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|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
17,500 |
1903.10531
|
Adam Lanman
|
Adam E. Lanman, Jonathan C. Pober
|
Fundamental uncertainty levels of 21cm power spectra from a delay
analysis
|
15 pages, 11 figures
| null |
10.1093/mnras/stz1639
| null |
astro-ph.IM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Several experimental efforts are underway to measure the power spectrum of
21cm fluctuations from the Epoch of Reionization (EoR) using low-frequency
radio interferometers. Experiments like the Hydrogen Epoch of Reionization
Array (HERA) and Murchison Widefield Array Phase II (MWA) feature
highly-redundant antenna layouts, building sensitivity through redundant
measurements of the same angular Fourier modes, at the expense of diminished UV
coverage. This strategy limits the numbers of independent samples of each power
spectrum mode, thereby increasing the effect of sample variance on the final
power spectrum uncertainty. To better quantify this effect, we measure the
sample variance of a delay-transform based power spectrum estimator, using both
analytic calculations and simulations of flat-spectrum EoR-like signals. We
find that for the shortest baselines in HERA, the sample variance can reach as
high as 20%, and up to 30% for the wider fields-of-view of the MWA. Combining
estimates from all the baselines in a HERA- or MWA-like 37 element redundant
hexagonal array can lower the variance to $1-3$% for some Fourier modes. These
results have important implications for observing and analysis strategies, and
suggest that sample variance can be non-negligible when constraining EoR model
parameters from upcoming 21cm data.
|
[{'version': 'v1', 'created': 'Mon, 25 Mar 2019 18:03:19 GMT'}]
|
2019-06-19
|
[array(['Lanman', 'Adam E.', ''], dtype=object)
array(['Pober', 'Jonathan C.', ''], dtype=object)]
|
17,501 |
cond-mat/0601539
|
Takeshi Mizushima
|
W. V. Pogosov, R. Kawate, T. Mizushima, K. Machida
|
Vortex structure in spinor F=2 Bose-Einstein condensates
|
6 pages, 3 figures
|
Phys. Rev. A 72, 063605 (2005)
|
10.1103/PhysRevA.72.063605
| null |
cond-mat.other
| null |
Extended Gross-Pitaevskii equations for the rotating F=2 condensate in a
harmonic trap are solved both numerically and variationally using trial
functions for each component of the wave function. Axially-symmetric vortex
solutions are analyzed and energies of polar and cyclic states are calculated.
The equilibrium transitions between different phases with changing of the
magnetization are studied. We show that at high magnetization the ground state
of the system is determined by interaction in "density" channel, and at low
magnetization spin interactions play a dominant role. Although there are five
hyperfine states, all the particles are always condensed in one, two or three
states. Two novel types of vortex structures are also discussed.
|
[{'version': 'v1', 'created': 'Tue, 24 Jan 2006 11:27:36 GMT'}]
|
2009-11-11
|
[array(['Pogosov', 'W. V.', ''], dtype=object)
array(['Kawate', 'R.', ''], dtype=object)
array(['Mizushima', 'T.', ''], dtype=object)
array(['Machida', 'K.', ''], dtype=object)]
|
17,502 |
1806.02600
|
Eric Marchand
|
Aziz L'Moudden and \'Eric Marchand
|
On Predictive Density Estimation under $\alpha$-divergence Loss
|
19 pages, 5 Figures
| null | null | null |
math.ST stat.TH
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Based on $X \sim N_d(\theta, \sigma^2_X I_d)$, we study the efficiency of
predictive densities under $\alpha-$divergence loss $L_{\alpha}$ for estimating
the density of $Y \sim N_d(\theta, \sigma^2_Y I_d)$. We identify a large number
of cases where improvement on a plug-in density are obtainable by expanding the
variance, thus extending earlier findings applicable to Kullback-Leibler loss.
The results and proofs are unified with respect to the dimension $d$, the
variances $\sigma^2_X$ and $\sigma^2_Y$, the choice of loss $L_{\alpha}$;
$\alpha \in (-1,1)$. The findings also apply to a large number of plug-in
densities, as well as for restricted parameter spaces with $\theta \in \Theta
\subset \mathbb{R}^d$. The theoretical findings are accompanied by various
observations, illustrations, and implications dealing for instance with
robustness with respect to the model variances and simultaneous dominance with
respect to the loss.
|
[{'version': 'v1', 'created': 'Thu, 7 Jun 2018 10:18:33 GMT'}]
|
2018-06-08
|
[array(["L'Moudden", 'Aziz', ''], dtype=object)
array(['Marchand', 'Éric', ''], dtype=object)]
|
17,503 |
2305.12337
|
Jihao Liu
|
Bingyi Chen, Jihao Liu, Lingyao Xie
|
Vanishing theorems for generalized pairs
|
12 pages
| null | null | null |
math.AG
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
We establish the Kodaira vanishing theorem and the Kawamata-Viehweg vanishing
theorem for lc generalized pairs. As a consequence, we provide a new proof of
the base-point-freeness theorem for lc generalized pairs. This new approach
allows us to prove the contraction theorem for lc generalized pairs without
using Koll\'ar's gluing theory.
|
[{'version': 'v1', 'created': 'Sun, 21 May 2023 04:15:28 GMT'}]
|
2023-05-23
|
[array(['Chen', 'Bingyi', ''], dtype=object)
array(['Liu', 'Jihao', ''], dtype=object)
array(['Xie', 'Lingyao', ''], dtype=object)]
|
17,504 |
2306.17605
|
Pierre-Louis Giscard
|
Lo\"ic Foissy and Pierre-Louis Giscard and C\'ecile Mammez
|
A co-preLie structure from chronological loop erasure in graph walks
| null | null | null | null |
math.CO math.RA
|
http://creativecommons.org/publicdomain/zero/1.0/
|
We show that the chronological removal of cycles from a walk on a graph,
known as Lawler's loop-erasing procedure, generates a preLie co-algebra on the
vector space spanned by the walks. In addition, we prove that the tensor and
symmetric algebras of graph walks are graded Hopf algebras, provide their
antipodes explicitly and recover the preLie co-algebra from a brace coalgebra
on the tensor algebra of graph walks. Finally we exhibit sub-Hopf algebras
associated to particular types of walks.
|
[{'version': 'v1', 'created': 'Fri, 30 Jun 2023 12:26:23 GMT'}]
|
2023-07-03
|
[array(['Foissy', 'Loïc', ''], dtype=object)
array(['Giscard', 'Pierre-Louis', ''], dtype=object)
array(['Mammez', 'Cécile', ''], dtype=object)]
|
17,505 |
0910.1805
|
Agliolo Gallitto Aurelio
|
A. Agliolo Gallitto, G. Bonsignore, M. Bonura, M. Li Vigni, J. L. Luo
and A. F. Shevchun
|
Electromagnetic response of LaO_0.94F_0.06FeAs: AC susceptibility and
microwave surface resistance
|
8 pages, 4 embedded eps figures; Proceedings of the 9th EUCAS
Conference (Dresden, Germany, September 13-17, 2009)
|
J. Phys.: Conf. Series 234 (2010) 012001-6
|
10.1088/1742-6596/234/1/012001
| null |
cond-mat.supr-con
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss on the electromagnetic response of a polycrystalline sample of
LaO_0.94F_0.06FeAs exposed to DC magnetic fields up to 10 kOe. The low- and
high-frequency responses have been investigated by measuring the AC
susceptibility at 100 kHz and the microwave surface resistance at 9.6 GHz. At
low as well as high DC magnetic fields, the susceptibility strongly depends on
the amplitude of the AC driving field, highlighting enhanced nonlinear effects.
The field dependence of the AC susceptibility exhibits a magnetic hysteresis
that can be justified considering the intragrain-field-penetration effects on
the intergrain critical current density. The microwave surface resistance
exhibits a clockwise magnetic hysteresis, which cannot be justified in the
framework of the critical-state models of the Abrikosov-fluxon lattice; it may
have the same origin as that detected in the susceptibility.
|
[{'version': 'v1', 'created': 'Fri, 9 Oct 2009 18:05:35 GMT'}]
|
2011-01-20
|
[array(['Gallitto', 'A. Agliolo', ''], dtype=object)
array(['Bonsignore', 'G.', ''], dtype=object)
array(['Bonura', 'M.', ''], dtype=object)
array(['Vigni', 'M. Li', ''], dtype=object)
array(['Luo', 'J. L.', ''], dtype=object)
array(['Shevchun', 'A. F.', ''], dtype=object)]
|
17,506 |
1404.4835
|
Deepak Gumber
|
Deepak Gumber and Hemant Kalra
|
The conjugacy class number k(G) - a different perspective
|
2 pages
| null | null | null |
math.GR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Let $G$ be a finite group. Let $k(G)$ denote the number of conjugacy classes
of $G$ and let $m(G)$ denote the least positive integer $n$ such that the union
of any $n$ distinct non-trivial conjugacy classes of $G$ together with the
identity of $G$ is a subgroup of $G$. We prove that $m(G)=k(G)-1$ for all
$m(G)\ge 2$.
|
[{'version': 'v1', 'created': 'Fri, 18 Apr 2014 16:30:50 GMT'}]
|
2014-04-21
|
[array(['Gumber', 'Deepak', ''], dtype=object)
array(['Kalra', 'Hemant', ''], dtype=object)]
|
17,507 |
1910.00978
|
Alexei Kovalev
|
Alexei Kovalev
|
Deformations of calibrated submanifolds with boundary
|
To appear in a forthcoming volume of the Fields Institute
Communications, entitled "Lectures and Surveys on G2 manifolds and related
topics"
| null | null | null |
math.DG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review some results concerning the deformations of calibrated minimal
submanifolds which occur in Riemannian manifolds with special holonomy. The
calibrated submanifolds are assumed compact with a non-empty boundary which is
constrained to move in a particular fixed submanifold. The results extend
McLean's deformation theory previously developed for closed compact
submanifolds.
|
[{'version': 'v1', 'created': 'Wed, 2 Oct 2019 14:33:21 GMT'}]
|
2019-10-03
|
[array(['Kovalev', 'Alexei', ''], dtype=object)]
|
17,508 |
1911.03864
|
Ofir Press
|
Ofir Press, Noah A. Smith, Omer Levy
|
Improving Transformer Models by Reordering their Sublayers
|
To appear at ACL 2020
| null | null | null |
cs.CL cs.LG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Multilayer transformer networks consist of interleaved self-attention and
feedforward sublayers. Could ordering the sublayers in a different pattern lead
to better performance? We generate randomly ordered transformers and train them
with the language modeling objective. We observe that some of these models are
able to achieve better performance than the interleaved baseline, and that
those successful variants tend to have more self-attention at the bottom and
more feedforward sublayers at the top. We propose a new transformer pattern
that adheres to this property, the sandwich transformer, and show that it
improves perplexity on multiple word-level and character-level language
modeling benchmarks, at no cost in parameters, memory, or training time.
However, the sandwich reordering pattern does not guarantee performance gains
across every task, as we demonstrate on machine translation models. Instead, we
suggest that further exploration of task-specific sublayer reorderings is
needed in order to unlock additional gains.
|
[{'version': 'v1', 'created': 'Sun, 10 Nov 2019 06:14:15 GMT'}
{'version': 'v2', 'created': 'Thu, 23 Apr 2020 10:16:33 GMT'}]
|
2020-04-24
|
[array(['Press', 'Ofir', ''], dtype=object)
array(['Smith', 'Noah A.', ''], dtype=object)
array(['Levy', 'Omer', ''], dtype=object)]
|
17,509 |
2212.06724
|
Matt Holzer
|
Matt Holzer, Matthew Kearney, Samuel Molseed, Katie Tuttle and David
Wigginton
|
Pushed fronts in a Fisher-KPP-Burgers system using geometric
desingularization
| null | null | null | null |
math.AP math.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study traveling fronts in a system of one dimensional
reaction-diffusion-advection equations motivated by problems in reactive flows.
In the limit as a parameter tends to infinity, we construct the approximate
front profile and determine the leading order expansion for the selected
wavespeed. Such fronts are often constructed as transverse intersections of
stable and unstable manifolds of the traveling wave differential equation.
However, a re-scaling of the dependent variable leads to a lack of
hyperbolicity for one of the end states making the definition of one such
manifold unclear. We use geometric blow-up techniques to recover hyperbolicity
and following an analysis of the blown up vector field are able to show the
existence of a traveling front with a leading order expansion of its speed.
|
[{'version': 'v1', 'created': 'Tue, 13 Dec 2022 16:53:03 GMT'}]
|
2022-12-14
|
[array(['Holzer', 'Matt', ''], dtype=object)
array(['Kearney', 'Matthew', ''], dtype=object)
array(['Molseed', 'Samuel', ''], dtype=object)
array(['Tuttle', 'Katie', ''], dtype=object)
array(['Wigginton', 'David', ''], dtype=object)]
|
17,510 |
1106.0050
|
Burkhard Militzer
|
B. Militzer
|
Bonding and Electronic Properties of Ice at High Pressure
|
9 pages, 6 figures
| null | null | null |
cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The properties of water ice at megabar pressure are characterized with ab
initio computer simulations. The focus lies on the metallic Cmcm phase and its
insulating distorted analogue with Pnma symmetry. Both phases were recently
predicted to occur at 15.5 and 12.5 Mbar respectively [Phys. Rev. Lett. 105
(2010) 195701]. The Fermi surface of the Cmcm phase is analyzed and possibility
of Fermi nesting to occur is discussed. The Wannier orbital are computed for
the Pnma structure and compared to ice X. While ice X shows typical sp3
hybridization, in the Pnma structure, the orbitals are deformed and no longer
all aligned with the hydrogen bonds.
|
[{'version': 'v1', 'created': 'Tue, 31 May 2011 22:46:18 GMT'}]
|
2011-06-02
|
[array(['Militzer', 'B.', ''], dtype=object)]
|
17,511 |
1606.02849
|
Rhishi Singh
|
Garimella Rama Murthy, Rhishi Pratap Singh, Samdarshi Abhijeet, Sachin
Chaudhary
|
Time Optimal Spectrum Sensing
| null | null | null | null |
cs.IT math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Spectrum sensing is a fundamental operation in cognitive radio environment.
It gives information about spectrum availability by scanning the bands. Usually
a fixed amount of time is given to scan individual bands. Most of the times,
historical information about the traffic in the spectrum bands is not used. But
this information gives the idea, how busy a specific band is. Therefore,
instead of scanning a band for a fixed amount of time, more time can be given
to less occupied bands and less time to heavily occupied ones. In this paper we
have formulated the time assignment problem as integer linear programming and
source coding problems. The time assignment problem is solved using the
associated stochastic optimization problem.
|
[{'version': 'v1', 'created': 'Thu, 9 Jun 2016 07:51:06 GMT'}]
|
2016-06-10
|
[array(['Murthy', 'Garimella Rama', ''], dtype=object)
array(['Singh', 'Rhishi Pratap', ''], dtype=object)
array(['Abhijeet', 'Samdarshi', ''], dtype=object)
array(['Chaudhary', 'Sachin', ''], dtype=object)]
|
17,512 |
1501.03200
|
Grzegorz Serafin
|
Andrzej Py\'c, Grzegorz Serafin, Tomasz \.Zak
|
Supremum distribution of Bessel process of drifting Brownian motion
| null | null | null | null |
math.PR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Let (B^{(1)}_t ;B^{(2)}_t ;B^{(3)}_t + \mu t) be a three-dimensional Brownian
motion with drift \mu, starting at the origin. Then X_t = ||(B^{(1)}_t
;B^{(2)}_t ;B^{(3)}_t +\mu t)||, its distance from the starting point, is a
diffusion with many applications. We investigate the distribution of the
supremum of (X_t), give an infinite-series formula for its density and an exact
estimate by elementary functions.
|
[{'version': 'v1', 'created': 'Tue, 13 Jan 2015 22:55:46 GMT'}]
|
2015-01-15
|
[array(['Pyć', 'Andrzej', ''], dtype=object)
array(['Serafin', 'Grzegorz', ''], dtype=object)
array(['Żak', 'Tomasz', ''], dtype=object)]
|
17,513 |
2108.05826
|
Nils Leif Fischer
|
Nils L. Fischer, Harald P. Pfeiffer
|
Unified discontinuous Galerkin scheme for a large class of elliptic
equations
|
22 pages, 13 figures, 2 tables, published version. Results are
reproducible with the ancillary input files
|
Phys. Rev. D 105, 024034 (2022)
|
10.1103/PhysRevD.105.024034
| null |
math.NA cs.NA gr-qc physics.comp-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a discontinuous Galerkin internal-penalty scheme that is
applicable to a large class of linear and nonlinear elliptic partial
differential equations. The unified scheme can accommodate all second-order
elliptic equations that can be formulated in first-order flux form,
encompassing problems in linear elasticity, general relativity, and
hydrodynamics, including problems formulated on a curved manifold. It allows
for a wide range of linear and nonlinear boundary conditions, and accommodates
curved and nonconforming meshes. Our generalized internal-penalty numerical
flux and our Schur-complement strategy of eliminating auxiliary degrees of
freedom make the scheme compact without requiring equation-specific
modifications. We demonstrate the accuracy of the scheme for a suite of
numerical test problems. The scheme is implemented in the open-source SpECTRE
numerical relativity code.
|
[{'version': 'v1', 'created': 'Thu, 12 Aug 2021 16:12:12 GMT'}
{'version': 'v2', 'created': 'Tue, 11 Jan 2022 21:36:50 GMT'}]
|
2022-01-13
|
[array(['Fischer', 'Nils L.', ''], dtype=object)
array(['Pfeiffer', 'Harald P.', ''], dtype=object)]
|
17,514 |
1612.06623
|
Gal Dalal
|
Raphael Canyasse, Gal Dalal, Shie Mannor
|
Supervised Learning for Optimal Power Flow as a Real-Time Proxy
| null | null | null | null |
cs.LG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work we design and compare different supervised learning algorithms
to compute the cost of Alternating Current Optimal Power Flow (ACOPF). The
motivation for quick calculation of OPF cost outcomes stems from the growing
need of algorithmic-based long-term and medium-term planning methodologies in
power networks. Integrated in a multiple time-horizon coordination framework,
we refer to this approximation module as a proxy for predicting short-term
decision outcomes without the need of actual simulation and optimization of
them. Our method enables fast approximate calculation of OPF cost with less
than 1% error on average, achieved in run-times that are several orders of
magnitude lower than of exact computation. Several test-cases such as
IEEE-RTS96 are used to demonstrate the efficiency of our approach.
|
[{'version': 'v1', 'created': 'Tue, 20 Dec 2016 12:15:17 GMT'}]
|
2016-12-21
|
[array(['Canyasse', 'Raphael', ''], dtype=object)
array(['Dalal', 'Gal', ''], dtype=object)
array(['Mannor', 'Shie', ''], dtype=object)]
|
17,515 |
1007.1915
|
Henrik Sepp\"anen
|
Henrik Sepp\"anen
|
Okounkov bodies for ample line bundles
| null | null | null | null |
math.CV math.AG math.RT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Let $\mathscr{L} \rightarrow X$ be an ample line bundle over a nonsingular
complex projective variety $X$. We construct an admissable flag $X_0 \subseteq
X_1 \subseteq...\subseteq X_n=X$ of subvarieties for which the associated
Okounkov body for $\mathscr{L}$ is a rational polytope.
|
[{'version': 'v1', 'created': 'Mon, 12 Jul 2010 14:42:59 GMT'}
{'version': 'v2', 'created': 'Wed, 14 Jul 2010 13:02:34 GMT'}
{'version': 'v3', 'created': 'Wed, 6 Jun 2012 12:48:21 GMT'}]
|
2012-06-07
|
[array(['Seppänen', 'Henrik', ''], dtype=object)]
|
17,516 |
2207.14362
|
Makoto Katori
|
Makoto Katori
|
Point Processes and Multiple SLE/GFF Coupling
|
v3: LaTeX, 92 pages, 9 figures; lectures for the 4th ZiF Summer
School `Randomness in Physics and Mathematics: From Integrable Probability to
Disordered Systems' held at ZiF--Center for Interdisciplinary Research,
Bielefeld University, Germany, 1-13 August 2022
| null | null | null |
math.PR cond-mat.stat-mech math-ph math.MP
|
http://creativecommons.org/licenses/by/4.0/
|
In the series of lectures, we will discuss probability laws of random points,
curves, and surfaces. Starting from a brief review of the notion of
martingales, one-dimensional Brownian motion (BM), and the $D$-dimensional
Bessel processes, BES$_{D}$, $D \geq 1$, first we study Dyson's Brownian motion
model with parameter $\beta >0$, DYS$_{\beta}$, which is regarded as
multivariate extensions of BES$_D$ with the relation $\beta=D-1$. Next, using
the reproducing kernels of Hilbert function spaces, the Gaussian analytic
functions (GAFs) are defined on a unit disk and an annulus. As zeros of the
GAFs, determinantal point processes and permanental-determinantal point
processes are obtained. Then, the Schramm--Loewner evolution with parameter
$\kappa >0$, SLE$_{\kappa}$, is introduced, which is driven by a BM on
${\mathbb{R}}$ and generates a family of conformally invariant probability laws
of random curves on the upper half complex plane ${\mathbb{H}}$. We regard
SLE$_{\kappa}$ as a complexification of BES$_D$ with the relation
$\kappa=4/(D-1)$. The last topic of lectures is the construction of the
multiple SLE$_{\kappa}$, which is driven by the $N$-particle process on
${\mathbb{R}}$ and generates $N$ interacting random curves in ${\mathbb{H}}$.
We prove that the multiple SLE/GFF coupling is established, if and only if the
driving $N$-particle process on ${\mathbb{R}}$ is identified with DYS$_{\beta}$
with the relation $\beta=8/\kappa$.
|
[{'version': 'v1', 'created': 'Thu, 28 Jul 2022 19:49:33 GMT'}
{'version': 'v2', 'created': 'Fri, 5 Aug 2022 09:16:54 GMT'}
{'version': 'v3', 'created': 'Fri, 12 Aug 2022 20:26:14 GMT'}]
|
2022-08-16
|
[array(['Katori', 'Makoto', ''], dtype=object)]
|
17,517 |
0806.3293
|
Samuel E. Gralla
|
Samuel E. Gralla and Robert M. Wald
|
A Rigorous Derivation of Gravitational Self-force
|
typos fixed; errors in equations corrected; notes added to text
|
Class.Quant.Grav.25:205009,2008; Erratum-ibid.28:159501,2011
|
10.1088/0264-9381/25/20/205009 10.1088/0264-9381/28/15/159501
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
There is general agreement that the MiSaTaQuWa equations should describe the
motion of a "small body" in general relativity, taking into account the leading
order self-force effects. However, previous derivations of these equations have
made a number of ad hoc assumptions and/or contain a number of unsatisfactory
features. For example, all previous derivations have invoked, without proper
justification, the step of "Lorenz gauge relaxation", wherein the linearized
Einstein equation is written down in the form appropriate to the Lorenz gauge,
but the Lorenz gauge condition is then not imposed--thereby making the
resulting equations for the metric perturbation inequivalent to the linearized
Einstein equations. In this paper, we analyze the issue of "particle motion" in
general relativity in a systematic and rigorous way by considering a
one-parameter family of metrics, $g_{ab} (\lambda)$, corresponding to having a
body (or black hole) that is "scaled down" to zero size and mass in an
appropriate manner. We prove that the limiting worldline of such a
one-parameter family must be a geodesic of the background metric, $g_{ab}
(\lambda=0)$. Gravitational self-force--as well as the force due to coupling of
the spin of the body to curvature--then arises as a first-order perturbative
correction in $\lambda$ to this worldline. No assumptions are made in our
analysis apart from the smoothness and limit properties of the one-parameter
family of metrics. Our approach should provide a framework for systematically
calculating higher order corrections to gravitational self-force, including
higher multipole effects, although we do not attempt to go beyond first order
calculations here. The status of the MiSaTaQuWa equations is explained.
|
[{'version': 'v1', 'created': 'Thu, 19 Jun 2008 22:03:30 GMT'}
{'version': 'v2', 'created': 'Mon, 21 Jul 2008 14:50:18 GMT'}
{'version': 'v3', 'created': 'Mon, 18 Aug 2008 22:23:07 GMT'}
{'version': 'v4', 'created': 'Thu, 11 Sep 2008 21:05:54 GMT'}
{'version': 'v5', 'created': 'Fri, 29 Apr 2011 14:18:21 GMT'}]
|
2011-06-30
|
[array(['Gralla', 'Samuel E.', ''], dtype=object)
array(['Wald', 'Robert M.', ''], dtype=object)]
|
17,518 |
2202.04442
|
Lili Zhao
|
Lili Zhao, Wenlu Lin, Xing Fan, Yuanjun Song, Hong Lu, and Yang Liu
|
High Precision, Low Excitation Capactiance Measurement Methods from 10
mK- to Room-Temperature
| null | null |
10.1063/5.0087772
| null |
cond-mat.mes-hall
|
http://creativecommons.org/licenses/by/4.0/
|
Capacitance measurement is a useful technique in studying quantum devices, as
it directly probes the local particle charging properties, i.e. the system
compressibility. Here we report one approach which can measure capacitance from
mK to room temperature with excellent accuracy. Our experiments show that such
a high-precision technique is able to reveal delicate and essential properties
of high-mobility two-dimensional electron systems.
|
[{'version': 'v1', 'created': 'Wed, 9 Feb 2022 13:20:41 GMT'}]
|
2022-12-29
|
[array(['Zhao', 'Lili', ''], dtype=object)
array(['Lin', 'Wenlu', ''], dtype=object)
array(['Fan', 'Xing', ''], dtype=object)
array(['Song', 'Yuanjun', ''], dtype=object)
array(['Lu', 'Hong', ''], dtype=object)
array(['Liu', 'Yang', ''], dtype=object)]
|
17,519 |
1812.00495
|
Nikolaos Mavromatos
|
Nick E. Mavromatos and Sarben Sarkar
|
Finite-energy dressed string-inspired Dirac-like monopoles
|
16 pages rev tex
| null | null |
KCL-PH-TH/2018-67
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
On extending the Standard Model (SM) Lagrangian, through a non-linear
Born-Infeld (BI) hypercharge term with a parameter $\beta$ (of dimensions of
[mass]$^2$), a finite energy monopole solution was claimed by Arunasalam and
Kobakhidze [1]. We report on a new class of solutions within this framework
which was missed in the earlier analysis. This new class was discovered on
performing consistent analytic asymptotic analyses of the nonlinear
differential equations describing the model; the shooting method used in
numerical solutions to boundary value problems for ordinary differential
equations is replaced in our approach by a method which uses diagonal Pad\'e
approximants. Our work uses the ansatz proposed by Cho and Maison to generate a
static and spherically symmetric monopole with finite energy and differs from
that used in the solution of [1]. Estimates of the total energy of the monopole
are given, and detection prospects at colliders are briefly discussed.
|
[{'version': 'v1', 'created': 'Mon, 3 Dec 2018 00:29:14 GMT'}]
|
2018-12-04
|
[array(['Mavromatos', 'Nick E.', ''], dtype=object)
array(['Sarkar', 'Sarben', ''], dtype=object)]
|
17,520 |
1210.7110
|
Marcos Diniz
|
Jos\'e M. M. Veloso and Marcos M. Diniz
|
Gauss-Bonnet theorem in sub-Riemannian Heisenberg space $H^1$
|
12 pages
| null | null | null |
math.DG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We prove a version of Gauss-Bonnet theorem in sub-Riemannian Heisenberg space
$H^1$. The sub-Riemannian distance makes $H^1$ a metric space and consenquently
with a spherical Hausdorff measure. Using this measure, we define a Gaussian
curvature at points of a surface S where the sub-Riemannian distribution is
transverse to the tangent space of S. If all points of S have this property, we
prove a Gauss-Bonnet formula and for compact surfaces (which are topologically
a torus) we obtain $\int_S K = 0$.
|
[{'version': 'v1', 'created': 'Fri, 26 Oct 2012 12:17:25 GMT'}]
|
2012-10-29
|
[array(['Veloso', 'José M. M.', ''], dtype=object)
array(['Diniz', 'Marcos M.', ''], dtype=object)]
|
17,521 |
2204.03144
|
Hyungtae Lee
|
Hyungtae Lee and Sungmin Eum and Heesung Kwon
|
Exploring Cross-Domain Pretrained Model for Hyperspectral Image
Classification
|
Accept in IEEE TGRS
| null |
10.1109/TGRS.2022.3165441
| null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A pretrain-finetune strategy is widely used to reduce the overfitting that
can occur when data is insufficient for CNN training. First few layers of a CNN
pretrained on a large-scale RGB dataset are capable of acquiring general image
characteristics which are remarkably effective in tasks targeted for different
RGB datasets. However, when it comes down to hyperspectral domain where each
domain has its unique spectral properties, the pretrain-finetune strategy no
longer can be deployed in a conventional way while presenting three major
issues: 1) inconsistent spectral characteristics among the domains (e.g.,
frequency range), 2) inconsistent number of data channels among the domains,
and 3) absence of large-scale hyperspectral dataset.
We seek to train a universal cross-domain model which can later be deployed
for various spectral domains. To achieve, we physically furnish multiple inlets
to the model while having a universal portion which is designed to handle the
inconsistent spectral characteristics among different domains. Note that only
the universal portion is used in the finetune process. This approach naturally
enables the learning of our model on multiple domains simultaneously which acts
as an effective workaround for the issue of the absence of large-scale dataset.
We have carried out a study to extensively compare models that were trained
using cross-domain approach with ones trained from scratch. Our approach was
found to be superior both in accuracy and in training efficiency. In addition,
we have verified that our approach effectively reduces the overfitting issue,
enabling us to deepen the model up to 13 layers (from 9) without compromising
the accuracy.
|
[{'version': 'v1', 'created': 'Thu, 7 Apr 2022 01:09:42 GMT'}]
|
2022-04-08
|
[array(['Lee', 'Hyungtae', ''], dtype=object)
array(['Eum', 'Sungmin', ''], dtype=object)
array(['Kwon', 'Heesung', ''], dtype=object)]
|
17,522 |
gr-qc/0209068
|
Marcello Ortaggio
|
Marcello Ortaggio (Trento) and Jiri Podolsky (Prague)
|
Impulsive waves in electrovac direct product spacetimes with Lambda
|
6 pages, 1 figure, LaTeX 2e. To appear in Class. Quantum Grav
|
Class.Quant.Grav. 19 (2002) 5221-5227
|
10.1088/0264-9381/19/20/313
| null |
gr-qc hep-th
| null |
A complete family of non-expanding impulsive waves in spacetimes which are
the direct product of two 2-spaces of constant curvature is presented. In
addition to previously investigated impulses in Minkowski, (anti-)Nariai and
Bertotti-Robinson universes, a new explicit class of impulsive waves which
propagate in the exceptional electrovac Plebanski-Hacyan spacetimes with a
cosmological constant Lambda is constructed. In particular, pure gravitational
waves generated by null particles with an arbitrary multipole structure are
described. The metrics are impulsive members of a more general family of the
Kundt spacetimes of type II. The well-known pp-waves are recovered for
Lambda=0.
|
[{'version': 'v1', 'created': 'Fri, 20 Sep 2002 10:20:11 GMT'}]
|
2007-05-23
|
[array(['Ortaggio', 'Marcello', '', 'Trento'], dtype=object)
array(['Podolsky', 'Jiri', '', 'Prague'], dtype=object)]
|
17,523 |
1601.01521
|
Natalia Abuzyarova
|
Natalia Abuzyarova (Bashkir State University, Ufa, Russia)
|
Spectral synthesis for the differentiation operator in the Schwartz
space
|
19 pages
| null |
10.1134/S0001434617070161
| null |
math.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the spectral synthesis problem for the differentiation operator
D=d/dt in the Schwartz space E(a;b) and the dual problem of local description
for closed submodules in a special module of entire functions.
|
[{'version': 'v1', 'created': 'Thu, 7 Jan 2016 12:56:40 GMT'}]
|
2021-01-13
|
[array(['Abuzyarova', 'Natalia', '',
'Bashkir State University, Ufa, Russia'], dtype=object)]
|
17,524 |
1409.1361
|
Xiaoji Zhou
|
Xia Xu and Bo Qing and Xuzong Chen and Xiaoji Zhou
|
A simplified method for calculating the ac Stark shift of hyperfine
levels
|
7 pages, 5 figures
| null |
10.1016/j.physleta.2015.03.024
| null |
physics.atom-ph physics.optics
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The ac Stark shift of hyperfine levels of neutral atoms can be calculated
using the third order perturbation theory(TOPT), where the third order
corrections are quadratic in the atom-photon interaction and linear in the
hyperfine interaction. In this paper, we use Green's function to derive the
$E^{[2+\epsilon]}$ method which can give close values to those of TOPT for the
differential light shift between two hyperfine levels. It comes with a simple
form and easy incorporation of theoretical and experimental atomic structure
data. Furthermore, we analyze the order of approximation and give the condition
under which $E^{[2+\epsilon]}$ method is valid.
|
[{'version': 'v1', 'created': 'Thu, 4 Sep 2014 08:46:04 GMT'}]
|
2015-06-22
|
[array(['Xu', 'Xia', ''], dtype=object)
array(['Qing', 'Bo', ''], dtype=object)
array(['Chen', 'Xuzong', ''], dtype=object)
array(['Zhou', 'Xiaoji', ''], dtype=object)]
|
17,525 |
2112.14519
|
Arturo Fernandez
|
Arturo Fern\'andez-P\'erez, Evelia R. Garc\'ia Barroso and Nancy
Saravia-Molina
|
On Milnor and Tjurina numbers of foliations
|
35 pages, 3 figures
| null | null | null |
math.CV math.DS
|
http://creativecommons.org/licenses/by/4.0/
|
We study the relationship between the Milnor and Tjurina numbers of a
singular foliation $\mathcal{F}$, in the complex plane, with respect to a
balanced divisor of separatrices $\mathcal{B}$ for $\mathcal{F}$. For that, we
associated with $\mathcal{F}$ a new number called the $\chi$-number and we
prove that it is a $C^{1}$ invariant for holomorphic foliations. We compute the
polar excess number of $\mathcal{F}$ with respect to a balanced divisor of
separatrices $\mathcal{B}$ for $\mathcal{F}$, via the Milnor number of the
foliation, the multiplicity of some hamiltonian foliations along the
separatrices in the support of $\mathcal{B}$ and the $\chi$-number of
$\mathcal{F}$. On the other hand, we generalize, in the plane case and the
formal context, the well-known result of G\'omez-Mont given in the holomorphic
context, which establishes the equality between the GSV-index of the foliation
and the difference between the Tjurina number of the foliation and the Tjurina
number of a set of separatrices of $\mathcal{F}$. Finally, we state numerical
relationships between some classic indices, as Baum-Bott, Camacho-Sad, and
variational indices of a singular foliation and its Milnor and Tjurina numbers;
and we obtain a bound for the sum of Milnor numbers of the local separatrices
of a holomorphic foliation on the complex projective plane.
|
[{'version': 'v1', 'created': 'Wed, 29 Dec 2021 12:04:50 GMT'}
{'version': 'v2', 'created': 'Thu, 30 Jun 2022 12:19:08 GMT'}]
|
2022-07-01
|
[array(['Fernández-Pérez', 'Arturo', ''], dtype=object)
array(['Barroso', 'Evelia R. García', ''], dtype=object)
array(['Saravia-Molina', 'Nancy', ''], dtype=object)]
|
17,526 |
1306.1799
|
Naomi Murdoch
|
Naomi Murdoch, Patrick Michel, Derek C. Richardson, Kerstin Nordstrom,
Christian R. Berardi, Simon F. Green and Wolfgang Losert
|
Numerical simulations of granular dynamics II. Particle dynamics in a
shaken granular material
|
78 manuscript pages, 5 tables, 12 figures including 1 in colour
(online version only)
|
Icarus 219 (2012) 321-335
|
10.1016/j.icarus.2012.03.006
| null |
astro-ph.EP cond-mat.soft
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Surfaces of planets and small bodies of our Solar System are often covered by
a layer of granular material that can range from a fine regolith to a
gravel-like structure of varying depths. Therefore, the dynamics of granular
materials are involved in many events occurring during planetary and small-body
evolution thus contributing to their geological properties.
We demonstrate that the new adaptation of the parallel N-body hard-sphere
code pkdgrav has the capability to model accurately the key features of the
collective motion of bidisperse granular materials in a dense regime as a
result of shaking. As a stringent test of the numerical code we investigate the
complex collective ordering and motion of granular material by direct
comparison with laboratory experiments. We demonstrate that, as experimentally
observed, the scale of the collective motion increases with increasing
small-particle additive concentration.
We then extend our investigations to assess how self-gravity and external
gravity affect collective motion. In our reduced-gravity simulations both the
gravitational conditions and the frequency of the vibrations roughly match the
conditions on asteroids subjected to seismic shaking, though real regolith is
likely to be much more heterogeneous and less ordered than in our idealised
simulations. We also show that collective motion can occur in a granular
material under a wide range of inter-particle gravity conditions and in the
absence of an external gravitational field. These investigations demonstrate
the great interest of being able to simulate conditions that are to relevant
planetary science yet unreachable by Earth-based laboratory experiments.
|
[{'version': 'v1', 'created': 'Fri, 7 Jun 2013 18:09:12 GMT'}]
|
2013-06-10
|
[array(['Murdoch', 'Naomi', ''], dtype=object)
array(['Michel', 'Patrick', ''], dtype=object)
array(['Richardson', 'Derek C.', ''], dtype=object)
array(['Nordstrom', 'Kerstin', ''], dtype=object)
array(['Berardi', 'Christian R.', ''], dtype=object)
array(['Green', 'Simon F.', ''], dtype=object)
array(['Losert', 'Wolfgang', ''], dtype=object)]
|
17,527 |
1507.01858
|
Bryan Gillis
|
Bryan Gillis, Andy Taylor
|
A Generalized Method for Measuring Weak Lensing Magnification With
Weighted Number Counts
|
20 pages, 10 figures, submitted to MNRAS, first revision
| null |
10.1093/mnras/stv2737
| null |
astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a derivation of a generalized optimally-weighted estimator for the
weak lensing magnification signal, including a calculation of errors. With this
estimator, we present a local method for optimally estimating the local effects
of magnification from weak gravitational lensing, using a comparison of number
counts in an arbitrary region of space to the expected unmagnified number
counts. We show that when equivalent lens and source samples are used, this
estimator is simply related to the optimally-weighted correlation function
estimator used in past work and vice-versa, but this method has the benefits
that it can calculate errors with significantly less computational time, that
it can handle overlapping lens and source samples, and that it can easily be
extended to mass-mapping. We present a proof-of-principle test of this method
on data from the CFHTLenS, showing that its calculated magnification signals
agree with predictions from model fits to shear data. Finally, we investigate
how magnification data can be used to supplement shear data in determining the
best-fit model mass profiles for galaxy dark matter haloes. We find that at
redshifts greater than z ~ 0.6, the inclusion of magnification can often
significantly improve the constraints on the components of the mass profile
which relate to galaxies' local environments relative to shear alone, and in
high-redshift, low- and medium-mass bins, it can have a higher signal-to-noise
than the shear signal.
|
[{'version': 'v1', 'created': 'Tue, 7 Jul 2015 16:17:58 GMT'}
{'version': 'v2', 'created': 'Mon, 5 Oct 2015 10:55:36 GMT'}
{'version': 'v3', 'created': 'Thu, 19 Nov 2015 16:14:23 GMT'}]
|
2016-01-27
|
[array(['Gillis', 'Bryan', ''], dtype=object)
array(['Taylor', 'Andy', ''], dtype=object)]
|
17,528 |
1908.01430
|
Xingting Wang
|
Linhong Wang and Xingting Wang
|
A note on generic Clifford algebras of binary cubic forms
|
to appear Algebr. Represent. Theory
| null | null | null |
math.RA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the representation theoretic results of the binary cubic generic
Clifford algebra $\mathcal C$, which is an Artin-Schelter regular algebra of
global dimension five. In particular, we show that $\mathcal C$ is a PI algebra
of PI degree three and compute its point variety and discriminant ideals. As a
consequence, we give a necessary and sufficient condition on a binary cubic
form $f$ for the associated Clifford algebra $\mathcal C_f$ to be an Azumaya
algebra.
|
[{'version': 'v1', 'created': 'Mon, 5 Aug 2019 00:43:58 GMT'}
{'version': 'v2', 'created': 'Fri, 20 Sep 2019 11:57:03 GMT'}]
|
2019-09-23
|
[array(['Wang', 'Linhong', ''], dtype=object)
array(['Wang', 'Xingting', ''], dtype=object)]
|
17,529 |
2304.00220
|
Ryan Dorrill
|
Ryan Dorrill, and Jiffy Felis
|
Macroscopic Dynamics of Entangled 3+1-Dimensional Systems: A Novel
Investigation Into Why My MacBook Cable Tangles in My Backpack Every Single
Day
| null | null | null | null |
physics.ins-det
|
http://creativecommons.org/licenses/by/4.0/
|
A key axiom of equilibrium statistical physics is that all microstates are
equally probably in a thermally isolated system. Coupled with the laws of
Newtonian mechanics, quantum mechanics, chemistry, and thermal physics, one can
build from this axiom both complex and satisfactory models for macroscopic
phenomena. Here, we apply the precepts of statistical physics to a problem that
has puzzled scientists and engineers since its discovery in the 1980's: The
Entangled Laptop Cable Problem. Using a stochastic 2-dimensional simulation to
approximate projections of the 3+1-dimensional system, we shall see that the
overwhelmingly most probable state for a laptop cable is a severely tangled
one.
|
[{'version': 'v1', 'created': 'Sat, 1 Apr 2023 04:17:16 GMT'}]
|
2023-04-04
|
[array(['Dorrill', 'Ryan', ''], dtype=object)
array(['Felis', 'Jiffy', ''], dtype=object)]
|
17,530 |
1903.06676
|
James Barrett
|
James E. Barrett, Aylin Cakiroglu, Catey Bunce, Anoop Shah, Spiros
Denaxas
|
Selective recruitment designs for improving observational studies using
electronic health records
| null | null | null | null |
stat.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Large scale electronic health records (EHRs) present an opportunity to
quickly identify suitable individuals in order to directly invite them to
participate in an observational study. EHRs can contain data from millions of
individuals, raising the question of how to optimally select a cohort of size n
from a larger pool of size N. In this paper we propose a simple selective
recruitment protocol that selects a cohort in which covariates of interest tend
to have a uniform distribution. We show that selectively recruited cohorts
potentially offer greater statistical power and more accurate parameter
estimates than randomly selected cohorts. Our protocol can be applied to
studies with multiple categorical and continuous covariates. We apply our
protocol to a numerically simulated prospective observational study using an
EHR database of stable acute coronary disease patients from 82,089 individuals
in the U.K. Selective recruitment designs require a smaller sample size,
leading to more efficient and cost-effective studies.
|
[{'version': 'v1', 'created': 'Wed, 13 Feb 2019 17:36:39 GMT'}]
|
2019-03-18
|
[array(['Barrett', 'James E.', ''], dtype=object)
array(['Cakiroglu', 'Aylin', ''], dtype=object)
array(['Bunce', 'Catey', ''], dtype=object)
array(['Shah', 'Anoop', ''], dtype=object)
array(['Denaxas', 'Spiros', ''], dtype=object)]
|
17,531 |
2110.00173
|
Dongliang Zheng
|
Dongliang Zheng and Panagiotis Tsiotras
|
Batch Belief Trees for Motion Planning Under Uncertainty
| null | null | null | null |
cs.RO cs.SY eess.SY
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
In this work, we develop the Batch Belief Trees (BBT) algorithm for motion
planning under motion and sensing uncertainties. The algorithm interleaves
between batch sampling, building a graph of nominal trajectories in the state
space, and searching over the graph to find belief space motion plans. By
searching over the graph, BBT finds sophisticated plans that will visit (and
revisit) information-rich regions to reduce uncertainty. One of the key
benefits of this algorithm is the modified interplay between exploration and
exploitation. Instead of an exhaustive search (exploitation) after one
exploration step, the proposed algorithm uses batch samples to explore the
state space and, in addition, does not require exhaustive search before the
next iteration of batch sampling, which adds flexibility.The algorithm finds
motion plans that converge to the optimal one as more samples are added to the
graph. We test BBT in different planning environments. Our numerical
investigation confirms that BBT finds non-trivial motion plans and is faster
compared with previous similar methods.
|
[{'version': 'v1', 'created': 'Fri, 1 Oct 2021 02:07:20 GMT'}
{'version': 'v2', 'created': 'Fri, 21 Apr 2023 14:22:15 GMT'}]
|
2023-04-24
|
[array(['Zheng', 'Dongliang', ''], dtype=object)
array(['Tsiotras', 'Panagiotis', ''], dtype=object)]
|
17,532 |
1203.4739
|
Hans L. Fetter
|
Hans L. Fetter
|
Numerical exploration of a hexagonal string billiard
|
Preprint, 30 pages, 26 figures
|
Physica D, 241 (2012), no. 8, 830-846
|
10.1016/j.physd.2012.01.009
| null |
math-ph math.DS math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we are interested in the motion of a ball inside a billiard
table bounded by a particular smooth curve. This table belongs to a family of
billiards which can all be drawn by a common process: the so-called gardener's
string construction. The classical elliptical billiard is, of course, the
foremost member of this family. So it should come as no surprise that our
hexagonal string billiard shares many basic properties with the latter, but, on
the other hand, also exhibits some essential differences with it.
We have gathered numerical evidence against the Birkhoff-Poritsky conjecture.
|
[{'version': 'v1', 'created': 'Wed, 21 Mar 2012 14:05:24 GMT'}]
|
2012-03-26
|
[array(['Fetter', 'Hans L.', ''], dtype=object)]
|
17,533 |
1007.3702
|
Valentyna Abramenko
|
Valentyna Abramenko and Vasyl Yurchyshyn
|
Magnetic Energy Spectra in Active Regions
|
14 pages, 4 figures
| null |
10.1088/0004-637X/720/1/717
| null |
astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Line-of-sight magnetograms for 217 active regions (ARs) of different flare
rate observed at the solar disk center from January 1997 until December 2006
are utilized to study the turbulence regime and its relationship to the flare
productivity. Data from {\it SOHO}/MDI instrument recorded in the high
resolution mode and data from the BBSO magnetograph were used. The turbulence
regime was probed via magnetic energy spectra and magnetic dissipation spectra.
We found steeper energy spectra for ARs of higher flare productivity. We also
report that both the power index, $\alpha$, of the energy spectrum, $E(k) \sim
k^{-\alpha}$, and the total spectral energy $W=\int E(k)dk$ are comparably
correlated with the flare index, $A$, of an active region. The correlations are
found to be stronger than that found between the flare index and total unsigned
flux. The flare index for an AR can be estimated based on measurements of
$\alpha$ and $W$ as $A=10^b (\alpha W)^c$, with $b=-7.92 \pm 0.58$ and $c=1.85
\pm 0.13$. We found that the regime of the fully-developed turbulence occurs in
decaying ARs and in emerging ARs (at the very early stage of emergence).
Well-developed ARs display under-developed turbulence with strong magnetic
dissipation at all scales.
|
[{'version': 'v1', 'created': 'Wed, 21 Jul 2010 17:49:40 GMT'}]
|
2015-05-19
|
[array(['Abramenko', 'Valentyna', ''], dtype=object)
array(['Yurchyshyn', 'Vasyl', ''], dtype=object)]
|
17,534 |
1605.07794
|
Minghui Qin
|
J. Chen, W. Z. Zhuo, M. H. Qin, S. Dong, M. Zeng, X. B. Lu, X. S. Gao,
and J. -M. Liu
|
Effect of further-neighbor interactions on the magnetization behaviors
of the Ising model on a triangular lattice
|
17 pages, 5 figures, to be published in Journal of Physics: Condensed
Matter
|
Journal of Physics: Condensed Matter 28, 346004-2016
|
10.1088/0953-8984/28/34/346004
| null |
cond-mat.str-el
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we study the magnetization behaviors of the classical Ising
model on the triangular lattice using Monte Carlo simulations, and pay
particular attention to the effect of further-neighbor interactions. Several
fascinating spin states are identified to be stabilized in certain magnetic
field regions, respectively, resulting in the magnetization plateaus at 2/3,
5/7, 7/9 and 5/6 of the saturation magnetization MS, in addition to the well
known plateaus at 0, 1/3 and 1/2 of MS. The stabilization of these interesting
orders can be understood as the consequence of the competition between Zeeman
energy and exchange energy.
|
[{'version': 'v1', 'created': 'Wed, 25 May 2016 09:25:01 GMT'}]
|
2016-07-01
|
[array(['Chen', 'J.', ''], dtype=object)
array(['Zhuo', 'W. Z.', ''], dtype=object)
array(['Qin', 'M. H.', ''], dtype=object)
array(['Dong', 'S.', ''], dtype=object)
array(['Zeng', 'M.', ''], dtype=object)
array(['Lu', 'X. B.', ''], dtype=object)
array(['Gao', 'X. S.', ''], dtype=object)
array(['Liu', 'J. -M.', ''], dtype=object)]
|
17,535 |
2001.04812
|
Julian Renner
|
Sven Puchinger, Julian Renner, Johan Rosenkilde
|
Generic Decoding in the Sum-Rank Metric
| null | null | null | null |
cs.IT math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose the first non-trivial generic decoding algorithm for codes in the
sum-rank metric. The new method combines ideas of well-known generic decoders
in the Hamming and rank metric. For the same code parameters and number of
errors, the new generic decoder has a larger expected complexity than the known
generic decoders for the Hamming metric and smaller than the known rank-metric
decoders. Furthermore, we give a formal hardness reduction, providing evidence
that generic sum-rank decoding is computationally hard. As a by-product of the
above, we solve some fundamental coding problems in the sum-rank metric: we
give an algorithm to compute the exact size of a sphere of a given sum-rank
radius, and also give an upper bound as a closed formula; and we study erasure
decoding with respect to two different notions of support.
|
[{'version': 'v1', 'created': 'Tue, 14 Jan 2020 14:43:41 GMT'}
{'version': 'v2', 'created': 'Fri, 15 May 2020 13:20:57 GMT'}
{'version': 'v3', 'created': 'Thu, 17 Dec 2020 06:29:18 GMT'}
{'version': 'v4', 'created': 'Thu, 28 Oct 2021 12:44:17 GMT'}]
|
2021-10-29
|
[array(['Puchinger', 'Sven', ''], dtype=object)
array(['Renner', 'Julian', ''], dtype=object)
array(['Rosenkilde', 'Johan', ''], dtype=object)]
|
17,536 |
physics/0603240
|
William Walker D
|
William D. Walker
|
Superluminal Electromagnetic and Gravitational Fields Generated in the
Nearfield of Dipole Sources
| null | null | null | null |
physics.gen-ph
| null |
In this paper the fields generated by an electric dipole and a gravitational
quadrapole are shown to propagate superluminally in the nearfield of the source
and reduce to the speed of light as the fields propagate into the farfield. A
theoretical derivation of the generated fields using Maxwell's equations is
presented followed by a theoretical analysis of the phase and group speed of
the propagating fields. This theoretical prediction is then verified by a
numerical simulation which demonstrates the superluminal propagation of
modulated signals in the nearfield of their sources. An experiment using simple
dipole antennas is also presented which verifies the theoretically expected
superluminal propagation of transverse electromagnetic fields in the nearfield
of the source. The phase speed, group speed, and information speed of these
systems are compared and shown to differ. Provided the noise of a signal is
small and the modulation method is known, it is shown that the information
speed can be approximately the same as the superluminal group speed. According
to relativity theory, it is known that between moving reference frames,
superluminal signals can propagate backwards in time enabling violations of
causality. Several explanations are presented which may resolve this dilemma.
|
[{'version': 'v1', 'created': 'Tue, 28 Mar 2006 16:07:24 GMT'}]
|
2007-05-23
|
[array(['Walker', 'William D.', ''], dtype=object)]
|
17,537 |
2305.04616
|
Teofil Sidoruk
|
Jaime Arias, Carlos Olarte, Laure Petrucci, {\L}ukasz Ma\'sko,
Wojciech Penczek, Teofil Sidoruk
|
Optimal Scheduling of Agents in ADTrees: Specialised Algorithm and
Declarative Models
|
arXiv admin note: text overlap with arXiv:2101.06838
| null | null | null |
cs.MA
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
Expressing attack-defence trees in a multi-agent setting allows for studying
a new aspect of security scenarios, namely how the number of agents and their
task assignment impact the performance, e.g. attack time, of strategies
executed by opposing coalitions. Optimal scheduling of agents' actions, a
non-trivial problem, is thus vital. We discuss associated caveats and propose
an algorithm that synthesises such an assignment, targeting minimal attack time
and using the minimal number of agents for a given attack-defence tree. We also
investigate an alternative approach for the same problem using Rewriting Logic,
starting with a simple and elegant declarative model, whose correctness (in
terms of schedule's optimality) is self-evident. We then refine this
specification, inspired by the design of our specialised algorithm, to obtain
an efficient system that can be used as a playground to explore various aspects
of attack-defence trees. We compare the two approaches on different benchmarks.
|
[{'version': 'v1', 'created': 'Mon, 8 May 2023 10:51:08 GMT'}]
|
2023-05-09
|
[array(['Arias', 'Jaime', ''], dtype=object)
array(['Olarte', 'Carlos', ''], dtype=object)
array(['Petrucci', 'Laure', ''], dtype=object)
array(['Maśko', 'Łukasz', ''], dtype=object)
array(['Penczek', 'Wojciech', ''], dtype=object)
array(['Sidoruk', 'Teofil', ''], dtype=object)]
|
17,538 |
2106.09720
|
Jaejin Shin
|
Jaejin Shin, Jong-Hak Woo, Tohru Nagao, Minjin Kim, and Hyeonguk Bahk
|
Strong correlation between FeII/MgII ratio and Eddington ratio of type 1
Active galactic nuclei
|
14 pages, 9 figures, 4 tables, Accepted to Astrophysical Journal
| null |
10.3847/1538-4357/ac0adf
| null |
astro-ph.GA
|
http://creativecommons.org/licenses/by/4.0/
|
The FeII/MgII line flux ratio has been used as an indicator of the Fe/Mg
abundance ratio in the broad line region (BLR) of active galactic nuclei
(AGNs). On the basis of archival rest-frame UV spectra obtained via the Hubble
Space Telescope and the Sloan Digital Sky Survey, we investigate the FeII/MgII
ratios of type 1 AGNs at z < 2. Over wide dynamic ranges of AGN properties
(i.e., black hole mass, AGN luminosity, and Eddington ratio), we confirm that
the FeII/MgII ratio strongly correlates with Eddington ratio but not with black
hole mass, AGN luminosity, or redshift. Our results suggest that the
metallicity in the BLR are physically related to the accretion activity of
AGNs, but not to the global properties of galaxies (i.e., galaxy mass and
luminosity). With regard to the relation between the BLR metallicity and the
accretion rate of AGNs, we discuss that metal cooling may play an important
role in enhancing the gas inflow into the central region of host galaxies,
resulting in the high accretion rate of AGNs.
|
[{'version': 'v1', 'created': 'Thu, 17 Jun 2021 18:00:00 GMT'}]
|
2021-09-08
|
[array(['Shin', 'Jaejin', ''], dtype=object)
array(['Woo', 'Jong-Hak', ''], dtype=object)
array(['Nagao', 'Tohru', ''], dtype=object)
array(['Kim', 'Minjin', ''], dtype=object)
array(['Bahk', 'Hyeonguk', ''], dtype=object)]
|
17,539 |
1602.06566
|
Mohammad Islam
|
Dipayan Maiti and Mohammad Raihanul Islam and Scotland Leman and Naren
Ramakrishnan
|
Interactive Storytelling over Document Collections
|
This paper has been submitted to a conference for review
| null | null | null |
cs.AI cs.LG stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Storytelling algorithms aim to 'connect the dots' between disparate documents
by linking starting and ending documents through a series of intermediate
documents. Existing storytelling algorithms are based on notions of coherence
and connectivity, and thus the primary way by which users can steer the story
construction is via design of suitable similarity functions. We present an
alternative approach to storytelling wherein the user can interactively and
iteratively provide 'must use' constraints to preferentially support the
construction of some stories over others. The three innovations in our approach
are distance measures based on (inferred) topic distributions, the use of
constraints to define sets of linear inequalities over paths, and the
introduction of slack and surplus variables to condition the topic distribution
to preferentially emphasize desired terms over others. We describe experimental
results to illustrate the effectiveness of our interactive storytelling
approach over multiple text datasets.
|
[{'version': 'v1', 'created': 'Sun, 21 Feb 2016 18:46:35 GMT'}]
|
2016-02-23
|
[array(['Maiti', 'Dipayan', ''], dtype=object)
array(['Islam', 'Mohammad Raihanul', ''], dtype=object)
array(['Leman', 'Scotland', ''], dtype=object)
array(['Ramakrishnan', 'Naren', ''], dtype=object)]
|
17,540 |
2012.12668
|
Jan-e Alam Professor
|
Golam Sarwar, Md Hasanujjaman, Mahfuzur Rahaman, Abhijit Bhattacharyya
and Jan-e Alam
|
The fate of nonlinear perturbations near the QCD critical point
|
One LaTex file for text and 6 pdf files for figures
|
Physics Letters B 820 (2021) 136583
|
10.1016/j.physletb.2021.136583
| null |
nucl-th hep-ph nucl-ex
|
http://creativecommons.org/licenses/by/4.0/
|
The impact of the QCD critical point on the propagation of nonlinear waves
has been studied. The effects have been investigated within the scope of
second-order causal dissipative hydrodynamics by incorporating the critical
point into the equation of state, and the scaling behaviour of transport
coefficients and of thermodynamic response functions. Near the critical point,
the nonlinear waves are found to be significantly damped which may result in
the disappearance of the Mach cone effects of the away side jet. Such damping
may lead to enhancement in the fluctuations of elliptic and higher flow
coefficients. Therefore, the disappearance of Mach cone effects and the
enhancement of fluctuations in flow harmonics in the event-by-event analysis
may be considered as signals of the critical endpoint.
|
[{'version': 'v1', 'created': 'Wed, 23 Dec 2020 14:02:14 GMT'}
{'version': 'v2', 'created': 'Mon, 4 Jan 2021 04:10:47 GMT'}
{'version': 'v3', 'created': 'Mon, 23 Aug 2021 06:51:53 GMT'}]
|
2021-09-15
|
[array(['Sarwar', 'Golam', ''], dtype=object)
array(['Hasanujjaman', 'Md', ''], dtype=object)
array(['Rahaman', 'Mahfuzur', ''], dtype=object)
array(['Bhattacharyya', 'Abhijit', ''], dtype=object)
array(['Alam', 'Jan-e', ''], dtype=object)]
|
17,541 |
2306.12237
|
Sourav Pal
|
Sourav Pal and Saikat Roy
|
Dilation and Birkhoff-James orthogonality
|
31 pages, Submitted to journal
| null | null | null |
math.FA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the interaction between unitary $\rho$-dilations of a pair of
Hilbert space operators and Birkhoff-James orthogonality. We prove that for two
orthogonal operators $T,A$ if $\|T\|=\rho$, then $U_T \perp_B U_A$ for any
unitary $\rho$-dilations $U_T$ of $T$ and $U_A$ of $A$ acting on a common
space. We characterize $\varepsilon$-approximate Birkhoff-James orthogonality
for complex Hilbert space operators. Then find a sharp bound on $\varepsilon$
such that $T \perp_B A$ implies that $U_T \perp_B^{\varepsilon} U_A$ for any
unitary $\rho$-dilations $U_T, U_A$ of $T$ and $A$ respectively. The
Sch\"{a}ffer unitary dilations of a pair of contractions $T,A$ are not
orthogonal in general. We construct Sch\"{a}ffer-type unitary dilations for
contractions which are pairwise orthogonal.
|
[{'version': 'v1', 'created': 'Wed, 21 Jun 2023 12:56:16 GMT'}]
|
2023-06-22
|
[array(['Pal', 'Sourav', ''], dtype=object)
array(['Roy', 'Saikat', ''], dtype=object)]
|
17,542 |
2103.09418
|
Richard Brent
|
Richard P. Brent
|
On some results of Agelas concerning the GRH and of Vassilev-Missana
concerning the prime zeta function
|
7 pages, postscript added in v2
|
Notes on Number Theory and Discrete Mathematics 27, 2 (2021),
49-50
|
10.7546/nntdm.2021.27.2.49-50
| null |
math.NT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A recent paper by Ag\'elas [Generalized Riemann Hypothesis, 2019,
hal-00747680v3] claims to prove the Generalized Riemann Hypothesis (GRH) and,
as a special case, the Riemann Hypothesis (RH). We show that the proof given by
Ag\'elas contains an error. In particular, Lemma 2.3 of Ag\'elas is false. This
Lemma 2.3 is a generalisation of Theorem 1 of Vassilev-Missana [A note on prime
zeta function and Riemann zeta function, Notes on Number Theory and Discrete
Mathematics, 22, 4 (2016), 12-15]. We show by several independent methods that
Theorem 1 of Vassilev-Missana is false. We also show that Theorem 2 of
Vassilev-Missana is false.
This note has two aims. The first aim is to alert other researchers to these
errors so they do not rely on faulty results in their own work. The second aim
is pedagogical - we hope to show how these errors could have been detected
earlier, which may suggest how similar errors can be avoided, or at least
detected at an early stage.
|
[{'version': 'v1', 'created': 'Wed, 17 Mar 2021 03:13:29 GMT'}
{'version': 'v2', 'created': 'Sun, 21 Mar 2021 01:35:42 GMT'}]
|
2021-06-28
|
[array(['Brent', 'Richard P.', ''], dtype=object)]
|
17,543 |
0802.3323
|
Ivonne Sgura
|
Ray W. Ogden (Department of Mathematics, University of Glasgow,
Scotland, UK), Giuseppe Saccomandi (Dipartimento di Ingegneria Industriale,
Universita' degli Studi di Perugia, Italy), Ivonne Sgura (Dipartimento di
Matematica, Universita' del Salento, Lecce, Italy)
|
Phenomenological modeling of DNA overstretching
|
13 pages, 4 figures
| null | null | null |
q-bio.BM q-bio.QM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A phenomenological model based on the three-dimensional theory of nonlinear
elasticity is developed to describe the phenomenon of overstretching in the
force-extension curve for dsDNA. By using the concept of a material with
multiple reference configurations a single formula is obtained to fit the
force-extension curve.
|
[{'version': 'v1', 'created': 'Fri, 22 Feb 2008 14:14:34 GMT'}]
|
2008-02-25
|
[array(['Ogden', 'Ray W.', '',
'Department of Mathematics, University of Glasgow,\n Scotland, UK'],
dtype=object)
array(['Saccomandi', 'Giuseppe', '',
"Dipartimento di Ingegneria Industriale,\n Universita' degli Studi di Perugia, Italy"],
dtype=object)
array(['Sgura', 'Ivonne', '',
"Dipartimento di\n Matematica, Universita' del Salento, Lecce, Italy"],
dtype=object) ]
|
17,544 |
2009.00941
|
Remi Geiger
|
Nicolas Mielec, Ranjita Sapam, Constance Poulain, Arnaud Landragin,
Andrea Bertoldi, Philippe Bouyer, Benjamin Canuel and Remi Geiger
|
Degenerate optical resonator for the enhancement of large laser beams
|
15 pages, 28 references
|
Optics Express Vol. 28, Issue 26, pp. 39112-39127 (2020)
|
10.1364/OE.409293
| null |
physics.optics physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Enhancement cavities where a beam of large size (several millimeters) can
resonate have several applications, in particular in atomic physics. However,
reaching large beam waists in a compact geometry (less than a meter long)
typically brings the resonator close to the degeneracy limit. Here we
experimentally study a degenerate optical cavity, 44-cm long and consisting of
two flat mirrors placed in the focal planes of a lens, in a regime of
intermediate finesse ($\sim 150$). We study the impact of the longitudinal
misalignement on the optical gain, for different input beam waists up to
5.6~mm, and find data consistent with the prediction of a model based on ABCD
propagation of Gaussian beams. We reach an optical gain of 26 for a waist of
1.4~mm, which can have an impact on several applications, in particular atom
interferometry. We numerically investigate the optical gain reduction for large
beam waists using the angular spectrum method to consider the effects of
optical aberrations, which play an important role in such a degenerate cavity.
Our calculations quantitatively reproduce the experimental data and will
provide a key tool for designing enhancement cavities close to the degeneracy
limit. As an illustration, we discuss the application of this resonator
geometry to the enhancement of laser beams with top-hat intensity profiles.
|
[{'version': 'v1', 'created': 'Wed, 2 Sep 2020 10:42:10 GMT'}
{'version': 'v2', 'created': 'Mon, 14 Dec 2020 11:00:55 GMT'}]
|
2020-12-15
|
[array(['Mielec', 'Nicolas', ''], dtype=object)
array(['Sapam', 'Ranjita', ''], dtype=object)
array(['Poulain', 'Constance', ''], dtype=object)
array(['Landragin', 'Arnaud', ''], dtype=object)
array(['Bertoldi', 'Andrea', ''], dtype=object)
array(['Bouyer', 'Philippe', ''], dtype=object)
array(['Canuel', 'Benjamin', ''], dtype=object)
array(['Geiger', 'Remi', ''], dtype=object)]
|
17,545 |
2301.08156
|
Tanja Behrle
|
T. Behrle, T. L. Nguyen, F. Reiter, D. Baur, B. de Neeve, M. Stadler,
M. Marinelli, F. Lancellotti, S. F. Yelin and J. P. Home
|
A phonon laser in the quantum regime
| null | null | null | null |
quant-ph physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We demonstrate a trapped-ion system with two competing dissipation channels,
implemented independently on two ion species co-trapped in a Paul trap. By
controlling coherent spin-oscillator couplings and optical pumping rates we
explore the phase diagram of this system, which exhibits a regime analogous to
that of a (phonon) laser but operates close to the quantum ground state with an
average phonon number of $\bar{n}<10$. We demonstrate phase locking of the
oscillator to an additional resonant drive, and also observe the phase
diffusion of the resulting state under dissipation by reconstructing the
quantum state from a measurement of the characteristic function.
|
[{'version': 'v1', 'created': 'Thu, 19 Jan 2023 16:20:41 GMT'}]
|
2023-01-20
|
[array(['Behrle', 'T.', ''], dtype=object)
array(['Nguyen', 'T. L.', ''], dtype=object)
array(['Reiter', 'F.', ''], dtype=object)
array(['Baur', 'D.', ''], dtype=object)
array(['de Neeve', 'B.', ''], dtype=object)
array(['Stadler', 'M.', ''], dtype=object)
array(['Marinelli', 'M.', ''], dtype=object)
array(['Lancellotti', 'F.', ''], dtype=object)
array(['Yelin', 'S. F.', ''], dtype=object)
array(['Home', 'J. P.', ''], dtype=object)]
|
17,546 |
1910.05182
|
Takahiro Morimoto
|
Takahiro Morimoto, Naoto Nagaosa
|
Shift current from electromagnon excitations in multiferroics
|
8 pages, 4 figures
|
Phys. Rev. B 100, 235138 (2019)
|
10.1103/PhysRevB.100.235138
| null |
cond-mat.str-el cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Electromagnon is the spin wave in multiferroic materials and is known to
accompany electric polarization due to the cross correlation between the charge
and spin. Here, we theoretically show that the electromagnons also induce dc
current upon their photoexcitations. The proposed dc current response
originates from the shift current mechanism which is characterized by the so
called shift vector, a geometric quantity of the Bloch wavefunctions.
|
[{'version': 'v1', 'created': 'Fri, 11 Oct 2019 13:38:39 GMT'}
{'version': 'v2', 'created': 'Wed, 25 Dec 2019 02:02:19 GMT'}]
|
2019-12-30
|
[array(['Morimoto', 'Takahiro', ''], dtype=object)
array(['Nagaosa', 'Naoto', ''], dtype=object)]
|
17,547 |
2109.08058
|
Matteo G. A. Paris
|
Alessandro Candeloro, Sholeh Razavian, Matteo Piccolini, Berihu Teklu,
Stefano Olivares, and Matteo G. A. Paris
|
Quantum probes for the characterization of nonlinear media
| null | null |
10.3390/e23101353
| null |
quant-ph
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
Active optical media leading to interaction Hamiltonians of the form $ H =
\tilde{\lambda}\, (a + a^{\dagger})^{\zeta}$ represent a crucial resource for
quantum optical technology. In this paper, we address the characterization of
those nonlinear media using quantum probes, as opposed to semiclassical ones.
In particular, we investigate how squeezed probes may improve individual and
joint estimation of the nonlinear coupling $\tilde{\lambda}$ and of the
nonlinearity order $\zeta$. Upon using tools from quantum estimation, we show
that: i) the two parameters are compatible, i.e. the may be jointly estimated
without additional quantum noise; ii) the use of squeezed probes improves
precision at fixed overall energy of the probe; iii) for low energy probes,
squeezed vacuum represent the most convenient choice, whereas for increasing
energy an optimal squeezing fraction may be determined; iv) using optimized
quantum probes, the scaling of the corresponding precision with energy
improves, both for individual and joint estimation of the two parameters,
compared to semiclassical coherent probes. We conclude that quantum probes
represent a resource to enhance precision in the characterization of nonlinear
media, and foresee potential applications with current technology.
|
[{'version': 'v1', 'created': 'Thu, 16 Sep 2021 15:40:36 GMT'}
{'version': 'v2', 'created': 'Mon, 18 Oct 2021 13:34:17 GMT'}]
|
2021-11-03
|
[array(['Candeloro', 'Alessandro', ''], dtype=object)
array(['Razavian', 'Sholeh', ''], dtype=object)
array(['Piccolini', 'Matteo', ''], dtype=object)
array(['Teklu', 'Berihu', ''], dtype=object)
array(['Olivares', 'Stefano', ''], dtype=object)
array(['Paris', 'Matteo G. A.', ''], dtype=object)]
|
17,548 |
1806.09982
|
Walter Gessner Dr.
|
Walter Gessner
|
Intrinsic operator time of stochastic systems
| null | null | null | null |
quant-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Stochastic systems consisting of a very large number of independent
elementary processes of the same kind, especially the radioactive decay, are
considered as quantum clocks. By adapting the framework of the previously
introduced concept of ideal quantum clocks, the time operator for these systems
is derived and discussed. It is shown that the standard deviation of time
measurement by such a stochastic device is bounded from below by the limitation
of the number of elementary processes from physical reasons and by the
Planck-time. As a result, any time dilatation, whether caused by extreme speed
of the quantum clock or by gravitational fields, increases the standard
deviation. This reduces the accuracy of time measurements especially in space
navigation. In the vicinity of the Schwarzschild spherical shell of a black
hole, time measurements are completely blurred and thus impossible.
|
[{'version': 'v1', 'created': 'Sat, 23 Jun 2018 16:01:50 GMT'}]
|
2018-06-27
|
[array(['Gessner', 'Walter', ''], dtype=object)]
|
17,549 |
1811.04210
|
Yi Tay
|
Yi Tay, Luu Anh Tuan, Siu Cheung Hui, Jian Su
|
Densely Connected Attention Propagation for Reading Comprehension
|
NIPS 2018
| null | null | null |
cs.CL cs.AI cs.IR cs.NE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose DecaProp (Densely Connected Attention Propagation), a new densely
connected neural architecture for reading comprehension (RC). There are two
distinct characteristics of our model. Firstly, our model densely connects all
pairwise layers of the network, modeling relationships between passage and
query across all hierarchical levels. Secondly, the dense connectors in our
network are learned via attention instead of standard residual skip-connectors.
To this end, we propose novel Bidirectional Attention Connectors (BAC) for
efficiently forging connections throughout the network. We conduct extensive
experiments on four challenging RC benchmarks. Our proposed approach achieves
state-of-the-art results on all four, outperforming existing baselines by up to
$2.6\%-14.2\%$ in absolute F1 score.
|
[{'version': 'v1', 'created': 'Sat, 10 Nov 2018 07:54:13 GMT'}
{'version': 'v2', 'created': 'Tue, 2 Apr 2019 11:19:54 GMT'}]
|
2019-04-03
|
[array(['Tay', 'Yi', ''], dtype=object)
array(['Tuan', 'Luu Anh', ''], dtype=object)
array(['Hui', 'Siu Cheung', ''], dtype=object)
array(['Su', 'Jian', ''], dtype=object)]
|
17,550 |
2004.05433
|
Daniel A. Quiroz
|
Daniel A. Quiroz
|
Clique immersions in graphs of independence number two with certain
forbidden subgraphs
|
14 pages, 3 figures. The statements of lemmas 3.1, 4.1, and 4.2 are
slightly changed from the previous version in order to fix some minor errors
in the proofs of theorems 3.2 and 4.3. Shorter proof of Proposition 5.2 given
| null | null | null |
math.CO
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
The Lescure-Meyniel conjecture is the analogue of Hadwiger's conjecture for
the immersion order. It states that every graph $G$ contains the complete graph
$K_{\chi(G)}$ as an immersion, and like its minor-order counterpart it is open
even for graphs with independence number 2. We show that every graph $G$ with
independence number $\alpha(G)\ge 2$ and no hole of length between $4$ and
$2\alpha(G)$ satisfies this conjecture. In particular, every $C_4$-free graph
$G$ with $\alpha(G)= 2$ satisfies the Lescure-Meyniel conjecture. We give
another generalisation of this corollary, as follows. Let $G$ and $H$ be graphs
with independence number at most 2, such that $|V(H)|\le 4$. If $G$ is
$H$-free, then $G$ satisfies the Lescure-Meyniel conjecture.
|
[{'version': 'v1', 'created': 'Sat, 11 Apr 2020 16:02:21 GMT'}
{'version': 'v2', 'created': 'Mon, 22 Feb 2021 20:16:56 GMT'}]
|
2021-02-24
|
[array(['Quiroz', 'Daniel A.', ''], dtype=object)]
|
17,551 |
2004.03468
|
Ivan Matvienko
|
Ivan Matvienko, Mikhail Gasanov, Anna Petrovskaia, Raghavendra Belur
Jana, Maria Pukalchik, Ivan Oseledets
|
Bayesian aggregation improves traditional single image crop
classification approaches
|
Paper presented at the ICLR 2020 Workshop on Computer Vision for
Agriculture (CV4A)
| null | null | null |
cs.CV cs.LG eess.IV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Machine learning (ML) methods and neural networks (NN) are widely implemented
for crop types recognition and classification based on satellite images.
However, most of these studies use several multi-temporal images which could be
inapplicable for cloudy regions. We present a comparison between the classical
ML approaches and U-Net NN for classifying crops with a single satellite image.
The results show the advantages of using field-wise classification over
pixel-wise approach. We first used a Bayesian aggregation for field-wise
classification and improved on 1.5% results between majority voting
aggregation. The best result for single satellite image crop classification is
achieved for gradient boosting with an overall accuracy of 77.4% and macro
F1-score 0.66.
|
[{'version': 'v1', 'created': 'Tue, 7 Apr 2020 15:14:03 GMT'}]
|
2020-04-08
|
[array(['Matvienko', 'Ivan', ''], dtype=object)
array(['Gasanov', 'Mikhail', ''], dtype=object)
array(['Petrovskaia', 'Anna', ''], dtype=object)
array(['Jana', 'Raghavendra Belur', ''], dtype=object)
array(['Pukalchik', 'Maria', ''], dtype=object)
array(['Oseledets', 'Ivan', ''], dtype=object)]
|
17,552 |
1806.09174
|
Noshaba Cheema
|
Noshaba Cheema, Somayeh Hosseini, Janis Sprenger, Erik Herrmann, Han
Du, Klaus Fischer, Philipp Slusallek
|
Dilated Temporal Fully-Convolutional Network for Semantic Segmentation
of Motion Capture Data
|
Eurographics/ ACM SIGGRAPH Symposium on Computer Animation - Posters
2018;
$\href{http://people.mpi-inf.mpg.de/~ncheema/SCA2018_poster.pdf}{\textit{Poster
can be found here.}}$
| null |
10.2312/sca.20181185
| null |
cs.CV cs.GR cs.LG cs.NE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Semantic segmentation of motion capture sequences plays a key part in many
data-driven motion synthesis frameworks. It is a preprocessing step in which
long recordings of motion capture sequences are partitioned into smaller
segments. Afterwards, additional methods like statistical modeling can be
applied to each group of structurally-similar segments to learn an abstract
motion manifold. The segmentation task however often remains a manual task,
which increases the effort and cost of generating large-scale motion databases.
We therefore propose an automatic framework for semantic segmentation of motion
capture data using a dilated temporal fully-convolutional network. Our model
outperforms a state-of-the-art model in action segmentation, as well as three
networks for sequence modeling. We further show our model is robust against
high noisy training labels.
|
[{'version': 'v1', 'created': 'Sun, 24 Jun 2018 16:40:07 GMT'}]
|
2018-07-17
|
[array(['Cheema', 'Noshaba', ''], dtype=object)
array(['Hosseini', 'Somayeh', ''], dtype=object)
array(['Sprenger', 'Janis', ''], dtype=object)
array(['Herrmann', 'Erik', ''], dtype=object)
array(['Du', 'Han', ''], dtype=object)
array(['Fischer', 'Klaus', ''], dtype=object)
array(['Slusallek', 'Philipp', ''], dtype=object)]
|
17,553 |
1805.12570
|
Steven Herbert
|
Steven Herbert
|
On the depth overhead incurred when running quantum algorithms on
near-term quantum computers with limited qubit connectivity
|
16 pages, 4 figures. Update: minor changes - accepted by QIC
| null | null | null |
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper addresses the problem of finding the depth overhead that will be
incurred when running quantum circuits on near-term quantum computers.
Specifically, it is envisaged that near-term quantum computers will have low
qubit connectivity: each qubit will only be able to interact with a subset of
the other qubits, a reality typically represented by a qubit interaction graph
in which a vertex represents a qubit and an edge represents a possible direct
2-qubit interaction (gate). Thus the depth overhead is unavoidably incurred by
introducing swap gates into the quantum circuit to enable general qubit
interactions. This paper proves that there exist quantum circuits where a depth
overhead in $\Omega(\log n)$ must necessarily be incurred when running quantum
circuits with $n$ qubits on quantum computers whose qubit interaction graph has
finite degree, but that such a logarithmic depth overhead is achievable. The
latter is shown by the construction of a 4-regular qubit interaction graph and
associated compilation algorithm that can execute any quantum circuit with only
a logarithmic depth overhead.
|
[{'version': 'v1', 'created': 'Thu, 31 May 2018 17:26:29 GMT'}
{'version': 'v2', 'created': 'Thu, 5 Jul 2018 17:42:44 GMT'}
{'version': 'v3', 'created': 'Wed, 22 Aug 2018 15:42:54 GMT'}
{'version': 'v4', 'created': 'Tue, 25 Sep 2018 14:02:12 GMT'}
{'version': 'v5', 'created': 'Tue, 28 Jul 2020 15:54:27 GMT'}]
|
2020-07-29
|
[array(['Herbert', 'Steven', ''], dtype=object)]
|
17,554 |
1507.05198
|
John Wettlaufer S
|
Srikanth Toppaladoddi and J. S. Wettlaufer
|
Theory of the sea ice thickness distribution
|
3 pages, 2 figures
| null |
10.1103/PhysRevLett.115.148501
| null |
physics.ao-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We use concepts from statistical physics to transform the original evolution
equation for the sea ice thickness distribution $g(h)$ due to Thorndike et al.,
(1975) into a Fokker-Planck like conservation law. The steady solution is $g(h)
= {\cal N}(q) h^q \mathrm{e}^{-~ h/H}$, where $q$ and $H$ are expressible in
terms of moments over the transition probabilities between thickness
categories. The solution exhibits the functional form used in observational
fits and shows that for $h \ll 1$, $g(h)$ is controlled by both thermodynamics
and mechanics, whereas for $h \gg 1$ only mechanics controls $g(h)$. Finally,
we derive the underlying Langevin equation governing the dynamics of the ice
thickness $h$, from which we predict the observed $g(h)$. The genericity of our
approach provides a framework for studying the geophysical scale structure of
the ice pack using methods of broad relevance in statistical mechanics.
|
[{'version': 'v1', 'created': 'Sat, 18 Jul 2015 15:50:21 GMT'}
{'version': 'v2', 'created': 'Sat, 22 Aug 2015 03:05:41 GMT'}]
|
2015-10-28
|
[array(['Toppaladoddi', 'Srikanth', ''], dtype=object)
array(['Wettlaufer', 'J. S.', ''], dtype=object)]
|
17,555 |
gr-qc/0212105
|
Kostas Kokkotas
|
K.D.Kokkotas and J.Ruoff
|
Instabilities of Relativistic Stars
|
41 pages, 12 figures, Proceedings of the 25th John Hopkins Workshop,
Florence
| null |
10.1142/9789812791368_0019
| null |
gr-qc astro-ph
| null |
Recent developments on the rotational instabilities of relativistic stars are
reviewed. The article provides an account of the theory of stellar
instabilities with emphasis on the rotational ones. Special attention is being
paid to the study of these instabilities in the general relativistic regime.
Issues such as the existence relativistic r-modes, the existence of a
continuous spectrum and the CFS instability of the w-modes are discussed in the
second half of the article.
|
[{'version': 'v1', 'created': 'Thu, 26 Dec 2002 01:44:54 GMT'}]
|
2017-08-23
|
[array(['Kokkotas', 'K. D.', ''], dtype=object)
array(['Ruoff', 'J.', ''], dtype=object)]
|
17,556 |
2110.08068
|
Peter Nightingale
|
Miquel Bofill and Jordi Coll and Peter Nightingale and Josep Suy and
Felix Ulrich-Oltean and Mateu Villaret
|
SAT Encodings for Pseudo-Boolean Constraints Together With At-Most-One
Constraints
| null | null |
10.1016/j.artint.2021.103604
| null |
cs.AI
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
When solving a combinatorial problem using propositional satisfiability
(SAT), the encoding of the problem is of vital importance. We study encodings
of Pseudo-Boolean (PB) constraints, a common type of arithmetic constraint that
appears in a wide variety of combinatorial problems such as timetabling,
scheduling, and resource allocation. In some cases PB constraints occur
together with at-most-one (AMO) constraints over subsets of their variables
(forming PB(AMO) constraints). Recent work has shown that taking account of
AMOs when encoding PB constraints using decision diagrams can produce a
dramatic improvement in solver efficiency. In this paper we extend the approach
to other state-of-the-art encodings of PB constraints, developing several new
encodings for PB(AMO) constraints. Also, we present a more compact and
efficient version of the popular Generalized Totalizer encoding, named Reduced
Generalized Totalizer. This new encoding is also adapted for PB(AMO)
constraints for a further gain. Our experiments show that the encodings of
PB(AMO) constraints can be substantially smaller than those of PB constraints.
PB(AMO) encodings allow many more instances to be solved within a time limit,
and solving time is improved by more than one order of magnitude in some cases.
We also observed that there is no single overall winner among the considered
encodings, but efficiency of each encoding may depend on PB(AMO)
characteristics such as the magnitude of coefficient values.
|
[{'version': 'v1', 'created': 'Fri, 15 Oct 2021 12:53:01 GMT'}]
|
2021-10-18
|
[array(['Bofill', 'Miquel', ''], dtype=object)
array(['Coll', 'Jordi', ''], dtype=object)
array(['Nightingale', 'Peter', ''], dtype=object)
array(['Suy', 'Josep', ''], dtype=object)
array(['Ulrich-Oltean', 'Felix', ''], dtype=object)
array(['Villaret', 'Mateu', ''], dtype=object)]
|
17,557 |
1605.02703
|
Adrian Madsen
|
Adrian Madsen, Sam McKagan and Eleanor C Sayre
|
Resource Letter: RBAI-1: Research-based Assessment Instruments in
Physics and Astronomy
| null | null |
10.1119/1.4977416
| null |
physics.ed-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This resource letter provides a guide to research-based assessment
instruments (RBAIs) of physics and astronomy content. These are standardized
assessments that were rigorously developed and revised using student ideas and
interviews, expert input, and statistical analyses. RBAIs have had a major
impact on physics and astronomy education reform by providing a universal and
convincing measure of student understanding that instructors can use to assess
and improve the effectiveness of their teaching. In this resource letter, we
present an overview of all content RBAIs in physics and astronomy by topic,
research validation, instructional level, format, and themes, to help faculty
find the best assessment for their course.
|
[{'version': 'v1', 'created': 'Mon, 9 May 2016 19:19:59 GMT'}
{'version': 'v2', 'created': 'Thu, 16 Jun 2016 20:15:35 GMT'}]
|
2017-04-05
|
[array(['Madsen', 'Adrian', ''], dtype=object)
array(['McKagan', 'Sam', ''], dtype=object)
array(['Sayre', 'Eleanor C', ''], dtype=object)]
|
17,558 |
2302.14022
|
Hanan Aldarmaki
|
Hanan Aldarmaki and Ahmad Ghannam
|
Diacritic Recognition Performance in Arabic ASR
| null | null | null | null |
cs.CL
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an analysis of diacritic recognition performance in Arabic
Automatic Speech Recognition (ASR) systems. As most existing Arabic speech
corpora do not contain all diacritical marks, which represent short vowels and
other phonetic information in Arabic script, current state-of-the-art ASR
models do not produce full diacritization in their output. Automatic text-based
diacritization has previously been employed both as a pre-processing step to
train diacritized ASR, or as a post-processing step to diacritize the resulting
ASR hypotheses. It is generally believed that input diacritization degrades ASR
performance, but no systematic evaluation of ASR diacritization performance,
independent of ASR performance, has been conducted to date. In this paper, we
attempt to experimentally clarify whether input diacritiztation indeed degrades
ASR quality, and to compare the diacritic recognition performance against
text-based diacritization as a post-processing step. We start with pre-trained
Arabic ASR models and fine-tune them on transcribed speech data with different
diacritization conditions: manual, automatic, and no diacritization. We isolate
diacritic recognition performance from the overall ASR performance using
coverage and precision metrics. We find that ASR diacritization significantly
outperforms text-based diacritization in post-processing, particularly when the
ASR model is fine-tuned with manually diacritized transcripts.
|
[{'version': 'v1', 'created': 'Mon, 27 Feb 2023 18:27:42 GMT'}]
|
2023-02-28
|
[array(['Aldarmaki', 'Hanan', ''], dtype=object)
array(['Ghannam', 'Ahmad', ''], dtype=object)]
|
17,559 |
1901.00345
|
Ben-Zhang Yang
|
Ben-zhang Yang, Xinjiang He, Nan-jing Huang
|
Equilibrium price and optimal insider trading strategy under stochastic
liquidity with long memory
|
21 pages; 2 figures
| null | null | null |
q-fin.MF
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, the Kyle model of insider trading is extended by
characterizing the trading volume with long memory and allowing the noise
trading volatility to follow a general stochastic process. Under this newly
revised model, the equilibrium conditions are determined, with which the
optimal insider trading strategy, price impact and price volatility are
obtained explicitly. The volatility of the price volatility appears excessive,
which is a result of the fact that a more aggressive trading strategy is chosen
by the insider when uninformed volume is higher. The optimal trading strategy
turns out to possess the property of long memory, and the price impact is also
affected by the fractional noise.
|
[{'version': 'v1', 'created': 'Wed, 2 Jan 2019 12:47:45 GMT'}
{'version': 'v2', 'created': 'Mon, 7 Jan 2019 08:25:56 GMT'}]
|
2019-01-08
|
[array(['Yang', 'Ben-zhang', ''], dtype=object)
array(['He', 'Xinjiang', ''], dtype=object)
array(['Huang', 'Nan-jing', ''], dtype=object)]
|
17,560 |
nucl-th/9802067
|
Daniel Phillips
|
D.R. Phillips, S.J. Wallace (University of Maryland), N.K.Devine
(General Sciences Corporation)
|
Electron-deuteron scattering in a current-conserving description of
relativistic bound states: formalism and impulse approximation calculations
|
42 pages, RevTeX
|
Phys.Rev.C58:2261-2282,1998
|
10.1103/PhysRevC.58.2261
|
DOE/ER/40762-146, U. of Md PP# 98-095
|
nucl-th
| null |
The electromagnetic interactions of a relativistic two-body bound state are
formulated in three dimensions using an equal-time (ET) formalism. This
involves a systematic reduction of four-dimensional dynamics to a
three-dimensional form by integrating out the time components of relative
momenta. A conserved electromagnetic current is developed for the ET formalism.
It is shown that consistent truncations of the electromagnetic current and the
$NN$ interaction kernel may be made, order-by-order in the coupling constants,
such that appropriate Ward-Takahashi identities are satisfied. A meson-exchange
model of the $NN$ interaction is used to calculate deuteron vertex functions.
Calculations of electromagnetic form factors for elastic scattering of
electrons by deuterium are performed using an impulse-approximation current.
Negative-energy components of the deuteron's vertex function and retardation
effects in the meson-exchange interaction are found to have only minor effects
on the deuteron form factors.
|
[{'version': 'v1', 'created': 'Mon, 23 Feb 1998 17:42:52 GMT'}]
|
2008-11-26
|
[array(['Phillips', 'D. R.', '', 'University of Maryland'], dtype=object)
array(['Wallace', 'S. J.', '', 'University of Maryland'], dtype=object)
array(['Devine', 'N. K.', '', 'General Sciences Corporation'],
dtype=object) ]
|
17,561 |
1810.08452
|
Rodrigo Caye Daudt
|
Rodrigo Caye Daudt, Bertrand Le Saux, Alexandre Boulch, Yann Gousseau
|
Multitask Learning for Large-scale Semantic Change Detection
|
Preprint submitted to Computer Vision and Image Understanding
| null | null | null |
cs.CV cs.LG
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
Change detection is one of the main problems in remote sensing, and is
essential to the accurate processing and understanding of the large scale Earth
observation data available through programs such as Sentinel and Landsat. Most
of the recently proposed change detection methods bring deep learning to this
context, but openly available change detection datasets are still very scarce,
which limits the methods that can be proposed and tested. In this paper we
present the first large scale high resolution semantic change detection (HRSCD)
dataset, which enables the usage of deep learning methods for semantic change
detection. The dataset contains coregistered RGB image pairs, pixel-wise change
information and land cover information. We then propose several methods using
fully convolutional neural networks to perform semantic change detection. Most
notably, we present a network architecture that performs change detection and
land cover mapping simultaneously, while using the predicted land cover
information to help to predict changes. We also describe a sequential training
scheme that allows this network to be trained without setting a hyperparameter
that balances different loss functions and achieves the best overall results.
|
[{'version': 'v1', 'created': 'Fri, 19 Oct 2018 12:01:51 GMT'}
{'version': 'v2', 'created': 'Wed, 28 Aug 2019 15:29:38 GMT'}]
|
2019-08-29
|
[array(['Daudt', 'Rodrigo Caye', ''], dtype=object)
array(['Saux', 'Bertrand Le', ''], dtype=object)
array(['Boulch', 'Alexandre', ''], dtype=object)
array(['Gousseau', 'Yann', ''], dtype=object)]
|
17,562 |
2110.11579
|
Ziv Scully
|
Ziv Scully, Mor Harchol-Balter
|
How to Schedule Near-Optimally under Real-World Constraints
| null | null | null | null |
cs.PF
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Scheduling is a critical part of practical computer systems, and scheduling
has also been extensively studied from a theoretical perspective.
Unfortunately, there is a gap between theory and practice, as the optimal
scheduling policies presented by theory can be difficult or impossible to
perfectly implement in practice. In this work, we use recent breakthroughs in
queueing theory to begin to bridge this gap. We show how to translate
theoretically optimal policies -- which provably minimize mean response time
(a.k.a. latency) -- into near-optimal policies that are easily implemented in
practical settings. Specifically, we handle the following real-world
constraints:
- We show how to schedule in systems where job sizes (a.k.a. running time)
are unknown, or only partially known. We do so using simple policies that
achieve performance very close to the much more complicated theoretically
optimal policies.
- We show how to schedule in systems that have only a limited number of
priority levels available. We show how to adapt theoretically optimal policies
to this constrained setting and determine how many levels we need for
near-optimal performance.
- We show how to schedule in systems where job preemption can only happen at
specific checkpoints. Adding checkpoints allows for smarter scheduling, but
each checkpoint incurs time overhead. We give a rule of thumb that
near-optimally balances this tradeoff.
|
[{'version': 'v1', 'created': 'Fri, 22 Oct 2021 04:15:19 GMT'}]
|
2021-10-25
|
[array(['Scully', 'Ziv', ''], dtype=object)
array(['Harchol-Balter', 'Mor', ''], dtype=object)]
|
17,563 |
1804.00098
|
Jaime Klapp
|
E. de la Cruz-S\'anchez, J. Klapp, E. Mayoral-Villa, R.
Gonz\'alez-Gal\'an, A. M. G\'omez-Torres, C. E. Alvarado-Rodr\'iguez
|
Numerical simulation of a temporary repository of radioactive material
| null | null | null | null |
physics.comp-ph physics.geo-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The use of computer simulations techniques is an advantageous tool in order
to evaluate and select the most appropriated site for radionuclides
confinement. Modelling different scenarios allow to take decisions about which
is the most safety place for the final repository. In this work, a
bidimensional numerical simulation model for the analysis of dispersion of
contaminants trough a saturated porous media using finite element method (FEM),
was applied to study the transport of radioisotopes in a temporary nuclear
repository localized in the Vadose Zone at Pe\~na Blanca, M\'exico. The 2D
model used consider the Darcy's law for calculating the velocity field, which
is the input data for in a second computation to solve the mass transport
equation. Taking into account radionuclides decay the transport of long lived
U-series daughters such as ${}^{238}\!\text{U}$, ${}^{234}\!\text{U}$, and
${}^{230}\!\text{Th}$ is evaluated. The model was validated using experimental
data reported in the literature obtaining good agreement between the numerical
results and the available experimental data. The simulations show preferential
routes that the contaminant plume follows over time. The radionuclide flow is
highly irregular and it is influenced by failures in the area and its
interactions in the fluid-solid matrix. The resulting radionuclide
concentration distribution is as expected. The most important result of this
work is the development of a validated model to describe the migration of
radionuclides in saturated porous media with some fractures.
|
[{'version': 'v1', 'created': 'Sat, 31 Mar 2018 00:56:41 GMT'}]
|
2018-04-03
|
[array(['de la Cruz-Sánchez', 'E.', ''], dtype=object)
array(['Klapp', 'J.', ''], dtype=object)
array(['Mayoral-Villa', 'E.', ''], dtype=object)
array(['González-Galán', 'R.', ''], dtype=object)
array(['Gómez-Torres', 'A. M.', ''], dtype=object)
array(['Alvarado-Rodríguez', 'C. E.', ''], dtype=object)]
|
17,564 |
0908.0376
|
Michael Hinczewski
|
Michael Hinczewski, Roland R. Netz
|
Anisotropic Hydrodynamic Mean-Field Theory for Semiflexible Polymers
under Tension
|
22 pages, 9 figures; revised version with additional calculations and
experimental comparison; accepted for publication in Macromolecules
| null | null | null |
cond-mat.soft q-bio.BM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce an anisotropic mean-field approach for the dynamics of
semiflexible polymers under intermediate tension, the force range where a chain
is partially extended but not in the asymptotic regime of a nearly straight
contour. The theory is designed to exactly reproduce the lowest order
equilibrium averages of a stretched polymer, and treats the full complexity of
the problem: the resulting dynamics include the coupled effects of long-range
hydrodynamic interactions, backbone stiffness, and large-scale polymer contour
fluctuations. Validated by Brownian hydrodynamics simulations and comparison to
optical tweezer measurements on stretched DNA, the theory is highly accurate in
the intermediate tension regime over a broad dynamical range, without the need
for additional dynamic fitting parameters.
|
[{'version': 'v1', 'created': 'Tue, 4 Aug 2009 02:26:31 GMT'}
{'version': 'v2', 'created': 'Wed, 13 Jul 2011 16:32:55 GMT'}]
|
2011-07-14
|
[array(['Hinczewski', 'Michael', ''], dtype=object)
array(['Netz', 'Roland R.', ''], dtype=object)]
|
17,565 |
2204.06016
|
Jacob Aguilar
|
Jacob B. Aguilar, Michael M. Tom
|
Convergence of Solutions of the BBM and BBM-KP Model Equations
| null | null | null | null |
math.AP math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Benjamin-Bona-Mahony (BBM) equation has proven to be a good approximation
for the unidirectional propagation of small amplitude long waves in a channel
where the crosswise variation can be safely ignored. The
Benjamin-Bona-Mahony-Kadomtsev-Petviashvili (BBM-KP) equation is the
regularized version of the Kadomtsev-Petviashvili equation which arises in
various modeling scenarios corresponding to nonlinear dispersive waves that
propagate principally along the $x$-axis with weak dispersive effects undergone
in the direction parallel to the $y$-axis and normal to the primary direction
of propagation. There is much literature on mathematical studies regarding
these well known equations, however the relationship between the solutions of
their underlying pure initial value problems is not fully understood. In this
work, it is shown that the solution of the Cauchy problem for the BBM-KP
equation converges to the solution of the Cauchy problem for the BBM equation
in a suitable function space, provided that the initial data for both equations
are close as the transverse variable $y \rightarrow \pm \infty$.
|
[{'version': 'v1', 'created': 'Tue, 12 Apr 2022 18:00:21 GMT'}]
|
2022-04-14
|
[array(['Aguilar', 'Jacob B.', ''], dtype=object)
array(['Tom', 'Michael M.', ''], dtype=object)]
|
17,566 |
0904.3001
|
Daniel Manzano
|
S. Lopez-Rosa, D. Manzano, J. S. Dehesa
|
Complexity of D-dimensional hydrogenic systems in position and momentum
spaces
|
14 pages, 3 figures, accepted in Physica A
|
Physica A 388 (2009) 15
|
10.1016/j.physa.2009.04.023
| null |
quant-ph math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The internal disorder of a D-dimensional hydrogenic system, which is strongly
associated to the non-uniformity of the quantum-mechanical density of its
physical states, is investigated by means of the shape complexity in the two
reciprocal spaces. This quantity, which is the product of the disequilibrium or
averaging density and the Shannon entropic power, is mathematically expressed
for both ground and excited stationary states in terms of certain entropic
functionals of Laguerre and Gegenbauer (or ultraspherical) polynomials. We
emphasize the ground and circular states, where the complexity is explicitly
calculated and discussed by means of the quantum numbers and dimensionality.
Finally, the position and momentum shape complexities are numerically discussed
for various physical states and dimensionalities, and the dimensional and
Rydberg energy limits as well as their associated uncertainty products are
explicitly given. As a byproduct, it is shown that the shape complexity of the
system in a stationary state does not depend on the strength of the Coulomb
potential involved.
|
[{'version': 'v1', 'created': 'Mon, 20 Apr 2009 11:04:28 GMT'}
{'version': 'v2', 'created': 'Wed, 16 Sep 2009 07:52:42 GMT'}]
|
2015-05-13
|
[array(['Lopez-Rosa', 'S.', ''], dtype=object)
array(['Manzano', 'D.', ''], dtype=object)
array(['Dehesa', 'J. S.', ''], dtype=object)]
|
17,567 |
1607.02766
|
Mohammad Mozaffari
|
Mohammad Mozaffari, Walid Saad, Mehdi Bennis, and Merouane Debbah
|
Mobile Internet of Things: Can UAVs Provide an Energy-Efficient Mobile
Architecture?
|
Accepted in IEEE Global Communications Conference (GLOBECOM), 2016
| null | null | null |
cs.IT math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, the optimal trajectory and deployment of multiple unmanned
aerial vehicles (UAVs), used as aerial base stations to collect data from
ground Internet of Things (IoT) devices, is investigated. In particular, to
enable reliable uplink communications for IoT devices with a minimum energy
consumption, a new approach for optimal mobility of the UAVs is proposed.
First, given a fixed ground IoT network, the total transmit power of the
devices is minimized by properly clustering the IoT devices with each cluster
being served by one UAV. Next, to maintain energy-efficient communications in
time-varying mobile IoT networks, the optimal trajectories of the UAVs are
determined by exploiting the framework of optimal transport theory. Simulation
results show that by using the proposed approach, the total transmit power of
IoT devices for reliable uplink communications can be reduced by 56% compared
to the fixed Voronoi deployment method. Moreover, our results yield the optimal
paths that will be used by UAVs to serve the mobile IoT devices with a minimum
energy consumption.
|
[{'version': 'v1', 'created': 'Sun, 10 Jul 2016 17:27:19 GMT'}]
|
2016-07-12
|
[array(['Mozaffari', 'Mohammad', ''], dtype=object)
array(['Saad', 'Walid', ''], dtype=object)
array(['Bennis', 'Mehdi', ''], dtype=object)
array(['Debbah', 'Merouane', ''], dtype=object)]
|
17,568 |
2012.14068
|
Luke Finnerty
|
Luke Finnerty (1), Cam Buzard (1), Stefan Pelletier (2), Danielle
Piskorz (1), Alexandra C. Lockwood (3), Chad F. Bender (4), Bj\"orn Benneke
(2) and Geoffrey A. Blake (1) ((1) Caltech (2) Universit\'e de Montr\'eal (3)
Space Telescope Science Institute (4) University of Arizona)
|
Contrast and Temperature Dependence of Multi-Epoch High-Resolution
Cross-Correlation Exoplanet Spectroscopy
|
22 pages, 8 figures, accepted to AJ
| null |
10.3847/1538-3881/abd6ec
| null |
astro-ph.EP
|
http://creativecommons.org/licenses/by/4.0/
|
While high-resolution cross-correlation spectroscopy (HRCCS) techniques have
proven effective at characterizing the atmospheres of transiting and
non-transiting hot Jupiters, the limitations of these techniques are not well
understood. We present a series of simulations of one HRCCS technique, which
combines the cross-correlation functions from multiple epochs, to place
temperature and contrast limits on the accessible exoplanet population for the
first time. We find that planets approximately Saturn-size and larger within
$\sim$0.2 AU of a Sun-like star are likely to be detectable with current
instrumentation in the $L$-band, a significant expansion compared with the
previously-studied population. Cooler ($ \rm T_{eq} \leq 1000$ K) exoplanets
are more detectable than suggested by their photometric contrast alone as a
result of chemical changes which increase spectroscopic contrast. The $L$-band
CH$_4$ spectrum of cooler exoplanets enables robust constraints on the
atmospheric C/O ratio at $\rm T_{eq} \sim 900K$, which have proven difficult to
obtain for hot Jupiters. These results suggest that the multi-epoch approach to
HRCCS can detect and characterize exoplanet atmospheres throughout the inner
regions of Sun-like systems with existing high-resolution spectrographs. We
find that many epochs of modest signal-to-noise ($\rm S/N_{epoch} \sim 1500$)
yield the clearest detections and constraints on C/O, emphasizing the need for
high-precision near-infrared telluric correction with short integration times.
|
[{'version': 'v1', 'created': 'Mon, 28 Dec 2020 02:29:39 GMT'}]
|
2021-02-10
|
[array(['Finnerty', 'Luke', ''], dtype=object)
array(['Buzard', 'Cam', ''], dtype=object)
array(['Pelletier', 'Stefan', ''], dtype=object)
array(['Piskorz', 'Danielle', ''], dtype=object)
array(['Lockwood', 'Alexandra C.', ''], dtype=object)
array(['Bender', 'Chad F.', ''], dtype=object)
array(['Benneke', 'Björn', ''], dtype=object)
array(['Blake', 'Geoffrey A.', ''], dtype=object)]
|
17,569 |
1507.07190
|
Daoyi Dong
|
Daoyi Dong, Mohamed A. Mabrok, Ian R. Petersen, Bo Qi, Chunlin Chen,
Herschel Rabitz
|
Sampling-based Learning Control for Quantum Systems with Uncertainties
|
11 pages, 9 figures, in press, IEEE Transactions on Control Systems
Technology, 2015
|
IEEE Transactions on Control Systems Technology, 2015, Vol. 23,
pp. 2155-2166
|
10.1109/TCST.2015.2404292
| null |
quant-ph cs.SY
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Robust control design for quantum systems has been recognized as a key task
in the development of practical quantum technology. In this paper, we present a
systematic numerical methodology of sampling-based learning control (SLC) for
control design of quantum systems with uncertainties. The SLC method includes
two steps of "training" and "testing". In the training step, an augmented
system is constructed using artificial samples generated by sampling
uncertainty parameters according to a given distribution. A gradient flow based
learning algorithm is developed to find the control for the augmented system.
In the process of testing, a number of additional samples are tested to
evaluate the control performance where these samples are obtained through
sampling the uncertainty parameters according to a possible distribution. The
SLC method is applied to three significant examples of quantum robust control
including state preparation in a three-level quantum system, robust
entanglement generation in a two-qubit superconducting circuit and quantum
entanglement control in a two-atom system interacting with a quantized field in
a cavity. Numerical results demonstrate the effectiveness of the SLC approach
even when uncertainties are quite large, and show its potential for robust
control design of quantum systems.
|
[{'version': 'v1', 'created': 'Sun, 26 Jul 2015 11:35:07 GMT'}]
|
2016-03-29
|
[array(['Dong', 'Daoyi', ''], dtype=object)
array(['Mabrok', 'Mohamed A.', ''], dtype=object)
array(['Petersen', 'Ian R.', ''], dtype=object)
array(['Qi', 'Bo', ''], dtype=object)
array(['Chen', 'Chunlin', ''], dtype=object)
array(['Rabitz', 'Herschel', ''], dtype=object)]
|
17,570 |
astro-ph/0603481
|
Niccolo' Bucciantini
|
N. Bucciantini (1), L. Del Zanna (2) ((1) Astronomy Dep., Univ. of
California at Berkeley, (2) Dipartimento di Astronomia, Univ. di Firenze)
|
Local Kelvin-Helmholtz instability and synchrotron modulation in Pulsar
Wind Nebulae
|
10 pages, 7 figures, Accepted for publication in A&A
| null |
10.1051/0004-6361:20054491
| null |
astro-ph
| null |
We present here a series of numerical simulations of the development of
Kelvin-Helmholtz instability in a relativistically hot plasma. The physical
parameters in the unperturbed state are chosen to be representative of local
conditions encountered in Pulsar Wind Nebulae (PWNe), with a main magnetic
field perpendicular to a mildly relativistic shear layers. By using a numerical
code for Relativistic MHD, we investigate the effect of an additional magnetic
field component aligned with the shear velocity, and we follow the evolution of
the instability to the saturation and turbulent regimes. Based on the resulting
flow structure, we then compute synchrotron maps in order to evaluate the
signature of Kelvin-Helmholtz instability on the emission and we investigate
how the time scale and the amplitude of the synchrotron modulations depend on
shear velocity and magnetic field. Finally we compare our results to the
observed variable features in the Crab Nebula. We show that the
Kelvin-Helmholtz instability cannot account for the wisps variability, but it
might be responsible for the time dependent filamentary structure observed in
the main torus.
|
[{'version': 'v1', 'created': 'Fri, 17 Mar 2006 20:41:54 GMT'}]
|
2009-11-11
|
[array(['Bucciantini', 'N.', ''], dtype=object)
array(['Del Zanna', 'L.', ''], dtype=object)]
|
17,571 |
1212.4115
|
Stephan Zimmer
|
Stephan Zimmer, Luisa Arrabito, Tom Glanzman, Tony Johnson, Claudia
Lavalley and Andrei Tsaregorodtsev
|
Extending the Fermi-LAT Data Processing Pipeline to the Grid
|
This is an author-created, un-copyedited version of an article
accepted for publication in Journal of Physics: Conference Series. IOP
Publishing Ltd is not responsible for any errors or omissions in this version
of the manuscript or any version derived from it. The Version of Record is
available online at http://dx.doi.org/10.1088/1742-6596/396/3/032121
|
2012 J. Phys.: Conf. Ser. 396 032121
|
10.1088/1742-6596/396/3/032121
| null |
astro-ph.IM cs.DC hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Data Handling Pipeline ("Pipeline") has been developed for the Fermi
Gamma-Ray Space Telescope (Fermi) Large Area Telescope (LAT) which launched in
June 2008. Since then it has been in use to completely automate the production
of data quality monitoring quantities, reconstruction and routine analysis of
all data received from the satellite and to deliver science products to the
collaboration and the Fermi Science Support Center. Aside from the
reconstruction of raw data from the satellite (Level 1), data reprocessing and
various event-level analyses are also reasonably heavy loads on the pipeline
and computing resources. These other loads, unlike Level 1, can run
continuously for weeks or months at a time. In addition it receives heavy use
in performing production Monte Carlo tasks.
The software comprises web-services that allow online monitoring and provides
charts summarizing work flow aspects and performance information. The server
supports communication with several batch systems such as LSF and BQS and
recently also Sun Grid Engine and Condor. This is accomplished through
dedicated job control services that for Fermi are running at SLAC and the other
computing site involved in this large scale framework, the Lyon computing
center of IN2P3. While being different in the logic of a task, we evaluate a
separate interface to the Dirac system in order to communicate with EGI sites
to utilize Grid resources, using dedicated Grid optimized systems rather than
developing our own. (abstract abridged)
|
[{'version': 'v1', 'created': 'Mon, 17 Dec 2012 19:39:23 GMT'}]
|
2012-12-18
|
[array(['Zimmer', 'Stephan', ''], dtype=object)
array(['Arrabito', 'Luisa', ''], dtype=object)
array(['Glanzman', 'Tom', ''], dtype=object)
array(['Johnson', 'Tony', ''], dtype=object)
array(['Lavalley', 'Claudia', ''], dtype=object)
array(['Tsaregorodtsev', 'Andrei', ''], dtype=object)]
|
17,572 |
1308.1709
|
Pablo Poggi
|
P. M. Poggi, F. C. Lombardo, D. A. Wisniacki
|
Quantum Speed Limit and optimal evolution time in a two-level system
|
(6 pages, 5 figures). The paper has been modified after discussion
with peers, which revealed misconceptions about the ideas of quantum speed
limit and optimal evolution time. The focus of the article has been moved to
the relation between both concepts in a quantum control scenario
|
EPL 104 (2013) 40005
|
10.1209/0295-5075/104/40005
| null |
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Quantum mechanics establishes a fundamental bound for the minimum evolution
time between two states of a given system. Known as the quantum speed limit
(QSL), it is a useful tool in the context of quantum control, where the speed
of some control protocol is usually intended to be as large as possible. While
QSL expressions for time-independent hamiltonians have been well studied, the
time-dependent regime has remained somewhat unexplored, albeit being usually
the relevant problem to be compared with when studying systems controlled by
external fields. In this paper we explore the relation between optimal times
found in quantum control and the QSL bound, in the (relevant) time-dependent
regime, by discussing the ubiquitous two-level Landau-Zener type hamiltonian.
|
[{'version': 'v1', 'created': 'Wed, 7 Aug 2013 22:26:45 GMT'}
{'version': 'v2', 'created': 'Sat, 7 Sep 2013 18:50:02 GMT'}
{'version': 'v3', 'created': 'Tue, 24 Dec 2013 13:33:01 GMT'}]
|
2013-12-25
|
[array(['Poggi', 'P. M.', ''], dtype=object)
array(['Lombardo', 'F. C.', ''], dtype=object)
array(['Wisniacki', 'D. A.', ''], dtype=object)]
|
17,573 |
1410.4664
|
Teresa Bermudez
|
T. Berm\'udez, A. Bonilla and N. Feldman
|
On convex-cyclic operators
|
19 pages
| null | null | null |
math.FA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We give a Hahn-Banach Characterization for convex-cyclicity. We also obtain
an example of a bounded linear operator $S$ on a Banach space with
$\sigma_{p}(S^*)=\emptyset$ such that $S$ is convex-cyclic, but $S$ is not
weakly hypercyclic and $S^2 $ is not convex-cyclic. This solved two questions
of Rezaei in \cite{Rezaei} when $\sigma_p(S^*)=\varnothing$. %Recently,
Le\'on-Saavedra and Romero de la Rosa \cite{LeRo} provide an example of a
convex-cyclic operator $S$ such that the power $S^n$ fails to be convex-cyclic
with $\sigma _p(S^*)\neq \varnothing$. In fact they solved tree questions posed
by Rezaei in \cite{Rezaei}. Moreover, we prove that $m$-isometries are not
convex-cyclic and that $\varepsilon$-hypercyclic operators are convex-cyclic.
We also characterize the diagonalizable normal operators that are
convex-cyclic and give a condition on the eigenvalues of an arbitrary operator
for it to be convex-cyclic. We show that certain adjoint multiplication
operators are convex-cyclic and show that some are convex-cyclic but no convex
polynomial of the operator is hypercyclic. Also some adjoint multiplication
operators are convex-cyclic but not 1-weakly hypercyclic.
|
[{'version': 'v1', 'created': 'Fri, 17 Oct 2014 08:48:44 GMT'}]
|
2014-10-20
|
[array(['Bermúdez', 'T.', ''], dtype=object)
array(['Bonilla', 'A.', ''], dtype=object)
array(['Feldman', 'N.', ''], dtype=object)]
|
17,574 |
1808.06982
|
Yuncheng Zhong
|
Yuncheng Zhong, Yevgeniy Vinogradskiy, Liyuan Chen, Nick Myziuk,
Richard Castillo, Edward Castillo, Thomas Guerrero, Steve Jiang, and Jing
Wang
|
Deriving ventilation imaging from 4DCT by deep convolutional neural
network
| null | null |
10.1002/mp.13421
| null |
physics.med-ph eess.IV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Purpose: Functional imaging is emerging as an important tool for lung cancer
treatment planning and evaluation. Compared with traditional methods such as
nuclear medicine ventilation-perfusion (VQ), positron emission tomography
(PET), single photon emission computer tomography (SPECT), or magnetic
resonance imaging (MRI), which use contrast agents to form 2D or 3D functional
images, ventilation imaging obtained from 4DCT lung images is convenient and
cost-effective because of its availability during radiation treatment planning.
Current methods of obtaining ventilation images from 4DCT lung images involve
deformable image registration (DIR) and a density (HU) change-based algorithm
(DIR/HU); therefore the resulting ventilation images are sensitive to the
selection of DIR algorithms. Methods: We propose a deep convolutional neural
network (CNN)-based method to derive the ventilation images from 4DCT directly
without explicit DIR, thereby improving consistency and accuracy of ventilation
images. A total of 82 sets of 4DCT and ventilation images from patients with
lung cancer were studied using this method. Results: The predicted images were
comparable to the label images of the test data. The similarity index and
correlation coefficient averaged over the ten-fold cross validation were
0.883+-0.034 and 0.878+-0.028, respectively. Conclusions: The results
demonstrate that deep CNN can generate ventilation imaging from 4DCT without
explicit deformable image registration, reducing the associated uncertainty.
|
[{'version': 'v1', 'created': 'Tue, 21 Aug 2018 16:01:19 GMT'}]
|
2019-06-19
|
[array(['Zhong', 'Yuncheng', ''], dtype=object)
array(['Vinogradskiy', 'Yevgeniy', ''], dtype=object)
array(['Chen', 'Liyuan', ''], dtype=object)
array(['Myziuk', 'Nick', ''], dtype=object)
array(['Castillo', 'Richard', ''], dtype=object)
array(['Castillo', 'Edward', ''], dtype=object)
array(['Guerrero', 'Thomas', ''], dtype=object)
array(['Jiang', 'Steve', ''], dtype=object)
array(['Wang', 'Jing', ''], dtype=object)]
|
17,575 |
hep-th/9806177
|
Angel Uranga
|
H. Garcia-Compean, A. M. Uranga
|
Brane Box Realization of Chiral Gauge Theories in Two Dimensions
|
48 pages, 10 eps figures, uses harvmac. Minor corrections, footnote
on conventions added
|
Nucl.Phys.B539:329-366,1999
|
10.1016/S0550-3213(98)00725-1
|
IASSNS-HEP-98/58
|
hep-th
| null |
We study type IIA configurations of D4 branes and three kinds of NS
fivebranes. The D4 brane world-volume has finite extent in three directions,
giving rise to a two-dimensional low-energy field theory. The models have
generically $(0,2)$ supersymmetry. We determine the rules to read off the
spectrum and interactions of the field theory from the brane box configuration
data. We discuss the construction of theories with enhanced $(0,4)$, $(0,6)$
and $(0,8)$ supersymmetry. Using T-duality along the directions in which the D4
branes are finite, the configuration can be mapped to D1 branes at
$\IC^4/\Gamma$ singularities, with $\Gamma$ an abelian subgroup of SU(4). This
provides a rederivation of the rules in the brane box model. The enhancement of
supersymmetry has a nice geometrical interpretation in the singularity picture
in terms of the holonomy group of the four-fold singularity.
|
[{'version': 'v1', 'created': 'Sun, 21 Jun 1998 02:51:42 GMT'}
{'version': 'v2', 'created': 'Wed, 8 Jul 1998 15:45:56 GMT'}]
|
2009-10-09
|
[array(['Garcia-Compean', 'H.', ''], dtype=object)
array(['Uranga', 'A. M.', ''], dtype=object)]
|
17,576 |
2301.04229
|
Santosh Ganji
|
Santosh Ganji, Jaewon Kim, Romil Sonigra, P. R. Kumar
|
TERRA: Beam Management for Outdoor mm-Wave Networks
| null | null | null | null |
eess.SY cs.SY eess.SP
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
mm-Wave communication systems use narrow directional beams due to the
spectrum's characteristic nature: high path and penetration losses. The mobile
and the base station primarily employ beams in line of sight (LoS) direction
and when needed in non-line of sight direction. Beam management protocol adapts
the base station and mobile side beam direction during user mobility and to
sustain the link during blockages. To avoid outage in transient pedestrian
blockage of the LoS path, the mobile uses reflected or NLoS path available in
indoor environments. Reflected paths can sustain time synchronization and
maintain connectivity during temporary blockages. In outdoor environments, such
reflections may not be available and prior work relied on dense base station
deployment or co-ordinated multi-point access to address outage problem.
Instead of dense and hence cost-intensive network deployments, we found
experimentally that the mobile can capitalize on ground reflection. We
developed TERRA protocol to effectively handle mobile side beam direction
during transient blockage events. TERRA avoids outage during pedestrian
blockages 84.5 $\%$ of the time in outdoor environments on concrete and gravel
surfaces. TERRA also enables the mobile to perform a soft handover to a reserve
neighbor base station in the event of a permanent blockage, without requiring
any side information, unlike the existing works. Evaluations show that TERRA
maintains received signal strength close to the optimal solution while keeping
track of the neighbor base station.
|
[{'version': 'v1', 'created': 'Tue, 10 Jan 2023 22:30:46 GMT'}]
|
2023-01-12
|
[array(['Ganji', 'Santosh', ''], dtype=object)
array(['Kim', 'Jaewon', ''], dtype=object)
array(['Sonigra', 'Romil', ''], dtype=object)
array(['Kumar', 'P. R.', ''], dtype=object)]
|
17,577 |
hep-th/9711107
|
Michael Gutperle
|
M.B. Green (DAMTP, University of Cambridge, UK) and M. Gutperle
(Princeton University, USA)
|
D-particle bound states and the D-instanton measure
|
12 pages, harvmac(b), no figures, references added, typos corrected,
version to appear in JHEP
|
JHEP 9801:005,1998
|
10.1088/1126-6708/1998/01/005
|
DAMTP-97-121, PUPT-1745
|
hep-th
| null |
A connection is made between the Witten index of relevance to threshold bound
states of D-particles in the type IIA superstring theory and the measure that
enters D-instanton sums for processes dominated by single multiply-charged
D-instantons in the type IIB theory.
|
[{'version': 'v1', 'created': 'Mon, 17 Nov 1997 23:48:12 GMT'}
{'version': 'v2', 'created': 'Fri, 30 Jan 1998 15:10:55 GMT'}]
|
2010-02-03
|
[array(['Green', 'M. B.', '', 'DAMTP, University of Cambridge, UK'],
dtype=object)
array(['Gutperle', 'M.', '', 'Princeton University, USA'], dtype=object)]
|
17,578 |
cs/0405046
|
Ajith Abraham
|
Ajith Abraham and Ravi Jain
|
Soft Computing Models for Network Intrusion Detection Systems
| null |
Soft Computing in Knowledge Discovery: Methods and Applications,
Saman Halgamuge and Lipo Wang (Eds.), Studies in Fuzziness and Soft
Computing, Springer Verlag Germany, Chapter 16, 20 pages, 2004
| null | null |
cs.CR
| null |
Security of computers and the networks that connect them is increasingly
becoming of great significance. Computer security is defined as the protection
of computing systems against threats to confidentiality, integrity, and
availability. There are two types of intruders: external intruders, who are
unauthorized users of the machines they attack, and internal intruders, who
have permission to access the system with some restrictions. This chapter
presents a soft computing approach to detect intrusions in a network. Among the
several soft computing paradigms, we investigated fuzzy rule-based classifiers,
decision trees, support vector machines, linear genetic programming and an
ensemble method to model fast and efficient intrusion detection systems.
Empirical results clearly show that soft computing approach could play a major
role for intrusion detection.
|
[{'version': 'v1', 'created': 'Thu, 13 May 2004 23:27:03 GMT'}]
|
2007-05-23
|
[array(['Abraham', 'Ajith', ''], dtype=object)
array(['Jain', 'Ravi', ''], dtype=object)]
|
17,579 |
astro-ph/0012003
|
Jonathan C. Tan
|
Jonathan C. Tan (1), Christopher D. Matzner (2), Christopher F. McKee
(1,3) ((1) Dept. of Astronomy, UC Berkeley; (2) CITA; (3) Dept. of Physics,
UC Berkeley)
|
Trans-Relativistic Blast Waves in Supernovae as Gamma-Ray Burst
Progenitors
|
Accepted to ApJ; minor changes from previous version; 41 pages
(including 12 figures)
| null |
10.1086/320245
| null |
astro-ph
| null |
We investigate the acceleration of shock waves to relativistic velocities in
the outer layers of exploding stars. By concentrating the explosion energy in
the outermost ejecta, such trans-relativistic blast waves can serve as the
progenitors of gamma-ray bursts (GRBs); in particular, the ``baryon-loading''
problem that plagues many models of GRBs is circumvented. We present physically
motivated and numerically validated analytic expressions to describe
trans-relativistic blast waves in supernovae. We find that relativistic ejecta
are enhanced in more centrally condensed envelopes, e.g., for radiative
envelopes, when the luminosity approaches the Eddington limit. We present
convenient formulae for estimating the relativistic ejecta from a given
progenitor. We apply our analytic and numerical methods to a model of SN
1998bw, finding significantly enhanced relativistic ejecta compared to previous
studies. We propose that GRB 980425 is associated with SN 1998bw and may have
resulted from an approximately spherical explosion producing ~10^-6 M_sun of
mildly relativistic ejecta with mean Lorentz factor ~2, which then interacted
with a dense circumstellar wind with mass loss rate ~few x 10^-4 M_sun/yr. A
highly asymmetric explosion is not required. An extreme model of ``hypernova''
explosions in massive stars is able to account for the energetics and
relativistic ejecta velocities required by many of the observed cosmological
GRBs. We present simplified models of explosions resulting from
accretion-induced collapse of white dwarfs and phase transitions of neutron
stars. While we find increased energies in relativistic ejecta compared to
previous studies, these explosions are unlikely to be observed at cosmological
distances with current detectors. (abridged)
|
[{'version': 'v1', 'created': 'Fri, 1 Dec 2000 00:43:33 GMT'}
{'version': 'v2', 'created': 'Sat, 13 Jan 2001 00:51:39 GMT'}]
|
2009-10-31
|
[array(['Tan', 'Jonathan C.', ''], dtype=object)
array(['Matzner', 'Christopher D.', ''], dtype=object)
array(['McKee', 'Christopher F.', ''], dtype=object)]
|
17,580 |
astro-ph/0401130
|
Zoltan Haiman
|
Andrei Mesinger, Zoltan Haiman (Columbia University), Renyue Cen
(Princeton University)
|
Probing the Reionization History Using the Spectra of High-Redshift
Sources
|
modified version, accepted to appear in ApJ, vol. 613, 20 September
2004
|
Astrophys.J. 613 (2004) 23-35
|
10.1086/422898
| null |
astro-ph
| null |
We quantify and discuss the footprints of neutral hydrogen in the
intergalactic medium (IGM) on the spectra of high-redshift (z ~ 6) sources,
using mock spectra generated from hydrodynamical simulations of the IGM. We
show that it should be possible to extract relevant parameters, including the
mean neutral fraction in the IGM, and the radius of the local cosmological
Stromgren region, from the flux distribution in the observed spectra of distant
sources. We focus on quasars, but a similar analysis is applicable to galaxies
and gamma ray burst (GRB) afterglows. We explicitly include uncertainties in
the spectral shape of the assumed source template near the Lyman alpha line.
Our results suggest that a mean neutral hydrogen fraction, x(HI) of unity can
be statistically distinguished from x(HI)<0.01, by combining the spectra of
tens of bright (M = -27) quasars. Alternatively, the same distinction can be
achieved using the spectra of several hundred sources that are ~100 times
fainter. Furthermore, if the radius of the Stromgren sphere can be
independently constrained to within ~10 percent, this distinction can be
achieved using a single source. The information derived from such spectra will
help in settling the current debate as to what extent the universe was
reionized at redshifts near z=6.
|
[{'version': 'v1', 'created': 'Thu, 8 Jan 2004 21:07:16 GMT'}
{'version': 'v2', 'created': 'Mon, 7 Jun 2004 20:59:59 GMT'}]
|
2009-11-10
|
[array(['Mesinger', 'Andrei', '', 'Columbia University'], dtype=object)
array(['Haiman', 'Zoltan', '', 'Columbia University'], dtype=object)
array(['Cen', 'Renyue', '', 'Princeton University'], dtype=object)]
|
17,581 |
1512.03029
|
Francesco Saverio Patacchini
|
J. A. Carrillo, Y. Huang, F. S. Patacchini and G. Wolansky
|
Numerical Study of a Particle Method for Gradient Flows
|
27 pages, 21 figures
| null |
10.3934/krm.2017025
| null |
math.AP math.NA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the numerical behaviour of a particle method for gradient flows
involving linear and nonlinear diffusion. This method relies on the
discretisation of the energy via non-overlapping balls centred at the
particles. The resulting scheme preserves the gradient flow structure at the
particle level, and enables us to obtain a gradient descent formulation after
time discretisation. We give several simulations to illustrate the validity of
this method, as well as a detailed study of one-dimensional
aggregation-diffusion equations.
|
[{'version': 'v1', 'created': 'Wed, 9 Dec 2015 20:19:28 GMT'}
{'version': 'v2', 'created': 'Mon, 6 Jun 2016 06:16:50 GMT'}
{'version': 'v3', 'created': 'Tue, 6 Dec 2016 17:06:39 GMT'}]
|
2016-12-07
|
[array(['Carrillo', 'J. A.', ''], dtype=object)
array(['Huang', 'Y.', ''], dtype=object)
array(['Patacchini', 'F. S.', ''], dtype=object)
array(['Wolansky', 'G.', ''], dtype=object)]
|
17,582 |
nucl-th/0407008
|
Janusz Brzychczyk
|
Janusz Brzychczyk
|
Order parameter fluctuations in percolation: Application to nuclear
multifragmentation
|
9 pages, 12 figures, submitted to Phys. Rev. C
| null | null | null |
nucl-th
| null |
Order parameter fluctuations (the largest cluster size distribution) are
studied within a three-dimensional bond percolation model on small lattices.
Cumulant ratios measuring the fluctuations exhibit distinct features near the
percolation transition (pseudocritical point), providing a method for its
identification. The location of the critical point in the continuous limit can
be estimated without variation of the system size. This method is remarkably
insensitive to finite-size effects and may be applied even for a very small
system. The possibility of using various measurable quantities for sorting
events makes the procedure useful in studying clusterization phenomena, in
particular nuclear multifragmentation. Finite-size scaling and delta-scaling
relations are examined. The model shows inconsistency with some of the
delta-scaling expectations. The role of surface effects is evaluated by
comparing results for free and periodic boundary conditions.
|
[{'version': 'v1', 'created': 'Fri, 2 Jul 2004 17:43:55 GMT'}
{'version': 'v2', 'created': 'Sun, 31 Jul 2005 18:34:25 GMT'}]
|
2007-05-23
|
[array(['Brzychczyk', 'Janusz', ''], dtype=object)]
|
17,583 |
2009.01031
|
Haiwei Wu
|
Haiwei Wu and Jiantao Zhou and Yuanman Li
|
Deep Generative Model for Image Inpainting with Local Binary Pattern
Learning and Spatial Attention
| null | null | null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Deep learning (DL) has demonstrated its powerful capabilities in the field of
image inpainting. The DL-based image inpainting approaches can produce visually
plausible results, but often generate various unpleasant artifacts, especially
in the boundary and highly textured regions. To tackle this challenge, in this
work, we propose a new end-to-end, two-stage (coarse-to-fine) generative model
through combining a local binary pattern (LBP) learning network with an actual
inpainting network. Specifically, the first LBP learning network using U-Net
architecture is designed to accurately predict the structural information of
the missing region, which subsequently guides the second image inpainting
network for better filling the missing pixels. Furthermore, an improved spatial
attention mechanism is integrated in the image inpainting network, by
considering the consistency not only between the known region with the
generated one, but also within the generated region itself. Extensive
experiments on public datasets including CelebA-HQ, Places and Paris StreetView
demonstrate that our model generates better inpainting results than the
state-of-the-art competing algorithms, both quantitatively and qualitatively.
The source code and trained models will be made available at
https://github.com/HighwayWu/ImageInpainting.
|
[{'version': 'v1', 'created': 'Wed, 2 Sep 2020 12:59:28 GMT'}]
|
2020-09-03
|
[array(['Wu', 'Haiwei', ''], dtype=object)
array(['Zhou', 'Jiantao', ''], dtype=object)
array(['Li', 'Yuanman', ''], dtype=object)]
|
17,584 |
quant-ph/9902059
|
Robert B. Griffiths
|
Robert B. Griffiths (Carnegie-Mellon)
|
Bohmian mechanics and consistent histories
|
Minor revision of earlier version. Latex, 10 pages, 1 figure
|
Phys.Lett. A261 (1999) 227-234
|
10.1016/S0375-9601(99)00542-3
| null |
quant-ph
| null |
The interpretations of a particular quantum gedanken experiment provided by
Bohmian mechanics and consistent histories are shown to contradict each other,
both in the absence and in the presence of a measuring device. The consistent
history result seems closer to standard quantum mechanics, and shows no
evidence of the mysterious nonlocal influences present in the Bohmian
description.
|
[{'version': 'v1', 'created': 'Wed, 17 Feb 1999 14:03:04 GMT'}
{'version': 'v2', 'created': 'Wed, 28 Apr 1999 21:06:29 GMT'}]
|
2009-10-31
|
[array(['Griffiths', 'Robert B.', '', 'Carnegie-Mellon'], dtype=object)]
|
17,585 |
2010.01260
|
Hong-Li Zeng
|
Hong-Li Zeng, Vito Dichio, Edwin Rodr\'iguez Horta, Kaisa Thorell, and
Erik Aurell
|
Global analysis of more than 50,000 SARS-Cov-2 genomes reveals epistasis
between 8 viral genes
|
22 pages, 11 pages
| null |
10.1073/pnas.2012331117
| null |
q-bio.QM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Genome-wide epistasis analysis is a powerful tool to infer gene interactions,
which can guide drug and vaccine development and lead to a deeper understanding
of microbial pathogenesis. We have considered all complete SARS-CoV-2 genomes
deposited in the GISAID repository until \textbf{four} different cut-off dates,
and used Direct Coupling Analysis together with an assumption of Quasi-Linkage
Equilibrium to infer epistatic contributions to fitness from polymorphic loci.
We find \textbf{eight} interactions, of which three between pairs where one
locus lies in gene ORF3a, both loci holding non-synonymous mutations. We also
find interactions between two loci in gene nsp13, both holding non-synonymous
mutations, and four interactions involving one locus holding a synonymous
mutation. Altogether we infer interactions between loci in viral genes ORF3a
and nsp2, nsp12 and nsp6, between ORF8 and nsp4, and between loci in genes
nsp2, nsp13 and nsp14. The paper opens the prospect to use prominent
epistatically linked pairs as a starting point to search for combinatorial
weaknesses of recombinant viral pathogens.
|
[{'version': 'v1', 'created': 'Sat, 3 Oct 2020 02:19:29 GMT'}]
|
2022-05-18
|
[array(['Zeng', 'Hong-Li', ''], dtype=object)
array(['Dichio', 'Vito', ''], dtype=object)
array(['Horta', 'Edwin Rodríguez', ''], dtype=object)
array(['Thorell', 'Kaisa', ''], dtype=object)
array(['Aurell', 'Erik', ''], dtype=object)]
|
17,586 |
1810.09192
|
Torben Martinussen
|
Torben Martinussen, Stijn Vansteelandt and Per Kragh Andersen
|
Subtleties in the interpretation of hazard ratios
| null | null | null | null |
math.ST stat.TH
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The hazard ratio is one of the most commonly reported measures of treatment
effect in randomised trials, yet the source of much misinterpretation. This
point was made clear by (Hernan, 2010) in commentary, which emphasised that the
hazard ratio contrasts populations of treated and untreated individuals who
survived a given period of time, populations that will typically fail to be
comparable - even in a randomised trial - as a result of different pressures or
intensities acting on both populations. The commentary has been very
influential, but also a source of surprise and confusion. In this note, we aim
to provide more insight into the subtle interpretation of hazard ratios and
differences, by investigating in particular what can be learned about treatment
effect from the hazard ratio becoming 1 after a certain period of time.
Throughout, we will focus on the analysis of randomised experiments, but our
results have immediate implications for the interpretation of hazard ratios in
observational studies.
|
[{'version': 'v1', 'created': 'Mon, 22 Oct 2018 11:57:16 GMT'}]
|
2018-10-23
|
[array(['Martinussen', 'Torben', ''], dtype=object)
array(['Vansteelandt', 'Stijn', ''], dtype=object)
array(['Andersen', 'Per Kragh', ''], dtype=object)]
|
17,587 |
1912.10787
|
Austin Dill
|
Austin Dill, Songwei Ge, Eunsu Kang, Chun-Liang Li, Barnabas Poczos
|
Learned Interpolation for 3D Generation
|
Creativity and Design Workshop at NeurIPS 2019
| null | null | null |
cs.GR cs.LG stat.ML
|
http://creativecommons.org/licenses/by/4.0/
|
In order to generate novel 3D shapes with machine learning, one must allow
for interpolation. The typical approach for incorporating this creative process
is to interpolate in a learned latent space so as to avoid the problem of
generating unrealistic instances by exploiting the model's learned structure.
The process of the interpolation is supposed to form a semantically smooth
morphing. While this approach is sound for synthesizing realistic media such as
lifelike portraits or new designs for everyday objects, it subjectively fails
to directly model the unexpected, unrealistic, or creative. In this work, we
present a method for learning how to interpolate point clouds. By encoding
prior knowledge about real-world objects, the intermediate forms are both
realistic and unlike any existing forms. We show not only how this method can
be used to generate "creative" point clouds, but how the method can also be
leveraged to generate 3D models suitable for sculpture.
|
[{'version': 'v1', 'created': 'Sun, 8 Dec 2019 23:44:33 GMT'}
{'version': 'v2', 'created': 'Fri, 24 Jan 2020 20:12:32 GMT'}]
|
2020-01-28
|
[array(['Dill', 'Austin', ''], dtype=object)
array(['Ge', 'Songwei', ''], dtype=object)
array(['Kang', 'Eunsu', ''], dtype=object)
array(['Li', 'Chun-Liang', ''], dtype=object)
array(['Poczos', 'Barnabas', ''], dtype=object)]
|
17,588 |
2109.06865
|
Xing-Yu Yang
|
Rong-Gen Cai, Xing-Yu Yang, Long Zhao
|
Energy spectrum of gravitational waves
|
5 pages, 1 figure
| null | null | null |
astro-ph.CO gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The energy spectrum of gravitational waves (GWs), which depicts the energy of
GWs per unit volume of space per logarithmic frequency interval normalized to
the critical density of the Universe, is a widely used way for quantifying the
sensitivity of GW detectors and the strength of GWs, since it has the advantage
of having a clear physical meaning. It was found that the energy spectrum of
GWs depends on the gauge when the GWs beyond the linear order perturbations are
considered. We show that this gauge dependence issue originates from the
inappropriate description for the energy of GWs. With the proper description
for the energy of GWs, we give a well-defined energy spectrum of GWs, in which
the gauge issue disappears naturally.
|
[{'version': 'v1', 'created': 'Mon, 13 Sep 2021 02:47:10 GMT'}]
|
2021-09-15
|
[array(['Cai', 'Rong-Gen', ''], dtype=object)
array(['Yang', 'Xing-Yu', ''], dtype=object)
array(['Zhao', 'Long', ''], dtype=object)]
|
17,589 |
0909.1059
|
Rejmund Fanny Dr
|
M. Caamano, F. Rejmund, K.-H. Schmidt
|
Discrimination between roles of fissioning nucleus and asymmetry degree
of freedom on the even-odd structure in fission-fragment yields
| null | null | null | null |
nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Based on a wide systematics of fission-fragment distributions measured in
low-energy fission, the even-odd staggering in the fission-fragment element
yields is investigated. The well-established evolution of the global even-odd
effect with the fissioning system is found to be only a partial aspect of the
even-odd structure. Indeed, it is shown that the global even-odd effect is
varying systematically with the mean asymmetry of the fission-fragment
distribution, and that the general increase of the even-odd staggering with
asymmetry is depending on the fissioning system. Thus, the dependency of the
even-odd effect with the fissioning system is accredited in part to the
asymmetry evolution of the charge distribution, and not solely related to the
dissipated energy as it has been done earlier. This interpretation is strongly
supported by data measured in inverse kinematics, which cover the complete
charge distribution and include precise yields at symmetry. The relevance of
the order parameter to describe the even-odd effect in fission-fragment yields
as a general property is explored.
|
[{'version': 'v1', 'created': 'Sat, 5 Sep 2009 21:34:45 GMT'}
{'version': 'v2', 'created': 'Mon, 13 Sep 2010 19:20:56 GMT'}]
|
2010-09-14
|
[array(['Caamano', 'M.', ''], dtype=object)
array(['Rejmund', 'F.', ''], dtype=object)
array(['Schmidt', 'K. -H.', ''], dtype=object)]
|
17,590 |
2107.02301
|
Alexander Greenwood
|
Alexander C. B. Greenwood, Larry T. H. Wu, Eric Y. Zhu, Brian T.
Kirby, and Li Qian
|
Machine-Learning-Derived Entanglement Witnesses
|
11 pages
|
Phys. Rev. Applied 19, 034058 (2023)
|
10.1103/PhysRevApplied.19.034058
| null |
quant-ph
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
In this work, we show a correspondence between linear support vector machines
(SVMs) and entanglement witnesses, and use this correspondence to generate
entanglement witnesses for bipartite and tripartite qubit (and qudit) target
entangled states. An SVM allows for the construction of a hyperplane that
clearly delineates between separable states and the target entangled state;
this hyperplane is a weighted sum of observables ('features') whose
coefficients are optimized during the training of the SVM. We demonstrate with
this method the ability to obtain witnesses that require only local
measurements even when the target state is a non-stabilizer state. Furthermore,
we show that SVMs are flexible enough to allow us to rank features, and to
reduce the number of features systematically while bounding the inference
error. This allows us to derive W state witnesses capable of detecting
entanglement with fewer measurement terms than the fidelity method dominant in
today's literature. The utility of this approach is demonstrated on quantum
hardware furnished through the IBM Quantum Experience.
|
[{'version': 'v1', 'created': 'Mon, 5 Jul 2021 22:28:02 GMT'}
{'version': 'v2', 'created': 'Tue, 18 Oct 2022 21:52:54 GMT'}
{'version': 'v3', 'created': 'Wed, 22 Mar 2023 13:56:56 GMT'}]
|
2023-03-23
|
[array(['Greenwood', 'Alexander C. B.', ''], dtype=object)
array(['Wu', 'Larry T. H.', ''], dtype=object)
array(['Zhu', 'Eric Y.', ''], dtype=object)
array(['Kirby', 'Brian T.', ''], dtype=object)
array(['Qian', 'Li', ''], dtype=object)]
|
17,591 |
2010.02641
|
Miguel Dominguez-Vazquez
|
Jose Carlos Diaz-Ramos, Miguel Dominguez-Vazquez, Olga Perez-Barral
|
Homogeneous CR submanifolds of complex hyperbolic spaces
|
15 pages
| null | null | null |
math.DG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We classify homogeneous CR submanifolds in complex hyperbolic spaces arising
as orbits of a subgroup of the solvable part of the Iwasawa decomposition of
the isometry group of the ambient space.
|
[{'version': 'v1', 'created': 'Tue, 6 Oct 2020 11:44:09 GMT'}]
|
2020-10-07
|
[array(['Diaz-Ramos', 'Jose Carlos', ''], dtype=object)
array(['Dominguez-Vazquez', 'Miguel', ''], dtype=object)
array(['Perez-Barral', 'Olga', ''], dtype=object)]
|
17,592 |
astro-ph/0309463
|
Timothy Donaghy
|
D. Q. Lamb, T. Q. Donaghy and C. Graziani
|
Gamma-Ray Bursts as a Laboratory for the Study of Type Ic Supernovae
|
10 pages, 5 figures, to appear in proc. "3-D Signatures in Stellar
Explosions", Austin, Texas
| null | null | null |
astro-ph
| null |
HETE-2 has confirmed the connection between GRBs and Type Ic supernovae. Thus
we now know that the progenitors of long GRBs are massive stars. HETE-2 has
also provided strong evidence that the properties of X-Ray Flashes (XRFs) and
GRBs form a continuum, and therefore that these two types of bursts are the
same phenomenon. We show that both the structured jet and the uniform jet
models can explain the observed properties of GRBs reasonably well. However, if
one tries to account for the properties of both XRFs and GRBs in a unified
picture, the uniform jet model works reasonably well while the structured jet
model fails utterly. The uniform jet model of XRFs and GRBs implies that most
GRBs have very small jet opening angles (~ half a degree). This suggests that
magnetic fields play a crucial role in GRB jets. The model also implies that
the energy radiated in gamma rays is ~100 times smaller than has been thought.
Most importantly, the model implies that there are ~10^4 -10^5 more bursts with
very small jet opening angles for every such burst we see. Thus the rate of
GRBs could be comparable to the rate of Type Ic core collapse supernovae.
Accurate, rapid localizations of many XRFs, leading to identification of their
X-ray and optical afterglows and the determination of their redshifts, will be
required in order to confirm or rule out these profound implications. HETE-2 is
ideally suited to do this (it has localized 16 XRFs in ~2 years), whereas Swift
is not. The unique insights into the structure of GRB jets, the rate of GRBs,
and the nature of Type Ic supernovae that XRFs may provide therefore constitute
a compelling scientific case for continuing HETE-2 during the Swift mission.
|
[{'version': 'v1', 'created': 'Tue, 16 Sep 2003 20:51:20 GMT'}]
|
2007-05-23
|
[array(['Lamb', 'D. Q.', ''], dtype=object)
array(['Donaghy', 'T. Q.', ''], dtype=object)
array(['Graziani', 'C.', ''], dtype=object)]
|
17,593 |
physics/0612108
|
Yamir Moreno Vega
|
J. Gomez-Gardenes, M. Campillo, L. M. Floria, Y. Moreno
|
Dynamical Organization of Cooperation in Complex Topologies
|
4 pages and 4 figures. Final version as published in Physical Review
Letters
|
Physical Review Letters 98, 108103 (2007)
|
10.1103/PhysRevLett.98.108103
| null |
physics.soc-ph
| null |
In this Letter, we study how cooperation is organized in complex topologies
by analyzing the evolutionary (replicator) dynamics of the Prisoner's Dilemma,
a two-players game with two available strategies, defection and cooperation,
whose payoff matrix favors defection. We show that, asymptotically, the
population is partitioned into three subsets: individuals that always cooperate
({\em pure cooperators}), always defect ({\em pure defectors}) and those that
intermittently change their strategy. In fact the size of the latter set is the
biggest for a wide range of the "stimulus to defect" parameter. While in
homogeneous random graphs pure cooperators are grouped into several clusters,
in heterogeneous scale-free (SF) networks they always form a single cluster
containing the most connected individuals (hubs). Our results give further
insights into why cooperation in SF networks is favored.
|
[{'version': 'v1', 'created': 'Tue, 12 Dec 2006 17:20:06 GMT'}
{'version': 'v2', 'created': 'Mon, 5 Feb 2007 15:04:29 GMT'}
{'version': 'v3', 'created': 'Thu, 8 Mar 2007 14:55:07 GMT'}]
|
2007-05-23
|
[array(['Gomez-Gardenes', 'J.', ''], dtype=object)
array(['Campillo', 'M.', ''], dtype=object)
array(['Floria', 'L. M.', ''], dtype=object)
array(['Moreno', 'Y.', ''], dtype=object)]
|
17,594 |
2004.05191
|
David Ayuso
|
David Ayuso, Andres Ordonez, Piero Decleva, Misha Ivanov and Olga
Smirnova
|
Polarization of chirality
| null | null | null | null |
physics.optics
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It has been long recognized that the spatial polarization of the electronic
clouds in molecules, and the spatial arrangements of atoms into chiral
molecular structures, play crucial roles in physics, chemistry and biology.
However, these two fundamental concepts - chirality and polarization - have
remained unrelated so far. This work connects them by introducing and exploring
the concept of polarization of chirality. We show that, like charge, chirality,
or handedness, can be polarized, and that such polarization leads to
fundamental consequences, demonstrated here using light. First, we analyze how
chirality dipoles and higher-order chirality multipoles manifest in
experimental observables. Next, we show how to create chirality-polarized
optical fields of alternating handedness in space. Despite being achiral, these
racemic space-time light structures interact differently with chiral matter of
opposite handedness, and the chirality dipole of light controls and quantifies
the strength of the enantio-sensitive response. Using nonlinear interactions,
we can make a medium of randomly oriented chiral molecules emit light to the
left, or to the right, depending on the molecular handedness and on the
chirality dipole of light. The chiral dichroism in emission direction reaches
its highest possible value of 200%. Our work opens the field of chirality
polarization shaping of light and new opportunities for efficient chiral
discrimination and control of chiral and chirality-polarized light and matter
on ultrafast time scales.
|
[{'version': 'v1', 'created': 'Fri, 10 Apr 2020 18:12:13 GMT'}]
|
2020-04-14
|
[array(['Ayuso', 'David', ''], dtype=object)
array(['Ordonez', 'Andres', ''], dtype=object)
array(['Decleva', 'Piero', ''], dtype=object)
array(['Ivanov', 'Misha', ''], dtype=object)
array(['Smirnova', 'Olga', ''], dtype=object)]
|
17,595 |
0903.3561
|
Georgy Sharygin I.
|
G.I.Sharygin
|
Holonomy, twisting cochains and characteristic classes
|
74 pages, comments are welcome (some misprints and minor mistakes are
corrected in the newer version)
| null | null |
preprint ITEP-TH-32/08
|
math.KT math.AT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The primary interest of this paper is to discuss the role of twisting
cochains in the theory of characteristic classes. We begin with the homological
description of monodromy map, associated with a connection on a trivial bundle
over a 1-connected manifold. We regard it as a homomorphism from the algebra of
differential forms on the structure group to the algebra of differential forms
on the based loopspace of the base, represented by the (reduced) bar-complex of
differential forms on it. Next we discuss the notion of "twisting cochains", or
more generally "twisting maps", their equivalence relation and give various
examples. We show that every twisting map gives rise to a map from the
coalgebra to the bar-resolution of the algebra. Further we show that in the
case of genuine twisting cochains one can obtain a map from the differential
forms on the gauge bundle, associated with the given principal one, to the
reduced Hochschild complex of the algebra, of differential forms of the base.
Then we discuss a concrete example of a twisting cochain that is defined on the
polynomial de Rham forms on an algebraic group and takes values in Cech complex
of the base. We show how it can be used to obtain explicit formulas for the
Chern classes. We also discuss few modifications of this construction. In the
last section we discuss the construction, similar to the one, used by Getzler,
Jones and Petrack in their 1991 paper. We show that the map we call
"Getzler-Jones-Petrack's map" is homotopy-equivalent to the map that one
obtains from a twisting cochain. This enables us to find a generalization of
the Bismut's class, which we regard as an image of a suitable element in the
differential forms on the group under the Getzler-Jones-Petrack's map.
|
[{'version': 'v1', 'created': 'Fri, 20 Mar 2009 16:17:00 GMT'}
{'version': 'v2', 'created': 'Fri, 22 Jan 2010 20:24:26 GMT'}]
|
2010-01-22
|
[array(['Sharygin', 'G. I.', ''], dtype=object)]
|
17,596 |
2003.03847
|
P\'eter Kov\'acs
|
P\'eter Kov\'acs, Andrea M. Fekete
|
Nonlinear least-squares spline fitting with variable knots
|
Demonstrations and simulation data are available online at
https://numanal.inf.elte.hu/~kovi/docs/pubs/
|
P. Kovacs, A. M. Fekete, Nonlinear least-squares spline fitting
with variable knots, Applied Mathematics and Computation, vol. 354, pp. 490 -
501, 2019
|
10.1016/j.amc.2019.02.051
| null |
eess.SP cs.NA math.NA math.OC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we present a nonlinear least-squares fitting algorithm using
B-splines with free knots. Since its performance strongly depends on the
initial estimation of the free parameters (i.e. the knots), we also propose a
fast and efficient knot-prediction algorithm that utilizes numerical properties
of first-order B-splines. Using $\ell_p\;(p=1,2,\infty)$ norm solutions, we
also provide three different strategies for properly selecting the free knots.
Our initial predictions are then iteratively refined by means of a
gradient-based variable projection optimization. Our method is general in
nature and can be used to estimate the optimal number of knots in cases in
which no a-priori information is available. To evaluate the performance of our
method, we approximated a one-dimensional discrete time series and conducted an
extensive comparative study using both synthetic and real-world data. We chose
the problem of electrocardiogram (ECG) signal compression as a real-world case
study. Our experiments on the well-known PhysioNet MIT-BIH Arrhythmia database
show that the proposed method outperforms other knot-prediction techniques in
terms of accuracy while requiring much lower computational complexity.
|
[{'version': 'v1', 'created': 'Sun, 8 Mar 2020 21:17:19 GMT'}
{'version': 'v2', 'created': 'Thu, 12 Mar 2020 13:21:32 GMT'}]
|
2020-03-13
|
[array(['Kovács', 'Péter', ''], dtype=object)
array(['Fekete', 'Andrea M.', ''], dtype=object)]
|
17,597 |
2209.04210
|
Aurelia Leclerc
|
A. Leclerc, C. Babusiaux, F. Arenou, F. van Leeuwen, M. Bonnefoy, X.
Delfosse, T. Forveille, J.-B. Le Bouquin, L. Rodet
|
Combining Hipparcos and Gaia data for the study of binaries: the BINARYS
tool
| null |
A&A 672, A82 (2023)
|
10.1051/0004-6361/202244144
| null |
astro-ph.SR astro-ph.EP astro-ph.IM
|
http://creativecommons.org/licenses/by/4.0/
|
Orbital motion in binary and planetary systems is the main source of precise
stellar and planetary mass measurements, and joint analysis of data from
multiple observational methods can both lift degeneracies and improve
precision. We set out to measure the masses of individual stars in binary
systems using all the information brought by the Hipparcos and Gaia absolute
astrometric missions. We present BINARYS, a tool which uses the Hipparcos and
Gaia absolute astrometric data and combines it with relative astrometry and/or
radial velocity measurements to determine the orbit of a binary system. It
rigorously combines the Hipparcos and Gaia data (here EDR3), and it can use the
Hipparcos Transit Data as needed for binaries where Hipparcos detect
significant flux from the secondary component. It also support the case where
Gaia resolved the system, giving an astrometric solution for both components.
We determine model-independent individual masses for the first time for three
systems: the two mature binaries Gl~494 ($M_1=0.584 \pm 0.003 M_{\odot}$ and
$M_2=87 \pm 1 M_{\textrm{Jup}}$) and HIP~88745 ($M_1=0.96 \pm 0.02 M_{\odot}$
and $M_2= 0.60^{+ 0.02 }_{- 0.01 } M_{\odot}$), and the younger AB Dor member
GJ~2060 ($M_1=0.60 ^{+ 0.06}_{- 0.05} M_{\odot}$ and $M_2=0.45 ^{+ 0.06}_{-
0.05}M_{\odot}$). The latter provides a rare test of evolutionary model
predictions at young ages in the low stellar-mass range and sets a lower age
limit of 100~Myr for the moving group.
|
[{'version': 'v1', 'created': 'Fri, 9 Sep 2022 09:57:53 GMT'}]
|
2023-04-05
|
[array(['Leclerc', 'A.', ''], dtype=object)
array(['Babusiaux', 'C.', ''], dtype=object)
array(['Arenou', 'F.', ''], dtype=object)
array(['van Leeuwen', 'F.', ''], dtype=object)
array(['Bonnefoy', 'M.', ''], dtype=object)
array(['Delfosse', 'X.', ''], dtype=object)
array(['Forveille', 'T.', ''], dtype=object)
array(['Bouquin', 'J. -B. Le', ''], dtype=object)
array(['Rodet', 'L.', ''], dtype=object)]
|
17,598 |
2302.10234
|
Davor Palle
|
Davor Palle
|
W boson mass anomaly and noncontractibility of the physical space
|
v2: few sentences and one reference added
| null | null | null |
physics.gen-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The CDF II detector at the Tevatron collider reported significant tension
between the measurement of the W boson mass and the Standard Model prediction,
assuming that 125 GeV scalar discovered at the LHC is the Higgs boson. We
calculate one loop corrections to the W boson mass within the theory of
noncontractible space without the Higgs boson. It turns out that our theory
provides better agreement with the CDF II detector result than the Standard
Model.
|
[{'version': 'v1', 'created': 'Sat, 7 Jan 2023 20:47:59 GMT'}
{'version': 'v2', 'created': 'Mon, 27 Mar 2023 11:23:33 GMT'}]
|
2023-03-28
|
[array(['Palle', 'Davor', ''], dtype=object)]
|
17,599 |
2005.10635
|
Randall Balestriero
|
Randall Balestriero
|
SymJAX: symbolic CPU/GPU/TPU programming
| null | null | null | null |
cs.MS cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
SymJAX is a symbolic programming version of JAX simplifying graph
input/output/updates and providing additional functionalities for general
machine learning and deep learning applications. From an user perspective
SymJAX provides a la Theano experience with fast graph optimization/compilation
and broad hardware support, along with Lasagne-like deep learning
functionalities.
|
[{'version': 'v1', 'created': 'Thu, 21 May 2020 13:37:25 GMT'}]
|
2020-05-22
|
[array(['Balestriero', 'Randall', ''], dtype=object)]
|
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