-Song Zou
|
New spectrum of negative-parity doubly charmed baryons: Possibility of
two quasistable states
|
6 pages, 3 figures; accepted for publication as a Rapid Communication
in Physical Review D
|
Phys. Rev. D 98, 091502 (2018)
|
10.1103/PhysRevD.98.091502
| null |
hep-ph hep-ex hep-lat nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The discovery of $\Xi_{cc}^{++}$ by the LHCb Collaboration triggers
predictions of more doubly charmed baryons. By taking into account both the
$P$-wave excitations between the two charm quarks and the scattering of light
pseudoscalar mesons off the ground state doubly charmed baryons, a set of
negative-parity spin-1/2 doubly charmed baryons are predicted already from a
unitarized version of leading order chiral perturbation theory. Moreover,
employing heavy antiquark-diquark symmetry the relevant low-energy constants in
the next-to-leading order are connected with those describing light
pseudoscalar mesons scattering off charmed mesons, which have been well
determined from lattice calculations and experimental data. Our calculations
result in a spectrum richer than that of heavy mesons. We find two very narrow
$J^P=1/2^-$ $\Omega_{cc}^P$, which very likely decay into $\Omega_{cc}\pi^0$
breaking isospin symmetry. In the isospin-1/2 $\Xi_{cc}^P$ sector, three states
are predicted to exist below 4.2~GeV with the lowest one being narrow and the
other two rather broad. We suggest to search for the $\Xi_{cc}^{P}$ states in
the $\Xi_{cc}^{++}\pi^-$ mode. Searching for them and their analogues are
helpful to establish the hadron spectrum.
|
[{'version': 'v1', 'created': 'Mon, 28 May 2018 15:30:17 GMT'}
{'version': 'v2', 'created': 'Thu, 15 Nov 2018 09:39:29 GMT'}]
|
2018-11-28
|
[array(['Yan', 'Mao-Jun', ''], dtype=object)
array(['Liu', 'Xiao-Hai', ''], dtype=object)
array(['Gonzàlez-Solís', 'Sergi', ''], dtype=object)
array(['Guo', 'Feng-Kun', ''], dtype=object)
array(['Hanhart', 'Christoph', ''], dtype=object)
array(['Meißner', 'Ulf-G.', ''], dtype=object)
array(['Zou', 'Bing-Song', ''], dtype=object)]
|
17,447 |
2109.08312
|
ByeongRok Ko
|
S. Ahn, M. J. Lee, A. K. Yi, B. Yeo, B. R. Ko, and Y. K. Semertzidis
|
Fast DAQ system with image rejection for axion dark matter searches
|
14 pages, 8 figures, 3 tables. JINST accepted
| null |
10.1088/1748-0221/17/05/P05025
| null |
physics.ins-det hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A fast data acquisition (DAQ) system for axion dark matter searches utilizing
a microwave resonant cavity, also known as axion haloscope searches, has been
developed with a two-channel digitizer that can sample 16-bit amplitudes at
rates up to 180 MSamples/s. First, we realized a practical DAQ efficiency of
greater than 99% for a single DAQ channel, where the DAQ process includes the
online fast Fourier transforms (FFTs). Using an IQ mixer and two parallel DAQ
channels, we then also implemented a software-based image rejection without
losing the DAQ efficiency. This work extends our continuing effort to improve
the figure of merit in axion haloscope searches, the scanning rate.
|
[{'version': 'v1', 'created': 'Fri, 17 Sep 2021 02:27:48 GMT'}
{'version': 'v2', 'created': 'Mon, 18 Apr 2022 00:42:20 GMT'}]
|
2022-05-25
|
[array(['Ahn', 'S.', ''], dtype=object)
array(['Lee', 'M. J.', ''], dtype=object)
array(['Yi', 'A. K.', ''], dtype=object)
array(['Yeo', 'B.', ''], dtype=object)
array(['Ko', 'B. R.', ''], dtype=object)
array(['Semertzidis', 'Y. K.', ''], dtype=object)]
|
17,448 |
0807.3952
|
Max Tegmark
|
Adrian Liu (MIT), Max Tegmark (MIT), Matias Zaldarriaga (Harvard)
|
Will point sources spoil 21 cm tomography?
|
14 pages, 17 figures, replaced to match accepted MNRAS version
|
Mon. Not. R. Astron. Soc. 394, 1575-1587 (2009)
|
10.1111/j.1365-2966.2009.14426.x
| null |
astro-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
21 cm tomography is emerging as a promising probe of the cosmological dark
ages and the epoch of reionization, as well as a tool for observational
cosmology in general. However, serious sources of foreground contamination must
be subtracted for experimental efforts to be viable. In this paper, we focus on
the removal of unresolved extragalactic point sources with smooth spectra, and
evaluate how the residual foreground contamination after cleaning depends on
instrumental and algorithmic parameters. A crucial but often ignored
complication is that the synthesized beam of an interferometer array shrinks
towards higher frequency, causing complicated frequency structure in each sky
pixel as "frizz" far from the beam center contracts across unresolved radio
sources. We find that current-generation experiments should nonetheless be able
to clean out this points source contamination adequately, and quantify the
instrumental and algorithmic design specifications required to meet this
foreground challenge.
|
[{'version': 'v1', 'created': 'Fri, 25 Jul 2008 17:21:57 GMT'}
{'version': 'v2', 'created': 'Mon, 26 Jan 2009 20:26:40 GMT'}]
|
2009-04-10
|
[array(['Liu', 'Adrian', '', 'MIT'], dtype=object)
array(['Tegmark', 'Max', '', 'MIT'], dtype=object)
array(['Zaldarriaga', 'Matias', '', 'Harvard'], dtype=object)]
|
17,449 |
1710.00669
|
Michael Frewer Ph.D.
|
Michael Frewer, George Khujadze, Holger Foysi
|
Comment on 'Lie symmetry analysis of the Lundgren-Monin-Novikov
equations for multi-point probability density functions of turbulent flow'
|
13 pages; 2 clarifying remarks added as footnotes to Section 3
| null | null | null |
physics.flu-dyn cond-mat.stat-mech math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The recent study by Waclawczyk et al. [J. Phys. A: Math. Theor. 50, 175501
(2017)] possesses three shortcomings: (i) The analysis misses a key aspect of
the LMN equations which makes their Lie-group symmetry results incomplete. In
particular, two essential symmetries will break when including this aspect.
(ii) The statements on the constraints regarding the infinite-dimensional
symmetry groups are misleading. (iii) The particular symmetries originating
solely from the linearity of the LMN hierarchy violate the classical principle
of cause and effect and therefore are unphysical. Within this Comment we
present a detailed proof to this claim and conclude with the note that the new
study by Waclawczyk et al. gives an unrealistic outlook on deriving invariant
symmetry solutions for velocity correlations that arise from intermittent
processes.
|
[{'version': 'v1', 'created': 'Mon, 2 Oct 2017 14:11:13 GMT'}
{'version': 'v2', 'created': 'Tue, 3 Oct 2017 14:27:52 GMT'}
{'version': 'v3', 'created': 'Mon, 2 May 2022 11:41:13 GMT'}]
|
2022-05-03
|
[array(['Frewer', 'Michael', ''], dtype=object)
array(['Khujadze', 'George', ''], dtype=object)
array(['Foysi', 'Holger', ''], dtype=object)]
|
17,450 |
1608.00025
|
Le Hur Karyn
|
Kirill Plekhanov, Guillaume Roux, Karyn Le Hur
|
Floquet Engineering of Haldane Chern Insulators and Chiral bosonic phase
transitions
|
24 pages, 16 figures, minor modifications and references added
|
Phys. Rev. B 95, 045102 (2017)
|
10.1103/PhysRevB.95.045102
| null |
cond-mat.quant-gas cond-mat.str-el quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The realization of synthetic gauge fields has attracted a lot of attention
recently in relation with periodically driven systems and the Floquet theory.
In ultra-cold atom systems in optical lattices and photonic networks, this
allows to simulate exotic phases of matter such as quantum Hall phases,
anomalous quantum Hall phases and analogs of topological insulators. In this
paper, we apply the Floquet theory to engineer anisotropic Haldane models on
the honeycomb lattice and two-leg ladder systems. We show that these
anisotropic Haldane models still possess a topologically non-trivial band
structure associated with chiral edge modes (without the presence of a net unit
flux in a unit cell), then referring to the quantum anomalous Hall effect.
Focusing on (interacting) boson systems in s-wave bands of the lattice, we show
how to engineer through the Floquet theory, a quantum phase transition between
a uniform superfluid and a BEC (Bose-Einstein Condensate) analog of FFLO
(Fulde-Ferrell-Larkin-Ovchinnikov) states, where bosons condense at non-zero
wave-vectors. We perform a Ginzburg-Landau analysis of the quantum phase
transition on the graphene lattice, and compute observables such as chiral
currents and the momentum distribution. The results are supported by exact
diagonalization calculations and compared with those of the isotropic
situation. The validity of high-frequency expansion in the Floquet theory is
also tested using time-dependent simulations for various parameters of the
model. Last, we show that the anisotropic choice for the effective vector
potential allows a bosonization approach in equivalent ladder (strip)
geometries.
|
[{'version': 'v1', 'created': 'Fri, 29 Jul 2016 20:43:06 GMT'}
{'version': 'v2', 'created': 'Sun, 21 Aug 2016 15:11:57 GMT'}]
|
2017-01-11
|
[array(['Plekhanov', 'Kirill', ''], dtype=object)
array(['Roux', 'Guillaume', ''], dtype=object)
array(['Hur', 'Karyn Le', ''], dtype=object)]
|
17,451 |
2209.00361
|
Kazusato Oko
|
Kazusato Oko, Shunta Akiyama, Tomoya Murata, and Taiji Suzuki
|
Versatile Single-Loop Method for Gradient Estimator: First and Second
Order Optimality, and its Application to Federated Learning
| null | null | null | null |
cs.LG math.OC stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
While variance reduction methods have shown great success in solving large
scale optimization problems, many of them suffer from accumulated errors and,
therefore, should periodically require the full gradient computation. In this
paper, we present a single-loop algorithm named SLEDGE (Single-Loop mEthoD for
Gradient Estimator) for finite-sum nonconvex optimization, which does not
require periodic refresh of the gradient estimator but achieves nearly optimal
gradient complexity. Unlike existing methods, SLEDGE has the advantage of
versatility; (i) second-order optimality, (ii) exponential convergence in the
PL region, and (iii) smaller complexity under less heterogeneity of data.
We build an efficient federated learning algorithm by exploiting these
favorable properties. We show the first and second-order optimality of the
output and also provide analysis under PL conditions. When the local budget is
sufficiently large and clients are less (Hessian-)~heterogeneous, the algorithm
requires fewer communication rounds then existing methods such as FedAvg,
SCAFFOLD, and Mime. The superiority of our method is verified in numerical
experiments.
|
[{'version': 'v1', 'created': 'Thu, 1 Sep 2022 11:05:26 GMT'}
{'version': 'v2', 'created': 'Tue, 4 Oct 2022 08:04:10 GMT'}]
|
2022-10-05
|
[array(['Oko', 'Kazusato', ''], dtype=object)
array(['Akiyama', 'Shunta', ''], dtype=object)
array(['Murata', 'Tomoya', ''], dtype=object)
array(['Suzuki', 'Taiji', ''], dtype=object)]
|
17,452 |
2303.15854
|
Emanuele Sobacchi
|
Emanuele Sobacchi, Tsvi Piran, Luca Comisso
|
Ultrafast Variability in AGN Jets: Intermittency and Lighthouse Effect
|
9 pages, accepted for publication in ApJL
| null |
10.3847/2041-8213/acc84d
| null |
astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Gamma-ray flares from Active Galactic Nuclei (AGN) show substantial
variability on ultrafast timescales (i.e. shorter than the light crossing time
of the AGN's supermassive black hole). We propose that ultrafast variability is
a byproduct of the turbulent dissipation of the jet Poynting flux. Due to the
intermittency of the turbulent cascade, the dissipation is concentrated in a
set of reconnecting current sheets. Electrons energised by reconnection have a
strong pitch angle anisotropy, i.e. their velocity is nearly aligned with the
guide magnetic field. Then each current sheet produces a narrow radiation beam,
which dominates the emission from the whole jet when it is directed towards the
observer. The ultrafast variability is set by the light crossing time of a
single current sheet, which is much shorter than the light crossing time of the
whole emission region. The predictions of our model are: (i) The bolometric
luminosity of ultrafast AGN flares is dominated by the inverse Compton (IC)
emission, as the lower energy synchrotron emission is suppressed due to the
pitch angle anisotropy. (ii) If the observed luminosity includes a non-flaring
component, the variations of the synchrotron luminosity have a small amplitude.
(iii) The synchrotron and IC emission are less variable at lower frequencies,
as the cooling time of the radiating particles exceeds the light crossing time
of the current sheet. Simultaneous multiwavelength observations of ultrafast
AGN flares can test these predictions.
|
[{'version': 'v1', 'created': 'Tue, 28 Mar 2023 09:50:51 GMT'}]
|
2023-04-12
|
[array(['Sobacchi', 'Emanuele', ''], dtype=object)
array(['Piran', 'Tsvi', ''], dtype=object)
array(['Comisso', 'Luca', ''], dtype=object)]
|
17,453 |
astro-ph/0104280
|
Mika Juvela
|
M. Juvela, P. Padoan, A Nordlund
|
Cooling Rates of Molecular Clouds Based on Numerical MHD Turbulence and
non-LTE Radiative Transfer
|
AASTeX, 19 pages, 15 figures; final, revised version; accepted to ApJ
| null |
10.1086/323952
| null |
astro-ph
| null |
We have computed line emission cooling rates for the main cooling species in
models of interstellar molecular clouds. The models are based on numerical
simulations of super-sonic magneto-hydrodynamic (MHD) turbulence. Non-LTE
radiative transfer calculations have been performed to properly account for the
complex density and velocity structures in the MHD simulations. Three models
are used. Two of the models are based on MHD simulations with different
magnetic field strength and the third includes the computation of self-gravity
(in the super-Alfvenic regime of turbulence). The density and velocity fields
in the simulations are determined self-consistently by the dynamics of
super-sonic turbulence. The models are intended to represent molecular clouds
with linear size L~6 pc and mean density <n>~300 cm^-3, with the density
exceeding 10^4 cm^-3 in the densest cores. We present 12CO, 13CO, C18O, O2, OI,
CI and H2O cooling rates in isothermal clouds with kinetic temperatures 10-80K.
Analytical approximations are derived for the cooling rates. The inhomogeneity
of the models reduces photon trapping and enhances the cooling in the densest
parts of the clouds. Compared with earlier models the cooling rates are less
affected by optical depth effects and are therefore higher. The main effects
comes, however, from the density variation since cooling efficiency increases
with density. This is very important for the cooling of the clouds as a whole
since most cooling is provided by gas with density above the average.
|
[{'version': 'v1', 'created': 'Tue, 17 Apr 2001 10:11:52 GMT'}
{'version': 'v2', 'created': 'Sun, 26 Aug 2001 15:02:31 GMT'}]
|
2009-11-06
|
[array(['Juvela', 'M.', ''], dtype=object)
array(['Padoan', 'P.', ''], dtype=object)
array(['Nordlund', 'A', ''], dtype=object)]
|
17,454 |
2112.12613
|
John F. Mitchell
|
J.F. Mitchell
|
A Nickelate Renaissance
| null |
Frontiers in Physics 9, 753 (2021)
|
10.3389/fphy.2021.813483
| null |
cond-mat.supr-con cond-mat.str-el
|
http://creativecommons.org/licenses/by/4.0/
|
The 2019 discovery of high temperature superconductivity in layered nickelate
films, Nd$_{1-x}$SrNiO$_2$, has galvanized a community that has been studying
nickelates for more than 30 years both as cuprate analogs and in their own
right. On the surface, infinite layer nickelates, and their multilayer analogs,
should be promising candidates based on our understanding of cuprates: square
planar coordination and a parent d9 configuration that places a single hole in
a dx2-y2 planar orbital makes nickelates seem poised for superconductivity. But
creating crystals and films of sufficient quality of this d9 configuration in
Ni1+ has proven to be a synthetic challenge, only recently overcome. These
crystalline specimens are opening windows that shed new light on the
cuprate-nickelate analogy and revealing nuances that leave the relationship
between cuprates and nickelates very much an area open to debate further study.
This Perspective gives a qualitative, phenomenological account of these newly
discovered superconductors and multilayer members of the infinite layer
nickelate family. The focus is on our current understanding of electronic and
magnetic properties of these materials as well as some future opportunities,
explored from the viewpoint of synthetic challenges and some suggested
developments in materials discovery and growth to make further progress in this
rejuvenated field.
|
[{'version': 'v1', 'created': 'Thu, 23 Dec 2021 14:57:32 GMT'}]
|
2021-12-24
|
[array(['Mitchell', 'J. F.', ''], dtype=object)]
|
17,455 |
1512.08170
|
Bakhbergen Bekbauov E
|
Bakhbergen E. Bekbauov, Aidarkhan Kaltayev, Abdumauvlen Berdyshev
|
A New Mathematical Formulation of the Governing Equations for the
Chemical Compositional Simulation
| null | null | null | null |
physics.flu-dyn
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It is the purpose of this work to develop new approach for chemical
compositional reservoir simulation, which may be regarded as a sequential
method. The development process can be roughly divided into the following two
stages: (1) development of a new mathematical formulation for the sequential
chemical compositional reservoir simulation, (2) implementation of a sequential
solution approach for chemical compositional reservoir simulation based on the
formulation described in this paper. This paper addresses the first stage of
the development process by presenting a new mathematical formulation of the
chemical compositional reservoir flow equations for the sequential simulation.
The newly developed mathematical formulation is extended from the model
formulation used in existing chemical compositional simulators. During the
model development process, it was discovered that the currently used chemical
compositional model estimates the adsorption effect on the transport of a
component reasonably well but it violates the principle of mass conservation.
The energy conservation equation in the currently used chemical compositional
model does not consider any change in the effective pore size caused by
adsorption, which leads to inconsistency between the overall compositional
balance equations and the energy conservation equation by violating
conservation of energy. With these partial differential equations as governing
equations, several simulators have been developed. In this article, we propose
a formulation to model the change in pore volume due to adsorption that
satisfies the conservation laws for mass and energy, and allows applying a
sequential solution approach.
|
[{'version': 'v1', 'created': 'Sun, 27 Dec 2015 05:05:05 GMT'}]
|
2015-12-29
|
[array(['Bekbauov', 'Bakhbergen E.', ''], dtype=object)
array(['Kaltayev', 'Aidarkhan', ''], dtype=object)
array(['Berdyshev', 'Abdumauvlen', ''], dtype=object)]
|
17,456 |
2208.09362
|
Wu Bofeng
|
Bofeng Wu and Chao-Guang Huang
|
The gravitational field outside a spatially compact stationary source in
a generic fourth-order theory of gravity
|
11 pages,accepted by JHEP
| null |
10.1007/JHEP02(2023)206
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
By applying the symmetric and trace-free formalism in terms of the
irreducible Cartesian tensors, the metric for the external gravitational field
of a spatially compact stationary source is provided in $F(X,Y,Z)$ gravity, a
generic fourth-order theory of gravity, where $X:=R$ is Ricci scalar,
$Y:=R_{\mu\nu}R^{\mu\nu}$ is Ricci square, and
$Z:=R_{\mu\nu\rho\sigma}R^{\mu\nu\rho\sigma}$ is Riemann square. A new type of
gauge condition is proposed so that the linearized gravitational field
equations of $F(X,Y,Z)$ gravity are greatly simplified, and then, the
stationary metric in the region exterior to the source is derived. In the
process of applying the result, integrations are performed only over the domain
occupied by the source. The multipole expansion of the metric potential in
$F(X,Y,Z)$ gravity for a spatially compact stationary source is also presented.
In the expansion, the corrections of $F(X,Y,Z)$ gravity to General Relativity
are Yukawa-like ones, dependent on two characteristic lengths. Two additional
sets of mass-type source multipole moments appear in the corrections and the
salient feature characterizing them is that the integrations in their
expressions are always modulated by a common radial factor related to the
source distribution.
|
[{'version': 'v1', 'created': 'Fri, 19 Aug 2022 14:17:55 GMT'}
{'version': 'v2', 'created': 'Thu, 29 Sep 2022 13:33:02 GMT'}
{'version': 'v3', 'created': 'Wed, 15 Feb 2023 01:22:02 GMT'}
{'version': 'v4', 'created': 'Mon, 20 Feb 2023 10:30:18 GMT'}]
|
2023-03-22
|
[array(['Wu', 'Bofeng', ''], dtype=object)
array(['Huang', 'Chao-Guang', ''], dtype=object)]
|
17,457 |
2202.05000
|
Tatjana Chuvilskaya
|
T. V. Chuvilskaya
|
Experimental study of the relative probability of high-spin isomeric
states population in ($\alpha$,n)-reactions
| null | null | null | null |
nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Results of the investigations of the yield of high-spin and low-spin isomers
in reactions $^{41}$K($\alpha $,n)$^{44}$Sc, $^{86}$Sr ($\alpha $,n)$^{89}$Zr,
$^{112}$Sn($\alpha$,n)$^{115}$Te, and $^{134}$Ba($\alpha$,n)$^{137}$Ce in the
energy range of the alpha particles 15 $\div$ 31 MeV based on off-beam
measurements of induced activity of members of the isomeric pair are presented.
The anomalous behavior of the isomeric cross-section ratios for the first of
these reactions is confirmed. Uniquely large isomeric cross-section ratios for
the second and third ones are obtained. The features of the fourth reaction,
which are promising for its application in fundamental research, are revealed.
Quality of the description of this dynamics by popular computer codes is
analyzed.
|
[{'version': 'v1', 'created': 'Thu, 10 Feb 2022 12:57:26 GMT'}]
|
2022-02-11
|
[array(['Chuvilskaya', 'T. V.', ''], dtype=object)]
|
17,458 |
2201.06481
|
Irina Acharova
|
Irina A. Acharova, Margarita E. Sharina, and Egor A. Kazakov
|
Investigation of the Prompt SNe Ia progenitor nature through the
analysis of the chemical composition of globular clusters and circumgalactic
clouds
|
16 pages, 6 figures accepted for publication in Monthly Notices of
the Royal Astronomical Society Main Journal
| null |
10.1093/mnras/stac141
| null |
astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A method is proposed for determining the properties of type Ia supernovae
from short-lived precursors -- Prompt SNIa. This method is based on the
assumption that this subtype of type Ia supernovae exploded into
low-metallicity globular clusters (GCs), and is responsible for the enrichment
of the high-metallicity subgroup of GCs and circumgalactic clouds (CGCs) with
the iron peak elements. We justify that CGCs are the formation places of GCs of
both subgroups. The accuracy of the method depends, first, on the number of
GCs, the spectra of which have been studied in detail; second, on the number of
chemical elements, the abundances of which have been worked out. Only those
elements are of interest for this method that are produced in supernova
explosions and are not produced at the previous stage of the stellar evolution.
Our estimates of nucleosynthesis in low-metallicity supernova GCs are in the
best agreement with the following Prompt SNIa model: Single Degenerate Pure
Deflagration Models of white dwarfs (WDs) burning with masses in the range from
1.30 Msun to 1.31 Msun if carbon explodes in the centre of a WD with a low
central density from 0.5*10^9 g/cm^3 to 10^9 g/cm^3.
|
[{'version': 'v1', 'created': 'Mon, 17 Jan 2022 15:48:04 GMT'}]
|
2022-02-02
|
[array(['Acharova', 'Irina A.', ''], dtype=object)
array(['Sharina', 'Margarita E.', ''], dtype=object)
array(['Kazakov', 'Egor A.', ''], dtype=object)]
|
17,459 |
1706.06558
|
Nirbhay Kumar Behera Dr.
|
Nirbhay Kumar Behera and Min Jung Kweon
|
Constructing probability density function of net-proton multiplicity
distributions using Pearson curve method
|
10 pages, 7 figures, text modified (published version)
|
Eur. Phys. J. A 58, 43 (2022)
|
10.1140/epja/s10050-022-00696-9
| null |
nucl-ex hep-ex hep-ph nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
The probability density functions of proton, anti-proton, and net-proton
multiplicity distributions are constructed from the Beam Energy Scan results of
the STAR experiment using the Pearson curve method. The constructed
distributions of proton and anti-proton are compared with Poisson and Binomial
distributions. The net-proton probability distributions are compared with
Skellam distributions to study the O(4) criticality near the chiral crossover
transition. The $C_{6}/C_{2}$ results estimated from the obtained PDFs are
compared with Skellam and Binomial baselines for the Beam Energy Scan data. The
current study shows some signatures of O(4) criticality, which can be further
investigated by precision measurements of the cumulants and understanding the
contribution of non-critical fluctuations to them. This study also provides a
baseline for the higher-order cumulant measurement in the upcoming RHIC BES II
program and future LHC run.
|
[{'version': 'v1', 'created': 'Tue, 20 Jun 2017 17:28:57 GMT'}
{'version': 'v2', 'created': 'Tue, 4 Jul 2017 04:23:10 GMT'}
{'version': 'v3', 'created': 'Thu, 10 Mar 2022 15:21:53 GMT'}]
|
2022-03-11
|
[array(['Behera', 'Nirbhay Kumar', ''], dtype=object)
array(['Kweon', 'Min Jung', ''], dtype=object)]
|
17,460 |
2010.12417
|
Shuai Shao
|
Shuai Shao and Mengke Wang and Rui Xu and Yan-Jiang Wang and Bao-Di
Liu
|
DLDL: Dynamic Label Dictionary Learning via Hypergraph Regularization
| null | null | null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
For classification tasks, dictionary learning based methods have attracted
lots of attention in recent years. One popular way to achieve this purpose is
to introduce label information to generate a discriminative dictionary to
represent samples. However, compared with traditional dictionary learning, this
category of methods only achieves significant improvements in supervised
learning, and has little positive influence on semi-supervised or unsupervised
learning. To tackle this issue, we propose a Dynamic Label Dictionary Learning
(DLDL) algorithm to generate the soft label matrix for unlabeled data.
Specifically, we employ hypergraph manifold regularization to keep the
relations among original data, transformed data, and soft labels consistent. We
demonstrate the efficiency of the proposed DLDL approach on two remote sensing
datasets.
|
[{'version': 'v1', 'created': 'Fri, 23 Oct 2020 14:07:07 GMT'}]
|
2020-10-26
|
[array(['Shao', 'Shuai', ''], dtype=object)
array(['Wang', 'Mengke', ''], dtype=object)
array(['Xu', 'Rui', ''], dtype=object)
array(['Wang', 'Yan-Jiang', ''], dtype=object)
array(['Liu', 'Bao-Di', ''], dtype=object)]
|
17,461 |
2110.12468
|
Zhi-Hong Deng
|
Zhihong Deng, Zuyue Fu, Lingxiao Wang, Zhuoran Yang, Chenjia Bai,
Zhaoran Wang, Jing Jiang
|
SCORE: Spurious COrrelation REduction for Offline Reinforcement Learning
| null | null | null | null |
cs.LG cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Offline reinforcement learning (RL) aims to learn the optimal policy from a
pre-collected dataset without online interactions. Most of the existing studies
focus on distributional shift caused by out-of-distribution actions. However,
even in-distribution actions can raise serious problems. Since the dataset only
contains limited information about the underlying model, offline RL is
vulnerable to spurious correlations, i.e., the agent tends to prefer actions
that by chance lead to high returns, resulting in a highly suboptimal policy.
To address such a challenge, we propose a practical and theoretically
guaranteed algorithm SCORE that reduces spurious correlations by combing an
uncertainty penalty into policy evaluation. We show that this is consistent
with the pessimism principle studied in theory, and the proposed algorithm
converges to the optimal policy with a sublinear rate under mild assumptions.
By conducting extensive experiments on existing benchmarks, we show that SCORE
not only benefits from a solid theory but also obtains strong empirical results
on a variety of tasks.
|
[{'version': 'v1', 'created': 'Sun, 24 Oct 2021 15:34:03 GMT'}]
|
2021-10-26
|
[array(['Deng', 'Zhihong', ''], dtype=object)
array(['Fu', 'Zuyue', ''], dtype=object)
array(['Wang', 'Lingxiao', ''], dtype=object)
array(['Yang', 'Zhuoran', ''], dtype=object)
array(['Bai', 'Chenjia', ''], dtype=object)
array(['Wang', 'Zhaoran', ''], dtype=object)
array(['Jiang', 'Jing', ''], dtype=object)]
|
17,462 |
2003.07772
|
Grzegorz Pastuszak
|
Grzegorz Pastuszak, Adam Skowyrski and Andrzej Jamio{\l}kowski
|
On maps which preserve semipositivity and quantifier elimination theory
for real numbers
| null | null | null | null |
math-ph math.LO math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Assume that
$\Phi:\mathbb{M}_{n}(\mathbb{C})\rightarrow\mathbb{M}_{n}(\mathbb{C})$ is a
superoperator which preserves hermiticity. We give an algorithm determining
whether $\Phi$ preserves semipositivity (we call $\Phi$ positive in this case).
Our approach to the problem has a model-theoretic nature, namely, we apply
techniques of quantifier elimination theory for real numbers. An approach based
on these techniques seems to be the only one that allows to decide whether an
arbitrary hermiticity-preserving $\Phi$ is positive. Before we go to detailed
analysis of the problem, we argue that quantifier elimination for real numbers
(and also for complex numbers) can play a significant role in quantum
information theory and other areas as well.
|
[{'version': 'v1', 'created': 'Tue, 17 Mar 2020 15:40:16 GMT'}]
|
2020-03-18
|
[array(['Pastuszak', 'Grzegorz', ''], dtype=object)
array(['Skowyrski', 'Adam', ''], dtype=object)
array(['Jamiołkowski', 'Andrzej', ''], dtype=object)]
|
17,463 |
2203.06026
|
Tuomas Kynk\"a\"anniemi
|
Tuomas Kynk\"a\"anniemi, Tero Karras, Miika Aittala, Timo Aila, Jaakko
Lehtinen
|
The Role of ImageNet Classes in Fr\'echet Inception Distance
|
ICLR 2023 camera ready. Code:
https://github.com/kynkaat/role-of-imagenet-classes-in-fid
| null | null | null |
cs.CV cs.AI cs.LG cs.NE stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Fr\'echet Inception Distance (FID) is the primary metric for ranking models
in data-driven generative modeling. While remarkably successful, the metric is
known to sometimes disagree with human judgement. We investigate a root cause
of these discrepancies, and visualize what FID "looks at" in generated images.
We show that the feature space that FID is (typically) computed in is so close
to the ImageNet classifications that aligning the histograms of Top-$N$
classifications between sets of generated and real images can reduce FID
substantially -- without actually improving the quality of results. Thus, we
conclude that FID is prone to intentional or accidental distortions. As a
practical example of an accidental distortion, we discuss a case where an
ImageNet pre-trained FastGAN achieves a FID comparable to StyleGAN2, while
being worse in terms of human evaluation.
|
[{'version': 'v1', 'created': 'Fri, 11 Mar 2022 15:50:06 GMT'}
{'version': 'v2', 'created': 'Wed, 7 Sep 2022 07:29:27 GMT'}
{'version': 'v3', 'created': 'Tue, 14 Feb 2023 12:45:31 GMT'}]
|
2023-02-15
|
[array(['Kynkäänniemi', 'Tuomas', ''], dtype=object)
array(['Karras', 'Tero', ''], dtype=object)
array(['Aittala', 'Miika', ''], dtype=object)
array(['Aila', 'Timo', ''], dtype=object)
array(['Lehtinen', 'Jaakko', ''], dtype=object)]
|
17,464 |
0807.1787
|
Sheng-Miao Wu
|
Sheng-Miao Wu, Ting-Gui Wang and Xiao-Bo Dong
|
Broad reprocessed Balmer emission from warped accretion discs
|
11 pages, 11 figures, accepted for publication in MNRAS
| null |
10.1111/j.1365-2966.2008.13538.x
| null |
astro-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Double peaked broad emission lines in active galactic nuclei are generally
considered to be formed in an accretion disc. In this paper, we compute the
profiles of reprocessing emission lines from a relativistic, warped accretion
disc around a black hole in order to explore the possibility that certain
asymmetries in the double-peaked emission line profile which can not be
explained by a circular Keplerian disc may be induced by disc warping. The disc
warping also provides a solution for the energy budget in the emission line
region because it increases the solid angle of the outer disc portion subtended
to the inner portion of the disc. We adopted a parametrized disc geometry and a
central point-like source of ionizing radiation to capture the main
characteristics of the emission line profile from such discs. We find that the
ratio between the blue and red peaks of the line profiles becoming less than
unity can be naturally predicted by a twisted warped disc, and a third peak can
be produced in some cases. We show that disc warping can reproduce the main
features of multi-peaked line profiles of four active galactic nuclei from the
Sloan Digital Sky Survey.
|
[{'version': 'v1', 'created': 'Fri, 11 Jul 2008 07:41:53 GMT'}]
|
2009-11-13
|
[array(['Wu', 'Sheng-Miao', ''], dtype=object)
array(['Wang', 'Ting-Gui', ''], dtype=object)
array(['Dong', 'Xiao-Bo', ''], dtype=object)]
|
17,465 |
1102.3615
|
Michael Ummels
|
Patricia Bouyer, Nicolas Markey, J\"org Olschewski, Michael Ummels
|
Measuring Permissiveness in Parity Games: Mean-Payoff Parity Games
Revisited
|
30 pages, revised version
| null |
10.1007/978-3-642-24372-1_11
|
LSV-2011-17
|
cs.LO cs.GT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study nondeterministic strategies in parity games with the aim of
computing a most permissive winning strategy. Following earlier work, we
measure permissiveness in terms of the average number/weight of transitions
blocked by the strategy. Using a translation into mean-payoff parity games, we
prove that the problem of computing (the permissiveness of) a most permissive
winning strategy is in NP intersected coNP. Along the way, we provide a new
study of mean-payoff parity games. In particular, we prove that the opponent
player has a memoryless optimal strategy and give a new algorithm for solving
these games.
|
[{'version': 'v1', 'created': 'Thu, 17 Feb 2011 16:08:19 GMT'}
{'version': 'v2', 'created': 'Tue, 28 Jun 2011 10:08:39 GMT'}]
|
2013-01-14
|
[array(['Bouyer', 'Patricia', ''], dtype=object)
array(['Markey', 'Nicolas', ''], dtype=object)
array(['Olschewski', 'Jörg', ''], dtype=object)
array(['Ummels', 'Michael', ''], dtype=object)]
|
17,466 |
1202.1731
|
Ryan Milligan
|
Ryan O. Milligan, Phillip C. Chamberlin, Hugh S. Hudson, Thomas N.
Woods, Mihalis Mathioudakis, Lyndsay Fletcher, Adam F. Kowalski, Francis P.
Keenan
|
Observations of Enhanced EUV Continua During An X-Class Solar Flare
Using SDO/EVE
|
6 pages, 3 figures, 1 table. Accepted to ApJ Letters
| null |
10.1088/2041-8205/748/1/L14
| null |
astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Observations of extreme-ultraviolet (EUV) emission from an X-class solar
flare that occurred on 2011 February 15 at 01:44 UT are presented, obtained
using the EUV Variability Experiment (EVE) onboard the Solar Dynamics
Observatory. The complete EVE spectral range covers the free-bound continua of
H I (Lyman continuum), He I, and He II, with recombination edges at 91.2, 50.4,
and 22.8 nm, respectively. By fitting the wavelength ranges blue-ward of each
recombination edge with an exponential function, lightcurves of each of the
integrated continua were generated over the course of the flare, as well as
emission from the free-free continuum (6.5-37 nm). The He II 30.4 nm and
Lyman-alpha 121.6 nm lines, and soft X-ray (0.1-0.8 nm) emission from GOES are
also included for comparison. Each free-bound continuum was found to have a
rapid rise phase at the flare onset similar to that seen in the 25-50 keV
lightcurves from RHESSI, suggesting that they were formed by recombination with
free electrons in the chromosphere. However, the free-free emission exhibited a
slower rise phase seen also in the soft X-ray emission from GOES, implying a
predominantly coronal origin. By integrating over the entire flare the total
energy emitted via each process was determined. We find that the flare energy
in the EVE spectral range amounts to at most a few per cent of the total flare
energy, but EVE gives us a first comprehensive look at these diagnostically
important continuum components.
|
[{'version': 'v1', 'created': 'Wed, 8 Feb 2012 15:18:15 GMT'}]
|
2015-06-04
|
[array(['Milligan', 'Ryan O.', ''], dtype=object)
array(['Chamberlin', 'Phillip C.', ''], dtype=object)
array(['Hudson', 'Hugh S.', ''], dtype=object)
array(['Woods', 'Thomas N.', ''], dtype=object)
array(['Mathioudakis', 'Mihalis', ''], dtype=object)
array(['Fletcher', 'Lyndsay', ''], dtype=object)
array(['Kowalski', 'Adam F.', ''], dtype=object)
array(['Keenan', 'Francis P.', ''], dtype=object)]
|
17,467 |
hep-th/9112051
| null |
J.M.F. Labastida and P.M. Llatas
|
Topological Matter in Two Dimensions
|
46 pages
|
Nucl.Phys. B379 (1992) 220-258
|
10.1016/0550-3213(92)90596-4
| null |
hep-th
| null |
Topological quantum field theories containing matter fields are constructed
by twisting $N=2$ supersymmetric quantum field theories. It is shown that $N=2$
chiral (antichiral) multiplets lead to topological sigma models while $N=2$
twisted chiral (twisted antichiral) multiplets lead to Landau-Ginzburg type
topological quantum field theories. In addition, topological gravity in two
dimensions is formulated using a gauge principle applied to the topological
algebra which results after the twisting of $N=2$ supersymmetry.
|
[{'version': 'v1', 'created': 'Thu, 19 Dec 1991 14:46:00 GMT'}]
|
2009-10-22
|
[array(['Labastida', 'J. M. F.', ''], dtype=object)
array(['Llatas', 'P. M.', ''], dtype=object)]
|
17,468 |
2006.06666
|
Karan Desai
|
Karan Desai, Justin Johnson
|
VirTex: Learning Visual Representations from Textual Annotations
|
CVPR 2021. [v3: better captioning results on fixing beam search bug]
| null | null | null |
cs.CV cs.CL
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The de-facto approach to many vision tasks is to start from pretrained visual
representations, typically learned via supervised training on ImageNet. Recent
methods have explored unsupervised pretraining to scale to vast quantities of
unlabeled images. In contrast, we aim to learn high-quality visual
representations from fewer images. To this end, we revisit supervised
pretraining, and seek data-efficient alternatives to classification-based
pretraining. We propose VirTex -- a pretraining approach using semantically
dense captions to learn visual representations. We train convolutional networks
from scratch on COCO Captions, and transfer them to downstream recognition
tasks including image classification, object detection, and instance
segmentation. On all tasks, VirTex yields features that match or exceed those
learned on ImageNet -- supervised or unsupervised -- despite using up to ten
times fewer images.
|
[{'version': 'v1', 'created': 'Thu, 11 Jun 2020 17:58:48 GMT'}
{'version': 'v2', 'created': 'Tue, 2 Mar 2021 12:03:24 GMT'}
{'version': 'v3', 'created': 'Sat, 25 Sep 2021 23:45:16 GMT'}]
|
2021-09-28
|
[array(['Desai', 'Karan', ''], dtype=object)
array(['Johnson', 'Justin', ''], dtype=object)]
|
17,469 |
1707.09070
|
Shahram Shahsavari
|
Shahram Shahsavari, Parisa Hassanzadeh, Alexei Ashikhmin, and Elza
Erkip
|
Sectoring in Multi-cell Massive MIMO Systems
| null |
Asilomar Conference on Signals, Systems, and Computers, 2017
|
10.1109/ACSSC.2017.8335510
| null |
cs.IT math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, the downlink of a typical massive MIMO system is studied when
each base station is composed of three antenna arrays with directional antenna
elements serving 120 degrees of the two-dimensional space. A lower bound for
the achievable rate is provided. Furthermore, a power optimization problem is
formulated and as a result, centralized and decentralized power allocation
schemes are proposed. The simulation results reveal that using directional
antennas at base stations along with sectoring can lead to a notable increase
in the achievable rates by increasing the received signal power and decreasing
'pilot contamination' interference in multicell massive MIMO systems. Moreover,
it is shown that using optimized power allocation can increase 0.95-likely rate
in the system significantly.
|
[{'version': 'v1', 'created': 'Thu, 27 Jul 2017 23:07:15 GMT'}]
|
2018-04-27
|
[array(['Shahsavari', 'Shahram', ''], dtype=object)
array(['Hassanzadeh', 'Parisa', ''], dtype=object)
array(['Ashikhmin', 'Alexei', ''], dtype=object)
array(['Erkip', 'Elza', ''], dtype=object)]
|
17,470 |
1812.02676
|
Nam Le
|
Nam Le and Jean-Marc Odobez
|
Theoretical Guarantees of Deep Embedding Losses Under Label Noise
| null | null | null | null |
cs.LG cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Collecting labeled data to train deep neural networks is costly and even
impractical for many tasks. Thus, research effort has been focused in
automatically curated datasets or unsupervised and weakly supervised learning.
The common problem in these directions is learning with unreliable label
information. In this paper, we address the tolerance of deep embedding learning
losses against label noise, i.e. when the observed labels are different from
the true labels. Specifically, we provide the sufficient conditions to achieve
theoretical guarantees for the 2 common loss functions: marginal loss and
triplet loss. From these theoretical results, we can estimate how sampling
strategies and initialization can affect the level of resistance against label
noise. The analysis also helps providing more effective guidelines in
unsupervised and weakly supervised deep embedding learning.
|
[{'version': 'v1', 'created': 'Thu, 6 Dec 2018 17:19:01 GMT'}
{'version': 'v2', 'created': 'Wed, 2 Jan 2019 17:43:16 GMT'}]
|
2019-01-03
|
[array(['Le', 'Nam', ''], dtype=object)
array(['Odobez', 'Jean-Marc', ''], dtype=object)]
|
17,471 |
0907.0032
|
Luis A. Medina
|
Luis A. Medina and Doron Zeilberger
|
An Experimental Mathematics Perspective on the Old, and still Open,
Question of When To Stop?
| null | null | null | null |
math.PR math.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In a recent article in American Scientist, Theodore Hill described a
coin-tossing game whose pay-off is the number of heads over the total number of
throws. Suppose that at a given point during the game you have 5 heads and 3
tails, should you stop and get 5/8, or should you keep playing, hoping to get a
better score? This is still an open problem. In the present article, we explore
different strategies to this game from the Experimental Mathematics
perspective.
|
[{'version': 'v1', 'created': 'Tue, 30 Jun 2009 21:51:15 GMT'}
{'version': 'v2', 'created': 'Fri, 10 Sep 2010 14:41:51 GMT'}]
|
2010-09-13
|
[array(['Medina', 'Luis A.', ''], dtype=object)
array(['Zeilberger', 'Doron', ''], dtype=object)]
|
17,472 |
astro-ph/0002347
|
Ken McClements
|
M. E. Dieckmann, K. G. McClements, S. C. Chapman, R. O. Dendy, L. O'C.
Drury
|
Electron acceleration due to high frequency instabilities at supernova
remnant shocks
|
36 pages, 13 figures
|
Astronomy and Astrophysics 356, 377 (2000)
| null | null |
astro-ph
| null |
Observations of synchrotron radiation across a wide range of wavelengths
provide clear evidence that electrons are accelerated to relativistic energies
in supernova remnants (SNRs). However, a viable mechanism for the
pre-acceleration of such electrons to mildly relativistic energies has not yet
been established. In this paper an electromagnetic particle-in-cell (PIC) code
is used to simulate acceleration of electrons from background energies to tens
of keV at perpendicular collisionless shocks associated with SNRs. Free energy
for electron energization is provided by ions reflected from the shock front,
with speeds greater than the upstream electron thermal speed. The PIC
simulation results contain several new features, including: the acceleration,
rather than heating, of electrons via the Buneman instability; the acceleration
of electrons to speeds exceeding those of the shock-reflected ions producing
the instability; and strong acceleration of electrons perpendicular to the
magnetic field. Electron energization takes place through a variety of resonant
and non-resonant processes, of which the strongest involves stochastic
wave-particle interactions. In SNRs the diffusive shock process could then
supply the final step required for the production of fully relativistic
electrons. The mechanisms identified in this paper thus provide a possible
solution to the electron pre-acceleration problem.
|
[{'version': 'v1', 'created': 'Thu, 17 Feb 2000 14:55:31 GMT'}]
|
2007-05-23
|
[array(['Dieckmann', 'M. E.', ''], dtype=object)
array(['McClements', 'K. G.', ''], dtype=object)
array(['Chapman', 'S. C.', ''], dtype=object)
array(['Dendy', 'R. O.', ''], dtype=object)
array(['Drury', "L. O'C.", ''], dtype=object)]
|
17,473 |
cond-mat/0012099
|
Grzegorz Litak
|
G. Litak, J.F. Annett, B.L. Gyorffy
|
Superconductivity in Disordered Sr2RuO4
|
4 pages, 2 figures, to be publish in "Open Problems in Strongly
Correlated Electron Systemcs" (Ed. S. Sarkar), Kluver Academic Publishers
| null | null |
SUP 2000/2
|
cond-mat.supr-con
| null |
We discuss the influence of disorder on the critical temperature Tc of a
p-wave superconductor. To describe disordered Sr2RuO4 we use the extended
Hubbard model with random site energies treated in the Coherent Potential
Approximation.
|
[{'version': 'v1', 'created': 'Thu, 7 Dec 2000 09:36:49 GMT'}]
|
2007-05-23
|
[array(['Litak', 'G.', ''], dtype=object)
array(['Annett', 'J. F.', ''], dtype=object)
array(['Gyorffy', 'B. L.', ''], dtype=object)]
|
17,474 |
2103.12290
|
Fengyi Yu
|
Fengyi Yu, Yanhong Wei, Qiaodan Hu, Jianguo Li
|
Microstructure evolution under the space-time variational solidification
conditions in a melt pool: A multi-scale simulation study
|
We have modified the influence of the solute segregation on the free
energy and interface energy (30 pages, 14 figures)
| null | null | null |
cond-mat.mtrl-sci
|
http://creativecommons.org/licenses/by/4.0/
|
The properties of welded components are dominated by the microstructure
evolution in the pool, where the solidification conditions are space-time
variational. To represent the variational solidification conditions in the
pool, the multi-scale simulation is carried out in this paper, combining the
microscopic Phase-Field (PF) equations with the macroscopic thermal processes.
Firstly, two different models, the GR model and TF model, are employed to
simulate the single crystal solidification at a local region of the pool.
Results suggest the TF model is more suitable to reflect the variational
conditions than the GR model. Secondly, the single-crystal solidification and
poly-crystal solidification at the whole region of the pool are performed
through the TF model. The results demonstrate the space-time variabilities of
the solidification conditions across the melt pool. Meanwhile, the variational
conditions affect the microstructure evolution significantly, including the
onset of initial instability at the epitaxial growth stage and the directional
evolutions of the converging grain boundaries (GBs) and diverging GBs at the
competitive growth stage. Moreover, the formation of axial grain structures is
observed, which can be regarded as the competition between the grains along the
axial direction and radial direction. This study indicates the necessity of
considering the variational conditions in a pool. Meanwhile, the PF model can
simulate microstructure evolution under the variational conditions accurately,
which has a great potential for investigating solidification dynamics in the
melt pool.
|
[{'version': 'v1', 'created': 'Tue, 23 Mar 2021 03:52:52 GMT'}
{'version': 'v2', 'created': 'Mon, 29 Mar 2021 03:16:26 GMT'}
{'version': 'v3', 'created': 'Wed, 17 Nov 2021 08:55:02 GMT'}
{'version': 'v4', 'created': 'Thu, 18 Nov 2021 03:25:07 GMT'}
{'version': 'v5', 'created': 'Thu, 23 Dec 2021 09:42:56 GMT'}
{'version': 'v6', 'created': 'Tue, 1 Mar 2022 05:06:43 GMT'}
{'version': 'v7', 'created': 'Thu, 15 Sep 2022 09:02:25 GMT'}]
|
2022-09-16
|
[array(['Yu', 'Fengyi', ''], dtype=object)
array(['Wei', 'Yanhong', ''], dtype=object)
array(['Hu', 'Qiaodan', ''], dtype=object)
array(['Li', 'Jianguo', ''], dtype=object)]
|
17,475 |
2003.12504
|
Stefan Metzger
|
Stefan Metzger
|
On a novel approach for modeling liquid crystalline flows
| null |
Communications in Mathematical Sciences 18 (2020), p. 359-378
|
10.4310/CMS.2020.v18.n2.a4
| null |
math.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we derive a new model for the description of liquid
crystalline flows. While microscopic Doi type models suffer from the high
dimensionality of the underlying product space, the more macroscopic
Ericksen--Leslie type models describe only the long time behavior of the flow
and are valid only close to equilibrium. By applying an energetic variational
approach, we derive a new macroscopic model which shall provide an improved
description far from equilibrium. The novelty of our approach lies in the way
the energy is minimized. Distinguishing between the velocities of particles and
fluid allows us to define the energy dissipation not in terms of chemical
potentials but in terms of friction induced by the discrepancies in the
considered velocities. We conclude this publication by establishing the
existence of weak solutions to the newly derived model.
|
[{'version': 'v1', 'created': 'Fri, 27 Mar 2020 16:13:09 GMT'}]
|
2021-03-04
|
[array(['Metzger', 'Stefan', ''], dtype=object)]
|
17,476 |
1604.01171
|
Yohann De Castro
|
Sandrine Dallaporta and Yohann De Castro
|
Sparse Recovery from Extreme Eigenvalues Deviation Inequalities
|
33 pages, 1 figure, final version
| null |
10.1051/ps/2018024
| null |
math.ST cs.IT math.IT math.PR stat.ML stat.TH
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This article provides a new toolbox to derive sparse recovery guarantees from
small deviations on extreme singular values or extreme eigenvalues obtained in
Random Matrix Theory. This work is based on Restricted Isometry Constants
(RICs) which are a pivotal notion in Compressed Sensing and High-Dimensional
Statistics as these constants finely assess how a linear operator is
conditioned on the set of sparse vectors and hence how it performs in SRSR.
While it is an open problem to construct deterministic matrices with apposite
RICs, one can prove that such matrices exist using random matrices models. In
this paper, we show upper bounds on RICs for Gaussian and Rademacher matrices
using state-of-the-art small deviation estimates on their extreme eigenvalues.
This allows us to derive a lower bound on the probability of getting SRSR. One
benefit of this paper is a direct and explicit derivation of upper bounds on
RICs and lower bounds on SRSR from small deviations on the extreme eigenvalues
given by Random Matrix theory.
|
[{'version': 'v1', 'created': 'Tue, 5 Apr 2016 08:37:20 GMT'}
{'version': 'v2', 'created': 'Wed, 1 Mar 2017 10:36:44 GMT'}
{'version': 'v3', 'created': 'Mon, 4 Dec 2017 10:47:46 GMT'}
{'version': 'v4', 'created': 'Wed, 14 Nov 2018 12:34:01 GMT'}]
|
2018-11-15
|
[array(['Dallaporta', 'Sandrine', ''], dtype=object)
array(['De Castro', 'Yohann', ''], dtype=object)]
|
17,477 |
1804.10227
|
Torsten Schaub
|
Pedro Cabalar, Roland Kaminski, Torsten Schaub, Anna Schuhmann
|
Temporal Answer Set Programming on Finite Traces
|
Paper presented at the 34nd International Conference on Logic
Programming (ICLP 2018), Oxford, UK, July 14 to July 17, 2018 15 pages,
LaTeX, 0 PDF figures (arXiv:YYMM.NNNNN)
| null | null | null |
cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we introduce an alternative approach to Temporal Answer Set
Programming that relies on a variation of Temporal Equilibrium Logic (TEL) for
finite traces. This approach allows us to even out the expressiveness of TEL
over infinite traces with the computational capacity of (incremental) Answer
Set Programming (ASP). Also, we argue that finite traces are more natural when
reasoning about action and change. As a result, our approach is readily
implementable via multi-shot ASP systems and benefits from an extension of
ASP's full-fledged input language with temporal operators. This includes future
as well as past operators whose combination offers a rich temporal modeling
language. For computation, we identify the class of temporal logic programs and
prove that it constitutes a normal form for our approach. Finally, we outline
two implementations, a generic one and an extension of clingo.
|
[{'version': 'v1', 'created': 'Thu, 26 Apr 2018 18:22:02 GMT'}]
|
2018-04-30
|
[array(['Cabalar', 'Pedro', ''], dtype=object)
array(['Kaminski', 'Roland', ''], dtype=object)
array(['Schaub', 'Torsten', ''], dtype=object)
array(['Schuhmann', 'Anna', ''], dtype=object)]
|
17,478 |
1101.3832
|
Toshiyuki Sugawa
|
Yong Chan Kim and Toshiyuki Sugawa
|
On power deformations of univalent functions
|
9 pages
| null | null | null |
math.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
For an analytic function $f(z)$ on the unit disk $|z|<1$ with
$f(0)=f'(0)-1=0$ and $f(z)\ne0, 0<|z|<1,$ we consider the power deformation
$f_c(z)=z(f(z)/z)^c$ for a complex number $c.$ We determine those values $c$
for which the operator $f\mapsto f_c$ maps a specified class of univalent
functions into the class of univalent functions. A little surprisingly, we will
see that the set is described by the variability region of the quantity
$zf'(z)/f(z),~|z|<1,$ for the class in most cases which we consider in the
present paper. As an unexpected by-product, we show boundedness of strongly
spirallike functions.
|
[{'version': 'v1', 'created': 'Thu, 20 Jan 2011 07:15:01 GMT'}]
|
2011-01-21
|
[array(['Kim', 'Yong Chan', ''], dtype=object)
array(['Sugawa', 'Toshiyuki', ''], dtype=object)]
|
17,479 |
1109.6397
|
Alexi Morin-Duchesne
|
Alexi Morin-Duchesne
|
A Proof of Selection Rules for Critical Dense Polymers
|
39 pages
| null |
10.1088/1751-8113/44/49/495003
| null |
math-ph cond-mat.stat-mech hep-th math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Among the lattice loop models defined by Pearce, Rasmussen and Zuber (2006),
the model corresponding to critical dense polymers ($\beta = 0$) is the only
one for which an inversion relation for the transfer matrix $D_N(u)$ was found
by Pearce and Rasmussen (2007). From this result, they identified the set of
possible eigenvalues for $D_N(u)$ and gave a conjecture for the degeneracies of
its relevant eigenvalues in the link representation, in the sector with $d$
defects. In this paper, we set out to prove this conjecture, using the
homomorphism of the $TL_N (\beta)$ algebra between the loop model link
representation and that of the XXZ model for $\beta = -(q+q^{-1})$.
|
[{'version': 'v1', 'created': 'Thu, 29 Sep 2011 04:56:01 GMT'}]
|
2015-05-30
|
[array(['Morin-Duchesne', 'Alexi', ''], dtype=object)]
|
17,480 |
1609.05663
|
Mateusz Zelent Mateusz Zelent
|
M. Zelent, N. Tahir, R. Gieniusz, J. W. K{\l}os, T. Wojciechowski, U.
Guzowska, A. Maziewski, J. Ding, A.O. Adeyeye and M. Krawczyk
|
Geometrical complexity of the antidots unit cell effect on the spin wave
excitations spectra
|
22 pages, 10 figures and submitted to Physical Review Letters B
|
Journal of Physics D: Applied Physics, Volume 50, Number 18, April
2017
|
10.1088/1361-6463/aa64ab
| null |
cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We have investigated theoretically (with micromagnetic simulations and plane
wave method) and experimentally (with ferromagnetic resonance and Brillouin
light scattering) three types of antidot lattices (ADLs) based on permalloy
thin films with increased complexity of the unit cell: simple square,
bi-component square and wave-like ADL. We have found that placing a small
additional antidot in the center of the unit cell of the square ADL modify
significantly the spin wave spectrum and its dependence on the orientation of
the in-plane magnetic field. We also check the further changes of spin wave
spectrum resulting from the introduction of air-gaps connecting small and large
antidots. In particular, the presence of small antidots change the dependence
of the frequency of the fundamental mode on the angle of the in-plane applied
magnetic field. The air-gaps strongly discriminates the propagation of spin
waves in two principal direction of ADL lattice, orthogonal to each other. In
spite of these spectral changes, the spatial distribution of the spin wave
amplitude generally preserves some similarities for all three structures. We
also highlighted out the role of defects in the ADL in the observed spectra.
The obtained results can be interesting for the magnonics applications of the
magnonic crystals.
|
[{'version': 'v1', 'created': 'Mon, 19 Sep 2016 10:57:08 GMT'}]
|
2017-08-04
|
[array(['Zelent', 'M.', ''], dtype=object)
array(['Tahir', 'N.', ''], dtype=object)
array(['Gieniusz', 'R.', ''], dtype=object)
array(['Kłos', 'J. W.', ''], dtype=object)
array(['Wojciechowski', 'T.', ''], dtype=object)
array(['Guzowska', 'U.', ''], dtype=object)
array(['Maziewski', 'A.', ''], dtype=object)
array(['Ding', 'J.', ''], dtype=object)
array(['Adeyeye', 'A. O.', ''], dtype=object)
array(['Krawczyk', 'M.', ''], dtype=object)]
|
17,481 |
hep-th/9912158
|
Pezzella
|
R. Marotta (Nordita), F. Pezzella (U. of Naples)
|
Two-Loop $\phi^4$-Diagrams from String Theory
|
28 pages, 12 figures
|
Phys.Rev. D61 (2000) 106006
|
10.1103/PhysRevD.61.106006
|
DSF-T-45/99, NORDITA 1999/78-HE
|
hep-th
| null |
Using the {\em cutting and sewing} procedure we show how to get Feynman
diagrams, up to two-loop order, of $\Phi^{4}$-theory with an internal SU(N)
symmetry group, starting from tachyon amplitudes of the open bosonic string
theory. In a properly defined field theory limit, we easily identify the
corners of the string moduli space reproducing the correctly normalized field
theory amplitudes expressed in the Schwinger parametrization.
|
[{'version': 'v1', 'created': 'Fri, 17 Dec 1999 15:44:52 GMT'}]
|
2009-10-31
|
[array(['Marotta', 'R.', '', 'Nordita'], dtype=object)
array(['Pezzella', 'F.', '', 'U. of Naples'], dtype=object)]
|
17,482 |
2102.05662
|
Nadejda Blagorodnova
|
Nadejda Blagorodnova, Jakub Klencki, Ondrej Pejcha, Paul M. Vreeswijk,
Howard E. Bond, Kevin B. Burdge, Kishalay De, Christoffer Fremling, Robert D.
Gehrz, Jacob E. Jencson, Mansi M. Kasliwal, Thomas Kupfer, Ryan M. Lau, Frank
J. Masci and R. Michael Rich
|
The luminous red nova AT 2018bwo in NGC 45 and its binary yellow
supergiant progenitor
|
21 pages, 16 figures, accepted version for A&A
|
A&A 653, A134 (2021)
|
10.1051/0004-6361/202140525
| null |
astro-ph.SR
|
http://creativecommons.org/licenses/by/4.0/
|
Luminous Red Novae (LRNe) are astrophysical transients associated with the
partial ejection of a binary system's common envelope (CE) shortly before its
merger. Here we present the results of our photometric and spectroscopic
follow-up campaign of AT2018bwo (DLT18x), a LRN discovered in NGC45, and
investigate its progenitor system using binary stellar-evolution models. The
transient reached a peak magnitude of $M_r=-10.97\pm0.11$ and maintained this
brightness during its optical plateau of $t_p = 41\pm5$days. During this phase,
it showed a rather stable photospheric temperature of ~3300K and a luminosity
of ~$10^{40}$erg/s. The photosphere of AT2018bwo at early times appeared larger
and cooler than other similar LRNe, likely due to an extended mass-loss episode
before the merger. Towards the end of the plateau, optical spectra showed a
reddened continuum with strong molecular absorption bands. The reprocessed
emission by the cooling dust was also detected in the mid-infrared bands ~1.5
years after the outburst. Archival Spitzer and Hubble Space Telescope data
taken 10-14 years before the transient event suggest a progenitor star with
$T_{prog}\sim 6500$K, $R_{prog}\sim 100R_{\odot}$ and $L_{prog}\sim
2\times10^4L_{\odot}$, and an upper limit for optically thin warm (1000 K) dust
mass of $M_d<10^{-6}M_{\odot}$. Using stellar binary-evolution models, we
determined the properties of binary systems consistent with the progenitor
parameter space. For AT2018bwo, we infer a primary mass of 12-16 $M_{\odot}$,
which is 9-45% larger than the ~11$M_{\odot}$ obtained using single-star
evolution models. The system, consistent with a yellow-supergiant primary, was
likely in a stable mass-transfer regime with -2.4<log
($\dot{M}/M_{\odot}$/yr)<-1.2 a decade before the main instability occurred.
During the dynamical merger, the system would have ejected 0.15-0.5$M_{\odot}$
with a velocity of ~500 km/s.
|
[{'version': 'v1', 'created': 'Wed, 10 Feb 2021 19:00:00 GMT'}
{'version': 'v2', 'created': 'Thu, 27 Jan 2022 16:13:33 GMT'}]
|
2022-01-28
|
[array(['Blagorodnova', 'Nadejda', ''], dtype=object)
array(['Klencki', 'Jakub', ''], dtype=object)
array(['Pejcha', 'Ondrej', ''], dtype=object)
array(['Vreeswijk', 'Paul M.', ''], dtype=object)
array(['Bond', 'Howard E.', ''], dtype=object)
array(['Burdge', 'Kevin B.', ''], dtype=object)
array(['De', 'Kishalay', ''], dtype=object)
array(['Fremling', 'Christoffer', ''], dtype=object)
array(['Gehrz', 'Robert D.', ''], dtype=object)
array(['Jencson', 'Jacob E.', ''], dtype=object)
array(['Kasliwal', 'Mansi M.', ''], dtype=object)
array(['Kupfer', 'Thomas', ''], dtype=object)
array(['Lau', 'Ryan M.', ''], dtype=object)
array(['Masci', 'Frank J.', ''], dtype=object)
array(['Rich', 'R. Michael', ''], dtype=object)]
|
17,483 |
2112.09080
|
Ryan Daileda
|
Ryan C. Daileda
|
An application of a generalization of Artin's primitive root conjecture
in the theory of monoid rings
|
13 pages, 1 table
| null | null | null |
math.NT
|
http://creativecommons.org/licenses/by/4.0/
|
Using techniques of algebraic and analytic number theory, we resolve a
question on monoid rings posed by Kulosman, et. al., under the assumption of
the Generalized Riemann Hypothesis (GRH). Specifically, we show that under an
appropriate GRH, for any (rational) prime $p$ the set $E(p) = \{ q \text{ prime
} \, | \, X^q - 1 \text{ factors in } \mathbb{F}_p[X;M] \}$, where $M = \langle
2, 3 \rangle = \mathbb{N}_0 \setminus \{ 1 \}$, contains a subset with positive
natural density. In particular $E(p) \ne \varnothing$. This proves that $M$ is
not a so-called ``Matsuda monoid'' of any positive type. For $p = 2, 3$ this
was observed by Kulosman, who provided factorizations of $X^7-1$ and $X^{11} -
1$ in $\mathbb{F}_2[X; M]$ and $\mathbb{F}_3[X;M]$, respectively. Our results
explain and reproduce both of these factorizations, as well.
|
[{'version': 'v1', 'created': 'Thu, 16 Dec 2021 18:04:43 GMT'}
{'version': 'v2', 'created': 'Fri, 17 Dec 2021 21:45:44 GMT'}
{'version': 'v3', 'created': 'Tue, 26 Jul 2022 05:18:05 GMT'}
{'version': 'v4', 'created': 'Thu, 28 Jul 2022 19:29:04 GMT'}
{'version': 'v5', 'created': 'Fri, 12 Aug 2022 15:02:52 GMT'}]
|
2022-08-15
|
[array(['Daileda', 'Ryan C.', ''], dtype=object)]
|
17,484 |
1908.05115
|
Conrad M\"adler
|
Bernd Fritzsche, Bernd Kirstein, Conrad M\"adler
|
Schur analysis of matricial Hausdorff moment sequences
| null | null | null | null |
math.CA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We develop the algebraic instance of an algorithmic approach to the matricial
Hausdorff moment problem on a compact interval $[\alpha,\beta]$ of the real
axis. Our considerations are along the lines of the classical Schur algorithm
and the treatment of the Hamburger moment problem on the real axis by
Nevanlinna. More precisely, a transformation of matrix sequences is
constructed, which transforms Hausdorff moment sequences into Hausdorff moment
sequences reduced by 1 in length. It is shown that this transformation
corresponds essentially to the left shift of the associated sequences of
canonical moments. As an application, we show that a matricial version of the
arcsine distribution can be used to characterize a certain centrality property
of non-negative Hermitian measures on $[\alpha,\beta]$.
|
[{'version': 'v1', 'created': 'Wed, 14 Aug 2019 13:24:54 GMT'}]
|
2019-08-15
|
[array(['Fritzsche', 'Bernd', ''], dtype=object)
array(['Kirstein', 'Bernd', ''], dtype=object)
array(['Mädler', 'Conrad', ''], dtype=object)]
|
17,485 |
2203.00507
|
Sourav Chowdhury Roy
|
Sourav Roy Chowdhury and Maxim Khlopov
|
An eccentric binary blackhole in post-Newtonian theory
| null |
Symmetry, 2022
|
10.3390/sym14030510
| null |
gr-qc
|
http://creativecommons.org/licenses/by/4.0/
|
Gravitational waves radiated during binary black hole coalescence is a
perfect probe for studying the characteristics of strong gravity. Advanced
techniques for creating numerical relativity substitute models for eccentric
binary black hole systems are presumed to become more crucial in existing and
anticipated gravitational wave detectors. The imprint on the observation data
of the gravitational wave emitted by the binary coalescence enhances the two
body system studies. The aim of this study is to present an overview of the
change in characteristics behaviours of hierarchical massive astrophysical
objects merger, which are the data bank of the early universe. We present
results from numerical relativity simulations of equal-mass and unequal mass
nonspinning inspiral binary-black-hole system in the Post Newtonian framework.
We also consider the time evolution of eccentricity for the initial eccentric
system. The eccentric Post Newtonian equations are expanded in the form of
frequency related variable $x = (M \omega)^{2/3}$. The model is restricted to
the (2, 2) spin-weighted spherical harmonic modes. We conclude that for higher
eccentricity as well as mass ratio there exist higher oscillation in orbital
radius and in eccentricity.
|
[{'version': 'v1', 'created': 'Tue, 1 Mar 2022 14:52:47 GMT'}]
|
2022-03-08
|
[array(['Chowdhury', 'Sourav Roy', ''], dtype=object)
array(['Khlopov', 'Maxim', ''], dtype=object)]
|
17,486 |
1106.2094
|
Cristobal Rivas
|
Crist\'obal Rivas
|
Left-orderings on free products of groups
|
13 pages
| null | null | null |
math.GR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that no left-ordering on a free product of (left-orderable) groups is
isolated. In particular, we show that the space of left-orderings of free
product of finitely generated groups is homeomorphic to the Cantor set. With
the same techniques, we also give a new and constructive proof of the fact that
the natural conjugation action of the free group (on two or more generators) on
its space of left-orderings has a dense orbit.
|
[{'version': 'v1', 'created': 'Fri, 10 Jun 2011 15:11:57 GMT'}]
|
2011-06-13
|
[array(['Rivas', 'Cristóbal', ''], dtype=object)]
|
17,487 |
1101.4135
|
Stephane Ouvry
|
Jean Desbois and Stephane Ouvry
|
Algebraic and arithmetic area for $m$ planar Brownian paths
|
8 pages, 2 figures
| null |
10.1088/1742-5468/2011/05/P05024
| null |
math-ph cond-mat.stat-mech math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The leading and next to leading terms of the average arithmetic area $<
S(m)>$ enclosed by $m\to\infty$ independent closed Brownian planar paths, with
a given length $t$ and starting from and ending at the same point, is
calculated. The leading term is found to be $< S(m) > \sim {\pi t\over 2}\ln m$
and the $0$-winding sector arithmetic area inside the $m$ paths is subleading
in the asymptotic regime. A closed form expression for the algebraic area
distribution is also obtained and discussed.
|
[{'version': 'v1', 'created': 'Fri, 21 Jan 2011 14:10:02 GMT'}]
|
2015-05-27
|
[array(['Desbois', 'Jean', ''], dtype=object)
array(['Ouvry', 'Stephane', ''], dtype=object)]
|
17,488 |
hep-ph/9703292
|
Piotr Kielanowski
|
H. Gonz\'alez, S.R. Ju\'arez W., P. Kielanowski and G. L\'opez Castro
|
Quark mixings as a test of a new symmetry of quark Yukawa couplings
|
LaTeX file, 10 pages including 1 table
|
Phys.Lett.B440:94-100,1998
|
10.1016/S0370-2693(98)01077-6
| null |
hep-ph
| null |
Based on the hierarchy exhibited by quarks masses at low energies, we assume
that Yukawa couplings of up and down quarks are related by $Y_u\propto Y_d^2$
at grand unification scales. This ansatz gives rise to a symmetrical CKM matrix
at the grand unification (GU) scale. Using three specific models as
illustrative examples for the evolution down to low energies, we obtain the
entries and asymmetries of the CKM matrix which are in very good agreement with
their measured values. This indicates that the small asymmetry of the CKM
matrix at low energies may be the effect of the renormalization group evolution
only.
|
[{'version': 'v1', 'created': 'Tue, 11 Mar 1997 17:30:43 GMT'}]
|
2008-11-26
|
[array(['González', 'H.', ''], dtype=object)
array(['W.', 'S. R. Juárez', ''], dtype=object)
array(['Kielanowski', 'P.', ''], dtype=object)
array(['Castro', 'G. López', ''], dtype=object)]
|
17,489 |
0907.4334
|
Fabio Ferrari Ruffino
|
Loriano Bonora, Fabio Ferrari Ruffino and Raffaele Savelli
|
Revisiting pinors, spinors and orientability
|
28 pages, no figures
|
Bollettino U. M. I. (9) IV (2012)
| null | null |
math-ph hep-th math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the relations between pin structures on a non-orientable
even-dimensional manifold, with or without boundary, and pin structures on its
orientable double cover, requiring the latter to be invariant under
sheet-exchange. We show that there is not a simple bijection, but that the
natural map induced by pull-back is neither injective nor surjective: we thus
find the conditions to recover a full correspondence. We also show how to
describe such a correspondence using spinors instead of pinors on the double
cover: this is in a certain sense possible, but in a way that contains anyhow
an explicit reference to pinors. We then consider the example of surfaces, with
detailed computations for the real projective plane, the Klein bottle and the
Moebius strip.
|
[{'version': 'v1', 'created': 'Fri, 24 Jul 2009 16:23:54 GMT'}
{'version': 'v2', 'created': 'Tue, 28 Jul 2009 13:16:34 GMT'}
{'version': 'v3', 'created': 'Sat, 17 Dec 2011 15:08:35 GMT'}]
|
2012-04-11
|
[array(['Bonora', 'Loriano', ''], dtype=object)
array(['Ruffino', 'Fabio Ferrari', ''], dtype=object)
array(['Savelli', 'Raffaele', ''], dtype=object)]
|
17,490 |
1809.04082
|
Emily Cunningham
|
Emily C. Cunningham, Alis J. Deason, Constance M. Rockosi, Puragra
Guhathakurta, Zachary G. Jennings, Evan N. Kirby, Elisa Toloba, and Guillermo
Barro
|
HALO7D I: The Line of Sight Velocities of Distant Main Sequence Stars in
the Milky Way Halo
|
25 pages, 21 figures. Submitted to ApJ; comments welcome!
| null |
10.3847/1538-4357/ab16cb
| null |
astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Halo Assembly in Lambda-CDM: Observations in 7 Dimensions (HALO7D)
dataset consists of Keck II/DEIMOS spectroscopy and Hubble Space
Telescope-measured proper motions of Milky Way halo main sequence turnoff stars
in the CANDELS fields. In this paper, we present the spectroscopic component of
this dataset, and discuss target selection, observing strategy, and survey
properties. We present a new method of measuring line-of-sight (LOS) velocities
by combining multiple spectroscopic observations of a given star, utilizing
Bayesian hierarchical modeling. We present the LOS velocity distributions of
the four HALO7D fields, and estimate their means and dispersions. All of the
LOS distributions are dominated by the "hot halo": none of our fields are
dominated by substructure that is kinematically cold in the LOS velocity
component. Our estimates of the LOS velocity dispersions are consistent across
the different fields, and these estimates are consistent with studies using
other types of tracers. To complement our observations, we perform mock HALO7D
surveys using the synthetic survey software Galaxia to "observe'" the Bullock &
Johnston (2005) accreted stellar halos. Based on these simulated datasets, the
consistent LOS velocity distributions across the four HALO7D fields indicates
that the HALO7D sample is dominated by stars from the same massive (or few
relatively massive) accretion event(s).
|
[{'version': 'v1', 'created': 'Tue, 11 Sep 2018 18:00:03 GMT'}]
|
2019-05-15
|
[array(['Cunningham', 'Emily C.', ''], dtype=object)
array(['Deason', 'Alis J.', ''], dtype=object)
array(['Rockosi', 'Constance M.', ''], dtype=object)
array(['Guhathakurta', 'Puragra', ''], dtype=object)
array(['Jennings', 'Zachary G.', ''], dtype=object)
array(['Kirby', 'Evan N.', ''], dtype=object)
array(['Toloba', 'Elisa', ''], dtype=object)
array(['Barro', 'Guillermo', ''], dtype=object)]
|
17,491 |
1912.11466
|
Mohammad Bhuiyan
|
Mohammad Alfrad Nobel Bhuiyan, Michael J Wathen, M Bhaskara Rao
|
Power Comparisons in 2x2 Contingency Tables: Odds Ratio versus Pearson
Correlation versus Canonical Correlation
| null | null | null | null |
stat.ME
|
http://creativecommons.org/licenses/by-sa/4.0/
|
It is an important inferential problem to test no association between two
binary variables based on data. Tests based on the sample odds ratio are
commonly used. We bring in a competing test based on the Pearson correlation
coefficient. In particular, the Odds ratio does not extend to higher order
contingency tables, whereas Pearson correlation does. It is important to
understand how Pearson correlation stacks against the odds ratio in 2x2 tables.
Another measure of association is the canonical correlation. In this paper, we
examine how competitive Pearson correlation is vis-\`a-vis odds ratio in terms
of power in the binary context, contrasting further with both the Wald Z and
Rao Score tests. We generated an extensive collection of joint distributions of
the binary variables and estimated the power of the tests under each joint
alternative distribution based on random samples. The consensus is that none of
the tests dominates the other.
|
[{'version': 'v1', 'created': 'Tue, 24 Dec 2019 18:42:43 GMT'}]
|
2019-12-25
|
[array(['Bhuiyan', 'Mohammad Alfrad Nobel', ''], dtype=object)
array(['Wathen', 'Michael J', ''], dtype=object)
array(['Rao', 'M Bhaskara', ''], dtype=object)]
|
17,492 |
1910.01709
|
Soroosh Mariooryad
|
Raza Habib, Soroosh Mariooryad, Matt Shannon, Eric Battenberg, RJ
Skerry-Ryan, Daisy Stanton, David Kao, Tom Bagby
|
Semi-Supervised Generative Modeling for Controllable Speech Synthesis
| null | null | null | null |
cs.CL cs.LG cs.SD eess.AS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a novel generative model that combines state-of-the-art neural
text-to-speech (TTS) with semi-supervised probabilistic latent variable models.
By providing partial supervision to some of the latent variables, we are able
to force them to take on consistent and interpretable purposes, which
previously hasn't been possible with purely unsupervised TTS models. We
demonstrate that our model is able to reliably discover and control important
but rarely labelled attributes of speech, such as affect and speaking rate,
with as little as 1% (30 minutes) supervision. Even at such low supervision
levels we do not observe a degradation of synthesis quality compared to a
state-of-the-art baseline. Audio samples are available on the web.
|
[{'version': 'v1', 'created': 'Thu, 3 Oct 2019 20:18:45 GMT'}]
|
2019-10-07
|
[array(['Habib', 'Raza', ''], dtype=object)
array(['Mariooryad', 'Soroosh', ''], dtype=object)
array(['Shannon', 'Matt', ''], dtype=object)
array(['Battenberg', 'Eric', ''], dtype=object)
array(['Skerry-Ryan', 'RJ', ''], dtype=object)
array(['Stanton', 'Daisy', ''], dtype=object)
array(['Kao', 'David', ''], dtype=object)
array(['Bagby', 'Tom', ''], dtype=object)]
|
17,493 |
2305.14767
|
Andi Wang
|
Andi Wang, Hao Yan, and Juan Du
|
Interpretation and visualization of distance covariance through additive
decomposition of correlations formula
| null | null | null | null |
stat.ME
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Distance covariance is a widely used statistical methodology for testing the
dependency between two groups of variables. Despite the appealing properties of
consistency and superior testing power, the testing results of distance
covariance are often hard to be interpreted. This paper presents an elementary
interpretation of the mechanism of distance covariance through an additive
decomposition of correlations formula. Based on this formula, a visualization
method is developed to provide practitioners with a more intuitive explanation
of the distance covariance score.
|
[{'version': 'v1', 'created': 'Wed, 24 May 2023 06:17:38 GMT'}]
|
2023-05-25
|
[array(['Wang', 'Andi', ''], dtype=object)
array(['Yan', 'Hao', ''], dtype=object)
array(['Du', 'Juan', ''], dtype=object)]
|
17,494 |
2011.04275
|
Angelica Sofia Valeriani
|
Angelica Sofia Valeriani
|
Runtime Performances Benchmark for Knowledge Graph Embedding Methods
|
arXiv admin note: text overlap with arXiv:1903.11406,
arXiv:2002.00819 by other authors
| null | null | null |
cs.LG cs.AR cs.NE cs.PF
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper wants to focus on providing a characterization of the runtime
performances of state-of-the-art implementations of KGE alghoritms, in terms of
memory footprint and execution time. Despite the rapidly growing interest in
KGE methods, so far little attention has been devoted to their comparison and
evaluation; in particular, previous work mainly focused on performance in terms
of accuracy in specific tasks, such as link prediction. To this extent, a
framework is proposed for evaluating available KGE implementations against
graphs with different properties, with a particular focus on the effectiveness
of the adopted optimization strategies. Graphs and models have been trained
leveraging different architectures, in order to enlighten features and
properties of both models and the architectures they have been trained on. Some
results enlightened with experiments in this document are the fact that
multithreading is efficient, but benefit deacreases as the number of threads
grows in case of CPU. GPU proves to be the best architecture for the given
task, even if CPU with some vectorized instructions still behaves well.
Finally, RAM utilization for the loading of the graph never changes between
different architectures and depends only on the type of graph, not on the
model.
|
[{'version': 'v1', 'created': 'Thu, 5 Nov 2020 21:58:11 GMT'}]
|
2020-11-10
|
[array(['Valeriani', 'Angelica Sofia', ''], dtype=object)]
|
17,495 |
1701.01484
|
J. A. Mendez-Bermudez
|
J. A. Mendez-Bermudez, Guilherme Ferraz de Arruda, Francisco A.
Rodrigues, Yamir Moreno
|
Diluted banded random matrices: Scaling behavior of eigenfunction and
spectral properties
|
6 pages, 3 figures. arXiv admin note: text overlap with
arXiv:1611.06695
| null |
10.1088/1751-8121/aa9509
| null |
cond-mat.dis-nn
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We demonstrate that the normalised localization length $\beta$ of the
eigenfunctions of diluted (sparse) banded random matrices follows the scaling
law $\beta=x^*/(1+x^*)$. The scaling parameter of the model is defined as
$x^*\propto(b_{eff}^2/N)^\delta$, where $b_{eff}$ is the average number of
non-zero elements per matrix row, $N$ is the matrix size, and $\delta\sim 1$.
Additionally, we show that $x^*$ also scales the spectral properties of the
model (up to certain sparsity) characterized by the spacing distribution of
eigenvalues.
|
[{'version': 'v1', 'created': 'Thu, 5 Jan 2017 21:28:02 GMT'}]
|
2017-12-06
|
[array(['Mendez-Bermudez', 'J. A.', ''], dtype=object)
array(['de Arruda', 'Guilherme Ferraz', ''], dtype=object)
array(['Rodrigues', 'Francisco A.', ''], dtype=object)
array(['Moreno', 'Yamir', ''], dtype=object)]
|
17,496 |
2108.09045
|
Nina Dresing
|
Nina Dresing, A. Warmuth, F. Effenberger, K.-L. Klein, S. Musset, L.
Glesener, M. Br\"udern
|
Connecting solar flare hard X-ray spectra to in situ electron spectra. A
comparison of RHESSI and STEREO/SEPT observations
|
16 pages, 8 figures
|
A&A 654, A92 (2021)
|
10.1051/0004-6361/202141365
| null |
astro-ph.SR physics.space-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We compare the characteristics of flare-accelerated energetic electrons at
the Sun with those injected into interplanetary space. We have identified 17
energetic electron events well-observed with the SEPT instrument aboard STEREO
which show a clear association with a hard X-ray (HXR) flare observed with the
RHESSI spacecraft. We compare the spectral indices of the RHESSI HXR spectra
with those of the interplanetary electrons. Because of the frequent
double-power-law shape of the in situ electron spectra, we paid special
attention to the choice of the spectral index used for comparison. The time
difference between the electron onsets and the associated type III and
microwave bursts suggests that the electron events are detected at 1 AU with
apparent delays ranging from 9 to 41 minutes. While the parent solar activity
is clearly impulsive, also showing a high correlation with extreme ultraviolet
jets, most of the studied events occur in temporal coincidence with coronal
mass ejections (CMEs). In spite of the observed onset delays and presence of
CMEs in the low corona, we find a significant correlation of about 0.8 between
the spectral indices of the HXR flare and the in situ electrons. The
correlations increase if only events with significant anisotropy are
considered. This suggests that transport effects can alter the injected spectra
leading to a strongly reduced imprint of the flare acceleration. We conclude
that interplanetary transport effects must be taken into account when inferring
the initial acceleration of solar energetic electron events. Although our
results suggest a clear imprint of flare acceleration for the analyzed event
sample, a secondary acceleration might be present which could account for the
observed delays. However, the limited and variable pitch-angle coverage of SEPT
could also be the reason for the observed delays.
|
[{'version': 'v1', 'created': 'Fri, 20 Aug 2021 08:17:52 GMT'}]
|
2021-10-20
|
[array(['Dresing', 'Nina', ''], dtype=object)
array(['Warmuth', 'A.', ''], dtype=object)
array(['Effenberger', 'F.', ''], dtype=object)
array(['Klein', 'K. -L.', ''], dtype=object)
array(['Musset', 'S.', ''], dtype=object)
array(['Glesener', 'L.', ''], dtype=object)
array(['Brüdern', 'M.', ''], dtype=object)]
|
17,497 |
1003.3716
|
Yasufumi Hashimoto
|
Yasufumi Hashimoto
|
Asymptotic formulas for class number sums of indefinite binary quadratic
forms in arithmetic progressions
|
22 pages
|
Int. J. Number Theory 9 (2013), no. 1, pp.27-51
| null | null |
math.NT math.RT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It is known that there is a one-to-one correspondence between equivalence
classes of primitive indefinite binary quadratic forms and primitive hyperbolic
conjugacy classes of the modular group. Due to such a correspondence, Sarnak
obtained the asymptotic formula for the class number sum in order of the
fundamental unit by using the prime geodesic theorem for the modular group. In
the present paper, we propose asymptotic formulas of the class number sums over
discriminants in arithmetic progressions. Since there are relations between the
arithmetic properties of the discriminants and the conjugacy classes in the
finite groups given by the modular group and its congruence subgroups, we can
get the desired asymptotic formulas by arranging the Tchebotarev-type prime
geodesic theorem. While such asymptotic formulas were already given by Raulf,
the approaches are quite different, the expressions of the leading terms of our
asymptotic formulas are simpler and the estimates of the reminder terms are
sharper.
|
[{'version': 'v1', 'created': 'Fri, 19 Mar 2010 05:38:57 GMT'}
{'version': 'v2', 'created': 'Mon, 6 Sep 2010 06:46:18 GMT'}]
|
2015-02-10
|
[array(['Hashimoto', 'Yasufumi', ''], dtype=object)]
|
17,498 |
2010.16360
|
Nuno Picado
|
Nuno Picado, Paulo Eduardo Oliveira
|
Denoising and Interior Detection Problems
| null | null | null | null |
math.ST stat.TH
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Let $\mathcal{M}$ be a compact manifold of $\mathbb{R}^d$. The goal of this
paper is to decide, based on a sample of points, whether the interior of
$\mathcal{M}$ is empty or not. We divide this work in two main parts. Firstly,
under a dependent sample which may or may not contain some noise within, we
characterize asymptotic properties of an interior detection test based on a
suitable control of the dependence. Afterwards, we drop the dependence and
consider a model where the points sampled from the manifold are mixed with some
points sampled from a different measure (noisy observations). We study the
behaviour with respect to the amount of noisy observations, introducing a
methodology to identify true manifold points, characterizing convergence
properties.
|
[{'version': 'v1', 'created': 'Fri, 30 Oct 2020 16:34:34 GMT'}]
|
2020-11-02
|
[array(['Picado', 'Nuno', ''], dtype=object)
array(['Oliveira', 'Paulo Eduardo', ''], dtype=object)]
|
17,499 |
1709.09788
|
Alex Hernandez Ardila
|
Alex H. Ardila
|
Orbital stability of standing waves for a system of nonlinear
Schr\"{o}dinger equations with three wave interaction
|
21 pages; revised version incorporating referees' comments
|
Nonlinear Analysis-Theory Methods & Applications, V. 167, P. 1-20,
2018
|
10.1016/j.na.2017.10.013
| null |
math.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the existence and stability of standing waves solutions of a
three-coupled nonlinear Schr\"{o}dinger system related to the Raman
amplification in a plasma. By means of the concentration-compacteness method,
we provide a characterization of the standing waves solutions as minimizers of
an energy functional subject to three independent $L^{2}$ mass constraints. As
a consequence, we establish existence and orbital stability of solitary waves.
|
[{'version': 'v1', 'created': 'Thu, 28 Sep 2017 02:51:42 GMT'}]
|
2017-12-05
|
[array(['Ardila', 'Alex H.', ''], dtype=object)]
|
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