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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
4,600 |
1403.1428
|
Sergey Pulkin A
|
S.A. Pulkin, A. Kalinichev, V. Arnautov, S.V. Uvarova, S. Savel'eva
|
Nonlinear Doppler - Free comb-spectroscopy in counter-propagating fields
| null | null | null | null |
physics.optics physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The method of Doppler - free comb - spectroscopy for dipole transitions was
proposed. The calculations for susceptibility spectrum for moving two-level
atoms driving by strong counter propagating combs have been done. The used
theoretical method based on the Fourier expansion of the components of density
matrix on two rows on kv (v-velocity of group of atoms, k-projection of wave
vector) and {\Omega} (frequency between comb components). For testing of
validity of this method the direct numerical integration was done. The narrow
peaks with homogeneous width arise on the background of Doppler counter. The
contrast of these peaks is large for largest amplitudes of comb-components.
Power broadening is increasing with increase of field amplitudes. The spectral
range of absorption spectrum is determined by the spectral range of comb
generator and all homogeneous lines arise simultaneously. The spectral
resolution is determined by the width of homogeneously-broadening lines. The
physical nature of narrow peaks is in the existence of multi-photon transitions
between manifolds of quasi-energy levels arising for different groups of atoms
moving with velocities that satisfy to the resonant conditions 2kv=
(n+l){\Omega}, where n, l - are integers and {\Omega} - frequency difference
between comb teeth.
|
[{'version': 'v1', 'created': 'Thu, 6 Mar 2014 12:25:46 GMT'}]
|
2014-03-07
|
[array(['Pulkin', 'S. A.', ''], dtype=object)
array(['Kalinichev', 'A.', ''], dtype=object)
array(['Arnautov', 'V.', ''], dtype=object)
array(['Uvarova', 'S. V.', ''], dtype=object)
array(["Savel'eva", 'S.', ''], dtype=object)]
|
4,601 |
1509.09080
|
Laurent Thomann
|
Pierre Germain (CIMS), Laurent Thomann (IECL)
|
On the high frequency limit of the LLL equation
|
9 pages
| null | null | null |
math.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive heuristically an integro-differential equation, as well as a shell
model, governing the dynamics of the Lowest Landau Level equation in a high
frequency regime.
|
[{'version': 'v1', 'created': 'Wed, 30 Sep 2015 08:48:20 GMT'}]
|
2015-10-01
|
[array(['Germain', 'Pierre', '', 'CIMS'], dtype=object)
array(['Thomann', 'Laurent', '', 'IECL'], dtype=object)]
|
4,602 |
1611.05515
|
Alexandre Deur
|
A. Deur
|
Self-interacting scalar fields at high-temperature
|
33 pages, 19 figures. Version published in Eur. Phys. J. C
|
Eur. Phys. J. C77 (2017) no.6, 412
|
10.1140/epjc/s10052-017-4971-x
| null |
hep-ph astro-ph.GA gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study two self-interacting scalar field theories in their high-temperature
limit using path integrals on a lattice. We first discuss the formalism and
recover known potentials to validate the method. We then discuss how these
theories can model, in the high-temperature limit, the strong interaction and
General Relativity. For the strong interaction, the model recovers the known
phenomenology of the nearly static regime of heavy quarkonia. The model also
exposes a possible origin for the emergence of the confinement scale from the
approximately conformal Lagrangian. Aside from such possible insights, the main
purpose of addressing the strong interaction here --given that more
sophisticated approaches already exist-- is mostly to further verify the
pertinence of the model in the more complex case of General Relativity for
which non-perturbative methods are not as developed. The results have important
implications on the nature of Dark Matter. In particular, non-perturbative
effects naturally provide flat rotation curves for disk galaxies, without need
for non-baryonic matter, and explain as well other observations involving Dark
Matter such as cluster dynamics or the dark mass of elliptical galaxies.
|
[{'version': 'v1', 'created': 'Thu, 17 Nov 2016 00:20:03 GMT'}
{'version': 'v2', 'created': 'Thu, 15 Jun 2017 15:37:10 GMT'}]
|
2017-07-11
|
[array(['Deur', 'A.', ''], dtype=object)]
|
4,603 |
1606.04632
|
Tsutomu Fukuda
|
T. Fukuda (for the OPERA Collaboration)
|
Discovery of Tau Neutrino Appearance and Recent Results from OPERA
|
8 pages, 5 figures, 1 table, Proceedings of LaThuile2016, the XXXth
Rencontres de Physique de la Vall\'ee d'Aoste, March 6-12, 2016, La Thuile,
Aosta Valley, Italy. To be published by Nuovo Cimento C
| null |
10.1393/ncc/i2016-16315-9
| null |
hep-ex physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The OPERA experiment was designed to observe ${\nu_{\mu}}$ ${\rightarrow}$
${\nu_{\tau}}$ oscillations through ${\nu_{\tau}}$ appearance at a baseline of
730 km in the CNGS beam. Newly developed emulsion analysis technology allows to
measure ${\nu_e}$, ${\nu_{\mu}}$ and ${\nu_{\tau}}$ interactions with the
largest emulsion detector ever made. OPERA has detected five ${\nu_{\tau}}$
candidates, allowing to reject the background-only hypothesis at 5.1
${\sigma}$. The parameters for standard and non-standard oscillations are
measured and constrained.
|
[{'version': 'v1', 'created': 'Wed, 15 Jun 2016 03:32:57 GMT'}]
|
2019-08-13
|
[array(['Fukuda', 'T.', '', 'for the OPERA Collaboration'], dtype=object)]
|
4,604 |
1906.08614
|
Daniel Daigle
|
Pierrette Cassou-Nogu\`es and Daniel Daigle
|
Field generators in two variables and birational endomorphisms of
$\mathbb{A}^2$
|
Published in a volume in memory of Shreeram S. Abhyankar
|
J. Algebra Appl., Vol. 14, 2015
| null | null |
math.AG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This article is a survey of two subjects: the first part is devoted to field
generators in two variables, and the second to birational endomorphisms of the
affine plane. Each one of these subjects originated in Abhyankar's seminar in
Purdue University in the 1970s. Note that the part on field generators is more
than a survey, since it contains a considerable amount of new material.
|
[{'version': 'v1', 'created': 'Thu, 20 Jun 2019 13:44:53 GMT'}]
|
2019-06-21
|
[array(['Cassou-Noguès', 'Pierrette', ''], dtype=object)
array(['Daigle', 'Daniel', ''], dtype=object)]
|
4,605 |
1910.05981
|
Wenhui Chen
|
Wenhui Chen and Ahmad Z. Fino
|
Blow-up of solutions to semilinear strongly damped wave equations with
different nonlinear terms in an exterior domain
| null | null |
10.1002/mma.7223
| null |
math.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we consider the initial boundary value problem in an exterior
domain for semilinear strongly damped wave equations with power nonlinear term
of the derivative-type $|u_t|^q$ or the mixed-type $|u|^p+|u_t|^q$, where
$p,q>1$. On one hand, employing the Banach fixed-point theorem we prove local
(in time) existence of mild solutions. On the other hand, under some conditions
for initial data and the exponents of power nonlinear terms, the blow-up
results are derived by applying the test function method.
|
[{'version': 'v1', 'created': 'Mon, 14 Oct 2019 08:33:20 GMT'}]
|
2021-01-21
|
[array(['Chen', 'Wenhui', ''], dtype=object)
array(['Fino', 'Ahmad Z.', ''], dtype=object)]
|
4,606 |
1406.4127
|
Christoph Mordasini
|
C. Mordasini
|
Grain opacity and the bulk composition of extrasolar planets. II. An
analytical model for the grain opacity in protoplanetary atmospheres
|
33 pages, 19 figures. Accepted to A&A. Identical to V1 except for
updated references
|
A&A 572, A118 (2014)
|
10.1051/0004-6361/201423702
| null |
astro-ph.EP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Context. We investigate the grain opacity k_gr in the atmosphere of
protoplanets. This is important for the planetary mass-radius relation since
k_gr affects the H/He envelope mass of low-mass planets and the critical core
mass of giant planets. Aims. The goal of this study is to derive an analytical
model for k_gr. Methods. Our model is based on the comparison of the timescales
of microphysical processes like grain settling in the Stokes and Epstein
regime, growth by Brownian motion coagulation and differential settling, grain
evaporation, and grain advection due to envelope contraction. With these
timescales we derive the grain size, abundance, and opacity. Results. We find
that the main growth process is differential settling. In this regime, k_gr has
a simple functional form and is given as 27 Q/8 H rho in the Epstein regime and
as 2 Q/H rho for Stokes drag. Grain dynamics lead to a typical radial structure
of k_gr with high ISM-like values in the top layers but a strong decrease in
the deeper parts where the grain-free molecular opacities take over.
Conclusions. In agreement with earlier results we find that k_gr is typically
much lower than in the ISM. The equations also show that a higher dust input in
the top layer does not strongly increase k_gr with two important implications.
First, for a formation of giant planet cores via pebbles, there could be the
issue that pebbles increase the grain input high in the atmosphere due to
ablation. This could potentially increase k_gr hindering giant planet
formation. Our study shows that this adverse effect should not occur. Second,
it means that a higher stellar [Fe/H] which presumably leads to a higher
surface density of planetesimals only favors giant planet formation without
being detrimental to it due to an increased k_gr. This corroborates the result
that core accretion explains the increase of the giant planet frequency with
[Fe/H].
|
[{'version': 'v1', 'created': 'Mon, 16 Jun 2014 20:00:01 GMT'}
{'version': 'v2', 'created': 'Sun, 29 Jun 2014 14:08:48 GMT'}]
|
2014-12-10
|
[array(['Mordasini', 'C.', ''], dtype=object)]
|
4,607 |
1010.4602
|
Xiaohui Ling
|
Xiaohui Ling, Zhixiang Tang, Hailu Luo, Huimin Dong, Zhaoming Luo,
Shuangchun Wen and Dianyuan Fan
|
Zitterbewegung-like effect near the Dirac point in metamaterials and
photonic crystals
|
5 pages, 5 figures
| null | null | null |
physics.optics
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a physical explanation of Zitterbewegung-like effect near the
zero-refractive-index point in a metamaterial slab in this paper. Between the
negative and positive refractive index regions centered at the
zero-refractive-index point, the transmittance spectrum distribution of the
metamaterial slab is asymmetrical. When a symmetrical pulse propagates through
the metamaterial slab, its transmitted spectrum becomes asymmetrical due to the
asymmetry of the transmittance spectrum of the slab, leading to a transmitted
pulse with an asymmetrical temporal shape. The asymmetry manifests a kind of
temporally tailed oscillations, i.e., the Zitterbewegung-like effect. Further,
the effect of the temporal and spatial widths of pulse, and the thickness of
metamaterial slab on the tailed oscillations of the transmitted pulse has also
been discussed. Our results agree well with what the other researchers obtained
on the strength of relativistic quantum concepts; however, the viewpoint of our
analysis is classical and irrelevant to relativistic quantum mechanics.
|
[{'version': 'v1', 'created': 'Fri, 22 Oct 2010 01:07:32 GMT'}
{'version': 'v2', 'created': 'Tue, 26 Oct 2010 02:57:10 GMT'}]
|
2010-10-27
|
[array(['Ling', 'Xiaohui', ''], dtype=object)
array(['Tang', 'Zhixiang', ''], dtype=object)
array(['Luo', 'Hailu', ''], dtype=object)
array(['Dong', 'Huimin', ''], dtype=object)
array(['Luo', 'Zhaoming', ''], dtype=object)
array(['Wen', 'Shuangchun', ''], dtype=object)
array(['Fan', 'Dianyuan', ''], dtype=object)]
|
4,608 |
1007.3958
|
Laurent Decreusefond
|
Laurent Decreusefond, Jean-St\'ephane Dhersin, Pascal Moyal, Viet Chi
Tran
|
Large graph limit for an SIR process in random network with
heterogeneous connectivity
|
Published in at http://dx.doi.org/10.1214/11-AAP773 the Annals of
Applied Probability (http://www.imstat.org/aap/) by the Institute of
Mathematical Statistics (http://www.imstat.org)
|
Annals of Applied Probability 2012, Vol. 22, No. 2, 541-575
|
10.1214/11-AAP773
|
IMS-AAP-AAP773
|
math.PR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider an SIR epidemic model propagating on a configuration model
network, where the degree distribution of the vertices is given and where the
edges are randomly matched. The evolution of the epidemic is summed up into
three measure-valued equations that describe the degrees of the susceptible
individuals and the number of edges from an infectious or removed individual to
the set of susceptibles. These three degree distributions are sufficient to
describe the course of the disease. The limit in large population is
investigated. As a corollary, this provides a rigorous proof of the equations
obtained by Volz [Mathematical Biology 56 (2008) 293--310].
|
[{'version': 'v1', 'created': 'Thu, 22 Jul 2010 18:21:28 GMT'}
{'version': 'v2', 'created': 'Sat, 5 Feb 2011 20:56:42 GMT'}
{'version': 'v3', 'created': 'Sun, 26 Jun 2011 18:48:01 GMT'}
{'version': 'v4', 'created': 'Tue, 8 May 2012 05:27:40 GMT'}]
|
2012-05-09
|
[array(['Decreusefond', 'Laurent', ''], dtype=object)
array(['Dhersin', 'Jean-Stéphane', ''], dtype=object)
array(['Moyal', 'Pascal', ''], dtype=object)
array(['Tran', 'Viet Chi', ''], dtype=object)]
|
4,609 |
2205.13997
|
Mycal Tucker
|
Mycal Tucker, Julie Shah
|
Prototype Based Classification from Hierarchy to Fairness
| null | null | null | null |
cs.LG cs.AI
|
http://creativecommons.org/licenses/by/4.0/
|
Artificial neural nets can represent and classify many types of data but are
often tailored to particular applications -- e.g., for "fair" or "hierarchical"
classification. Once an architecture has been selected, it is often difficult
for humans to adjust models for a new task; for example, a hierarchical
classifier cannot be easily transformed into a fair classifier that shields a
protected field. Our contribution in this work is a new neural network
architecture, the concept subspace network (CSN), which generalizes existing
specialized classifiers to produce a unified model capable of learning a
spectrum of multi-concept relationships. We demonstrate that CSNs reproduce
state-of-the-art results in fair classification when enforcing concept
independence, may be transformed into hierarchical classifiers, or even
reconcile fairness and hierarchy within a single classifier. The CSN is
inspired by existing prototype-based classifiers that promote interpretability.
|
[{'version': 'v1', 'created': 'Fri, 27 May 2022 14:21:41 GMT'}]
|
2022-05-30
|
[array(['Tucker', 'Mycal', ''], dtype=object)
array(['Shah', 'Julie', ''], dtype=object)]
|
4,610 |
2103.13752
|
Francesco Zanini
|
Francesco Zanini and Alessandro Chiuso
|
Estimating Koopman operators for nonlinear dynamical systems: a
nonparametric approach
|
Pre-print submitted for 19th IFAC Symposium, System Identification:
learning models for decision and control
| null | null | null |
cs.LG
|
http://creativecommons.org/licenses/by/4.0/
|
The Koopman operator is a mathematical tool that allows for a linear
description of non-linear systems, but working in infinite dimensional spaces.
Dynamic Mode Decomposition and Extended Dynamic Mode Decomposition are amongst
the most popular finite dimensional approximation. In this paper we capture
their core essence as a dual version of the same framework, incorporating them
into the Kernel framework. To do so, we leverage the RKHS as a suitable space
for learning the Koopman dynamics, thanks to its intrinsic finite-dimensional
nature, shaped by data. We finally establish a strong link between kernel
methods and Koopman operators, leading to the estimation of the latter through
Kernel functions. We provide also simulations for comparison with standard
procedures.
|
[{'version': 'v1', 'created': 'Thu, 25 Mar 2021 11:08:26 GMT'}]
|
2021-03-26
|
[array(['Zanini', 'Francesco', ''], dtype=object)
array(['Chiuso', 'Alessandro', ''], dtype=object)]
|
4,611 |
1907.03728
|
Ziyue Xu
|
Ziyue Xu, Xiaosong Wang, Hoo-Chang Shin, Dong Yang, Holger Roth,
Fausto Milletari, Ling Zhang, Daguang Xu
|
Correlation via synthesis: end-to-end nodule image generation and
radiogenomic map learning based on generative adversarial network
| null | null | null | null |
cs.CV eess.IV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Radiogenomic map linking image features and gene expression profiles is
useful for noninvasively identifying molecular properties of a particular type
of disease. Conventionally, such map is produced in three separate steps: 1)
gene-clustering to "metagenes", 2) image feature extraction, and 3) statistical
correlation between metagenes and image features. Each step is independently
performed and relies on arbitrary measurements. In this work, we investigate
the potential of an end-to-end method fusing gene data with image features to
generate synthetic image and learn radiogenomic map simultaneously. To achieve
this goal, we develop a generative adversarial network (GAN) conditioned on
both background images and gene expression profiles, synthesizing the
corresponding image. Image and gene features are fused at different scales to
ensure the realism and quality of the synthesized image. We tested our method
on non-small cell lung cancer (NSCLC) dataset. Results demonstrate that the
proposed method produces realistic synthetic images, and provides a promising
way to find gene-image relationship in a holistic end-to-end manner.
|
[{'version': 'v1', 'created': 'Mon, 8 Jul 2019 17:17:18 GMT'}]
|
2019-07-09
|
[array(['Xu', 'Ziyue', ''], dtype=object)
array(['Wang', 'Xiaosong', ''], dtype=object)
array(['Shin', 'Hoo-Chang', ''], dtype=object)
array(['Yang', 'Dong', ''], dtype=object)
array(['Roth', 'Holger', ''], dtype=object)
array(['Milletari', 'Fausto', ''], dtype=object)
array(['Zhang', 'Ling', ''], dtype=object)
array(['Xu', 'Daguang', ''], dtype=object)]
|
4,612 |
1508.00838
|
Peter Bl\"umler
|
Andreas Maul, Peter Bl\"umler, Werner Heil, Anna Nikiel, Ernst Otten,
Andreas Petrich, Thomas Schmidt
|
Spherical Fused Silica Cells Filled with Pure Helium for
NMR-Magnetometry
|
17 pages, 4 figures
| null |
10.1063/1.4938251
| null |
physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
High magnetic fields (> 1 T) are measured by NMR magnetometers with
un-rivaled precision if the precessing spin sample provides long coherence
times. The longest coherence times are found in diluted ${}^{3}$He samples,
which can be hyperpolarized for sufficient signal strength. In order to have
minimal influence on the homogeneity and value of the measured magnetic field
the optimal container for the ${}^{3}$He should be a perfect sphere. A fused
silica sphere with an inner diameter of 8 mm and an outer diameter of 12 mm was
made from two hemispheres by diffusion bonding leaving only a small hole for
cleaning and evacuation. This hole was closed in vacuum by a CO${}_{2}$ laser
and the inner volume was filled with a few mbars of ${}^3$He via wall
permeation. NMR-measurements on such a sample had coherence times of 5 min.
While the hemispheres were produced with < 1 $\mu$m deviation from sphericity,
the bonding left a step of ca. 50 $\mu$m at maximum. The influence of such a
mismatch, its orientation and materials in the direct vicinity of the sample
are analyzed by FEM-simulations and discussed in view of coherence times and
absolute fields.
|
[{'version': 'v1', 'created': 'Tue, 4 Aug 2015 17:13:19 GMT'}
{'version': 'v2', 'created': 'Wed, 9 Sep 2015 10:50:50 GMT'}]
|
2016-01-20
|
[array(['Maul', 'Andreas', ''], dtype=object)
array(['Blümler', 'Peter', ''], dtype=object)
array(['Heil', 'Werner', ''], dtype=object)
array(['Nikiel', 'Anna', ''], dtype=object)
array(['Otten', 'Ernst', ''], dtype=object)
array(['Petrich', 'Andreas', ''], dtype=object)
array(['Schmidt', 'Thomas', ''], dtype=object)]
|
4,613 |
1312.1240
|
Carmine Vittoria -
|
Carmine Vittoriaa, Somu Sivasubramanianb and Allan Widomc
|
Tensor Properties of the Magneto-electric Coupling in Hexaferrites
|
7 Pages
|
Phys. Rev. B 89, 134413 (2014)
|
10.1103/PhysRevB.89.134413
| null |
cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent data reported on the magneto-electric coupling,{\alpha}, of
hexaferrite materials is very high, and they have the potential to impact
future technologies in a major way. The fundamental question addressed in this
paper is what does {\alpha} depend on and, therefore, to what extent can
{\alpha} increase in future experiments. Mathematical formulation of a
microscopic theory would be rather complex, especially for a complex crystal
structure as the Z-type hexaferrite, for example. We have opted for a
thermodynamic argument in which a functional relationship between {\alpha} and
material parameters was derived. We find that {\alpha} is best described as a
tensor property proportional to the product of the magnetostriction and
piezoelectric strain tensors. Quantitative estimates of {\alpha} are given for
hexaferrites and composites.
|
[{'version': 'v1', 'created': 'Wed, 4 Dec 2013 16:45:47 GMT'}]
|
2014-04-23
|
[array(['Vittoriaa', 'Carmine', ''], dtype=object)
array(['Sivasubramanianb', 'Somu', ''], dtype=object)
array(['Widomc', 'Allan', ''], dtype=object)]
|
4,614 |
0709.0215
|
Arnold O. Benz
|
A. O. Benz (1), P. Staeuber (1), T. L. Bourke (3) F.F.S. vanderTak (3
and 4), E. F. van Dishoeck (5) and J. K. Joergensen (2) ((1) ETH Zurich, (2)
CfA Cambridge, (3) MPI Bonn, (4) SRON Groningen, (5) Obs. Leiden)
|
Energetic radiation and the sulfur chemistry of protostellar envelopes:
Submillimeter interferometry of AFGL 2591
|
Astronomy and Astrophysics, in press
| null |
10.1051/0004-6361:20078032
| null |
astro-ph
| null |
CONTEXT: The chemistry in the inner few thousand AU of accreting envelopes
around young stellar objects is predicted to vary greatly with far-UV and X-ray
irradiation by the central star. Aim We search for molecular tracers of
high-energy irradiation by the protostar in the hot inner envelope. METHODS:
The Submillimeter Array (SMA) has observed the high-mass star forming region
AFGL 2591 in lines of CS, SO, HCN, HCN(v2=1), and HC15N with 0.6" resolution at
350 GHz probing radial scales of 600-3500 AU for an assumed distance of 1 kpc.
The SMA observations are compared with the predictions of a chemical model
fitted to previous single-dish observations. RESULTS: The CS and SO main peaks
are extended in space at the FWHM level, as predicted in the model assuming
protostellar X-rays. However, the main peak sizes are found smaller than
modeled by nearly a factor of 2. On the other hand, the lines of CS, HCN, and
HC15N, but not SO and HCN(v2=1), show pedestal emissions at radii of about 3500
AU that are not predicted. All lines except SO show a secondary peak within the
approaching outflow cone. A dip or null in the visibilities caused by a sharp
decrease in abundance with increasing radius is not observed in CS and only
tentatively in SO. CONCLUSIONS: The emission of protostellar X-rays is
supported by the good fit of the modeled SO and CS amplitude visibilities
including an extended main peak in CS. The broad pedestals can be interpreted
by far-UV irradiation in a spherically non-symmetric geometry, possibly
comprising outflow walls on scales of 3500 -- 7000 AU. The extended CS and SO
main peaks suggest sulfur evaporation near the 100 K temperature radius.
|
[{'version': 'v1', 'created': 'Mon, 3 Sep 2007 12:44:08 GMT'}]
|
2009-11-13
|
[array(['Benz', 'A. O.', '', '3\n and 4'], dtype=object)
array(['Staeuber', 'P.', '', '3\n and 4'], dtype=object)
array(['Bourke', 'T. L.', '', '3\n and 4'], dtype=object)
array(['vanderTak', 'F. F. S.', '', '3\n and 4'], dtype=object)
array(['van Dishoeck', 'E. F.', ''], dtype=object)
array(['Joergensen', 'J. K.', ''], dtype=object)]
|
4,615 |
2007.07535
|
Tobias Galla
|
Nagi Khalil, Tobias Galla
|
Zealots in multi-state noisy voter models
|
17 pages, 9 figures
|
Phys. Rev. E 103, 012311 (2021)
|
10.1103/PhysRevE.103.012311
| null |
physics.soc-ph cond-mat.stat-mech
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The noisy voter model is a stylised representation of opinion dynamics.
Individuals copy opinions from other individuals, and are subject to
spontaneous state changes. In the case of two opinion states this model is
known to have a noise-driven transition between a unimodal phase, in which both
opinions are present, and a bimodal phase in which one of the opinions
dominates. The presence of zealots can remove the unimodal and bimodal phases
in the model with two opinion states. Here, we study the effects of zealots in
noisy voter models with M>2 opinion states on complete interaction graphs. We
find that the phase behaviour diversifies, with up to six possible
qualitatively different types of stationary states. The presence of zealots
removes some of these phases, but not all. We analyse situations in which
zealots affect the entire population, or only a fraction of agents, and show
that this situation corresponds to a single-community model with a fractional
number of zealots, further enriching the phase diagram. Our study is conducted
analytically based on effective birth-death dynamics for the number of
individuals holding a given opinion. Results are confirmed in numerical
simulations.
|
[{'version': 'v1', 'created': 'Wed, 15 Jul 2020 08:19:22 GMT'}]
|
2021-02-10
|
[array(['Khalil', 'Nagi', ''], dtype=object)
array(['Galla', 'Tobias', ''], dtype=object)]
|
4,616 |
0908.3641
|
Radja Boughezal
|
Radja Boughezal
|
Theoretical Status of Higgs Production at Hadron Colliders in the SM
|
8 pages, 6 figures, 3 tables, invited talk at the 2009 meeting of the
division of particles and fields of the American physical society (DPF 2009),
26-31 July 2009
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We briefly review the current status of theoretical calculations for Higgs
production at hadron colliders within the Standard Model. We focus on the main
production mechanisms and decay modes at the Tevatron and the LHC.
|
[{'version': 'v1', 'created': 'Tue, 25 Aug 2009 16:30:23 GMT'}]
|
2009-08-26
|
[array(['Boughezal', 'Radja', ''], dtype=object)]
|
4,617 |
2110.00534
|
Aishwarya Padmakumar
|
Aishwarya Padmakumar, Jesse Thomason, Ayush Shrivastava, Patrick
Lange, Anjali Narayan-Chen, Spandana Gella, Robinson Piramuthu, Gokhan Tur,
Dilek Hakkani-Tur
|
TEACh: Task-driven Embodied Agents that Chat
|
Accepted at AAAI 2022; 7 pages main, 28 pages total, 29 figures;
Version 3 uses a new test set for EDH instances that restrict evaluation to
state changes only on task-relevant objects
| null | null | null |
cs.CV cs.AI cs.CL cs.RO
|
http://creativecommons.org/licenses/by-sa/4.0/
|
Robots operating in human spaces must be able to engage in natural language
interaction with people, both understanding and executing instructions, and
using conversation to resolve ambiguity and recover from mistakes. To study
this, we introduce TEACh, a dataset of over 3,000 human--human, interactive
dialogues to complete household tasks in simulation. A Commander with access to
oracle information about a task communicates in natural language with a
Follower. The Follower navigates through and interacts with the environment to
complete tasks varying in complexity from "Make Coffee" to "Prepare Breakfast",
asking questions and getting additional information from the Commander. We
propose three benchmarks using TEACh to study embodied intelligence challenges,
and we evaluate initial models' abilities in dialogue understanding, language
grounding, and task execution.
|
[{'version': 'v1', 'created': 'Fri, 1 Oct 2021 17:00:14 GMT'}
{'version': 'v2', 'created': 'Fri, 15 Oct 2021 17:08:43 GMT'}
{'version': 'v3', 'created': 'Wed, 29 Dec 2021 02:25:05 GMT'}]
|
2021-12-30
|
[array(['Padmakumar', 'Aishwarya', ''], dtype=object)
array(['Thomason', 'Jesse', ''], dtype=object)
array(['Shrivastava', 'Ayush', ''], dtype=object)
array(['Lange', 'Patrick', ''], dtype=object)
array(['Narayan-Chen', 'Anjali', ''], dtype=object)
array(['Gella', 'Spandana', ''], dtype=object)
array(['Piramuthu', 'Robinson', ''], dtype=object)
array(['Tur', 'Gokhan', ''], dtype=object)
array(['Hakkani-Tur', 'Dilek', ''], dtype=object)]
|
4,618 |
hep-ex/0309005
|
Farrukh Azfar
|
Farrukh Azfar
|
B Lambda_b and Charm Results from the Tevatron
|
10 pages, 8 figures (+ 1 photo) Physics in Collision 2003 PNC FRAT06
|
ECONF C030626:FRAT05,2003
| null | null |
hep-ex
| null |
Recent results on $B_d$, $B_u^{\pm}$, $B_s$, $\Lambda_b$ and Charm hadrons
are reported from $\approx$ 75pb$^{-1}$ and $\approx$ 40 pb$^{-1}$ of data
accumulated at the upgraded CDF and D0 experiments at the Fermilab Tevatron
$\bar{p}-p$ collider, during Run-II. These include lifetime and mass
measurements of $B$ and Charm hadrons, searches for rare decays in charm and
$B$ hadrons and CP-violation in Charm decays. Results relevant to CP-violation
in B-decays are also reported.
|
[{'version': 'v1', 'created': 'Mon, 1 Sep 2003 12:48:28 GMT'}
{'version': 'v2', 'created': 'Tue, 2 Sep 2003 10:53:26 GMT'}]
|
2010-11-23
|
[array(['Azfar', 'Farrukh', ''], dtype=object)]
|
4,619 |
astro-ph/0205206
|
Joerg Jaeckel
|
Michael Doran and Joerg Jaeckel
|
Loop Corrections to Scalar Quintessence Potentials
|
Contributed to XXXVIIth Rencontres de Moriond Workshop on "The
Cosmological Model", Les Arcs, France, 16-23 March 2002
| null | null |
HD-THEP-02-15
|
astro-ph
| null |
The stability of scalar quintessence potentials under quantum fluctuations is
investigated both for uncoupled models and models with a coupling to fermions.
We find that uncoupled models are usually stable in the late universe. However,
a coupling to fermions is severely restricted. We check whether a graviton
induced fermion-quintessence coupling is compatible with this restriction.
|
[{'version': 'v1', 'created': 'Tue, 14 May 2002 17:35:08 GMT'}]
|
2007-05-23
|
[array(['Doran', 'Michael', ''], dtype=object)
array(['Jaeckel', 'Joerg', ''], dtype=object)]
|
4,620 |
1811.02562
|
Larry Zamick
|
Arun Kingan and Larry Zamick
|
Matrix Model of Strength Distribution: Extension and Phase Transition
| null |
International Journal of Modern Physics E Vol.27, NO 10
(2018)1850087
|
10.1142/S0218301318500878
| null |
nucl-th nucl-ex quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work we extend a previous study of matrix models of strength
distributions. We still retain the nearest neighbor coupling mode but we extend
the values the coupling parameter v. We consider extremes, from very smal v to
very large v. We first use the same transiiton operator as before \textless{}n
T(n+1)\textgreater{} =constat(=1). For this case we get an exponential
decreasefor small v but we get a phase transition beyond v=10. In that case we
get an even-odd effect-separate exponentials for even n and for odd n. We now
also consider also the dipole choice--where \textless{}nT(n+1)\textgreater{} =
$\sqrt{(n+1)}$ .
|
[{'version': 'v1', 'created': 'Wed, 7 Nov 2018 15:16:08 GMT'}
{'version': 'v2', 'created': 'Fri, 9 Nov 2018 01:40:00 GMT'}]
|
2018-11-13
|
[array(['Kingan', 'Arun', ''], dtype=object)
array(['Zamick', 'Larry', ''], dtype=object)]
|
4,621 |
0804.4788
|
Peter W\"urtz
|
Tatjana Gericke, Peter W\"urtz, Daniel Reitz, Tim Langen, and Herwig
Ott
|
High Resolution Imaging of Single Atoms in a Quantum Gas
|
5 pages, 5 figures
| null | null | null |
cond-mat.other
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Our knowledge on ultracold quantum gases is strongly influenced by our
ability to probe these objects. In situ imaging combined with single atom
sensitivity is an especially appealing scenario as it can provide direct
information on the structure and the correlations of such systems. For a
precise characterization a high spatial resolution is mandatory. In particular,
the perspective to study quantum gases in optical lattices makes a resolution
well below one micrometer highly desirable. Here, we report on a novel
microscopy technique which is based on scanning electron microscopy and allows
for the detection of single atoms inside a quantum gas with a spatial
resolution of better than 150 nm. Imaging a Bose-Einstein condensate in a
one-dimensional optical lattice with 600 nm period we demonstrate single site
addressability in a sub-um optical lattice. The technique offers exciting
possibilities for the preparation, manipulation and analysis of quantum gases.
|
[{'version': 'v1', 'created': 'Wed, 30 Apr 2008 10:53:55 GMT'}]
|
2008-05-01
|
[array(['Gericke', 'Tatjana', ''], dtype=object)
array(['Würtz', 'Peter', ''], dtype=object)
array(['Reitz', 'Daniel', ''], dtype=object)
array(['Langen', 'Tim', ''], dtype=object)
array(['Ott', 'Herwig', ''], dtype=object)]
|
4,622 |
1705.10965
|
Russell Anderson
|
M. Jasperse, M. J. Kewming, S. N. Fischer, P. Pakkiam, R. P. Anderson,
L. D. Turner
|
Magic-wavelength Faraday probe measures spin continuously and without
light shifts
| null |
Phys. Rev. A 96, 063402 (2017)
|
10.1103/PhysRevA.96.063402
| null |
quant-ph cond-mat.quant-gas physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We describe a dispersive Faraday optical probe of atomic spin which performs
a weak measurement of spin projection of a quantum gas continuously for more
than one second. To date focusing bright far-off-resonance probes onto quantum
gases has proved invasive, due to strong scalar and vector light shifts
exerting dipole and Stern-Gerlach forces. We show that tuning the probe near
the magic-zero wavelength at 790 nm between the fine-structure doublet of
$^{87}$Rb cancels the scalar light shift, and careful control of polarization
eliminates the vector light shift. Faraday rotations due to each fine-structure
line reinforce at this wavelength, enhancing the signal-to-noise ratio for a
fixed rate of probe-induced decoherence. Using this minimally-invasive spin
probe we perform microscale atomic magnetometry at high temporal resolution.
Spectrogram analysis of the Larmor precession signal of a single spinor
Bose-Einstein condensate measures a time-varying magnetic field strength with 1
{\mu}G accuracy every 5 ms; or equivalently makes > 200 successive measurements
each at $10\,\mathrm{pT/\sqrt{Hz}}$ sensitivity.
|
[{'version': 'v1', 'created': 'Wed, 31 May 2017 07:42:37 GMT'}]
|
2017-12-06
|
[array(['Jasperse', 'M.', ''], dtype=object)
array(['Kewming', 'M. J.', ''], dtype=object)
array(['Fischer', 'S. N.', ''], dtype=object)
array(['Pakkiam', 'P.', ''], dtype=object)
array(['Anderson', 'R. P.', ''], dtype=object)
array(['Turner', 'L. D.', ''], dtype=object)]
|
4,623 |
physics/0209048
|
Juan Pablo Neirotti
|
Juan Pablo Neirotti and Nestor Caticha
|
Dynamical transitions in the evolution of learning algorithms by
selection
|
11 pages, 11 figures, 2 tables
| null |
10.1103/PhysRevE.67.041912
| null |
physics.bio-ph cond-mat.dis-nn
| null |
We study the evolution of artificial learning systems by means of selection.
Genetic programming is used to generate a sequence of populations of algorithms
which can be used by neural networks for supervised learning of a rule that
generates examples. In opposition to concentrating on final results, which
would be the natural aim while designing good learning algorithms, we study the
evolution process and pay particular attention to the temporal order of
appearance of functional structures responsible for the improvements in the
learning process, as measured by the generalization capabilities of the
resulting algorithms. The effect of such appearances can be described as
dynamical phase transitions. The concepts of phenotypic and genotypic
entropies, which serve to describe the distribution of fitness in the
population and the distribution of symbols respectively, are used to monitor
the dynamics. In different runs the phase transitions might be present or not,
with the system finding out good solutions, or staying in poor regions of
algorithm space. Whenever phase transitions occur, the sequence of appearances
are the same. We identify combinations of variables and operators which are
useful in measuring experience or performance in rule extraction and can thus
implement useful annealing of the learning schedule.
|
[{'version': 'v1', 'created': 'Wed, 11 Sep 2002 18:52:04 GMT'}]
|
2009-11-07
|
[array(['Neirotti', 'Juan Pablo', ''], dtype=object)
array(['Caticha', 'Nestor', ''], dtype=object)]
|
4,624 |
1704.05486
|
Arnaud Marsiglietti
|
Matthieu Fradelizi, Mokshay Madiman, Arnaud Marsiglietti, Artem
Zvavitch
|
The convexification effect of Minkowski summation
|
60 pages, 7 figures. v2: Title changed. v3: Added Section 7.2
resolving Dyn-Farkhi conjecture
|
EMS Surveys in Mathematical Sciences, 2018
|
10.4171/EMSS/26
| null |
math.FA math.MG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Let us define for a compact set $A \subset \mathbb{R}^n$ the sequence $$ A(k)
= \left\{\frac{a_1+\cdots +a_k}{k}: a_1, \ldots, a_k\in
A\right\}=\frac{1}{k}\Big(\underset{k\ {\rm times}}{\underbrace{A + \cdots +
A}}\Big). $$ It was independently proved by Shapley, Folkman and Starr (1969)
and by Emerson and Greenleaf (1969) that $A(k)$ approaches the convex hull of
$A$ in the Hausdorff distance induced by the Euclidean norm as $k$ goes to
$\infty$. We explore in this survey how exactly $A(k)$ approaches the convex
hull of $A$, and more generally, how a Minkowski sum of possibly different
compact sets approaches convexity, as measured by various indices of
non-convexity. The non-convexity indices considered include the Hausdorff
distance induced by any norm on $\mathbb{R}^n$, the volume deficit (the
difference of volumes), a non-convexity index introduced by Schneider (1975),
and the effective standard deviation or inner radius. After first clarifying
the interrelationships between these various indices of non-convexity, which
were previously either unknown or scattered in the literature, we show that the
volume deficit of $A(k)$ does not monotonically decrease to 0 in dimension 12
or above, thus falsifying a conjecture of Bobkov et al. (2011), even though
their conjecture is proved to be true in dimension 1 and for certain sets $A$
with special structure. On the other hand, Schneider's index possesses a strong
monotonicity property along the sequence $A(k)$, and both the Hausdorff
distance and effective standard deviation are eventually monotone (once $k$
exceeds $n$). Along the way, we obtain new inequalities for the volume of the
Minkowski sum of compact sets, falsify a conjecture of Dyn and Farkhi (2004),
demonstrate applications of our results to combinatorial discrepancy theory,
and suggest some questions worthy of further investigation.
|
[{'version': 'v1', 'created': 'Tue, 18 Apr 2017 18:21:20 GMT'}
{'version': 'v2', 'created': 'Wed, 24 May 2017 16:19:27 GMT'}
{'version': 'v3', 'created': 'Wed, 16 May 2018 16:13:36 GMT'}]
|
2018-06-27
|
[array(['Fradelizi', 'Matthieu', ''], dtype=object)
array(['Madiman', 'Mokshay', ''], dtype=object)
array(['Marsiglietti', 'Arnaud', ''], dtype=object)
array(['Zvavitch', 'Artem', ''], dtype=object)]
|
4,625 |
1802.09566
|
Mudasir Ahmad Wani
|
Mudasir Ahmad Wani, Nancy Agarwal, Suraiya Jabin, Syed Zeeshan Hussai
|
Design of iMacros-based Data Crawler and the Behavioral Analysis of
Facebook Users
| null | null | null | null |
cs.SI cs.HC cs.IR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Obtaining the desired dataset is still a prime challenge faced by researchers
while analyzing Online Social Network (OSN) sites. Application Programming
Interfaces (APIs) provided by OSN service providers for retrieving data impose
several unavoidable restrictions which make it difficult to get a desirable
dataset. In this paper, we present an iMacros technology-based data crawler
called IMcrawler, capable of collecting every piece of information which is
accessible through a browser from the Facebook website within the legal
framework which permits access to publicly shared user content on OSNs. The
proposed crawler addresses most of the challenges allied with web data
extraction approaches and most of the APIs provided by OSN service providers.
Two broad sections have been extracted from Facebook user profiles, namely,
Personal Information and Wall Activities. The present work is the first attempt
towards providing the detailed description of crawler design for the Facebook
website.
|
[{'version': 'v1', 'created': 'Sun, 18 Feb 2018 18:36:46 GMT'}
{'version': 'v2', 'created': 'Tue, 26 Nov 2019 11:16:01 GMT'}]
|
2019-11-27
|
[array(['Wani', 'Mudasir Ahmad', ''], dtype=object)
array(['Agarwal', 'Nancy', ''], dtype=object)
array(['Jabin', 'Suraiya', ''], dtype=object)
array(['Hussai', 'Syed Zeeshan', ''], dtype=object)]
|
4,626 |
1003.1116
|
Vladimir Yedynak
|
Vladimir V. Yedynak
|
Order separability
|
4 pages. This work was published in the Bulletin of Moscow State
University in 2006
| null | null | null |
math.GR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper is devoted to the investigation of the property of order
separability for free products of groups.
|
[{'version': 'v1', 'created': 'Thu, 4 Mar 2010 19:35:56 GMT'}
{'version': 'v2', 'created': 'Tue, 13 Jul 2010 11:40:40 GMT'}
{'version': 'v3', 'created': 'Tue, 20 Jul 2010 11:42:52 GMT'}]
|
2010-07-21
|
[array(['Yedynak', 'Vladimir V.', ''], dtype=object)]
|
4,627 |
2005.00391
|
Daniel Boyanovsky
|
Nathan Herring, Daniel Boyanovsky
|
Gravitational production of nearly thermal fermionic Dark Matter
|
Published version. Includes majoranas and pair annihilation into
gravitons
|
Phys. Rev. D 101, 123522 (2020)
|
10.1103/PhysRevD.101.123522
| null |
astro-ph.CO gr-qc hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the cosmological production of fermionic dark matter during
inflation and a post-inflationary radiation dominated era. This fermion
\emph{only interacts gravitationally}, has a mass $m$ much smaller than the
Hubble scale during inflation (but is otherwise arbitrary) and is in its
Bunch-Davies vacuum state during inflation. We focus on superhorizon modes at
the end of inflation, and assume instantaneous reheating. We obtain the full
energy momentum tensor discussing its renormalization, and show that the
contribution from particle production is of the kinetic-fluid form near
matter-radiation equality. We find \emph{exactly} the distribution function of
produced particles
$|B(k)|^2=\frac{1}{2}\Big[1-(1-e^{-\frac{k^2}{2mT_H}})^{1/2}\Big]$ which
exhibits an " emergent temperature" $T_H=H_0\sqrt{\Omega_R}\simeq
10^{-36}(\mathrm{eV})$. The abundance of the produced particles $\Omega_{pp}$
is very similar to that of a non-relativistic degree of freedom thermalized at
temperature $T_H$, $\Omega_{pp} \propto m \, (m\,T_H)^{3/2}\simeq
\big(m/10^8\mathrm{GeV})\big)^{5/2}$ and "cold" equation of state $w(a) \simeq
(T_H/m a^2)$, both dominated by superhorizon modes at the end of inflation. We
discuss subtle aspects of isocurvature perturbations.
|
[{'version': 'v1', 'created': 'Fri, 1 May 2020 14:15:02 GMT'}
{'version': 'v2', 'created': 'Fri, 19 Jun 2020 20:00:40 GMT'}]
|
2020-06-23
|
[array(['Herring', 'Nathan', ''], dtype=object)
array(['Boyanovsky', 'Daniel', ''], dtype=object)]
|
4,628 |
1804.03359
|
Ievgen Makedonskyi
|
Evgeny Feigin and Ievgen Makedonskyi
|
Vertex algebras and coordinate rings of semi-infinite flags
| null | null |
10.1007/s00220-019-03321-x
| null |
math.RT math-ph math.AG math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The direct sum of irreducible level one integrable representations of affine
Kac-Moody Lie algebra of (affine) type $ADE$ carries a structure of
$P/Q$-graded vertex operator algebra. There exists a filtration on this direct
sum studied by Kato and Loktev such that the corresponding graded vector space
is a direct sum of global Weyl modules. The associated graded space with
respect to the dual filtration is isomorphic to the homogenous coordinate ring
of semi-infinite flag variety. We describe the ring structure in terms of
vertex operators and endow the homogenous coordinate ring with a structure of
$P/Q$-graded vertex operator algebra. We use the vertex algebra approach to
derive semi-infinite Pl\"ucker-type relations in the homogeneous coordinate
ring.
|
[{'version': 'v1', 'created': 'Tue, 10 Apr 2018 06:28:42 GMT'}]
|
2019-02-20
|
[array(['Feigin', 'Evgeny', ''], dtype=object)
array(['Makedonskyi', 'Ievgen', ''], dtype=object)]
|
4,629 |
1509.07926
|
Matthew Mower
|
Matthew D. Mower and G. Vignale
|
Spin relaxation near a ferromagnetic transition
|
12 pages, 5 figures
| null | null | null |
cond-mat.mes-hall cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study spin relaxation in dilute magnetic semiconductors near a
ferromagnetic transition, where spin fluctuations become strong. An enhancement
in the scattering rate of itinerant carriers from the spin fluctuations of
localized impurities leads to a change in the dominant spin relaxation
mechanism from Dyakonov-Perel to spin flips in scattering. On the ferromagnetic
side of the transition, we show that due to the presence of two magnetic
components -- the itinerant carriers and the magnetic impurities -- with
different gyromagnetic ratios, the relaxation rate of the total magnetization
can be quite different from the relaxation rate of the spin. Following a
disturbance of the equilibrium magnetization, the spin is initially
redistributed between the two components to restore the equilibrium
magnetization. It is only on a longer time scale, controlled by the spin-orbit
interaction, that the total spin itself relaxes to its equilibrium state.
|
[{'version': 'v1', 'created': 'Sat, 26 Sep 2015 00:14:41 GMT'}]
|
2015-09-29
|
[array(['Mower', 'Matthew D.', ''], dtype=object)
array(['Vignale', 'G.', ''], dtype=object)]
|
4,630 |
quant-ph/0411132
|
Wei Lianfu
|
L.F. Wei and Franco Nori
|
Coherently manipulating two-qubit quantum information using a pair of
simultaneous laser pulses
| null |
Europhys. Lett., 65(1), 1 (2004)
|
10.1209/epl/i2003-10053-y
| null |
quant-ph
| null |
Several sequential operations are usually needed for implementing controlled
quantum gates and generating entanglement between a pair of quantum bits. Based
on the conditional quantum dynamics for a two-ion system beyond the Lamb-Dicke
limit, here we propose a theoretical scheme for manipulating two-qubit quantum
information, i.e., implementing a universal two-qubit quantum gate and
generating a two-qubit entangled state, by using a pair of simultaneous laser
pulses. Neither the Lamb-Dicke approximation nor the auxiliary atomic level are
required. The experimental realizability of this simple approach is also
discussed.
|
[{'version': 'v1', 'created': 'Thu, 18 Nov 2004 09:03:06 GMT'}
{'version': 'v2', 'created': 'Mon, 19 Dec 2005 08:23:25 GMT'}]
|
2009-11-10
|
[array(['Wei', 'L. F.', ''], dtype=object)
array(['Nori', 'Franco', ''], dtype=object)]
|
4,631 |
1303.1528
|
Kent Yagi
|
Kent Yagi and Nicolas Yunes
|
I-Love-Q Relations in Neutron Stars and their Applications to
Astrophysics, Gravitational Waves and Fundamental Physics
|
29 pages, 16 figures; typos corrected
|
Phys. Rev. D 88, 023009 (2013)
|
10.1103/PhysRevD.88.023009
| null |
gr-qc astro-ph.HE hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The exterior gravitational field of a slowly-rotating neutron star can be
characterized by its multipole moments, the first few being the neutron star
mass, moment of inertia, and quadrupole moment to quadratic order in spin. In
principle, all of these quantities depend on the neutron star's internal
structure, and thus, on unknown nuclear physics at supra-nuclear energy
densities. We here find relations between the moment of inertia, the Love
numbers and the quadrupole moment (I-Love-Q relations) that do not depend
sensitively on the neutron star's internal structure. Three important
consequences derive from these I-Love-Q relations. On an observational
astrophysics front, the measurement of a single member of the I-Love-Q trio
would automatically provide information about the other two, even when the
latter may not be observationally accessible. On a gravitational wave front,
the I-Love-Q relations break the degeneracy between the quadrupole moment and
the neutron-star spins in binary inspiral waveforms, allowing second-generation
ground-based detectors to determine the (dimensionless) averaged spin to
$\mathcal{O}(10)%$, given a sufficiently large signal-to-noise ratio detection.
On a fundamental physics front, the I-Love-Q relations allow for tests of
General Relativity in the neutron-star strong-field that are both theory- and
internal structure-independent. As an example, by combining gravitational-wave
and electromagnetic observations, one may constrain dynamical Chern-Simons
gravity in the future by more than 6 orders of magnitude more stringently than
Solar System and table-top constraints.
|
[{'version': 'v1', 'created': 'Wed, 6 Mar 2013 21:00:03 GMT'}
{'version': 'v2', 'created': 'Mon, 9 Sep 2013 03:46:03 GMT'}
{'version': 'v3', 'created': 'Thu, 30 Nov 2017 16:53:50 GMT'}]
|
2017-12-01
|
[array(['Yagi', 'Kent', ''], dtype=object)
array(['Yunes', 'Nicolas', ''], dtype=object)]
|
4,632 |
math/0403083
|
Yong-Geun Oh
|
Yong-Geun Oh
|
Spectral invariants, analysis of the Floer moduli spaces and geometry of
the Hamiltonian diffeomorphism group
|
78 pages, This the final version that will appear in Duke Math. J.
published by Duke University Press
|
Duke Math. J. 130 (2005) , no2, 199-295
| null | null |
math.SG
| null |
In this paper, we apply spectral invariants, constructed in [Oh5,8], to the
study of Hamiltonian diffeomorphisms of closed symplectic manifolds
$(M,\omega)$. Using spectral invariants, we first construct an invariant norm
called the {\it spectral norm} on the Hamiltonian diffeomorphism group and
obtain several lower bounds for the spectral norm in terms of the
$\e$-regularity theorem and the symplectic area of certain pseudo-holomorphic
curves. We then apply spectral invariants to the study of length minimizing
properties of certain Hamiltonian paths {\it among all paths}. In addition to
the construction of spectral invariants, these applications rely heavily on the
{\it chain level Floer theory} and on some existence theorems with energy
bounds of pseudo-holomorphic sections of certain Hamiltonian fibrations with
prescribed monodromy. The existence scheme that we develop in this paper in
turn relies on some careful geometric analysis involving {\it adiabatic
degeneration} and {\it thick-thin decomposition} of the Floer moduli spaces
which has an independent interest of its own.
We assume that $(M,\omega)$ is {\it strongly semi-positive} throughout, which
will be removed in a sequel.
|
[{'version': 'v1', 'created': 'Wed, 3 Mar 2004 20:32:33 GMT'}
{'version': 'v2', 'created': 'Tue, 4 May 2004 19:04:38 GMT'}
{'version': 'v3', 'created': 'Sat, 26 Jun 2004 00:51:44 GMT'}
{'version': 'v4', 'created': 'Sat, 19 Feb 2005 03:10:23 GMT'}]
|
2007-05-23
|
[array(['Oh', 'Yong-Geun', ''], dtype=object)]
|
4,633 |
1806.05649
|
Gennaro D'Angelo Dr.
|
Gennaro D'Angelo and Jack J. Lissauer
|
Formation of Giant Planets
|
Invited review, accepted for publication in the "Handbook of
Exoplanets", eds. H.J. Deeg and J.A. Belmonte, Springer (2018). 28 pages, 8
figures
| null |
10.1007/978-3-319-55333-7_140
|
LA-UR-18-23469
|
astro-ph.EP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Giant planets are tens to thousands of times as massive as the Earth, and
many times as large. Most of their volumes are occupied by hydrogen and helium,
the primary constituents of the protostellar disks from which they formed.
Significantly, the solar system giants are also highly enriched in heavier
elements relative to the Sun, indicating that solid material participated in
their assembly. Giant planets account for most of the mass of our planetary
system and of those extrasolar planetary systems in which they are present.
Therefore, giant planets are primary actors in determining the orbital
architectures of planetary systems and, possibly, in affecting the composition
of terrestrial planets. This Chapter describes the principal route that,
according to current knowledge, can lead to the formation of giant planets, the
core nucleated accretion model, and an alternative route, the disk instability
model, which may lead to the formation of planetary-mass objects on wide
orbits.
|
[{'version': 'v1', 'created': 'Thu, 14 Jun 2018 17:04:28 GMT'}]
|
2018-12-05
|
[array(["D'Angelo", 'Gennaro', ''], dtype=object)
array(['Lissauer', 'Jack J.', ''], dtype=object)]
|
4,634 |
hep-th/0402115
|
Ho-Ung Yee
|
Ho-Ung Yee (KIAS)
|
A Note on AdS/CFT Dual of SL(2,Z) Action on 3D Conformal Field Theories
with U(1) Symmetry
|
LaTex, 1+15 pages, 1 figure, v2: discussion in terms of deformation
theory is added
|
Phys.Lett. B598 (2004) 139-148
|
10.1016/j.physletb.2004.05.082
| null |
hep-th
| null |
In this letter, we elaborate on the SL(2,Z) action on three dimensional
conformal field theories with U(1) symmetry introduced by Witten, by trying to
give an explicit verification of the claim regarding holographic dual of the S
operation in AdS/CFT correspondence. A consistency check with the recently
proposed prescription on boundary condition of bulk fields when we deform the
boundary CFT in a non-standard manner is also discussed.
|
[{'version': 'v1', 'created': 'Mon, 16 Feb 2004 12:52:58 GMT'}
{'version': 'v2', 'created': 'Fri, 12 Nov 2004 12:44:03 GMT'}]
|
2009-11-10
|
[array(['Yee', 'Ho-Ung', '', 'KIAS'], dtype=object)]
|
4,635 |
2201.07553
|
Sophie Huczynska
|
Sophie Huczynska and Laura Johnson
|
Internal and external partial difference families and cyclotomy
| null | null | null | null |
math.CO
|
http://creativecommons.org/licenses/by/4.0/
|
We introduce the concept of a disjoint partial difference family (DPDF) and
an external partial difference family (EPDF), a natural generalisation of the
much-studied structures of disjoint difference family (DDF), external
difference family (EDF) and partial difference set (PDS). We establish
properties and constructions, and indicate connections to other
recently-studied combinatorial structures. We show how DPDFs and EPDFs may be
formed from collections of PDSs, and also present cyclotomic methods yielding
DPDFs and EPDFs whose component sets are not in general PDSs. As part of this,
we develop a unified framework encompassing various known constructions for
cyclotomic difference structures, which also yields new results on DDFs and
EDFs.
|
[{'version': 'v1', 'created': 'Wed, 19 Jan 2022 12:12:18 GMT'}
{'version': 'v2', 'created': 'Thu, 15 Sep 2022 11:08:41 GMT'}
{'version': 'v3', 'created': 'Tue, 20 Dec 2022 09:54:28 GMT'}]
|
2022-12-21
|
[array(['Huczynska', 'Sophie', ''], dtype=object)
array(['Johnson', 'Laura', ''], dtype=object)]
|
4,636 |
2009.03527
|
Yuanyu Wan
|
Yuanyu Wan and Lijun Zhang
|
Approximate Multiplication of Sparse Matrices with Limited Space
| null | null | null | null |
cs.LG stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Approximate matrix multiplication with limited space has received
ever-increasing attention due to the emergence of large-scale applications.
Recently, based on a popular matrix sketching algorithm---frequent directions,
previous work has introduced co-occuring directions (COD) to reduce the
approximation error for this problem. Although it enjoys the space complexity
of $O((m_x+m_y)\ell)$ for two input matrices $X\in\mathbb{R}^{m_x\times n}$ and
$Y\in\mathbb{R}^{m_y\times n}$ where $\ell$ is the sketch size, its time
complexity is $O\left(n(m_x+m_y+\ell)\ell\right)$, which is still very high for
large input matrices. In this paper, we propose to reduce the time complexity
by exploiting the sparsity of the input matrices. The key idea is to employ an
approximate singular value decomposition (SVD) method which can utilize the
sparsity, to reduce the number of QR decompositions required by COD. In this
way, we develop sparse co-occuring directions, which reduces the time
complexity to $\widetilde{O}\left((\nnz(X)+\nnz(Y))\ell+n\ell^2\right)$ in
expectation while keeps the same space complexity as $O((m_x+m_y)\ell)$, where
$\nnz(X)$ denotes the number of non-zero entries in $X$. Theoretical analysis
reveals that the approximation error of our algorithm is almost the same as
that of COD. Furthermore, we empirically verify the efficiency and
effectiveness of our algorithm.
|
[{'version': 'v1', 'created': 'Tue, 8 Sep 2020 05:39:19 GMT'}]
|
2020-09-09
|
[array(['Wan', 'Yuanyu', ''], dtype=object)
array(['Zhang', 'Lijun', ''], dtype=object)]
|
4,637 |
2207.12981
|
Klaas Wiersema
|
K. Wiersema, P. Chote, J. Marchant, S. Covino, J. R. Maund, A.
Agathanggelou, W. Feline, S. George, G. Privett, B. Simmons, I. A. Steele
|
Short timescale imaging polarimetry of geostationary satellite Thor-6:
the nature of micro-glints
|
6 figures, 30 pages; accepted for publication in Advances in Space
Research
| null |
10.1016/j.asr.2022.07.034
| null |
astro-ph.EP astro-ph.IM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Large constellations of orbiting communication satellites will become an
important source of noise for present and future astronomical observatories.
Mitigation measures rely on high quality predictive models of the position and
expected brightness of these objects. Optical linear imaging polarimetry holds
promise as a quantitative tool to improve our understanding of the physics of
reflection of sunlight off satellite components and through which models of
expected brightness can be improved. We present the first simultaneous
short-timescale linear polarimetry and optical photometry observations of a
geostationary satellite, using the new MOPTOP imaging polarimeter on the 2m
Liverpool Telescope. Our target, telecommunication satellite Thor-6, shows
prominent short timescale glint-like features in the lightcurve, some as short
as seconds. Our polarimetric observations overlap with several of these
micro-glints, and have the cadence required to resolve them. We find that the
polarisation lightcurve is remarkably smooth, the short time scale glints are
not seen to produce strong polarimetric features in our observation. We show
how short timescale polarimetry can further constrain the properties of the
components responsible for these micro-glints.
|
[{'version': 'v1', 'created': 'Tue, 26 Jul 2022 15:40:48 GMT'}]
|
2022-07-27
|
[array(['Wiersema', 'K.', ''], dtype=object)
array(['Chote', 'P.', ''], dtype=object)
array(['Marchant', 'J.', ''], dtype=object)
array(['Covino', 'S.', ''], dtype=object)
array(['Maund', 'J. R.', ''], dtype=object)
array(['Agathanggelou', 'A.', ''], dtype=object)
array(['Feline', 'W.', ''], dtype=object)
array(['George', 'S.', ''], dtype=object)
array(['Privett', 'G.', ''], dtype=object)
array(['Simmons', 'B.', ''], dtype=object)
array(['Steele', 'I. A.', ''], dtype=object)]
|
4,638 |
2012.10919
|
Antoine Vigneron
|
Corentin Allair and Antoine Vigneron
|
Pattern Matching in Doubling Spaces
|
23 pages, 4 figures
| null | null | null |
cs.DS cs.CG
|
http://creativecommons.org/licenses/by/4.0/
|
We consider the problem of matching a metric space $(X,d_X)$ of size $k$ with
a subspace of a metric space $(Y,d_Y)$ of size $n \geq k$, assuming that these
two spaces have constant doubling dimension $\delta$. More precisely, given an
input parameter $\rho \geq 1$, the $\rho$-distortion problem is to find a
one-to-one mapping from $X$ to $Y$ that distorts distances by a factor at most
$\rho$. We first show by a reduction from $k$-clique that, in doubling
dimension $\log_2 3$, this problem is NP-hard and W[1]-hard. Then we provide a
near-linear time approximation algorithm for fixed $k$: Given an approximation
ratio $0<\varepsilon\leq 1$, and a positive instance of the $\rho$-distortion
problem, our algorithm returns a solution to the
$(1+\varepsilon)\rho$-distortion problem in time $(\rho/\varepsilon)^{O(1)}n
\log n$. We also show how to extend these results to the minimum distortion
problem in doubling spaces: We prove the same hardness results, and for fixed
$k$, we give a $(1+\varepsilon)$-approximation algorithm running in time
$($dist$(X,Y)/\varepsilon)^{O(1)}n^2\log n$, where dist$(X,Y)$ denotes the
minimum distortion between $X$ and $Y$.
|
[{'version': 'v1', 'created': 'Sun, 20 Dec 2020 13:33:41 GMT'}]
|
2020-12-22
|
[array(['Allair', 'Corentin', ''], dtype=object)
array(['Vigneron', 'Antoine', ''], dtype=object)]
|
4,639 |
astro-ph/9711308
|
Chun-Yu Ma
|
Chun-yu Ma (1,2) and Peter L Biermann (2) ((1) Purple Mountain
Observatory, Nanjing, China, (2) MPIfR, Bonn, Germany)
|
On the dynamo driven accretion disks
|
19 pages, 5 eps figures, uses aasms4.sty, accepted to A&A
| null | null | null |
astro-ph
| null |
We add the $\alpha-$ effect in the dynamo driven accretion disk model
proposed by Tout & Pringle (1992), i.e., a dynamo model depends on the physical
processes such as Parker instability, Balbus-Hawley instability, magnetic field
reconnection and $\alpha-\omega$ mean field dynamo as well. The $\alpha-$
effect in the dynamo mechanism is determined by the strength of turbulence of
the accretion flow. When the turbulent Mach number $M_t$ is less than 0.25, the
solutions of the magnetic fields oscillate around their equilibrium values. The
increase of the value of $M_t$ makes the amplitude of the oscillation smaller
and the period longer, but does not affect the equilibrium values. The
Shakura-Sunyaev viscosity parameter $\alpha_{SS}$ oscillates around the
equilibrium value of 0.33. When the turbulent Mach number $M_t$ is larger than
0.25, the magnetic field components reach a stable state. In the non-linear
dynamo region, the critical turbulent Mach number $M_t$ is 0.44 rather than
0.25. The oscillating magnetic fields and viscosity parameter can explain the
basic properties of the dwarf nova eruptions and some properties of quiescent
disks (Armitage et al. 1996).
|
[{'version': 'v1', 'created': 'Wed, 26 Nov 1997 01:17:26 GMT'}]
|
2007-05-23
|
[array(['Ma', 'Chun-yu', ''], dtype=object)
array(['Biermann', 'Peter L', ''], dtype=object)]
|
4,640 |
hep-th/0006203
|
Ichiro Oda
|
Ichiro Oda
|
Localization of Matters on a String-like Defect
|
15 pages, LaTex 2e, minor corrections (to appear in Phys. Lett. B)
|
Phys.Lett.B496:113-121,2000
|
10.1016/S0370-2693(00)01284-3
|
EDO-EP-30
|
hep-th
| null |
After presenting string-like solutions with a warp factor to Einstein's
equations, we study localization of various spin fields on a string-like defect
in a general space-time dimension from the viewpoint of field theory. It is
shown that spin 0 and 2 fields are localized on a defect with the exponentially
decreasing warp factor. Spin 1 field can be also localized on a defect with the
exponentially decreasing warp factor. On the other hand, spin one-half and
three-half fields can be localized on a defect with the exponentially
increasing warp factor, provided that additional interactions are not
introduced. Thus, some mechanism of localization must be invoked for these
fermionic fields. These results are very similar to those of a domain wall in
five space-time dimensions except the case of spin 1 field.
|
[{'version': 'v1', 'created': 'Mon, 26 Jun 2000 19:57:25 GMT'}
{'version': 'v2', 'created': 'Wed, 1 Nov 2000 01:36:46 GMT'}]
|
2011-05-05
|
[array(['Oda', 'Ichiro', ''], dtype=object)]
|
4,641 |
0809.4631
|
Dung Di Caprio
|
D. di Caprio, J.P. Badiali, M. Holovko
|
Simple field theoretical approach of Coulomb systems. Entropic effects
|
4 pages, 1 figure
| null | null | null |
cond-mat.stat-mech cond-mat.soft
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss a new simple field theory approach of Coulomb systems. Using a
description in terms of fields, we introduce in a new way the statistical
degrees of freedom in relation with the quantum mechanics. We show on a series
of examples that these fundamental entropic effects can help account for
physical phenomena in relation with Coulomb systems whether symmetric or also
asymmetric in valence. On the overall, this gives a new understanding of these
systems.
|
[{'version': 'v1', 'created': 'Fri, 26 Sep 2008 13:40:41 GMT'}]
|
2008-09-29
|
[array(['di Caprio', 'D.', ''], dtype=object)
array(['Badiali', 'J. P.', ''], dtype=object)
array(['Holovko', 'M.', ''], dtype=object)]
|
4,642 |
2305.05974
|
Prabhu Babu Dr.
|
Petre Stoica and Prabhu Babu
|
Pearson-Matthews correlation coefficients for binary and multinary
classification and hypothesis testing
| null | null | null | null |
eess.SP stat.ML
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
The Pearson-Matthews correlation coefficient (usually abbreviated MCC) is
considered to be one of the most useful metrics for the performance of a binary
classification or hypothesis testing method (for the sake of conciseness we
will use the classification terminology throughout, but the concepts and
methods discussed in the paper apply verbatim to hypothesis testing as well).
For multinary classification tasks (with more than two classes) the existing
extension of MCC, commonly called the $\text{R}_{\text{K}}$ metric, has also
been successfully used in many applications. The present paper begins with an
introductory discussion on certain aspects of MCC. Then we go on to discuss the
topic of multinary classification that is the main focus of this paper and
which, despite its practical and theoretical importance, appears to be less
developed than the topic of binary classification. Our discussion of the
$\text{R}_{\text{K}}$ is followed by the introduction of two other metrics for
multinary classification derived from the multivariate Pearson correlation
(MPC) coefficients. We show that both $\text{R}_{\text{K}}$ and the MPC metrics
suffer from the problem of not decisively indicating poor classification
results when they should, and introduce three new enhanced metrics that do not
suffer from this problem. We also present an additional new metric for
multinary classification which can be viewed as a direct extension of MCC.
|
[{'version': 'v1', 'created': 'Wed, 10 May 2023 08:32:36 GMT'}]
|
2023-05-11
|
[array(['Stoica', 'Petre', ''], dtype=object)
array(['Babu', 'Prabhu', ''], dtype=object)]
|
4,643 |
2110.02907
|
Mengyu Fu
|
Mengyu Fu, Kiril Solovey, Oren Salzman, and Ron Alterovitz
|
Resolution-Optimal Motion Planning for Steerable Needles
|
arXiv admin note: text overlap with arXiv:2107.04939; to be published
in ICRA 2022
| null | null | null |
cs.RO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Medical steerable needles can follow 3D curvilinear trajectories inside body
tissue, enabling them to move around critical anatomical structures and
precisely reach clinically significant targets in a minimally invasive way.
Automating needle steering, with motion planning as a key component, has the
potential to maximize the accuracy, precision, speed, and safety of steerable
needle procedures. In this paper, we introduce the first resolution-optimal
motion planner for steerable needles that offers excellent practical
performance in terms of runtime while simultaneously providing strong
theoretical guarantees on completeness and the global optimality of the motion
plan in finite time. Compared to state-of-the-art steerable needle motion
planners, simulation experiments on realistic scenarios of lung biopsy
demonstrate that our proposed planner is faster in generating higher-quality
plans while incorporating clinically relevant cost functions. This indicates
that the theoretical guarantees of the proposed planner have a practical impact
on the motion plan quality, which is valuable for computing motion plans that
minimize patient trauma.
|
[{'version': 'v1', 'created': 'Wed, 6 Oct 2021 16:36:02 GMT'}
{'version': 'v2', 'created': 'Mon, 28 Feb 2022 13:50:51 GMT'}]
|
2022-03-01
|
[array(['Fu', 'Mengyu', ''], dtype=object)
array(['Solovey', 'Kiril', ''], dtype=object)
array(['Salzman', 'Oren', ''], dtype=object)
array(['Alterovitz', 'Ron', ''], dtype=object)]
|
4,644 |
2202.11369
|
Manil T Mohan
|
Kush Kinra and Manil T. Mohan
|
Wong-Zakai approximation and support theorem for 2D and 3D stochastic
convective Brinkman-Forchheimer equations
| null | null | null | null |
math.PR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we demonstrate the Wong-Zakai approximation results for two and
three dimensional stochastic convective Brinkman-Forchheimer (SCBF) equations
forced by Hilbert space valued Wiener noise on bounded domains. Even though the
existence and uniqueness of a pathwise strong solution to SCBF equations is
known, the existence of a unique solution to the approximating system is not
immediate from the solvability results of SCBF equations, and we prove it by
using Faedo-Galerkin approximation technique and monotonicity arguments.
Moreover, as an application of the Wong-Zakai approximation, we obtain the
support of the distribution of solutions to SCBF equations.
|
[{'version': 'v1', 'created': 'Wed, 23 Feb 2022 09:21:34 GMT'}]
|
2022-02-24
|
[array(['Kinra', 'Kush', ''], dtype=object)
array(['Mohan', 'Manil T.', ''], dtype=object)]
|
4,645 |
1203.0874
|
Antoine Hakassou
|
Antoine Hakassou and Youssef Ouknine
|
A note on $\alpha$-IDT processes
| null | null | null | null |
math.PR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this note, we introduce the notion of $\alpha$-IDT processes which is
obtained from a slight and fundamental modification of the IDT property.
Several examples of $\alpha$-IDT processes are given and Gaussian processes
which are $\alpha$-IDT are characterized. A kind example of this Gaussian
$\alpha$-IDT is the standard fractional Brownian motion. Also, we invest some
links between the $\alpha$-IDT property, with selfdecomposability, temporal
selfdecomposability, stability and self similarity.
|
[{'version': 'v1', 'created': 'Mon, 5 Mar 2012 11:56:09 GMT'}
{'version': 'v2', 'created': 'Thu, 11 Oct 2012 13:55:36 GMT'}
{'version': 'v3', 'created': 'Tue, 16 Oct 2012 19:41:26 GMT'}]
|
2012-10-17
|
[array(['Hakassou', 'Antoine', ''], dtype=object)
array(['Ouknine', 'Youssef', ''], dtype=object)]
|
4,646 |
1504.00507
|
Gabriele Gradoni
|
Gabriele Gradoni and Stephen Creagh and Gregor Tanner and Christopher
Smartt and David Thomas
|
A Phase-Space Approach for Propagating Field-Field Correlation Functions
|
11 pages, 13 figures, under review in Physical Review E
| null |
10.1088/1367-2630/17/9/093027
| null |
nlin.CD
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that radiation from complex and inherently random but correlated wave
sources can be modelled efficiently by using an approach based on the Wigner
distribution function. Our method exploits the connection between correlation
functions and theWigner function and admits in its simplest approximation a
direct representation in terms of the evolution of ray densities in phase
space. We show that next leading order corrections to the ray-tracing
approximation lead to Airy-function type phase space propagators. By exploiting
the exact Wigner function propagator, inherently wave-like effects such as
evanescent decay or radiation from more heterogeneous sources as well as
diffraction and reflections can be included and analysed. We discuss in
particular the role of evanescent waves in the near-field of non-paraxial
sources and give explicit expressions for the growth rate of the correlation
length as function of the distance from the source. Furthermore, results for
the reflection of partially coherent sources from flat mirrors are given. We
focus here on electromagnetic sources at microwave frequencies and modelling
efforts in the context of electromagnetic compatibility.
|
[{'version': 'v1', 'created': 'Thu, 2 Apr 2015 10:53:03 GMT'}]
|
2015-09-30
|
[array(['Gradoni', 'Gabriele', ''], dtype=object)
array(['Creagh', 'Stephen', ''], dtype=object)
array(['Tanner', 'Gregor', ''], dtype=object)
array(['Smartt', 'Christopher', ''], dtype=object)
array(['Thomas', 'David', ''], dtype=object)]
|
4,647 |
1905.06641
|
Lumin Liu
|
Lumin Liu, Jun Zhang, S. H. Song, Khaled B. Letaief
|
Client-Edge-Cloud Hierarchical Federated Learning
|
6 pages, 4 figures
| null | null | null |
cs.NI cs.LG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Federated Learning is a collaborative machine learning framework to train a
deep learning model without accessing clients' private data. Previous works
assume one central parameter server either at the cloud or at the edge. The
cloud server can access more data but with excessive communication overhead and
long latency, while the edge server enjoys more efficient communications with
the clients. To combine their advantages, we propose a client-edge-cloud
hierarchical Federated Learning system, supported with a HierFAVG algorithm
that allows multiple edge servers to perform partial model aggregation. In this
way, the model can be trained faster and better communication-computation
trade-offs can be achieved. Convergence analysis is provided for HierFAVG and
the effects of key parameters are also investigated, which lead to qualitative
design guidelines. Empirical experiments verify the analysis and demonstrate
the benefits of this hierarchical architecture in different data distribution
scenarios. Particularly, it is shown that by introducing the intermediate edge
servers, the model training time and the energy consumption of the end devices
can be simultaneously reduced compared to cloud-based Federated Learning.
|
[{'version': 'v1', 'created': 'Thu, 16 May 2019 10:23:36 GMT'}
{'version': 'v2', 'created': 'Thu, 31 Oct 2019 14:45:01 GMT'}]
|
2019-11-01
|
[array(['Liu', 'Lumin', ''], dtype=object)
array(['Zhang', 'Jun', ''], dtype=object)
array(['Song', 'S. H.', ''], dtype=object)
array(['Letaief', 'Khaled B.', ''], dtype=object)]
|
4,648 |
2103.10229
|
Gabriel Dias Cantareira
|
Gabriel D. Cantareira, Rodrigo F. Mello, Fernando V. Paulovich
|
Explainable Adversarial Attacks in Deep Neural Networks Using Activation
Profiles
|
Submitted to EUROVIS 2021
| null | null | null |
cs.LG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
As neural networks become the tool of choice to solve an increasing variety
of problems in our society, adversarial attacks become critical. The
possibility of generating data instances deliberately designed to fool a
network's analysis can have disastrous consequences. Recent work has shown that
commonly used methods for model training often result in fragile abstract
representations that are particularly vulnerable to such attacks. This paper
presents a visual framework to investigate neural network models subjected to
adversarial examples, revealing how models' perception of the adversarial data
differs from regular data instances and their relationships with class
perception. Through different use cases, we show how observing these elements
can quickly pinpoint exploited areas in a model, allowing further study of
vulnerable features in input data and serving as a guide to improving model
training and architecture.
|
[{'version': 'v1', 'created': 'Thu, 18 Mar 2021 13:04:21 GMT'}]
|
2021-03-19
|
[array(['Cantareira', 'Gabriel D.', ''], dtype=object)
array(['Mello', 'Rodrigo F.', ''], dtype=object)
array(['Paulovich', 'Fernando V.', ''], dtype=object)]
|
4,649 |
1008.3740
|
ChungYeol Ryu
|
C.Y.Ryu, K.S.Kim and Myung-Ki Cheoun
|
Medium effects of magnetic moments of baryons on neutron stars under
strong magnetic fields
| null | null |
10.1103/PhysRevC.82.025804
| null |
astro-ph.HE nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate medium effects due to density-dependent magnetic moments of
baryons on neutron stars under strong magnetic fields. If we allow the
variation of anomalous magnetic moments (AMMs) of baryons in dense matter under
strong magnetic fields, AMMs of nucleons are enhanced to be larger than those
of hyperons. The enhancement naturally affects the chemical potentials of
baryons to be large and leads to the increase of a proton fraction.
Consequently, it causes the suppression of hyperons, resulting in the stiffness
of the equation of state. Under the presumed strong magnetic fields, we
evaluate relevant particles' population, the equation of state and the maximum
masses of neutron stars by including density-dependent AMMs and compare them
with those obtained from AMMs in free space.
|
[{'version': 'v1', 'created': 'Mon, 23 Aug 2010 02:51:06 GMT'}]
|
2015-05-19
|
[array(['Ryu', 'C. Y.', ''], dtype=object)
array(['Kim', 'K. S.', ''], dtype=object)
array(['Cheoun', 'Myung-Ki', ''], dtype=object)]
|
4,650 |
2111.01819
|
Alfred Castro-Ginard
|
A. Castro-Ginard, C. Jordi, X. Luri, T. Cantat-Gaudin, J.M. Carrasco,
L. Casamiquela, F. Anders, L. Balaguer-N\'u\~nez and R.M. Badia
|
Hunting for open clusters in Gaia EDR3: $628$ new open clusters found
with OCfinder
|
13 pages, 12 figures. Accepted in Astronomy and Astrophysics
|
A&A 661, A118 (2022)
|
10.1051/0004-6361/202142568
| null |
astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The improvements in the precision of the published data in \textit{Gaia} EDR3
with respect to \textit{Gaia} DR2, particularly for parallaxes and proper
motions, offer the opportunity to increase the number of known open clusters in
the Milky Way by detecting farther and fainter objects that have so far go
unnoticed. Our aim is to keep completing the open cluster census in the Milky
Way with the detection of new stellar groups in the Galactic disc. We use
\textit{Gaia} EDR3 up to magnitude $G = 18$ mag, increasing in one unit the
magnitude limit and therefore the search volume explored in our previous
studies. We use the \texttt{OCfinder} method to search for new open clusters in
\textit{Gaia} EDR3 using a Big Data environment. As a first step,
\texttt{OCfinder} identifies stellar statistical overdensities in the five
dimensional astrometric space (position, parallax and proper motions) using the
\texttt{DBSCAN} clustering algorithm. Then, these overdensities are classified
into random statistical overdensities or real physical open clusters using a
deep artificial neural network trained on well-characterised $G$, $G_{\rm BP} -
G_{\rm RP}$ colour-magnitude diagrams. We report the discovery of $664$ new
open clusters within the Galactic disc, most of them located beyond $1$ kpc
from the Sun. From the estimation of ages, distances and line-of-sight
extinctions of these open clusters, we see that young clusters align following
the Galactic spiral arms while older ones are dispersed in the Galactic disc.
Furthermore, we find that most open clusters are located at low Galactic
altitudes with the exception of a few groups older than $1$ Gyr. We show the
success of the \texttt{OCfinder} method leading to the discovery of a total of
$1\,310$ open clusters (joining the discoveries here with the previous ones
based on \textit{Gaia} DR2)[abridged]
|
[{'version': 'v1', 'created': 'Tue, 2 Nov 2021 18:04:32 GMT'}
{'version': 'v2', 'created': 'Wed, 2 Mar 2022 10:14:43 GMT'}]
|
2022-05-25
|
[array(['Castro-Ginard', 'A.', ''], dtype=object)
array(['Jordi', 'C.', ''], dtype=object)
array(['Luri', 'X.', ''], dtype=object)
array(['Cantat-Gaudin', 'T.', ''], dtype=object)
array(['Carrasco', 'J. M.', ''], dtype=object)
array(['Casamiquela', 'L.', ''], dtype=object)
array(['Anders', 'F.', ''], dtype=object)
array(['Balaguer-Núñez', 'L.', ''], dtype=object)
array(['Badia', 'R. M.', ''], dtype=object)]
|
4,651 |
hep-ph/0605244
|
Olga Shekhovtsova
|
G. Pancheri, O. Shekhovtsova, G. Venanzoni
|
Test of FSR in the process $e^+e^-\to\pi^+\pi^-\gamma$ at DA$\Phi$NE and
extraction of the pion form factor at threshold
|
13 pages, 6 figures
|
Phys.Lett.B642:342-349,2006
|
10.1016/j.physletb.2006.09.053
| null |
hep-ph
| null |
Effects due to non-pointlike behaviour of pions in the process
$e^+e^-\to\pi^+\pi^-\gamma$ can arise for hard photons in the final state. By
means of a Monte Carlo event generator, which also includes the contribution of
the direct decay $\phi\to\pi^+\pi^-\gamma$, we estimate these effects in the
framework of Resonance Perturbation Theory. We consider angular cuts used in
the KLOE analysis of the pion form factor at threshold. A method to reveal the
effects of non-pointlike behaviour of pions in a model-independent way is
proposed.
|
[{'version': 'v1', 'created': 'Tue, 23 May 2006 11:35:29 GMT'}]
|
2008-11-26
|
[array(['Pancheri', 'G.', ''], dtype=object)
array(['Shekhovtsova', 'O.', ''], dtype=object)
array(['Venanzoni', 'G.', ''], dtype=object)]
|
4,652 |
2102.03367
|
Vivishek Sudhir
|
Vivishek Sudhir, Nadine Stritzelberger, Achim Kempf
|
Unruh Effect of Detectors with Quantized Center-of-Mass
| null |
Phys. Rev. D 103, 105023 (2021)
|
10.1103/PhysRevD.103.105023
| null |
quant-ph gr-qc
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
The Unruh effect is the prediction that particle detectors accelerated
through the vacuum get excited by the apparent presence of radiation quanta --
a fundamental quantum phenomenon in the presence of acceleration. Prior
treatments of the Unruh effect, that presume a classically prescribed
trajectory, do not account for the quantum dynamics of the detector's
center-of-mass. Here, we study more realistic detectors whose center of mass is
a quantized degree of freedom being accelerated by an external classical field.
We investigate the detector's recoil due to the emission of Unruh quanta. Vice
versa, we also study the recoil's impact on the emission of Unruh quanta and
the excitation of the detector. We find that the recoil due to the emission of
Unruh quanta may be a relevant experimental signature of the Unruh effect.
|
[{'version': 'v1', 'created': 'Fri, 5 Feb 2021 19:00:02 GMT'}]
|
2021-06-02
|
[array(['Sudhir', 'Vivishek', ''], dtype=object)
array(['Stritzelberger', 'Nadine', ''], dtype=object)
array(['Kempf', 'Achim', ''], dtype=object)]
|
4,653 |
1905.07400
|
Nandini Negi
|
Nandini Negi and Aranya Chakrabortty
|
Sparsity-Promoting Optimal Control of Cyber-Physical Systems over Shared
Communication Networks
|
Preliminary version appeared at American Control Conference (ACC)
2018
| null | null | null |
cs.SY math.OC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent years have seen several new directions in the design of sparse control
of cyber-physical systems (CPSs) driven by the objective of reducing
communication cost. One common assumption made in these designs is that the
communication happens over a dedicated network. For many practical
applications, however, communication must occur over shared networks, leading
to two critical design challenges, namely - time-delays in the feedback and
fair sharing of bandwidth among users. In this paper, we present a set of
sparse H2 control designs under these two design constraints. An important
aspect of our design is that the delay itself can be a function of sparsity,
which leads to an interesting pattern of trade-offs in the H2 performance. We
present three distinct algorithms. The first algorithm preconditions the
assignable bandwidth to the network and produces an initial guess for a
stabilizing controller. This is followed by our second algorithm, which
sparsifies this controller while simultaneously adapting the feedback delay and
optimizing the H2 performance using alternating directions method of
multipliers (ADMM). The third algorithm extends this approach to a multiple
user scenario where optimal number of communication links, whose total sum is
fixed, is distributed fairly among users by minimizing the variance of their H2
performances. The problem is cast as a difference-of-convex (DC) program with
mixed-integer linear program (MILP) constraints. We provide theorems to prove
convergence of these algorithms, followed by validation through numerical
simulations.
|
[{'version': 'v1', 'created': 'Fri, 17 May 2019 17:57:49 GMT'}]
|
2019-05-20
|
[array(['Negi', 'Nandini', ''], dtype=object)
array(['Chakrabortty', 'Aranya', ''], dtype=object)]
|
4,654 |
1909.04078
|
Riccardo La Grassa
|
Riccardo La Grassa, Ignazio Gallo, Alessandro Calefati, Dimitri
Ognibene
|
A Classification Methodology based on Subspace Graphs Learning
|
8 pages, Dicta Conference
| null | null | null |
cs.LG cs.AI stat.ML
|
http://creativecommons.org/licenses/by/4.0/
|
In this paper, we propose a design methodology for one-class classifiers
using an ensemble-of-classifiers approach. The objective is to select the best
structures created during the training phase using an ensemble of spanning
trees. It takes the best classifier, partitioning the area near a pattern into
$\gamma^{\gamma-2}$ sub-spaces and combining all possible spanning trees that
can be created starting from $\gamma$ nodes. The proposed method leverages on a
supervised classification methodology and the concept of minimum distance. We
evaluate our approach on well-known benchmark datasets and results obtained
demonstrate that it achieves comparable and, in many cases, state-of-the-art
results. Moreover, it obtains good performance even with unbalanced datasets.
|
[{'version': 'v1', 'created': 'Mon, 9 Sep 2019 18:10:06 GMT'}]
|
2019-09-11
|
[array(['La Grassa', 'Riccardo', ''], dtype=object)
array(['Gallo', 'Ignazio', ''], dtype=object)
array(['Calefati', 'Alessandro', ''], dtype=object)
array(['Ognibene', 'Dimitri', ''], dtype=object)]
|
4,655 |
2010.13374
|
Bruce W. Lee
|
Bruce W. Lee and Jason Lee
|
LXPER Index 2.0: Improving Text Readability Assessment Model for L2
English Students in Korea
|
NLP-TEA 2020, Association for Computational Linguistics
|
Proceedings of the 6th Workshop on Natural Language Processing
Techniques for Educational Applications, 2020
| null |
2020.nlptea-1.3
|
cs.CL cs.LG
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
Developing a text readability assessment model specifically for texts in a
foreign English Language Training (ELT) curriculum has never had much attention
in the field of Natural Language Processing. Hence, most developed models show
extremely low accuracy for L2 English texts, up to the point where not many
even serve as a fair comparison. In this paper, we investigate a text
readability assessment model for L2 English learners in Korea. In accordance,
we improve and expand the Text Corpus of the Korean ELT curriculum
(CoKEC-text). Each text is labeled with its target grade level. We train our
model with CoKEC-text and significantly improve the accuracy of readability
assessment for texts in the Korean ELT curriculum.
|
[{'version': 'v1', 'created': 'Mon, 26 Oct 2020 07:03:14 GMT'}
{'version': 'v2', 'created': 'Tue, 27 Oct 2020 17:04:03 GMT'}
{'version': 'v3', 'created': 'Thu, 5 Nov 2020 18:37:49 GMT'}
{'version': 'v4', 'created': 'Fri, 11 Dec 2020 11:04:49 GMT'}]
|
2020-12-14
|
[array(['Lee', 'Bruce W.', ''], dtype=object)
array(['Lee', 'Jason', ''], dtype=object)]
|
4,656 |
2111.08113
|
Franc Forstneric
|
Franc Forstneric
|
Every smoothly bounded p-convex domain in R^n admits a
p-plurisubharmonic defining function
|
Bull. Sci. Math., in press
|
Bull. Sci. Math., Vol. 175, 2022, 103100
|
10.1016/j.bulsci.2022.103100
| null |
math.CV math.DG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that every bounded domain $D$ in $\mathbb R^n$ with smooth $p$-convex
boundary for $2\le p < n$ admits a smooth defining function $\rho$ which is
$p$-plurisubharmonic on $\overline D$; if in addition $bD$ has no $p$-flat
points then $\rho$ can be chosen strongly $p$-plurisubharmonic on $D$. If $bD$
is $2$-convex then for any open connected conformal surface $M$ and conformal
harmonic map $f:M\to \overline D$, either $f(M)\subset D$ or $f(M)\subset bD$.
In particular, every conformal harmonic map $\mathbb D^*\to D$ from the
punctured disc extends to a conformal harmonic map $\mathbb D\to D$.
|
[{'version': 'v1', 'created': 'Mon, 15 Nov 2021 22:28:36 GMT'}
{'version': 'v2', 'created': 'Wed, 12 Jan 2022 15:44:25 GMT'}]
|
2022-03-25
|
[array(['Forstneric', 'Franc', ''], dtype=object)]
|
4,657 |
1909.06719
|
Harry Altman
|
Harry Altman and Andreas Weiermann
|
Maximum linearizations of lower sets in $\mathbb{N}^m$ with application
to monomial ideals
|
13 pages
| null | null | null |
math.LO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We compute the type (maximum linearization) of the well partial order of
bounded lower sets in $\mathbb{N}^m$, ordered under inclusion, and find it is
$\omega^{\omega^{m-1}}$; we give two proofs of this statement. Moreover we
compute the type of the set of all lower sets in $\mathbb{N}^m$, a topic
studied by Aschenbrenner and Pong, and find that it is equal to \[
\omega^{\sum_{k=1}^{m} \omega^{m-k}\binom{m}{k-1} }+ 1. \] As a consequence we
deduce corresponding bounds on sequences of monomial ideals.
|
[{'version': 'v1', 'created': 'Sun, 15 Sep 2019 02:50:15 GMT'}
{'version': 'v2', 'created': 'Sat, 28 Sep 2019 19:17:33 GMT'}
{'version': 'v3', 'created': 'Thu, 26 Dec 2019 06:17:22 GMT'}]
|
2019-12-30
|
[array(['Altman', 'Harry', ''], dtype=object)
array(['Weiermann', 'Andreas', ''], dtype=object)]
|
4,658 |
1302.7073
|
Yu Lan
|
Yu Lan, Jihong Qin, and Shiping Feng
|
Interplay between superconductivity and pseudogap state in bilayer
cuprate superconductors
|
7 pages, 2 figures
|
Phys. Lett. A 377, 2210 (2013)
| null | null |
cond-mat.supr-con
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The interplay between the superconducting gap and normal-state pseudogap in
the bilayer cuprate superconductors is studied based on the kinetic energy
driven superconducting mechanism. It is shown that the charge carrier
interaction directly from the interlayer coherent hopping in the kinetic energy
by exchanging spin excitations does not provide the contribution to the
normal-state pseudogap in the particle-hole channel and superconducting gap in
the particle-particle channel, while only the charge carrier interaction
directly from the intralayer hopping in the kinetic energy by exchanging spin
excitations induces the normal-state pseudogap in the particle-hole channel and
superconducting gap in the particle-particle channel, and then the two-gap
behavior is a universal feature for the single layer and bilayer cuprate
superconductors.
|
[{'version': 'v1', 'created': 'Thu, 28 Feb 2013 03:58:22 GMT'}
{'version': 'v2', 'created': 'Tue, 18 Jun 2013 13:28:17 GMT'}
{'version': 'v3', 'created': 'Thu, 25 Jul 2013 02:05:29 GMT'}]
|
2013-07-26
|
[array(['Lan', 'Yu', ''], dtype=object)
array(['Qin', 'Jihong', ''], dtype=object)
array(['Feng', 'Shiping', ''], dtype=object)]
|
4,659 |
1309.0115
|
N. Christopher Phillips
|
N. Christopher Phillips
|
Simplicity of UHF and Cuntz algebras on $L^p$~spaces
|
AMSLaTeX; 36 pages. Changes from version 1: Lemma 1.4: Proof replaced
by reference to literature. Theorem 3.7: Generalized to allow tensoring with
a fixed algebra (for use in another paper). Misprints corrected
| null | null | null |
math.FA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We prove that, for $p \in [1, \infty),$ and integers $d$ at least 2, the
$L^p$ analog ${\mathcal{O}}_d^p$ of the Cuntz algebra ${\mathcal{O}}_d$ is a
purely infinite simple amenable Banach algebra.
The proof requires what we call the spatial $L^p$ UHF algebras, which are
analogs of UHF algebras acting on $L^p$ spaces. As for the usual UHF
C*-algebras, they have associated supernatural numbers. For fixed $p \in [1,
\infty),$ we prove that any spatial $L^p$ UHF algebra is simple and amenable,
and that two such algebras are isomorphic if and only if they have the same
supernatural number (equivalently, the same scaled ordered $K_0$-group). For
distinct $p_1, p_2 \in [1, \infty),$ we prove that no spatial $L^{p_1}$ UHF
algebra is isomorphic to any spatial $L^{p_2}$ UHF algebra.
|
[{'version': 'v1', 'created': 'Sat, 31 Aug 2013 13:47:26 GMT'}
{'version': 'v2', 'created': 'Sat, 14 Sep 2013 17:05:05 GMT'}]
|
2013-09-17
|
[array(['Phillips', 'N. Christopher', ''], dtype=object)]
|
4,660 |
1910.12958
|
Thibault Sejourne
|
Thibault S\'ejourn\'e, Jean Feydy, Fran\c{c}ois-Xavier Vialard, Alain
Trouv\'e, Gabriel Peyr\'e
|
Sinkhorn Divergences for Unbalanced Optimal Transport
| null | null | null | null |
math.OC cs.LG stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Optimal transport induces the Earth Mover's (Wasserstein) distance between
probability distributions, a geometric divergence that is relevant to a wide
range of problems. Over the last decade, two relaxations of optimal transport
have been studied in depth: unbalanced transport, which is robust to the
presence of outliers and can be used when distributions don't have the same
total mass; entropy-regularized transport, which is robust to sampling noise
and lends itself to fast computations using the Sinkhorn algorithm. This paper
combines both lines of work to put robust optimal transport on solid ground.
Our main contribution is a generalization of the Sinkhorn algorithm to
unbalanced transport: our method alternates between the standard Sinkhorn
updates and the pointwise application of a contractive function. This implies
that entropic transport solvers on grid images, point clouds and sampled
distributions can all be modified easily to support unbalanced transport, with
a proof of linear convergence that holds in all settings. We then show how to
use this method to define pseudo-distances on the full space of positive
measures that satisfy key geometric axioms: (unbalanced) Sinkhorn divergences
are differentiable, positive, definite, convex, statistically robust and avoid
any "entropic bias" towards a shrinkage of the measures' supports.
|
[{'version': 'v1', 'created': 'Mon, 28 Oct 2019 20:40:37 GMT'}
{'version': 'v2', 'created': 'Fri, 19 Mar 2021 08:02:09 GMT'}
{'version': 'v3', 'created': 'Mon, 16 Jan 2023 16:36:08 GMT'}]
|
2023-01-18
|
[array(['Séjourné', 'Thibault', ''], dtype=object)
array(['Feydy', 'Jean', ''], dtype=object)
array(['Vialard', 'François-Xavier', ''], dtype=object)
array(['Trouvé', 'Alain', ''], dtype=object)
array(['Peyré', 'Gabriel', ''], dtype=object)]
|
4,661 |
1510.05394
|
Henri Gouin
|
Henri Gouin (M2P2), Tommaso Ruggeri (CIRAM)
|
Dynamical pressure for fluid mixtures with several temperatures
|
arXiv admin note: substantial text overlap with arXiv:0905.0226
|
M{\'e}canique and Industries / M{\'e}canique et Industries, EDP
Sciences, 2009, 10, pp.239-243. \<10.1051/meca/2009052\>
|
10.1051/meca/2009052
| null |
physics.class-ph math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider binary mixtures of fluids with components having different
temperatures. A new dynamical pressure term is associated with the difference
of temperatures between components even if fluid viscosities are null. The
non-equilibrium dynamical pressure can be measured and may be convenient in
several physical situations as for example in cosmological circumstances where
a dynamical pressure played a major role in the evolution of the early
universe.
|
[{'version': 'v1', 'created': 'Mon, 19 Oct 2015 08:53:31 GMT'}]
|
2015-10-20
|
[array(['Gouin', 'Henri', '', 'M2P2'], dtype=object)
array(['Ruggeri', 'Tommaso', '', 'CIRAM'], dtype=object)]
|
4,662 |
2005.12567
|
Konstantinos Anagnostopoulos N
|
Konstantinos N. Anagnostopoulos, Takehiro Azuma, Yuta Ito, Jun
Nishimura, Toshiyuki Okubo, Stratos Kovalkov Papadoudis
|
Dynamical Compactification of Extra Dimensions in the Euclidean IKKT
Matrix Model via Spontaneous Symmetry Breaking
|
15 pages, 2 figures, proceedings of the CORFU2019 Workshop on Quantum
Geometry, Field Theory and Gravity, September 18-25 2019
| null | null | null |
hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The IKKT matrix model has been conjectured to provide a promising
nonperturbative formulation of superstring theory. In this model, spacetime
emerges dynamically from the microscopic matrix degrees of freedom in the
large-N limit, and Monte Carlo simulations of the Lorentzian version provide
evidence of an emergent (3+1)-dimensional expanding space-time. In this talk,
we discuss the Euclidean version of the IKKT matrix model and provide evidence
of dynamical compactification of the extra dimensions via the spontaneous
symmetry breaking (SSB) of the 10D rotational symmetry. We perform numerical
simulations of a system with a severe complex action problem by using the
complex Langevin method (CLM). The CLM suffers from the singular-drift problem
and we deform the model in order to avoid it. We study the SSB pattern as we
vary the deformation parameter and we conclude that the original model has an
SO(3) symmetric vacuum, in agreement with previous calculations using the
Gaussian expansion method (GEM). We employ the GEM to the deformed model and we
obtain results consistent with the ones obtained by CLM.
|
[{'version': 'v1', 'created': 'Tue, 26 May 2020 08:24:05 GMT'}]
|
2020-05-27
|
[array(['Anagnostopoulos', 'Konstantinos N.', ''], dtype=object)
array(['Azuma', 'Takehiro', ''], dtype=object)
array(['Ito', 'Yuta', ''], dtype=object)
array(['Nishimura', 'Jun', ''], dtype=object)
array(['Okubo', 'Toshiyuki', ''], dtype=object)
array(['Papadoudis', 'Stratos Kovalkov', ''], dtype=object)]
|
4,663 |
2110.05938
|
Pascal Koiran
|
Pascal Koiran
|
Infall time in the Eddington-Finkelstein metric, with application to
Einstein-Rosen bridges
|
To appear in International Journal of Modern Physics D
| null |
10.1142/S0218271821501066
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Eddington-Finkelstein metric is obtained from the Schwarzschild metric by
a change of the time variable. It is well known that a test mass falling into a
black hole does not reach the event horizon for any finite value of the
Schwarzschild time variable $t$. By contrast, we show that the event horizon is
reached for a finite value of the Eddington-Finkelstein time variable $t'$.
Then we study in Eddington-Finkelstein time the fate of a massive particle
traversing an Einstein-Rosen bridge and obtain a different conclusion than
recent proposals in the literature: we show that the particle reaches the
wormhole throat for a finite value $t'_1$ of the time marker $t'$, and
continues its trajectory across the throat for $t'>t'_1$. Such a behavior does
not make sense in Schwarzschild time since it would amount to continuing the
trajectory of the particle "beyond the end of time."
|
[{'version': 'v1', 'created': 'Sat, 9 Oct 2021 15:35:11 GMT'}]
|
2021-10-13
|
[array(['Koiran', 'Pascal', ''], dtype=object)]
|
4,664 |
0710.3014
|
Sven Heinemeyer
|
S. Heinemeyer
|
Higgs-Boson Benchmarks in Agreement with CDM, EWPO and BPO
|
Submitted for the SUSY07 proceedings, 4 pages, 3 figures
| null | null | null |
hep-ph
| null |
We explore `benchmark planes' in the Minimal Supersymmetric Standard Model
(MSSM) that are in agreement with the measured cold dark matter (CDM) density,
electroweak precision observables (EWPO) and B physics observables (BPO). The
M_A-tan_beta planes are specified assuming that gaugino masses m_{1/2}, soft
trilinear supersymmetry-breaking parameters A_0 and the soft
supersymmetry-breaking contributions m_0 to the squark and slepton masses are
universal, but not those associated with the Higgs multiplets (the NUHM
framework). We discuss the prospects for probing experimentally these benchmark
surfaces at the Tevatron collider, the LHC and the ILC.
|
[{'version': 'v1', 'created': 'Tue, 16 Oct 2007 11:09:07 GMT'}]
|
2007-10-17
|
[array(['Heinemeyer', 'S.', ''], dtype=object)]
|
4,665 |
2001.09196
|
Ben Southworth
|
Ben S. Southworth and Milan Holec and Terry S. Haut
|
Diffusion synthetic acceleration for heterogeneous domains, compatible
with voids
|
23 pages, accepted to NSE
| null | null | null |
math.NA cs.NA physics.comp-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A standard approach to solving the S$_N$ transport equations is to use source
iteration with diffusion synthetic acceleration (DSA). Although this approach
is widely used and effective on many problems, there remain some practical
issues with DSA preconditioning, particularly on highly heterogeneous domains.
For large-scale parallel simulation, it is critical that both (i)
preconditioned source iteration converges rapidly, and (ii) the action of the
DSA preconditioner can be applied using fast, scalable solvers, such as
algebraic multigrid (AMG). For heterogeneous domains, these two interests can
be at odds. In particular, there exist DSA diffusion discretizations that can
be solved rapidly using AMG, but they do not always yield robust/fast
convergence of the larger source iteration. Conversely, there exist robust DSA
discretizations where source iteration converges rapidly on difficult
heterogeneous problems, but fast parallel solvers like AMG tend to struggle
applying the action of such operators. Moreover, very few current methods for
the solution of deterministic transport are compatible with voids. This paper
develops a new heterogeneous DSA preconditioner based on only preconditioning
the optically thick subdomains. The resulting method proves robust on a variety
of heterogeneous transport problems, including a linearized hohlraum mesh
related to inertial confinement fusion. Moreover, the action of the
preconditioner is easily computed using $\mathcal{O}(1)$ AMG iterations,
{convergence of the transport iteration typically requires $2-5\times$ less
iterations than current state-of-the-art ``full DSA,'' and the proposed method
is} trivially compatible with voids. On the hohlraum problem, rapid convergence
is obtained by preconditioning less than 3\% of the mesh elements with $5-10$
AMG iterations.
|
[{'version': 'v1', 'created': 'Fri, 24 Jan 2020 21:14:20 GMT'}
{'version': 'v2', 'created': 'Fri, 3 Apr 2020 22:56:42 GMT'}
{'version': 'v3', 'created': 'Fri, 29 May 2020 19:44:16 GMT'}
{'version': 'v4', 'created': 'Mon, 20 Jul 2020 21:51:03 GMT'}]
|
2020-07-22
|
[array(['Southworth', 'Ben S.', ''], dtype=object)
array(['Holec', 'Milan', ''], dtype=object)
array(['Haut', 'Terry S.', ''], dtype=object)]
|
4,666 |
hep-th/0302054
|
Shin'ichi Nojiri
|
Shin'ichi Nojiri, Sergei D. Odintsov
|
The one-loop vacuum energy and RG flow induced by double-trace operators
in AdS/CFT and dS/CFT correspondence
|
LaTeX file, 3 eps files, 26 pages. The discussion is clarified,
version to appear in PRD
|
Phys.Rev.D69:023511,2004
|
10.1103/PhysRevD.69.023511
|
AEI-2003-17
|
hep-th
| null |
We calculate the difference of one-loop vacuum energies for massive scalar
field in five-dimensional AdS black hole. (The same is done in five-dimensional
deSitter space). In each case this difference is specified by the boundary
conditions corresponding to the double-trace operator (massive term) and it
describes RG flow in the manner discussed by Gubser-Mitra for pure AdS space.
For AdS black hole there occurs instability which is the manifestation of the
Hawking-Page phase transition. For stable phase of AdS black hole as well as
for deSitter bulk, c-function found beyond the leading order approximation
shows the monotonic behaviour consistent with c-theorem.
|
[{'version': 'v1', 'created': 'Sat, 8 Feb 2003 10:35:26 GMT'}
{'version': 'v2', 'created': 'Fri, 31 Oct 2003 15:01:39 GMT'}]
|
2009-09-17
|
[array(['Nojiri', "Shin'ichi", ''], dtype=object)
array(['Odintsov', 'Sergei D.', ''], dtype=object)]
|
4,667 |
astro-ph/9412091
| null |
T. Kifune, et al, CANGAROO Collaboration
|
Very High Energy Gamma Rays from PSR1706-44
|
13 pages, latex format (article), 2 figures included
|
Astrophys.J.438:L91-L94,1995
|
10.1086/187723
|
To be published in Astrophysical Journal Letters
|
astro-ph
| null |
We have obtained evidence of gamma-ray emission above 1 TeV from PSR1706-44,
using a ground-based telescope of the atmospheric \v{C}erenkov imaging type
located near Woomera, South Australia. This object, a $\gamma$-ray source
discovered by the COS B satellite (2CG342-02), was identified with the radio
pulsar through the discovery of a 102 ms pulsed signal with the EGRET
instrument of the Compton Gamma Ray Observatory. The flux of the present
observation above a threshold of 1 TeV is $\bf \sim $ 1 $\cdot$ 10$^{-11}$
photons cm$^{-2}$ s$^{-1}$, which is two orders of magnitude smaller than the
extrapolation from GeV energies. The analysis is not restricted to a search for
emission modulated with the 102 ms period, and the reported flux is for all
$\gamma$-rays from PSR1706-44, pulsed and unpulsed. The energy output in the
TeV region corresponds to about 10$^{-3}$ of the spin down energy loss rate of
the neutron star.
|
[{'version': 'v1', 'created': 'Tue, 27 Dec 1994 02:19:55 GMT'}]
|
2011-04-04
|
[array(['Kifune', 'T.', ''], dtype=object)
array(['Collaboration', 'CANGAROO', ''], dtype=object)]
|
4,668 |
2212.14820
|
Anindita Bera
|
Anindita Bera, Joonwoo Bae, Beatrix C. Hiesmayr, and Dariusz
Chru\'sci\'nski
|
On the structure of mirrored operators obtained from optimal
entanglement witnesses
|
13 pages, 3 figures, 1 table, comments are welcome
| null | null | null |
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Entanglement witnesses (EWs) are a versatile tool in the verification of
entangled states. The framework of mirrored EW doubles the power of a given EW
by introducing its twin -- a mirrored EW -- whereby two EWs related by
mirroring can bound the set of separable states more efficiently. In this work,
we investigate the relation between the EWs and its mirrored ones, and present
a conjecture which claims that the mirrored operator obtained from an optimal
EW is either a positive operator or a decomposable EW, which implies that
positive-partial-transpose entangled states, also known as the bound entangled
states, cannot be detected. This conjecture is reached by studying numerous
known examples of optimal EWs. However, the mirrored EWs obtained from the
non-optimal ones can be non-decomposable as well. We also show that mirrored
operators obtained from the extremal decomposable witnesses are positive
semi-definite. Interestingly, the witnesses that violate the well known
conjecture of Structural Physical Approximation, do satisfy our conjecture. The
intricate relation between these two conjectures is discussed and it reveals a
novel structure of the separability problem.
|
[{'version': 'v1', 'created': 'Fri, 30 Dec 2022 16:49:33 GMT'}]
|
2023-01-02
|
[array(['Bera', 'Anindita', ''], dtype=object)
array(['Bae', 'Joonwoo', ''], dtype=object)
array(['Hiesmayr', 'Beatrix C.', ''], dtype=object)
array(['Chruściński', 'Dariusz', ''], dtype=object)]
|
4,669 |
2209.02376
|
Felipe Silveira
|
Francisco Caruso, Vitor Oguri, Felipe Silveira and Amos Troper
|
On the influence of Maxwell--Chern--Simons electrodynamics in nuclear
fusion involving electronic and muonic molecules
| null | null |
10.1209/0295-5075/aca2d4
| null |
nucl-th physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
New results recently obtained (\textit{Annals of Physics} (New York)
a.n.~168943) established some non-relativistic ground state solutions for
three-body molecules interacting through a Chern--Simons model. Within this
model, it was argued that Chern--Simons potential should not help improve the
fusion rates by replacing electrons with muons, in the case of particular
muonic molecules. This achievement motivated us to investigate quantitatively
whether or not the Maxwell--Chern--Simons electrodynamics could influence
positively, for example, the probability of having a muon-catalyzed fusion; its
contribution to electronic molecules is also considered in this letter. The
principal factors related to the probability of elementary nuclear fusion are
therefore numerically calculated and compared with their analogs admitting
other forms of interaction like $-1/\rho$ and $\ln (\rho)$. The analysis
carried on here confirms that one should not expect a significant improvement
in nuclear fusion rates in the case of muonic molecules, although,
surprisingly, the same is not true for electronic molecules, compared with
other theoretical predictions. Numerical predictions for the fusion rates for
$ppe$, $pp\mu$, $dde$ and $dd\mu$ molecules are given as well as the predicted
value for the tunneling rate for these molecules.
|
[{'version': 'v1', 'created': 'Sat, 27 Aug 2022 13:27:07 GMT'}]
|
2022-12-07
|
[array(['Caruso', 'Francisco', ''], dtype=object)
array(['Oguri', 'Vitor', ''], dtype=object)
array(['Silveira', 'Felipe', ''], dtype=object)
array(['Troper', 'Amos', ''], dtype=object)]
|
4,670 |
0711.4858
|
Gloria Koenigsberger
|
C. Foellmi, G. Koenigsberger, L. Georgiev, O. Toledano, S.V.
Marchenko, P. Massey, T.H. Dall, A.F.J. Moffat, N. Morrell, M. Corcoran, A.
Kaufer, Y. Naze, J. Pittard, N. St.-Louis, A. Fullerton, D. Massa, A.M.T.
Pollock
|
New insights into the nature of the SMC WR/LBV binary HD 5980
|
48 pages, 26 figures
|
Rev.Mex.Astron.Astrofis.44:3-27,2008
| null | null |
astro-ph
| null |
We present the results of optical wavelength observations of the unusual SMC
eclipsing binary system HD 5980 obtained in 1999 and 2004--2005. Radial
velocity curves for the erupting LBV/WR object (star A) and its close WR-like
companion (star B) are obtained by deblending the variable emission-line
profiles of N IV and N V lines under the simplistic assumption that these lines
originate primarily in the winds of star A and star B. The derived masses
M_A=58--79 Mo and M_B=51--67 Mo, are more consistent with the stars' location
near the top of the HRD than previous estimates. The presence of a wind-wind
interaction region is inferred from the orbital phase-dependent behavior of He
I P Cygni absorption components. The emission-line intensities continued with
the declining trend previously seen in UV spectra. The behavior of the
photospheric absorption lines is consistent with the results of Schweickhardt
(2002) who concludes that the third object in the combined spectrum, star C, is
also a binary system with P(starC)~96.5 days, e=0.83. The data used in this
paper will be made publicly available for further analysis.
|
[{'version': 'v1', 'created': 'Fri, 30 Nov 2007 02:32:32 GMT'}]
|
2014-11-18
|
[array(['Foellmi', 'C.', ''], dtype=object)
array(['Koenigsberger', 'G.', ''], dtype=object)
array(['Georgiev', 'L.', ''], dtype=object)
array(['Toledano', 'O.', ''], dtype=object)
array(['Marchenko', 'S. V.', ''], dtype=object)
array(['Massey', 'P.', ''], dtype=object)
array(['Dall', 'T. H.', ''], dtype=object)
array(['Moffat', 'A. F. J.', ''], dtype=object)
array(['Morrell', 'N.', ''], dtype=object)
array(['Corcoran', 'M.', ''], dtype=object)
array(['Kaufer', 'A.', ''], dtype=object)
array(['Naze', 'Y.', ''], dtype=object)
array(['Pittard', 'J.', ''], dtype=object)
array(['-Louis', 'N. St.', ''], dtype=object)
array(['Fullerton', 'A.', ''], dtype=object)
array(['Massa', 'D.', ''], dtype=object)
array(['Pollock', 'A. M. T.', ''], dtype=object)]
|
4,671 |
1705.07268
|
Koichi Takase
|
Koichi Takase
|
On generic supercuspidal representations of $Sp_{2n}$
|
17pages, no figures
| null | null | null |
math.NT math.RT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We will construct a family of irreducible generic supercuspidal
representations of the symplectic groups over non-archimedian local field $F$
of odd residual characteristic. The supercuspidal representations are compactly
induced from irreducible representations of the hyperspecial compact subgroup
which are inflated from irreducible representations of finite symplectic groups
over the finite quotient ring of the integer ring of $F$ modulo high powers of
the prime element.
|
[{'version': 'v1', 'created': 'Sat, 20 May 2017 07:00:30 GMT'}]
|
2017-05-23
|
[array(['Takase', 'Koichi', ''], dtype=object)]
|
4,672 |
astro-ph/0110146
|
Tae Furusho
|
T. Furusho (1), N. Y. Yamasaki (2), T. Ohashi (2), R. Shibata (3), and
H. Ezawa(4)((1)NASA/GSFC, (2)Tokyo Metro. Univ., (3)ISAS, (4)NAO/NRO)
|
Temperature Map of the Perseus Cluster of Galaxies Observed with ASCA
|
11 pages, 3 figures (including color), accepted for publication in
ApJ Letters
| null |
10.1086/324758
| null |
astro-ph
| null |
We present two-dimensional temperature map of the Perseus cluster based on
multi-pointing observations with the ASCA GIS, covering a region with a
diameter of ~2^\circ. By correcting for the effect of the X-ray telescope
response, the temperatures were estimated from hardness ratios and the complete
temperature structure of the cluster with a spatial resolution of about 100 kpc
was obtained for the first time. There is an extended cool region with a
diameter of ~20' and kT ~5 keV at about 20' east from the cluster center. This
region also shows higher surface brightness and is surrounded by a large
ring-like hot region with kT > 7 keV, and likely to be a remnant of a merger
with a poor cluster. Another extended cool region is extending outward from the
IC 310 subcluster. These features and the presence of several other hot and
cool blobs suggest that this rich cluster has been formed as a result of a
repetition of many subcluster mergers.
|
[{'version': 'v1', 'created': 'Fri, 5 Oct 2001 16:12:22 GMT'}]
|
2009-11-07
|
[array(['Furusho', 'T.', '', 'NASA/GSFC'], dtype=object)
array(['Yamasaki', 'N. Y.', '', 'Tokyo Metro. Univ'], dtype=object)
array(['Ohashi', 'T.', '', 'Tokyo Metro. Univ'], dtype=object)
array(['Shibata', 'R.', '', 'ISAS'], dtype=object)
array(['Ezawa', 'H.', '', 'NAO/NRO'], dtype=object)]
|
4,673 |
1610.03415
|
Martin Hairer
|
Martin Hairer, Jonathan Mattingly
|
The strong Feller property for singular stochastic PDEs
|
updated references and fixed typos
| null | null | null |
math.PR math-ph math.AP math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that the Markov semigroups generated by a large class of singular
stochastic PDEs satisfy the strong Feller property. These include for example
the KPZ equation and the dynamical $\Phi^4_3$ model. As a corollary, we prove
that the Brownian bridge measure is the unique invariant measure for the KPZ
equation with periodic boundary conditions.
|
[{'version': 'v1', 'created': 'Tue, 11 Oct 2016 16:25:27 GMT'}
{'version': 'v2', 'created': 'Tue, 25 Apr 2017 08:34:44 GMT'}]
|
2017-04-26
|
[array(['Hairer', 'Martin', ''], dtype=object)
array(['Mattingly', 'Jonathan', ''], dtype=object)]
|
4,674 |
1302.1459
|
Nikolaos Nomikos Mr.
|
Nikolaos Nomikos, Themistoklis Charalambous, Ioannis Krikidis,
Dimitrios Skoutas, Demosthenes Vouyioukas, and Mikael Johansson
|
A Buffer-aided Successive Opportunistic Relay Selection Scheme with
Power Adaptation and Inter-Relay Interference Cancellation for Cooperative
Diversity Systems
|
Preliminary results of this article have been presented in the IEEE
International Symposium on Personal Indoor and Mobile Radio Communications,
8-11 September, 2013, London, United Kingdom
| null |
10.1109/TCOMM.2015.2416234
| null |
cs.IT math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we consider a simple cooperative network consisting of a
source, a destination and a cluster of decode-and-forward half-duplex relays.
At each time-slot, the source and (possibly) one of the relays transmit a
packet to another relay and the destination, respectively, resulting in
inter-relay interference (IRI). In this work, with the aid of buffers at the
relays, we mitigate the detrimental effect of IRI through interference
cancellation. More specifically, we propose the min-power scheme that minimizes
the total energy expenditure per time slot under an IRI cancellation scheme.
Apart from minimizing the energy expenditure, the min-power selection scheme,
also provides better throughput and lower outage probability than existing
works in the literature. It is the first time that interference cancellation is
combined with buffer-aided relays and power adaptation to mitigate the IRI and
minimize the energy expenditure. The new relay selection policy is analyzed in
terms of outage probability and diversity, by modeling the evolution of the
relay buffers as a Markov Chain (MC). We construct the state transition matrix
of the MC, and hence obtain the steady state with which we can characterize the
outage probability. The proposed scheme outperforms relevant state-of-the-art
relay selection schemes in terms of throughput, diversity and energy
efficiency, as demonstrated via examples.
|
[{'version': 'v1', 'created': 'Wed, 6 Feb 2013 18:10:05 GMT'}
{'version': 'v2', 'created': 'Thu, 17 Jul 2014 14:13:44 GMT'}]
|
2016-11-18
|
[array(['Nomikos', 'Nikolaos', ''], dtype=object)
array(['Charalambous', 'Themistoklis', ''], dtype=object)
array(['Krikidis', 'Ioannis', ''], dtype=object)
array(['Skoutas', 'Dimitrios', ''], dtype=object)
array(['Vouyioukas', 'Demosthenes', ''], dtype=object)
array(['Johansson', 'Mikael', ''], dtype=object)]
|
4,675 |
cond-mat/0510583
|
Yogesh Singh
|
Yogesh Singh, R. S. Sannabhadti and S. Ramakrishnan
|
Low temperature properties of a new Kondo Lattice compound
Yb$_2$Ir$_3$Sn$_5$
|
3 pdf pages, 2 figures, 8references
|
To be presented at the national DAE Solid State Physics Symposium,
Mumbai, India (2005)
| null | null |
cond-mat.str-el
| null |
We report the preparation and results of our magnetic and transport
measurements on a new Yb-based ternary compound Yb$_2$Ir$_3$Sn$_5$. This
compound forms in the orthorhombic Cmc21 structure. DC magnetic susceptibility
between 1.8 K and 300 K reveal that Yb is in its magnetic trivalent state in
this compound. Electrical resistivity measurements down to 1. 5K show a
behavior typical of Kondo lattice compounds with a minimum in resistivity
around 8K and a coherence peak near 3K. AC magnetic susceptibility down to
100mK reveals an anti-ferromagnetic transition below 1.35 K.
|
[{'version': 'v1', 'created': 'Fri, 21 Oct 2005 15:08:24 GMT'}]
|
2007-05-23
|
[array(['Singh', 'Yogesh', ''], dtype=object)
array(['Sannabhadti', 'R. S.', ''], dtype=object)
array(['Ramakrishnan', 'S.', ''], dtype=object)]
|
4,676 |
1606.04038
|
Yongxin Yang
|
Yongxin Yang, Timothy M. Hospedales
|
Trace Norm Regularised Deep Multi-Task Learning
|
Submission to Workshop track - ICLR 2017
| null | null | null |
cs.LG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a framework for training multiple neural networks simultaneously.
The parameters from all models are regularised by the tensor trace norm, so
that each neural network is encouraged to reuse others' parameters if possible
-- this is the main motivation behind multi-task learning. In contrast to many
deep multi-task learning models, we do not predefine a parameter sharing
strategy by specifying which layers have tied parameters. Instead, our
framework considers sharing for all shareable layers, and the sharing strategy
is learned in a data-driven way.
|
[{'version': 'v1', 'created': 'Mon, 13 Jun 2016 17:15:43 GMT'}
{'version': 'v2', 'created': 'Fri, 17 Feb 2017 01:33:17 GMT'}]
|
2017-02-20
|
[array(['Yang', 'Yongxin', ''], dtype=object)
array(['Hospedales', 'Timothy M.', ''], dtype=object)]
|
4,677 |
2207.00963
|
Anders Karlsson
|
Anders Karlsson
|
A metric fixed point theorem and some of its applications
|
22 pages
| null | null | null |
math.FA math.MG
|
http://creativecommons.org/licenses/by/4.0/
|
A general fixed point theorem for isometries in terms of metric functionals
is proved under the assumption of the existence of a conical bicombing. It is
new even for isometries of Banach spaces as well as for non-locally compact
CAT(0)-spaces and injective spaces. Examples of actions on non-proper
CAT(0)-spaces come from the study of diffeomorphism groups, birational
transformations, and compact K\"ahler manifolds. A special case of the fixed
point theorem provides a novel mean ergodic theorem that in the Hilbert space
case implies von Neumann's theorem. The theorem accommodates classically
fixed-point-free isometric maps such as those of Kakutani, Edelstein, Alspach
and Prus. Moreover, from the main theorem together with some geometric
arguments of independent interest, one can deduce that every bounded invertible
operator of a Hilbert space admits a nontrivial invariant metric functional on
the space of positive operators. This is a result in the direction of the
invariant subspace problem although its full meaning is dependent on a future
determination of such metric functionals.
|
[{'version': 'v1', 'created': 'Sun, 3 Jul 2022 06:07:04 GMT'}
{'version': 'v2', 'created': 'Wed, 18 Jan 2023 12:15:13 GMT'}]
|
2023-01-19
|
[array(['Karlsson', 'Anders', ''], dtype=object)]
|
4,678 |
2012.09194
|
Yuan Su
|
Yuan Su, Hsin-Yuan Huang, Earl T. Campbell
|
Nearly tight Trotterization of interacting electrons
|
58 pages, 2 figures
|
Quantum 5, 495 (2021)
|
10.22331/q-2021-07-05-495
| null |
quant-ph cond-mat.str-el cs.DS
|
http://creativecommons.org/licenses/by/4.0/
|
We consider simulating quantum systems on digital quantum computers. We show
that the performance of quantum simulation can be improved by simultaneously
exploiting commutativity of the target Hamiltonian, sparsity of interactions,
and prior knowledge of the initial state. We achieve this using Trotterization
for a class of interacting electrons that encompasses various physical systems,
including the plane-wave-basis electronic structure and the Fermi-Hubbard
model. We estimate the simulation error by taking the transition amplitude of
nested commutators of the Hamiltonian terms within the $\eta$-electron
manifold. We develop multiple techniques for bounding the transition amplitude
and expectation of general fermionic operators, which may be of independent
interest. We show that it suffices to use
$\left(\frac{n^{5/3}}{\eta^{2/3}}+n^{4/3}\eta^{2/3}\right)n^{o(1)}$ gates to
simulate electronic structure in the plane-wave basis with $n$ spin orbitals
and $\eta$ electrons, improving the best previous result in second quantization
up to a negligible factor while outperforming the first-quantized simulation
when $n=\eta^{2-o(1)}$. We also obtain an improvement for simulating the
Fermi-Hubbard model. We construct concrete examples for which our bounds are
almost saturated, giving a nearly tight Trotterization of interacting
electrons.
|
[{'version': 'v1', 'created': 'Wed, 16 Dec 2020 19:00:05 GMT'}
{'version': 'v2', 'created': 'Wed, 30 Jun 2021 18:00:02 GMT'}]
|
2021-07-06
|
[array(['Su', 'Yuan', ''], dtype=object)
array(['Huang', 'Hsin-Yuan', ''], dtype=object)
array(['Campbell', 'Earl T.', ''], dtype=object)]
|
4,679 |
hep-ph/0512238
|
Andrzej Buras
|
Andrzej J. Buras
|
Photon Structure Functions: 1978 AND 2005
|
9 pages, 4 figures, to appear in Acta Physica Polonica, References
added
|
ActaPhys.Polon.B37:609-618,2006
| null |
TUM-HEP-616/05
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I describe the early days of the photon structure functions. In particular I
discuss the parton model result of Walsh and Zerwas (1973), leading order QCD
calculation of Witten (1976) and next-to-leading QCD calculation of Bardeen and
myself (1978). A very brief summary of the progress made from 1978 until 2005
is also given.
|
[{'version': 'v1', 'created': 'Mon, 19 Dec 2005 17:04:49 GMT'}
{'version': 'v2', 'created': 'Thu, 29 Nov 2012 15:07:06 GMT'}]
|
2012-11-30
|
[array(['Buras', 'Andrzej J.', ''], dtype=object)]
|
4,680 |
1806.08030
|
Weihai Zhang
|
Yao Liqiang and Zhang Weihai
|
Stability analysis of random nonlinear systems with time-varying delay
and its application
| null | null | null | null |
math.OC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper studies a class of random nonlinear systems with time-varying
delay, in which the $r$-order moment ($r\geq1$) of the random disturbance is
finite. Firstly, some general conditions are proposed to guarantee the
existence and uniqueness of the global solution to random nonlinear time-delay
systems. Secondly, some definitions and criteria on noise-to-state stability in
the moment sense and in probability sense are given by Lyapunov method
respectively. Finally, two regulation controllers are constructed respectively
for two corresponding random nonlinear time-delay systems and the effectiveness
of two proposed recursive procedures are demonstrated by two simulation
examples.
|
[{'version': 'v1', 'created': 'Thu, 21 Jun 2018 01:04:12 GMT'}]
|
2018-06-22
|
[array(['Liqiang', 'Yao', ''], dtype=object)
array(['Weihai', 'Zhang', ''], dtype=object)]
|
4,681 |
math/0212019
|
Marian Grendar
|
M. Grendar, Jr., M. Grendar
|
Randomness as an Equilibrium. Potential and Probability Density
|
4 pages, MaxEnt 2001 workshop
|
In: Bayesian inference and Maximum Entropy methods in Science and
Engineering, R. L. Fry (ed.), AIP (Melville), 405-410, 2002
| null | null |
math.PR math-ph math.MP
| null |
Randomness is viewed through an analogy between a physical quantity, density
of gas, and a mathematical construct -- probability density. Boltzmann's
deduction of equilibrium distribution of ideal gas placed in an external
potential field than provides a way of viewing probability density from a
perspective of forces/potentials, hidden behind it.
|
[{'version': 'v1', 'created': 'Mon, 2 Dec 2002 14:10:33 GMT'}]
|
2012-08-27
|
[array(['Grendar,', 'M.', 'Jr.'], dtype=object)
array(['Grendar', 'M.', ''], dtype=object)]
|
4,682 |
2210.16484
|
Jun Xia
|
Jun Xia, Yanqiao Zhu, Yuanqi Du, Stan Z.Li
|
A Systematic Survey of Chemical Pre-trained Models
|
IJCAI 2023, Survey Track
| null | null | null |
cs.LG cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Deep learning has achieved remarkable success in learning representations for
molecules, which is crucial for various biochemical applications, ranging from
property prediction to drug design. However, training Deep Neural Networks
(DNNs) from scratch often requires abundant labeled molecules, which are
expensive to acquire in the real world. To alleviate this issue, tremendous
efforts have been devoted to Molecular Pre-trained Models (CPMs), where DNNs
are pre-trained using large-scale unlabeled molecular databases and then
fine-tuned over specific downstream tasks. Despite the prosperity, there lacks
a systematic review of this fast-growing field. In this paper, we present the
first survey that summarizes the current progress of CPMs. We first highlight
the limitations of training molecular representation models from scratch to
motivate CPM studies. Next, we systematically review recent advances on this
topic from several key perspectives, including molecular descriptors, encoder
architectures, pre-training strategies, and applications. We also highlight the
challenges and promising avenues for future research, providing a useful
resource for both machine learning and scientific communities.
|
[{'version': 'v1', 'created': 'Sat, 29 Oct 2022 03:53:11 GMT'}
{'version': 'v2', 'created': 'Fri, 3 Feb 2023 08:30:51 GMT'}
{'version': 'v3', 'created': 'Thu, 27 Apr 2023 03:30:37 GMT'}]
|
2023-04-28
|
[array(['Xia', 'Jun', ''], dtype=object)
array(['Zhu', 'Yanqiao', ''], dtype=object)
array(['Du', 'Yuanqi', ''], dtype=object)
array(['Li', 'Stan Z.', ''], dtype=object)]
|
4,683 |
cond-mat/0604317
|
Peter Bokes
|
P. Bokes, J. Jung, and R. W. Godby
|
Quantum conductance of homogeneous and inhomogeneous interacting
electron systems
|
for resolution of the here published results see Phys. Rev. B 76,
125433 (2007)
| null | null | null |
cond-mat.mtrl-sci
| null |
We obtain the conductance of a system of electrons connected to leads, within
time-dependent density-functional theory, using a direct relation between the
conductance and the density response function. Corrections to the
non-interacting conductance appear as a consequence of the functional form of
the exchange-correlation kernel at small frequencies and wavevectors. The
simple adiabatic local-density approximation and non-local density-terms in the
kernel both give rise to significant corrections in general. In the homogeneous
electron gas, the former correction remains significant, and leads to a failure
of linear-response theory for densities below a critical value.
|
[{'version': 'v1', 'created': 'Wed, 12 Apr 2006 14:22:16 GMT'}]
|
2007-10-04
|
[array(['Bokes', 'P.', ''], dtype=object)
array(['Jung', 'J.', ''], dtype=object)
array(['Godby', 'R. W.', ''], dtype=object)]
|
4,684 |
astro-ph/0408525
|
Yuri Levin
|
Christopher D. Matzner (University of Toronto), Yuri Levin (CITA)
|
Protostellar Disks: Formation, Fragmentation, and the Brown Dwarf Desert
|
22 pages, 2 figures, accepted by ApJ. Improved discussions of the
criterion for local fragmentation and of the effects of stellar radiation;
expanded comparisons to numerical simulations and to observations
| null |
10.1086/430813
| null |
astro-ph
| null |
We argue that gravitational instability of typical protostellar disks is not
a viable mechanism for the fragmentation into multiple systems -- binary stars,
brown dwarf companions, or gas giant planets -- except at periods above roughly
20,000 years. Our conclusion is based on a comparison between prior numerical
work on disk self-gravity by Gammie (2001) with our own analytical models for
the dynamical and thermal state of protostellar disks. For this purpose we
first develop a simple theory for the initial conditions of low-mass star
formation, accounting for the effect of turbulence on the characteristic mass,
accretion rate, and angular momentum of collaping cores. Second, we examine the
criterion for fragmentation to occur during star formation, concentrating on
the self-gravitational instabilities of protostellar accretion disks in their
main accretion phase. Self-gravitational instabilities are strongly dependent
on the thermal state of the disk, and we find that the combination of viscous
heating and stellar irradiation quenches fragmentation due to Toomre's local
instability. Global instability of the disk may be required to process mass
supply, but is unlikely to produce fragments. Our findings help to explain the
dearth of substellar companions to stellar type stars: the brown dwarf desert.
|
[{'version': 'v1', 'created': 'Fri, 27 Aug 2004 18:04:23 GMT'}
{'version': 'v2', 'created': 'Sat, 9 Apr 2005 04:03:22 GMT'}]
|
2009-11-10
|
[array(['Matzner', 'Christopher D.', '', 'University of Toronto'],
dtype=object)
array(['Levin', 'Yuri', '', 'CITA'], dtype=object)]
|
4,685 |
1912.01058
|
David Blyth
|
D. Blyth, N. Mullins, E. Galyaev, J. Holmes
|
Nonnegative Gaussian process tomography for generalized segmented planar
detectors
| null | null |
10.1088/1748-0221/15/06/P06021
| null |
physics.ins-det eess.IV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The concept of Gaussian process tomography along with nonnegative constraints
is applied in the context of high-resolution image reconstruction using
segmented planar detectors with few readout channels.Expanding on the concept
of 2-D projections onto strip-like readout segmentations, 3-D projections as
well as more generalized detector segmentation and readout channel mappings are
explored. A focus is placed on reconstructing dose distributions in proton
therapy pencil beam scanning, and a fast, approximate approach to applying
nonnegative constraints is developed and motivated for use in proton therapy
beam imaging.
|
[{'version': 'v1', 'created': 'Mon, 2 Dec 2019 19:45:35 GMT'}
{'version': 'v2', 'created': 'Mon, 13 Apr 2020 06:12:27 GMT'}]
|
2020-08-26
|
[array(['Blyth', 'D.', ''], dtype=object)
array(['Mullins', 'N.', ''], dtype=object)
array(['Galyaev', 'E.', ''], dtype=object)
array(['Holmes', 'J.', ''], dtype=object)]
|
4,686 |
1211.4070
|
Petarpa Boonserm
|
Tritos Ngampitipan and Petarpa Boonserm
|
Bounding the Greybody Factors for Non-rotating Black Holes
|
21 pages, 11 figures
| null |
10.1142/S0218271813500582
| null |
math-ph gr-qc math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Semiclassical black holes emit radiation called Hawking radiation. Such
radiation, as seen by an asymptotic observer far outside the black hole,
differs from original radiation near the horizon of the black hole by a
redshift factor and the so-called "greybody factor". In this paper, we
concentrate on the greybody factor-various bounds for the greybody factors of
non-rotating black holes are obtained, concentrating on charged
Reissner-Nordstrom and Reissner-Nordstrom-de Sitter black holes. These bounds
can be derived by using a 2x2 transfer matrix formalism. It is found that the
charges of black holes act as efficient barriers. Furthermore, adding extra
dimensions to spacetime can shield Hawking radiation. Finally, the cosmological
constant can increase the emission rate of Hawking radiation.
|
[{'version': 'v1', 'created': 'Sat, 17 Nov 2012 03:29:45 GMT'}
{'version': 'v2', 'created': 'Thu, 22 Nov 2012 07:18:01 GMT'}]
|
2015-06-12
|
[array(['Ngampitipan', 'Tritos', ''], dtype=object)
array(['Boonserm', 'Petarpa', ''], dtype=object)]
|
4,687 |
2305.14594
|
Salem Lahlou
|
Salem Lahlou, Joseph D. Viviano, Victor Schmidt
|
torchgfn: A PyTorch GFlowNet library
| null | null | null | null |
cs.LG
|
http://creativecommons.org/licenses/by/4.0/
|
The increasing popularity of generative flow networks (GFlowNets or GFNs) is
accompanied with a proliferation of code sources. This hinders the
implementation of new features, such as training losses, that can readily be
compared to existing ones, on a set of common environments. In addition to
slowing down research in the field of GFlowNets, different code bases use
different conventions, that might be confusing for newcomers. `torchgfn` is a
library built on top of PyTorch, that aims at addressing both problems. It
provides user with a simple API for environments, and useful abstractions for
samplers and losses. Multiple examples are provided, replicating published
results. The code is available in https://github.com/saleml/torchgfn.
|
[{'version': 'v1', 'created': 'Wed, 24 May 2023 00:20:59 GMT'}]
|
2023-05-25
|
[array(['Lahlou', 'Salem', ''], dtype=object)
array(['Viviano', 'Joseph D.', ''], dtype=object)
array(['Schmidt', 'Victor', ''], dtype=object)]
|
4,688 |
1911.02370
|
Bulat Nurmievich Khabibullin
|
Liliia Gabdrakhmanova, Bulat Khabibullin
|
A Small Intervals Theorem for Subharmonic Functions
|
9 pages, in Russian
| null | null | null |
math.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Let $\mathbb C$ be the complex plane, $E$ be a measurable subset in a segment
$[0, R]$ of the positive semiaxis $\mathbb R^+$, $u\not\equiv -\infty$ be a
subharmonic function on $\mathbb C$. The main result of this article is an
upper estimate of the integral of the module $|u|$ over a subset of $E$ through
the maximum of the function $u$ on a circle of radius $R$ centered at zero and
a linear Lebesgue measure of subset $E$. Our result develops one of the
classical theorems of R. Nevanlinna in the case of $E=[0, R]$ and versions of
so-called Small Arcs Lemma by Edrei-Fuchs for small intervals on $\mathbb R^+$
from the works of A.F. Grishin, M.L. Sodin, T.I. Malyutina. Our obtained
estimate is uniform in the sense that the constants in the estimates are
absolute and do not depend on the subharmonic function under the
semi-normalization $u(0)\geq 0$.
|
[{'version': 'v1', 'created': 'Fri, 1 Nov 2019 13:46:28 GMT'}]
|
2019-11-07
|
[array(['Gabdrakhmanova', 'Liliia', ''], dtype=object)
array(['Khabibullin', 'Bulat', ''], dtype=object)]
|
4,689 |
cond-mat/0404012
|
Hui Hu
|
Hui Hu, A. Minguzzi, Xia-Ji Liu, and M. P. Tosi
|
Collective modes and ballistic expansion of a Fermi gas in the BCS-BEC
crossover
|
4 pages and 4 figures; proof version with more extensive discussions
on the comparison between theoretical results and experimental findings; to
appear in Phys. Rev. Lett. (Nov. 2004)
|
Phys. Rev. Lett. 93, 190403 (2004).
|
10.1103/PhysRevLett.93.190403
| null |
cond-mat.stat-mech
| null |
We evaluate the frequencies of collective modes and the anisotropic expansion
rate of a harmonically trapped Fermi superfluid at varying coupling strengths
across a Feshbach resonance driving a BCS-BEC crossover. The equations of
motion for the superfluid are obtained from a microscopic mean-field expression
for the compressibility and are solved within a scaling ansatz. Our results
confirm non-monotonic behavior in the crossover region and are in quantitative
agreement with current measurements of the transverse breathing mode by Kinast
{\it et al.} [Phys. Rev. Lett. {\bf 92}, 150402 (2004)] and of the axial
breathing mode by Bartenstein {\it et al.} [Phys. Rev. Lett. {\bf 92}, 203201
(2004)].
|
[{'version': 'v1', 'created': 'Thu, 1 Apr 2004 08:54:54 GMT'}
{'version': 'v2', 'created': 'Tue, 26 Oct 2004 02:05:39 GMT'}]
|
2007-05-23
|
[array(['Hu', 'Hui', ''], dtype=object)
array(['Minguzzi', 'A.', ''], dtype=object)
array(['Liu', 'Xia-Ji', ''], dtype=object)
array(['Tosi', 'M. P.', ''], dtype=object)]
|
4,690 |
1102.4922
|
Minghao Yin
|
Minghao Yin and Ping Huang
|
Counting Solutions of Constraint Satisfiability Problems:Exact Phase
Transitions and Approximate Algorithm
|
submitted to AAAI-11
| null | null | null |
cs.AI cs.CC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The study of phase transition phenomenon of NP complete problems plays an
important role in understanding the nature of hard problems. In this paper, we
follow this line of research by considering the problem of counting solutions
of Constraint Satisfaction Problems (#CSP). We consider the random model, i.e.
RB model. We prove that phase transition of #CSP does exist as the number of
variables approaches infinity and the critical values where phase transitions
occur are precisely located. Preliminary experimental results also show that
the critical point coincides with the theoretical derivation. Moreover, we
propose an approximate algorithm to estimate the expectation value of the
solutions number of a given CSP instance of RB model.
|
[{'version': 'v1', 'created': 'Thu, 24 Feb 2011 08:07:54 GMT'}]
|
2011-02-25
|
[array(['Yin', 'Minghao', ''], dtype=object)
array(['Huang', 'Ping', ''], dtype=object)]
|
4,691 |
1806.07265
|
Leonid Chekhov O
|
Jan Ambj{\o}rn and Leonid O. Chekhov
|
Spectral curves for hypergeometric Hurwitz numbers
|
13 pages, 3 figures. arXiv admin note: substantial text overlap with
arXiv:1409.3553
| null |
10.1016/j.geomphys.2018.07.004
| null |
math-ph hep-th math.AG math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider multi-matrix models that are generating functions for the numbers
of branched covers of the complex projective line ramified over $n$ fixed
points $z_i$, $i=1,\dots,n$, (generalized Grotendieck's dessins d'enfants) of
fixed genus, degree, and the ramification profiles at two points, $z_1$ and
$z_n$. Ramifications at other $n-2$ points enter the sum with the length of the
profile at $z_2$ and with the total length of profiles at the remaining $n-3$
points. We find the spectral curve of the model for $n=5$ using the loop
equation technique for the above generating function represented as a chain of
Hermitian matrices with a nearest-neighbor interaction of the type
tr$M_iM_{i+1}^{-1}$. The obtained spectral curve is algebraic and provides all
necessary ingredients for the topological recursion procedure producing
all-genus terms of the asymptotic expansion of our model in $1/N^2$. We discuss
braid-group symmetries of our model and perspectives of the proposed method.
|
[{'version': 'v1', 'created': 'Mon, 18 Jun 2018 12:25:47 GMT'}]
|
2018-08-15
|
[array(['Ambjørn', 'Jan', ''], dtype=object)
array(['Chekhov', 'Leonid O.', ''], dtype=object)]
|
4,692 |
2101.02347
|
Chao Gao
|
Chao Gao and Anderson Y. Zhang
|
SDP Achieves Exact Minimax Optimality in Phase Synchronization
| null | null | null | null |
math.ST math.OC stat.ML stat.TH
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the phase synchronization problem with noisy measurements
$Y=z^*z^{*H}+\sigma W\in\mathbb{C}^{n\times n}$, where $z^*$ is an
$n$-dimensional complex unit-modulus vector and $W$ is a complex-valued
Gaussian random matrix. It is assumed that each entry $Y_{jk}$ is observed with
probability $p$. We prove that an SDP relaxation of the MLE achieves the error
bound $(1+o(1))\frac{\sigma^2}{2np}$ under a normalized squared $\ell_2$ loss.
This result matches the minimax lower bound of the problem, and even the
leading constant is sharp. The analysis of the SDP is based on an equivalent
non-convex programming whose solution can be characterized as a fixed point of
the generalized power iteration lifted to a higher dimensional space. This
viewpoint unifies the proofs of the statistical optimality of three different
methods: MLE, SDP, and generalized power method. The technique is also applied
to the analysis of the SDP for $\mathbb{Z}_2$ synchronization, and we achieve
the minimax optimal error $\exp\left(-(1-o(1))\frac{np}{2\sigma^2}\right)$ with
a sharp constant in the exponent.
|
[{'version': 'v1', 'created': 'Thu, 7 Jan 2021 03:14:05 GMT'}
{'version': 'v2', 'created': 'Wed, 29 Dec 2021 18:59:19 GMT'}
{'version': 'v3', 'created': 'Tue, 8 Mar 2022 02:28:52 GMT'}
{'version': 'v4', 'created': 'Fri, 18 Mar 2022 03:45:12 GMT'}]
|
2022-03-21
|
[array(['Gao', 'Chao', ''], dtype=object)
array(['Zhang', 'Anderson Y.', ''], dtype=object)]
|
4,693 |
1102.4066
|
Luigi Del Debbio
|
Luigi Del Debbio
|
The conformal window on the lattice
|
Plenary talk at the Lattice 2010 conference. 26 pages, 12 figures.
Extended bibliography
| null | null | null |
hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Lattice simulations can play an important role in the study of dynamical
electroweak symmetry breaking by providing quantitative results on the
nonperturbative dynamics of candidate theories. For this programme to succeed,
it is crucial to identify the questions that are relevant for phenomenology,
and develop the tools that will provide robust answers to these questions. The
existence of a conformal window for nonsupersymmetric gauge theories, and its
characterization, is one of the phenomenologically important problems that can
be studied on the lattice. We summarize the recent results from studies of IR
fixed points by numerical simulations, discuss their current limitations, and
analyze the future perspectives.
|
[{'version': 'v1', 'created': 'Sun, 20 Feb 2011 12:45:30 GMT'}]
|
2011-02-22
|
[array(['Del Debbio', 'Luigi', ''], dtype=object)]
|
4,694 |
1603.09075
|
Yasutaka Hiraki Dr
|
Yasutaka Hiraki
|
Ionospheric current system accompanied by auroral vortex streets
|
8 pages, 4 figures
| null | null | null |
physics.space-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
High resolution optical measurements have revealed that a sudden brightening
of aurora and its deformation from an arc-like to a vortex street structure
appear just at the onset of substorm. The instability of Alfv$\acute{\rm e}$n
waves reflected from the ionosphere has been studied by means of
magnetohydrodynamic simulations in order to comprehend the formation of auroral
vortex streets. Our previous work reported that an initially placed arc
intensifies, splits, and deforms into a vortex street during a couple of
minutes, and the prime key is an enhancement of the convection electric field.
This study elaborated physics of the ionospheric horizontal currents related to
the vortex street in the context of so-called Cowling polarization. One
component is due to the perturbed electric field by Alfv$\acute{\rm e}$n waves,
and the other is due to the perturbed electron density (or polarization) in the
ionosphere. It was found that, when a vortex street develops, upward/downward
pair currents in its leading/trailing sides balance with an westward polarized
component of the Hall current; it generates an eastward perturbed component of
the Pedersen current. It was also found that both the perturbed component of
the Hall current and the polarized component of the Pedersen current point
equatorward, penetrating between the pair currents.
|
[{'version': 'v1', 'created': 'Wed, 30 Mar 2016 08:29:25 GMT'}]
|
2016-03-31
|
[array(['Hiraki', 'Yasutaka', ''], dtype=object)]
|
4,695 |
2211.05088
|
Philip Bull
|
Fraser Kennedy, Philip Bull, Michael Wilensky, Jacob Burba, Samir
Choudhuri
|
Statistical recovery of 21cm visibilities and their power spectra with
Gaussian constrained realisations and Gibbs sampling
|
Updated to match accepted version. Note minor changes to power
spectrum plots due to a small bugfix
| null | null | null |
astro-ph.CO astro-ph.IM
|
http://creativecommons.org/licenses/by-sa/4.0/
|
Radio interferometers designed to probe the 21cm signal from Cosmic Dawn and
the Epoch of Reionisation must contend with systematic effects that make it
difficult to achieve sufficient dynamic range to separate the 21cm signal from
foreground emission and other effects. For instance, the instrument's chromatic
response modulates the otherwise spectrally smooth foregrounds, making them
difficult to model, while a significant fraction of the data must be excised
due to the presence of radio frequency interference (RFI), leaving gaps in the
data. Errors in modelling the (modulated and gappy) foregrounds can easily
generate spurious contamination of what should otherwise be 21cm
signal-dominated modes. Various approaches have been developed to mitigate
these issues by (e.g.) using non-parametric reconstruction of the foregrounds,
in-painting the gaps, and weighting the data to reduce the level of
contamination. We present a Bayesian statistical method that combines these
approaches, using the coupled techniques of Gaussian constrained realisations
(GCR) and Gibbs sampling. This provides a way of drawing samples from the joint
posterior distribution of the 21cm signal modes and their power spectrum in the
presence of gappy data and an uncertain foreground model in a computationally
scalable manner. The data are weighted by an inverse covariance matrix that is
estimated as part of the inference, along with a foreground model that can then
be marginalised over. We demonstrate the application of this technique on a
simulated HERA-like delay spectrum analysis, comparing three different
approaches for accounting for the foreground components.
|
[{'version': 'v1', 'created': 'Wed, 9 Nov 2022 18:19:12 GMT'}
{'version': 'v2', 'created': 'Fri, 17 Mar 2023 11:29:55 GMT'}]
|
2023-03-20
|
[array(['Kennedy', 'Fraser', ''], dtype=object)
array(['Bull', 'Philip', ''], dtype=object)
array(['Wilensky', 'Michael', ''], dtype=object)
array(['Burba', 'Jacob', ''], dtype=object)
array(['Choudhuri', 'Samir', ''], dtype=object)]
|
4,696 |
1103.0062
|
Peter Sin
|
Andries E. Brouwer, Joshua E. Ducey and Peter Sin
|
The Elementary Divisors of the Incidence Matrix of Skew Lines in PG(3,q)
|
13 pages. The results of this paper supersede those in the paper
arXiv:math/1001.2551 V2. Minor corrections
| null | null | null |
math.CO math.GR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The elementary divisors of the incidence matrix of lines in PG(3,q) are
computed, where two lines are incident if and only if they are skew.
|
[{'version': 'v1', 'created': 'Tue, 1 Mar 2011 01:47:42 GMT'}
{'version': 'v2', 'created': 'Thu, 6 Oct 2011 17:47:06 GMT'}]
|
2011-10-07
|
[array(['Brouwer', 'Andries E.', ''], dtype=object)
array(['Ducey', 'Joshua E.', ''], dtype=object)
array(['Sin', 'Peter', ''], dtype=object)]
|
4,697 |
1305.4667
|
Ciprian Manolescu
|
Ciprian Manolescu
|
On the intersection forms of spin four-manifolds with boundary
|
fixed Lemma 3.8 and changed Definition 4.2
| null | null | null |
math.GT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We prove Furuta-type bounds for the intersection forms of spin cobordisms
between homology 3-spheres. The bounds are in terms of a new numerical
invariant of homology spheres, obtained from Pin(2)-equivariant Seiberg-Witten
Floer K-theory. In the process we introduce the notion of a Floer K_G-split
homology sphere; this concept may be useful in an approach to the 11/8
conjecture.
|
[{'version': 'v1', 'created': 'Mon, 20 May 2013 21:47:16 GMT'}
{'version': 'v2', 'created': 'Fri, 7 Jun 2013 16:54:03 GMT'}
{'version': 'v3', 'created': 'Mon, 23 Dec 2013 11:51:30 GMT'}
{'version': 'v4', 'created': 'Tue, 14 Jan 2014 03:19:40 GMT'}]
|
2014-01-15
|
[array(['Manolescu', 'Ciprian', ''], dtype=object)]
|
4,698 |
2107.04873
|
Salil Koner
|
Salil Koner, Jonathan P Williams
|
The EAS approach to variable selection for multivariate response data in
high-dimensional settings
| null | null | null | null |
stat.ME math.ST stat.TH
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we develop an {\em epsilon admissible subsets} (EAS) model
selection approach for performing group variable selection in the
high-dimensional multivariate regression setting. This EAS strategy is designed
to estimate a posterior-like, generalized fiducial distribution over a
parsimonious class of models in the setting of correlated predictors and/or in
the absence of a sparsity assumption. The effectiveness of our approach, to
this end, is demonstrated empirically in simulation studies, and is compared to
other state-of-the-art model/variable selection procedures. Furthermore,
assuming a matrix-Normal linear model we show that the EAS strategy achieves
{\em strong model selection consistency} in the high-dimensional setting if
there does exist a sparse, true data generating set of predictors. In contrast
to Bayesian approaches for model selection, our generalized fiducial approach
completely avoids the problem of simultaneously having to specify arbitrary
prior distributions for model parameters and penalize model complexity; our
approach allows for inference directly on the model complexity.
\textcolor{black}{Implementation of the method is illustrated through yeast
data to identify significant cell-cycle regulating transcription factors.
|
[{'version': 'v1', 'created': 'Sat, 10 Jul 2021 16:47:02 GMT'}
{'version': 'v2', 'created': 'Thu, 2 Dec 2021 06:05:55 GMT'}
{'version': 'v3', 'created': 'Mon, 12 Jun 2023 05:11:16 GMT'}]
|
2023-06-13
|
[array(['Koner', 'Salil', ''], dtype=object)
array(['Williams', 'Jonathan P', ''], dtype=object)]
|
4,699 |
2109.03597
|
Rakesh Arora
|
Rakesh Arora and Sergey Shmarev
|
Existence and regularity results for a class of parabolic problems with
double phase flux of variable growth
|
Comments are welcome
| null | null | null |
math.AP
|
http://creativecommons.org/publicdomain/zero/1.0/
|
We study the homogeneous Dirichlet problem for the equation \[
u_t-\operatorname{div}\left((a(z)\vert \nabla u\vert ^{p(z)-2}+b(z)\vert \nabla
u\vert ^{q(z)-2})\nabla u\right)=f\quad \text{in $Q_T=\Omega\times (0,T)$}, \]
where $\Omega\subset \mathbb{R}^N$, $N\geq 2$, is a bounded domain with
$\partial\Omega \in C^2$. The variable exponents $p$, $q$ and the nonnegative
modulating coefficients $a$, $b$ are given Lipschitz-continuous functions of
the argument $z=(x,t)\in Q_T$. It is assumed that $\frac{2N}{N+2}<p(z),\ q(z)$
and that the modulating coefficients and growth exponents satisfy the balance
conditions \[ \text{$a(z)+b(z)\geq \alpha>0$ in $\overline{Q}_T$},\;
\alpha=const;\qquad \text{$\vert p(z)-q(z)\vert <\frac{2}{N+2}$ in
$\overline{Q}_T$}. \] We find conditions on the source $f$ and the initial data
$u(\cdot,0)$ that guarantee the existence of a unique strong solution $u$ with
$u_t\in L^2(Q_T)$ and $a\vert \nabla u\vert ^{p}+b\vert \nabla u\vert ^q\in
L^\infty(0,T;L^1(\Omega))$. The solution possesses the property of global
higher integrability of the gradient, \[ \vert \nabla u\vert
^{\min\{p(z),q(z)\}+r}\in L^1(Q_T)\quad \text{with any $r\in
\left(0,\frac{4}{N+2}\right)$}, \] which is derived with the help of new
interpolation inequalities in the variable Sobolev spaces. The second-order
differentiability of the strong solution is proven: \[
D_{x_i}\left(\left(a\vert \nabla u\vert ^{p-2}+b\vert \nabla u\vert
^{q-2}\right)^{\frac{1}{2}}D_{x_j}u\right)\in L^2(Q_T),\quad i,j=1,2,\ldots,N.
\]
|
[{'version': 'v1', 'created': 'Wed, 8 Sep 2021 12:48:52 GMT'}]
|
2021-09-09
|
[array(['Arora', 'Rakesh', ''], dtype=object)
array(['Shmarev', 'Sergey', ''], dtype=object)]
|
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