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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
18,100 |
astro-ph/0001448
|
Wolfgang Vieser
|
Wolfgang Vieser and Gerhard Hensler
|
Evaporation and Condensation Processes of Giant Molecular Clouds in a
Hot Plasma
|
to appear in: 1999, Proc. "Astrophysical Dynamics", eds. D. Berry et
al., Astroph. Sp. Sci., in press
|
Astrophys.Space Sci. 272 (2000) 189-196
|
10.1023/A:1002684126855
| null |
astro-ph
| null |
2d hydrodynamical simulations are performed to examine the evaporation and
condensation processes of giant molecular clouds in the hot phase of the
interstellar medium. The evolution of cold and dense clouds is calculated in
the subsonic stream of a hot tenuous plasma. Our code includes self-gravity,
heating and cooling processes and heat conduction by electrons. Significant
differences occur between simulations with and without heat conduction.
|
[{'version': 'v1', 'created': 'Wed, 26 Jan 2000 09:11:21 GMT'}]
|
2009-10-31
|
[array(['Vieser', 'Wolfgang', ''], dtype=object)
array(['Hensler', 'Gerhard', ''], dtype=object)]
|
18,101 |
math-ph/0011027
|
George Leontaris
|
E.G. Floratos, G.K. Leontaris
|
World volume Supermembrane Instantons in the light-cone frame
|
Talk, Ioannina 98, Symmetries in intermediate and high energy physics
| null | null | null |
math-ph math.MP
| null |
In this review we present the octonionic duality for membranes. We start with
a discussion on the relation of the Yang Mills theories and the supermembrane
Hamiltonian in the light-cone gauge. We further derive the self-duality
equations for the membranes and discuss the integrability of the system in 7
and 3 dimensions. Finally, we present classical Euclidean time solutions of
these equations and examine the supersymmetries left intact by the self-duality
equations.
|
[{'version': 'v1', 'created': 'Thu, 16 Nov 2000 16:13:17 GMT'}]
|
2007-05-23
|
[array(['Floratos', 'E. G.', ''], dtype=object)
array(['Leontaris', 'G. K.', ''], dtype=object)]
|
18,102 |
cond-mat/9910428
|
J. S. Sa' Martins
|
J.S. Sa' Martins
|
Simulated Coevolution in a Mutating Ecology
|
4 pages, 3 figures, minor revision in text and 2 added references
|
Phys. Rev. E 61, R2212 (2000)
|
10.1103/PhysRevE.61.R2212
| null |
cond-mat.stat-mech q-bio
| null |
The bit-string Penna Model is used to simulate the competition between an
asexual parthenogenetic and a sexual population sharing the same environment. A
new-born of either population can mutate and become a part of the other with
some probability. In a stable environment the sexual population soon dies out.
When an infestation by fastly mutating genetically coupled parasites is
introduced however, sexual reproduction prevails, as predicted by the so-called
Red Queen hypothesis for the evolution of sex.
|
[{'version': 'v1', 'created': 'Tue, 26 Oct 1999 17:55:40 GMT'}
{'version': 'v2', 'created': 'Wed, 8 Mar 2000 21:13:08 GMT'}]
|
2009-10-31
|
[array(['Martins', "J. S. Sa'", ''], dtype=object)]
|
18,103 |
1505.05937
|
Shigeru Hanba
|
Shigeru Hanba
|
Controllability to the origin implies state-feedback stabilizability for
discrete-time nonlinear systems
|
This work was supported by the Japan Society for the Promotion of
Science under Grant-in-Aid for Scientific Research (C) 23560535. This
document is the accepted version of the manuscript published in Automatica.
Copyright 2018. This manuscript version is made available under the
CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
|
Automatica, Vol. 75, pp. 154-157, 2017
|
10.1016/j.automatica.2016.09.046
| null |
math.OC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The problem of state-feedback stabilizability of discrete-time nonlinear
systems has been considered in this note. Two assertions have been proved.
First, if the system is $N$-step controllable to the origin, then there is a
state feedback control law for which the trajectory of the closed-loop system
converges to the origin in $N$ steps. Second, if the system is asymptotically
controllable to the origin and satisfies the controllability rank condition at
the origin, then there is a state feedback control law for which the trajectory
of the closed-loop system converges to the origin in finite steps.
|
[{'version': 'v1', 'created': 'Fri, 22 May 2015 02:54:39 GMT'}
{'version': 'v2', 'created': 'Wed, 18 Apr 2018 06:00:50 GMT'}]
|
2018-04-19
|
[array(['Hanba', 'Shigeru', ''], dtype=object)]
|
18,104 |
1411.4876
|
Stella Riad
|
Johannes Bergstrom and Stella Riad
|
Bayesian Model comparison of Higgs couplings
|
24 pages, 4 figures
|
Phys. Rev. D 91, 075008 (2015)
|
10.1103/PhysRevD.91.075008
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the possibility of contributions from physics beyond the
Standard Model (SM) to the Higgs couplings, in the light of the LHC data. The
work is performed within an interim framework where the magnitude of the Higgs
production and decay rates are rescaled though Higgs coupling scale factors. We
perform Bayesian parameter inference on these scale factors, concluding that
there is good compatibility with the SM. Furthermore, we carry out Bayesian
model comparison on all models where any combination of scale factors can
differ from their SM values and find that typically models with fewer free
couplings are strongly favoured. We consider the evidence that each coupling
individually equals the SM value, making the minimal assumptions on the other
couplings. Finally, we make a comparison of the SM against a single "not-SM"
model, and find that there is moderate to strong evidence for the SM.
|
[{'version': 'v1', 'created': 'Tue, 18 Nov 2014 15:36:16 GMT'}
{'version': 'v2', 'created': 'Thu, 1 Oct 2015 10:07:12 GMT'}]
|
2015-10-02
|
[array(['Bergstrom', 'Johannes', ''], dtype=object)
array(['Riad', 'Stella', ''], dtype=object)]
|
18,105 |
2205.12947
|
Matthew Habermann
|
Matthew Habermann
|
A note on homological Berglund-H\"ubsch-Henningson mirror symmetry for
curve singularities
|
35 pages, 8 figures. Comments welcome. V2 minor updates
| null | null | null |
math.SG math.AG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this note, we establish homological Berglund--H\"ubsch mirror symmetry for
curve singularities where the A-model incorporates equivariance, otherwise
known as homological Berglund-H\"ubsch-Henningson mirror symmetry. More
precisely, we prove a conjecture of Futaki and Ueda in arXiv:1004.0078 which
posits that the equivariance in the A-model can be incorporated by pulling back
the superpotential to the total space of the corresponding crepant resolution.
Our approach is predicated on the fact that the Morsifications used in
arXiv:1903.01351 are equivariant with respect to the group actions appearing on
the A-side of the conjecture. Along the way, we show that the category of
matrix factorisations of the mirror has a tilting object whose length is the
dimension of the state space of the FJRW A--model, which might also be of
independent interest.
|
[{'version': 'v1', 'created': 'Wed, 25 May 2022 17:53:24 GMT'}
{'version': 'v2', 'created': 'Mon, 28 Nov 2022 18:18:09 GMT'}]
|
2022-11-29
|
[array(['Habermann', 'Matthew', ''], dtype=object)]
|
18,106 |
2211.05668
|
Haifeng Wang
|
Hai-Feng Wang, \v{Z}ofia Chrob\'akov\'a, Mart\'in L\'opez-Corredoira,
Francesco Sylos Labini
|
Mapping the Milky Way Disk with Gaia DR3: 3D extended kinematic maps and
rotation curve to $\approx 30$ kpc
|
14 pages, 10 figures, 1 table. Accepted for publication in The
Astrophysical Journal
| null |
10.3847/1538-4357/aca27c
| null |
astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We apply a statistical deconvolution of the parallax errors based on Lucy's
inversion method (LIM) to the Gaia-DR3 sources to measure their three
dimensional velocity components in the range of Galactocentric distances $R$
between 8 kpc and 30 kpc with their corresponding errors and root mean square
values. We find results that are consistent with those obtained by applying LIM
to the Gaia-DR2 sources, and we conclude that the method gives convergent and
more accurate results by improving the statistics of the data-set and lowering
observational errors. The kinematic maps reconstructed with LIM up to $R
\approx 30$ kpc show that the Milky Way is characterized by asymmetrical
motions with significant gradients in all velocity components. Furthermore, we
determine the Galaxy rotation curve $V_C(R)$ up to $\approx 27.5$ kpc with the
cylindrical Jeans equation assuming an axisymmetric gravitational potential. We
find that $V_C(R)$ is significantly declining up to the largest radius
investigated. Finally, we also measure $V_C(R)$ at different vertical heights,
showing that, for $R <15$ kpc, there is a marked dependence on $Z$, whereas at
larger $R$ the dependence on $Z$ is negligible.
|
[{'version': 'v1', 'created': 'Thu, 10 Nov 2022 16:05:57 GMT'}
{'version': 'v2', 'created': 'Wed, 7 Dec 2022 08:15:54 GMT'}]
|
2023-01-04
|
[array(['Wang', 'Hai-Feng', ''], dtype=object)
array(['Chrobáková', 'Žofia', ''], dtype=object)
array(['López-Corredoira', 'Martín', ''], dtype=object)
array(['Labini', 'Francesco Sylos', ''], dtype=object)]
|
18,107 |
1707.03809
|
Alexander Magazinov
|
Alexander Magazinov
|
A proof of a conjecture by Haviv, Lyubashevsky and Regev on the second
moment of a lattice Voronoi cell
|
v.2: final version, accepted in Adv.Geom
| null | null | null |
math.MG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this short note we prove a sharp lower bound for the second moment of a
lattice Voronoi cell in terms of the respective covering radius. This gives an
affirmative answer to a conjecture by Haviv, Lyubashevsky and Regev. We also
characterize those lattice Voronoi cells for which this lower bound is
attained.
|
[{'version': 'v1', 'created': 'Wed, 12 Jul 2017 17:32:05 GMT'}
{'version': 'v2', 'created': 'Sat, 14 Apr 2018 20:27:37 GMT'}]
|
2018-04-17
|
[array(['Magazinov', 'Alexander', ''], dtype=object)]
|
18,108 |
1804.01168
|
Octavio Mendoza Hernandez
|
Eduardo Marcos, Octavio Mendoza and Corina S\'aenz
|
Cokernels of the Cartan Matrix and Stratifying Systems
| null | null | null | null |
math.RT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the cokernel of the application given by the Cartan Matrix
$C_\Lambda$ of a finite dimensional $k$-algebra $\Lambda.$ This produces a
finitely generated abelian group, the Cartan group $G_\Lambda,$ which is
invariant under derived equivalences. We are interested in the case when
$G_\Lambda$ is finite. For a standardly stratified algebra, it is shown that
this group is always finite and some interesting connections with the standard
modules are found. As a consequence, it is got that $G_\Lambda$ can be seen as
a measure of how far is a standardly stratified algebra $\Lambda$ to be
quasi-hereditary. Finally, it is also shown that any finite abelian group can
be realized as the Cartan group of some standardly stratified algebra.
|
[{'version': 'v1', 'created': 'Tue, 3 Apr 2018 20:58:47 GMT'}]
|
2018-04-05
|
[array(['Marcos', 'Eduardo', ''], dtype=object)
array(['Mendoza', 'Octavio', ''], dtype=object)
array(['Sáenz', 'Corina', ''], dtype=object)]
|
18,109 |
astro-ph/0205184
|
Didier Barret
|
Didier Barret (CESR, Toulouse) and Jean-Francois Olive (CESR,
Toulouse)
|
A peculiar spectral state transition of 4U1705--44: when an Atoll looks
like a Z
|
23 pages, 11 figures, 2 tables, to appear in the Astrophysical
Journal
|
Astrophys.J. 576 (2002) 391-401
|
10.1086/341626
| null |
astro-ph
| null |
We report on a clear spectral state transition of the neutron star low-mass
X-ray binary 4U1705-44 observed by the Rossi X-ray Timing Explorer. In the
X-ray color-color diagram (CCD), the source, classified as an Atoll, samples
the upper parts of a Z, starting from and returning to the left bottom of the
Z. We follow the path of 4U1705-44 on its CCD, model its broad band X-ray/hard
X-ray spectrum, and compute the Fourier power density spectrum of its X-ray
variability. The spectral transitions of 4U1705-44 are shown to be primarily
associated with changes in the temperature of the Comptonizing electrons. In
the hard state (top branch of the Z), the source evolves from left to right on
the CCD, while its luminosity smoothly increases.
Our observations can be interpreted in the framework of a model made of a
truncated accretion disk of varying inner radius and an inner flow merging
smoothly with the neutron star boundary layer. The spectral evolution could be
driven by changes in the truncation radius of the disk; e.g. the soft to hard
transition could be caused by the disk moving outwards. If this model is
correct, then our data show that the disk truncation radius is not set by the
instantaneous mass accretion rate, as derived from the source bolometric
luminosity.
Comparing the power density spectra of 4U1705-44 and Z sources when they
occupy similar branches of the Z, we show that the most significant difference
is on the diagonal branch, on which the power density spectra of 4U1705-44
remain similar to the ones measured on the top branch of the Z (hard state).
|
[{'version': 'v1', 'created': 'Mon, 13 May 2002 15:46:18 GMT'}]
|
2009-11-07
|
[array(['Barret', 'Didier', '', 'CESR, Toulouse'], dtype=object)
array(['Olive', 'Jean-Francois', '', 'CESR,\n Toulouse'], dtype=object)]
|
18,110 |
1209.2971
|
Leslie Wade IV
|
Leslie Wade, Xavier Siemens, David L. Kaplan, Benjamin Knispel, and
Bruce Allen
|
Continuous Gravitational Waves from Isolated Galactic Neutron Stars in
the Advanced Detector Era
|
Accepted for publication by Physical Review D, 8 pages, 5 figures
|
Phys. Rev. D 86, 124011 (2012)
|
10.1103/PhysRevD.86.124011
| null |
gr-qc astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a simulated population of isolated Galactic neutron stars. The
rotational frequency of each neutron star evolves through a combination of
electromagnetic and gravitational wave emission. The magnetic field strength
dictates the dipolar emission, and the ellipticity (a measure of a neutron
star's deformation) dictates the gravitational wave emission. Through both
analytic and numerical means, we assess the detectability of the Galactic
neutron star population and bound the magnetic field strength and ellipticity
parameter space of Galactic neutron stars with or without a direct
gravitational wave detection. While our simulated population is primitive, this
work establishes a framework by which future efforts can be conducted.
|
[{'version': 'v1', 'created': 'Thu, 13 Sep 2012 17:34:58 GMT'}
{'version': 'v2', 'created': 'Thu, 15 Nov 2012 16:39:03 GMT'}
{'version': 'v3', 'created': 'Fri, 16 Nov 2012 19:46:00 GMT'}]
|
2013-10-25
|
[array(['Wade', 'Leslie', ''], dtype=object)
array(['Siemens', 'Xavier', ''], dtype=object)
array(['Kaplan', 'David L.', ''], dtype=object)
array(['Knispel', 'Benjamin', ''], dtype=object)
array(['Allen', 'Bruce', ''], dtype=object)]
|
18,111 |
nlin/0507047
|
Andrea Trombettoni
|
R. Burioni, D. Cassi, P. Sodano, A. Trombettoni, and A. Vezzani
|
Propagation of Discrete Solitons in Inhomogeneous Networks
| null |
Chaos 15, 043501 (2005)
|
10.1063/1.2049147
| null |
nlin.PS cond-mat.stat-mech
| null |
In many physical applications solitons propagate on supports whose
topological properties may induce new and interesting effects. In this paper,
we investigate the propagation of solitons on chains with a topological
inhomogeneity generated by the insertion of a finite discrete network on the
chain. For networks connected by a link to a single site of the chain, we
derive a general criterion yielding the momenta for perfect reflection and
transmission of traveling solitons and we discuss solitonic motion on chains
with topological inhomogeneities.
|
[{'version': 'v1', 'created': 'Fri, 22 Jul 2005 23:59:19 GMT'}]
|
2009-11-11
|
[array(['Burioni', 'R.', ''], dtype=object)
array(['Cassi', 'D.', ''], dtype=object)
array(['Sodano', 'P.', ''], dtype=object)
array(['Trombettoni', 'A.', ''], dtype=object)
array(['Vezzani', 'A.', ''], dtype=object)]
|
18,112 |
2101.06384
|
Erik Fredenberg
|
Erik Fredenberg, Bjorn Cederstrom, Carolina Ribbing, Mats Danielsson
|
Prism-array lenses for energy filtering in medical x-ray imaging
| null |
Proc. SPIE 6510, Medical Imaging 2007: Physics of Medical Imaging,
65100S (7 March 2007)
|
10.1117/12.713767
| null |
physics.med-ph
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
Conventional energy filters for x-ray imaging are based on absorbing
materials which attenuate low energy photons, sometimes combined with an
absorption edge, thus also discriminating towards photons of higher energies.
These filters are fairly inefficient, in particular for photons of higher
energies, and other methods for achieving a narrower bandwidth have been
proposed. Such methods include various types of monochromators, based on for
instance mosaic crystals or refractive multi-prism x-ray lenses (MPL's).
Prism-array lenses (PAL's) are similar to MPL's, but are shorter, have larger
apertures, and higher transmission. A PAL consists of a number of small prisms
arranged in columns perpendicular to the optical axis. The column height
decreases along the optical axis so that the projection of lens material is
approximately linear with a Fresnel phase-plate pattern superimposed on it. The
focusing effect is one dimensional, and the lens is chromatic. Hence, unwanted
energies can be blocked by placing a slit in the image plane of a desired
energy. We present the first experimental and theoretical results on an energy
filter based on a silicon PAL. The study includes an evaluation of the spectral
shaping properties of the filter as well as a quantification of the achievable
increase in dose efficiency compared to standard methods. Previously, PAL's
have been investigated with synchrotron radiation, but in this study a medical
imaging setup, based on a regular x-ray tube, is considered.
|
[{'version': 'v1', 'created': 'Sat, 16 Jan 2021 06:54:58 GMT'}]
|
2021-01-19
|
[array(['Fredenberg', 'Erik', ''], dtype=object)
array(['Cederstrom', 'Bjorn', ''], dtype=object)
array(['Ribbing', 'Carolina', ''], dtype=object)
array(['Danielsson', 'Mats', ''], dtype=object)]
|
18,113 |
1006.3518
|
Slaven Garaj
|
S. Garaj, W. Hubbard, A. Reina, J. Kong, D. Branton and J. A.
Golovchenko
|
Graphene: A sub-nanometer trans-electrode membrane
|
Submitted 12 April 2010 to Nature, where it is under review
|
Nature 467, 190-193 (2010)
|
10.1038/nature09379
| null |
cond-mat.mes-hall physics.bio-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Isolated, atomically thin conducting membranes of graphite, called graphene,
have recently been the subject of intense research with the hope that practical
applications in fields ranging from electronics to energy science will emerge.
Here, we show that when immersed in ionic solution, a layer of graphene takes
on new electrochemical properties that make it a trans-electrode. The
trans-electrode's properties are the consequence of the atomic scale proximity
of its two opposing liquid-solid interfaces together with graphene's well known
in-plane conductivity. We show that several trans-electrode properties are
revealed by ionic conductivity measurements on a CVD grown graphene membrane
that separates two aqueous ionic solutions. Despite this membrane being only
one to two atomic layers thick, we find it is a remarkable ionic insulator with
a very small stable conductivity that depends on the ion species in solution.
Electrical measurements on graphene membranes in which a single nanopore has
been drilled show that the membrane's effective insulating thickness is less
than one nanometer. This small effective thickness makes graphene an ideal
substrate for very high-resolution, high throughput nanopore based single
molecule detectors. Sensors based on modulation of graphene's in-plane
electronic conductivity in response to trans-electrode environments and voltage
biases will provide new insights into atomic processes at the electrode
surfaces.
|
[{'version': 'v1', 'created': 'Thu, 17 Jun 2010 16:58:36 GMT'}]
|
2010-09-17
|
[array(['Garaj', 'S.', ''], dtype=object)
array(['Hubbard', 'W.', ''], dtype=object)
array(['Reina', 'A.', ''], dtype=object)
array(['Kong', 'J.', ''], dtype=object)
array(['Branton', 'D.', ''], dtype=object)
array(['Golovchenko', 'J. A.', ''], dtype=object)]
|
18,114 |
1510.02801
|
Ryan Cooke
|
Ryan Cooke (University of California, Santa Cruz)
|
Big Bang Nucleosynthesis and the Helium Isotope Ratio
|
5 pages, 2 figures, Accepted for publication in The Astrophysical
Journal Letters
|
(2015) ApJL, 812, L12
|
10.1088/2041-8205/812/1/L12
| null |
astro-ph.CO nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The conventional approach to search for departures from the standard model of
physics during Big Bang Nucleosynthesis involves a careful, and subtle
measurement of the mass fraction of baryons consisting of helium. Recent
measurements of this quantity tentatively support new physics beyond the
standard model but, historically, this method has suffered from hidden
systematic uncertainties. In this letter, I show that a combined measurement of
the primordial deuterium abundance and the primordial helium isotope ratio has
the potential to provide a complementary and reliable probe of new physics
beyond the standard model. Using the recent determination of the primordial
deuterium abundance and assuming that the measured pre-solar 3He/4He meteoritic
abundance reflects the primordial value, a bound can be placed on the effective
number of neutrino species, Neff(BBN) = 3.01 (+0.95 -0.76, with 95 per cent
confidence). Although this value of Neff supports the standard model, it is
presently unclear if the pre-solar 3He/4He ratio reflects the primordial value.
New astrophysical measurements of the helium isotope ratio in near-pristine
environments, together with updated calculations and experimental values of
several important nuclear reactions (some of which are already being
attempted), will lead to much improved limits on possible departures from the
standard model. To this end, I describe an analysis strategy to measure the 3He
I flux emitted from nearby low metallicity H II regions. The proposed technique
can be attempted with the next generation of large telescopes, and will be
easier to realize in metal-poor H II regions with quiescent kinematics.
|
[{'version': 'v1', 'created': 'Fri, 9 Oct 2015 20:04:15 GMT'}]
|
2015-10-13
|
[array(['Cooke', 'Ryan', '', 'University of California, Santa Cruz'],
dtype=object) ]
|
18,115 |
astro-ph/9501006
|
Peter Biermann
|
Peter L. Biermann
|
The origin of cosmic rays
|
Lecture at the meeting Trends in Astroparticle Physics, Stockholm
September 1994, 8 pages, uuencoded
|
Nucl.Phys.Proc.Suppl.43:221-228,1995
|
10.1016/0920-5632(95)00478-R
|
MPIfR 616
|
astro-ph
| null |
The search for the origin of cosmic rays is a quest of almost a hundred
years. A recent theoretical proposal gives quantitative predictions, which can
be tested with data. Specifically, it has been suggested, that all cosmic rays
can be attributed to just three source sites: i) supernova explosions into the
interstellar medium, ii) supernova explosions into a stellar wind, and iii)
powerful radiogalaxies. The cosmic rays from any extragalactic source suffer
from interaction with the microwave background, leading to the
Greisen-Zatsepin-Kuzmin cutoff. While the particle energies, the spectrum and
the chemical composition of cosmic rays over the energy range from about GeV to
about 100 EeV can be interpreted in the theory, there are exciting measurements
now: New measurements show that there are cosmic ray events beyond the
Greisen-Zatsepin-Kuzmin cutoff. We discuss here possible sources, and
specifically ask whether powerful radiogalaxies are suitable candidates. The
basic concepts used here are the minimal hypothesis that the intergalactic
magnetic field is given by the galaxy distribution, and the observation that
radio galaxies also cluster like galaxies.
|
[{'version': 'v1', 'created': 'Wed, 4 Jan 1995 11:47:02 GMT'}]
|
2016-08-30
|
[array(['Biermann', 'Peter L.', ''], dtype=object)]
|
18,116 |
astro-ph/0512026
|
Mario Gliozzi
|
M. Gliozzi (1), I.E. Papadakis (2), C. Raeth (3) ((1) GMU, (2)
University of Crete, (3) MPE)
|
Correlated spectral and temporal changes in 3C 390.3: a new link between
AGN and Galactic Black Hole Binaries?
|
15 pages, 12 figures, accepted for publication in A&A
| null |
10.1051/0004-6361:20041307
| null |
astro-ph
| null |
This work presents the results from a systematic search for evidence of
temporal changes (i.e., non-stationarity) associated with spectral variations
in 3C 390.3, using data from a two-year intensive RXTE monitoring campaign of
this broad-line radio galaxy. In order to exploit the potential information
contained in a time series more efficiently, we adopt a multi-technique
approach, making use of linear and non-linear techniques. All the methods show
suggestive evidences for non-stationarity in the temporal properties of 3C
390.3 between 1999 and 2000, in the sense that the characteristic time-scale of
variability decreases as the energy spectrum of the source softens. However,
only the non-linear, "scaling index method" is able to show conclusively that
the temporal characteristics of the source do vary, although the physical
interpretation of this result is not clear at the moment. Our results indicate
that the variability properties of 3C 390.3 may vary with time, in the same way
as they do in Galactic black holes in the hard state, strengthening the analogy
between the X-ray variability properties of the two types of object. This is
the first time that such a behavior is detected in an AGN X-ray light curve.
Further work is needed in order to investigate whether this is a common
behavior in AGN, just like in the Galactic binaries, or not.
|
[{'version': 'v1', 'created': 'Thu, 1 Dec 2005 16:08:27 GMT'}
{'version': 'v2', 'created': 'Fri, 2 Dec 2005 15:30:53 GMT'}]
|
2009-11-11
|
[array(['Gliozzi', 'M.', ''], dtype=object)
array(['Papadakis', 'I. E.', ''], dtype=object)
array(['Raeth', 'C.', ''], dtype=object)]
|
18,117 |
math-ph/9911039
|
Alexander G. Ramm
|
A.G.Ramm
|
Stability estimates in inverse scattering
| null |
Acta Appl Math., 28 N1, (1992), 1-42
| null | null |
math-ph math.AP math.MP math.NA
| null |
Mathematically rigorous inversion method is developed to recover compactly
supported potentials from the fixed-energy scattering data in three dimensions.
Error estimates are given for the solution.
An algorithm for inversion of noisy discrete fixed-energy #D scattering data
is developed and its error estimates are obtained
|
[{'version': 'v1', 'created': 'Fri, 26 Nov 1999 17:55:46 GMT'}]
|
2007-05-23
|
[array(['Ramm', 'A. G.', ''], dtype=object)]
|
18,118 |
astro-ph/0606022
|
P. S. Negi
|
P. S. Negi
|
Necessary and sufficient condition for hydrostatic equilibrium in
general relativity
|
31 pages (double-spaced) revtex style, 1 figure in `ps' format
|
Int.J.Mod.Phys.D16:35-52,2007
|
10.1142/S0218271807009292
| null |
astro-ph
| null |
We present explicit examples to show that the `compatibility criterion' is
capable of providing a {\em necessary} and {\em sufficient} condition for any
regular configuration to be compatible with the state of hydrostatic
equilibrium. This conclusion is drawn on the basis of the finding that the
$M-R$ relation gives the necessary and sufficient condition for dynamical
stability of equilibrium configurations only when the compatibility criterion
for these configurations is appropriately satisfied. In this regard, we
construct an appropriate sequence composed of core-envelope models on the basis
of compatibility criterion, such that each member of this sequence satisfies
the extreme case of causality condition $v = c = 1$ at the centre. The maximum
stable value of $u \simeq 0.3389$ (which occurs for the model corresponding to
the maximum value of mass in the mass-radius relation) and the corresponding
central value of the local adiabatic index, $(\Gamma_1)_0 \simeq 2.5911$, of
this model are found fully consistent with those of the corresponding {\em
absolute} values, $u_{\rm max} \leq 0.3406$, and $(\Gamma_1)_0 \leq 2.5946$,
which impose strong constraints on these parameters of such models. In addition
to this example, we also study dynamical stability of pure adiabatic polytropic
configurations on the basis of variational method for the choice of the `trial
function', $\xi =re^{\nu/4}$, as well as the mass-central density relation,
since the compatibility criterion is appropriately satisfied for these models.
The results of this example provide additional proof in favour of the statement
regarding compatibility criterion mentioned above.
|
[{'version': 'v1', 'created': 'Thu, 1 Jun 2006 11:12:18 GMT'}]
|
2008-11-26
|
[array(['Negi', 'P. S.', ''], dtype=object)]
|
18,119 |
1911.08166
|
Yang Liu
|
Baoli Yin, Yang Liu, Hong Li, Zhimin Zhang
|
Finite element methods based on two families of second-order numerical
formulas for the fractional Cable model with smooth solutions
|
24 pages, 9 figures
| null | null | null |
math.NA cs.NA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We apply two families of novel fractional $\theta$-methods, the FBT-$\theta$
and FBN-$\theta$ methods developed by the authors in previous work, to the
fractional Cable model, in which the time direction is approximated by the
fractional $\theta$-methods, and the space direction is approximated by the
finite element method. Some positivity properties of the coefficients for both
of these methods are derived, which are crucial for the proof of the stability
estimates. We analyse the stability of the scheme and derive an optimal
convergence result with $O(\tau^2+h^{r+1})$ for smooth solutions, where $\tau$
is the time mesh size and $h$ is the spatial mesh size. Some numerical
experiments with smooth and nonsmooth solutions are conducted to confirm our
theoretical analysis. To overcome the singularity at initial value, the
starting part is added to restore the second-order convergence rate in time.
|
[{'version': 'v1', 'created': 'Tue, 19 Nov 2019 09:24:30 GMT'}
{'version': 'v2', 'created': 'Wed, 10 Jun 2020 12:24:35 GMT'}]
|
2020-06-11
|
[array(['Yin', 'Baoli', ''], dtype=object)
array(['Liu', 'Yang', ''], dtype=object)
array(['Li', 'Hong', ''], dtype=object)
array(['Zhang', 'Zhimin', ''], dtype=object)]
|
18,120 |
1812.03838
|
Gowtham Raghunath Kurri
|
Deepesh Data, Gowtham R. Kurri, Jithin Ravi, Vinod M. Prabhakaran
|
Interactive Secure Function Computation
|
30 pages. Revised based on comments from the reviewers
| null |
10.1109/TIT.2020.2980789
| null |
cs.IT math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider interactive computation of randomized functions between two users
with the following privacy requirement: the interaction should not reveal to
either user any extra information about the other user's input and output other
than what can be inferred from the user's own input and output. We also
consider the case where privacy is required against only one of the users. For
both cases, we give single-letter expressions for feasibility and optimal rates
of communication. Then we discuss the role of common randomness and interaction
in both privacy settings. We also study perfectly secure non-interactive
computation when only one of the users computes a randomized function based on
a single transmission from the other user. We characterize randomized functions
which can be perfectly securely computed in this model and obtain tight bounds
on the optimal message lengths in all the privacy settings.
|
[{'version': 'v1', 'created': 'Mon, 10 Dec 2018 14:48:26 GMT'}
{'version': 'v2', 'created': 'Sat, 28 Dec 2019 09:53:44 GMT'}
{'version': 'v3', 'created': 'Mon, 9 Mar 2020 17:53:35 GMT'}]
|
2020-08-06
|
[array(['Data', 'Deepesh', ''], dtype=object)
array(['Kurri', 'Gowtham R.', ''], dtype=object)
array(['Ravi', 'Jithin', ''], dtype=object)
array(['Prabhakaran', 'Vinod M.', ''], dtype=object)]
|
18,121 |
astro-ph/0007267
|
Armando Gil de Paz
|
A. Gil de Paz (1), J. Zamorano (1), J. Gallego (1), F. de B. Dominguez
(2) ((1) Dept.Astrofisica, UCM, (2) OTRI, UC3)
|
Mapping the star formation history of Mrk86: I. Data and models
|
21 pages, 14 figures, 2 landscape tables, accepted for publication in
Astronomy & Astrophysics Supplement Series, for higher resolution images see
ftp://cutrex.fis.ucm.es/pub/OUT/gil/PAPERS/aa00_I.ps.gz
| null |
10.1051/aas:2000355
| null |
astro-ph
| null |
We have obtained optical (BVR, [OIII]5007 and Halpha), near infrared (JHK)
imaging and long-slit optical spectroscopy for the Blue Compact Dwarf galaxy
Mrk86 (NGC2537). In this paper, the first of two, we present optical-near-
infrared colors and emission-line fluxes for the currently star-forming
regions, intemediate aged starburst and underlying stellar population. We also
describe the evolutionary synthesis models used in Paper II. The R and Halpha
luminosity distributions of the galaxy star-forming regions show maxima at
M_R=-9.5 and L_Halpha=10^37.3 erg s^-1. The underlying stellar population shows
an exponential surface brigthness profile with central value, mu_E,0=21.5 mag
arcsec^-2, and scale, alpha=0.88 kpc, both measured in the R-band image. In the
galaxy outer regions, dominated by this component, no significant color
gradients are observed. Finally, a set of evolutionary synthesis models have
been developed, covering a wide range in metallicity and burst strength.
|
[{'version': 'v1', 'created': 'Tue, 18 Jul 2000 15:38:59 GMT'}]
|
2009-10-31
|
[array(['de Paz', 'A. Gil', '', 'Dept.Astrofisica, UCM'], dtype=object)
array(['Zamorano', 'J.', '', 'Dept.Astrofisica, UCM'], dtype=object)
array(['Gallego', 'J.', '', 'Dept.Astrofisica, UCM'], dtype=object)
array(['Dominguez', 'F. de B.', '', 'OTRI, UC3'], dtype=object)]
|
18,122 |
1109.6821
|
Jean Van Schaftingen
|
Jean Van Schaftingen
|
Proving the existence of eigenvalues and eigenvectors by Weierstrass's
theorem
|
5 pages
|
Amer. Math. Monthly 120 (2013), no. 8, 737-742
|
10.4169/amer.math.monthly.120.08.737
| null |
math.RA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I propose a proof of the existence of the existence of eigenvectors and
eigenvalues in the spirit of Argand's proof of the fundamental theorem of
algebra. The proof only relies on Weierstrass's theorem, the definition of the
inverse of a linear operator and algebraic identities.
|
[{'version': 'v1', 'created': 'Thu, 29 Sep 2011 07:33:29 GMT'}]
|
2013-07-10
|
[array(['Van Schaftingen', 'Jean', ''], dtype=object)]
|
18,123 |
1709.10038
|
Hyungsik Roger Moon
|
Khai X. Chiong, Hyungsik Roger Moon
|
Estimation of Graphical Models using the $L_{1,2}$ Norm
| null | null | null | null |
econ.EM stat.ME
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Gaussian graphical models are recently used in economics to obtain networks
of dependence among agents. A widely-used estimator is the Graphical Lasso
(GLASSO), which amounts to a maximum likelihood estimation regularized using
the $L_{1,1}$ matrix norm on the precision matrix $\Omega$. The $L_{1,1}$ norm
is a lasso penalty that controls for sparsity, or the number of zeros in
$\Omega$. We propose a new estimator called Structured Graphical Lasso
(SGLASSO) that uses the $L_{1,2}$ mixed norm. The use of the $L_{1,2}$ penalty
controls for the structure of the sparsity in $\Omega$. We show that when the
network size is fixed, SGLASSO is asymptotically equivalent to an infeasible
GLASSO problem which prioritizes the sparsity-recovery of high-degree nodes.
Monte Carlo simulation shows that SGLASSO outperforms GLASSO in terms of
estimating the overall precision matrix and in terms of estimating the
structure of the graphical model. In an empirical illustration using a classic
firms' investment dataset, we obtain a network of firms' dependence that
exhibits the core-periphery structure, with General Motors, General Electric
and U.S. Steel forming the core group of firms.
|
[{'version': 'v1', 'created': 'Thu, 28 Sep 2017 16:15:30 GMT'}
{'version': 'v2', 'created': 'Sun, 1 Oct 2017 21:32:41 GMT'}]
|
2017-10-03
|
[array(['Chiong', 'Khai X.', ''], dtype=object)
array(['Moon', 'Hyungsik Roger', ''], dtype=object)]
|
18,124 |
1912.01825
|
Lars Ruthotto
|
Lars Ruthotto, Stanley Osher, Wuchen Li, Levon Nurbekyan, Samy Wu Fung
|
A Machine Learning Framework for Solving High-Dimensional Mean Field
Game and Mean Field Control Problems
|
21 pages, 13 figures, 2 table
| null |
10.1073/pnas.1922204117
| null |
cs.LG cs.NA math.NA math.OC stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Mean field games (MFG) and mean field control (MFC) are critical classes of
multi-agent models for efficient analysis of massive populations of interacting
agents. Their areas of application span topics in economics, finance, game
theory, industrial engineering, crowd motion, and more. In this paper, we
provide a flexible machine learning framework for the numerical solution of
potential MFG and MFC models. State-of-the-art numerical methods for solving
such problems utilize spatial discretization that leads to a
curse-of-dimensionality. We approximately solve high-dimensional problems by
combining Lagrangian and Eulerian viewpoints and leveraging recent advances
from machine learning. More precisely, we work with a Lagrangian formulation of
the problem and enforce the underlying Hamilton-Jacobi-Bellman (HJB) equation
that is derived from the Eulerian formulation. Finally, a tailored neural
network parameterization of the MFG/MFC solution helps us avoid any spatial
discretization. Our numerical results include the approximate solution of
100-dimensional instances of optimal transport and crowd motion problems on a
standard work station and a validation using an Eulerian solver in two
dimensions. These results open the door to much-anticipated applications of MFG
and MFC models that were beyond reach with existing numerical methods.
|
[{'version': 'v1', 'created': 'Wed, 4 Dec 2019 06:59:59 GMT'}
{'version': 'v2', 'created': 'Wed, 18 Dec 2019 18:41:41 GMT'}
{'version': 'v3', 'created': 'Sat, 15 Feb 2020 01:15:01 GMT'}]
|
2022-06-08
|
[array(['Ruthotto', 'Lars', ''], dtype=object)
array(['Osher', 'Stanley', ''], dtype=object)
array(['Li', 'Wuchen', ''], dtype=object)
array(['Nurbekyan', 'Levon', ''], dtype=object)
array(['Fung', 'Samy Wu', ''], dtype=object)]
|
18,125 |
2006.01159
|
Kate Alexander
|
Kate D. Alexander (Northwestern/CIERA, NASA Einstein Fellow), Sjoert
van Velzen (NYU), Assaf Horesh (Racah Institute), B. Ashley Zauderer (NSF,
DARK)
|
Radio Properties of Tidal Disruption Events
|
Resubmitted for publication in Springer Space Science Reviews
following referee comments. Chapter in ISSI review "The Tidal Disruption of
Stars by Massive Black Holes" vol. 79. Table 2 is available in
machine-readable format upon request
| null |
10.1007/s11214-020-00702-w
| null |
astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Radio observations of tidal disruption events (TDEs) probe material ejected
by the disruption of stars by supermassive black holes (SMBHs), uniquely
tracing the formation and evolution of jets and outflows, revealing details of
the disruption hydrodynamics, and illuminating the environments around
previously-dormant SMBHs. To date, observations reveal a surprisingly diverse
population. A small fraction of TDEs (at most a few percent) have been observed
to produce radio-luminous mildly relativistic jets. The remainder of the
population are radio quiet, producing less luminous jets, non-relativistic
outflows or, possibly, no radio emission at all. Here, we review the radio
observations that have been made of TDEs to date and discuss possible
explanations for their properties, focusing on detected sources and, in
particular, on the two best-studied events: Sw J1644+57 and ASASSN-14li. We
also discuss what we have learned about the host galaxies of TDEs from radio
observations and review constraints on the rates of bright and faint radio
outflows in TDEs. Upcoming X-ray, optical, near-IR, and radio surveys will
greatly expand the sample of TDEs, and technological advances open the exciting
possibility of discovering a sample of TDEs in the radio band unbiased by host
galaxy extinction.
|
[{'version': 'v1', 'created': 'Mon, 1 Jun 2020 18:00:14 GMT'}]
|
2020-07-08
|
[array(['Alexander', 'Kate D.', '',
'Northwestern/CIERA, NASA Einstein Fellow'], dtype=object)
array(['van Velzen', 'Sjoert', '', 'NYU'], dtype=object)
array(['Horesh', 'Assaf', '', 'Racah Institute'], dtype=object)
array(['Zauderer', 'B. Ashley', '', 'NSF,\n DARK'], dtype=object)]
|
18,126 |
2003.06935
|
Christoph Kawan
|
Christoph Kawan
|
Control of chaos with minimal information transfer
| null | null | null | null |
math.OC math.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper studies set-invariance and stabilization of hyperbolic sets over
rate-limited channels for discrete-time control systems. We first investigate
structural and control-theoretic properties of hyperbolic sets, in particular
such that arise by adding small control terms to uncontrolled systems admitting
(classical) hyperbolic sets. Then we derive a lower bound on the invariance
entropy of a hyperbolic set in terms of the difference between the unstable
volume growth rate and the measure-theoretic fiber entropy of associated random
dynamical systems. We also prove that our lower bound is tight in two extreme
cases. Furthermore, we apply our techniques to the problem of local uniform
stabilization to a hyperbolic set. Finally, we discuss an example built on the
H\'enon horseshoe.
|
[{'version': 'v1', 'created': 'Sun, 15 Mar 2020 21:56:58 GMT'}
{'version': 'v2', 'created': 'Wed, 8 Jul 2020 09:36:12 GMT'}
{'version': 'v3', 'created': 'Sun, 26 Jul 2020 08:03:50 GMT'}
{'version': 'v4', 'created': 'Wed, 19 May 2021 07:11:09 GMT'}]
|
2021-05-20
|
[array(['Kawan', 'Christoph', ''], dtype=object)]
|
18,127 |
1209.5088
|
Lazhar Dhaouadi
|
Lazhar Dhaouadi, Saidani Islem and Hedi Elmonser
|
$q$-Bessel Fourier Transform and Variation Diminishing kernel
| null | null | null | null |
math.QA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we study the variation diminishing kernel as a part of the
$q$-calculus. We introduce the $q$-Macdonald function a newborne in the family
of the $q$-special functions which play a central role in this study.
|
[{'version': 'v1', 'created': 'Sun, 23 Sep 2012 17:12:37 GMT'}
{'version': 'v2', 'created': 'Mon, 29 Oct 2012 18:02:06 GMT'}
{'version': 'v3', 'created': 'Tue, 22 Oct 2019 08:44:16 GMT'}
{'version': 'v4', 'created': 'Thu, 30 Apr 2020 09:51:15 GMT'}]
|
2020-05-01
|
[array(['Dhaouadi', 'Lazhar', ''], dtype=object)
array(['Islem', 'Saidani', ''], dtype=object)
array(['Elmonser', 'Hedi', ''], dtype=object)]
|
18,128 |
physics/0606096
|
Michael Scalora
|
Michael Scalora, Giuseppe D'Aguanno, Neset Akozbek, Marco Centini,
Domenico de Ceglia, Mirko Cappeddu, Nadia Mattiucci, Joseph W. Haus, Mark J.
Bloemer
|
Negative refraction and sub-wavelength imaging using transparent
metal-dielectric stacks
| null | null |
10.1364/OE.15.000508
| null |
physics.optics
| null |
Negative refraction is known to occur in materials that simultaneously
possess a negative electric permittivity and magnetic permeability; hence they
are termed negative index materials. However, there are no known natural
materials that exhibit a negative index of refraction. In large part, interest
in these materials is due to speculation that they could be used as perfect
lenses with superresolution. We propose a new way of achieving negative
refraction with currently available technology, based on transparent,
metallo-dielectric multilayer structures. The advantage of these structures is
that both tunability and transmission (well above 50%) can be achieved in the
visible wavelength regime. We demonstrate both negative refraction and
superresolution in these structures. Our findings point to a simpler way to
fabricate a material that exhibits negative refraction. This opens up an
entirely new path not only for negative refraction, but also to expand the
exploration of wave propagation effects in metals.
|
[{'version': 'v1', 'created': 'Sun, 11 Jun 2006 21:05:08 GMT'}
{'version': 'v2', 'created': 'Sat, 15 Jul 2006 11:22:23 GMT'}]
|
2015-06-26
|
[array(['Scalora', 'Michael', ''], dtype=object)
array(["D'Aguanno", 'Giuseppe', ''], dtype=object)
array(['Akozbek', 'Neset', ''], dtype=object)
array(['Centini', 'Marco', ''], dtype=object)
array(['de Ceglia', 'Domenico', ''], dtype=object)
array(['Cappeddu', 'Mirko', ''], dtype=object)
array(['Mattiucci', 'Nadia', ''], dtype=object)
array(['Haus', 'Joseph W.', ''], dtype=object)
array(['Bloemer', 'Mark J.', ''], dtype=object)]
|
18,129 |
1012.1746
|
Benjamin Reinhard
|
Jens Neu, Bernd Krolla, Oliver Paul, Benjamin Reinhard, Ren\'e
Beigang, Marco Rahm
|
Metamaterial-based gradient index lens with strong focusing in the THz
frequency range
|
6 pages, 4 figures
|
Optics Express 18, 27748-27757 (2010)
|
10.1364/OE.18.027748
| null |
physics.optics
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The development of innovative terahertz (THz) imaging systems has recently
moved in the focus of scientific efforts due to the ability to screen
substances through textiles or plastics. The invention of THz imaging systems
with high spatial resolution is of increasing interest for applications in the
realms of quality control, spectroscopy in dusty environment and security
inspections. One of the main restrictions of current THz imaging systems is the
low spatial resolution which is limited by a lack of THz lenses with strong
focusing capabilities. Here we present the design, fabrication and the
measurement of the optical properties of spectrally broadband
metamaterial-based gradient index (GRIN) lenses that allow one to focus THz
radiation to a spot diameter smaller than the wavelength. Due to the
subwavelength thickness and the high focusing strength the presented GRIN
lenses are an important step towards compact THz imaging systems with strongly
improved spatial resolution.
|
[{'version': 'v1', 'created': 'Wed, 8 Dec 2010 12:00:47 GMT'}]
|
2010-12-21
|
[array(['Neu', 'Jens', ''], dtype=object)
array(['Krolla', 'Bernd', ''], dtype=object)
array(['Paul', 'Oliver', ''], dtype=object)
array(['Reinhard', 'Benjamin', ''], dtype=object)
array(['Beigang', 'René', ''], dtype=object)
array(['Rahm', 'Marco', ''], dtype=object)]
|
18,130 |
math/0509229
|
Jens Wirth
|
Jens Wirth
|
Modified scattering for a wave equation with weak dissipation
|
7 pages
| null | null | null |
math.AP math.CA
| null |
We consider the Cauchy problem for the weakly dissipative wave equation $$
\square u+\frac\mu{1+t} u_t=0 $$ with parameter $\mu\ge2$.
Based on the explicit representations of solutions provided in [Math. Meth.
Appl. Sci. 2004; {\bf 27}:101-124] sharp decay estimates for data from a dense
subspace of the energy space are derived. Furthermore, sharpness is discussed
in terms of a modified scattering theory.
|
[{'version': 'v1', 'created': 'Sat, 10 Sep 2005 06:19:01 GMT'}]
|
2007-05-23
|
[array(['Wirth', 'Jens', ''], dtype=object)]
|
18,131 |
1605.02342
|
Alvar Daza
|
Alvar Daza, Alexandre Wagemakers, Bertrand Georgeot, David
Gu\'ery-Odelin, Miguel A.F. Sanju\'an
|
Basin entropy: a new tool to analyze uncertainty in dynamical systems
|
The supplementary information of this article can be found in:
http://www.nature.com/article-assets/npg/srep/2016/160812/srep31416/extref/srep31416-s1.pdf
|
Scientific Reports, 6, 31416, 2016
|
10.1038/srep31416
| null |
nlin.CD
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In nonlinear dynamics, basins of attraction link a given set of initial
conditions to its corresponding final states. This notion appears in a broad
range of applications where several outcomes are possible, which is a common
situation in neuroscience, economy, astronomy, ecology and many other
disciplines. Depending on the nature of the basins, prediction can be difficult
even in systems that evolve under deterministic rules. From this respect, a
proper classification of this unpredictability is clearly required. To address
this issue, we introduce the basin entropy, a measure to quantify this
uncertainty. Its application is illustrated with several paradigmatic examples
that allow us to identify the ingredients that hinder the prediction of the
final state. The basin entropy provides an efficient method to probe the
behavior of a system when different parameters are varied. Additionally, we
provide a sufficient condition for the existence of fractal basin boundaries:
when the basin entropy of the boundaries is larger than $\log 2 $, the basin is
fractal.
|
[{'version': 'v1', 'created': 'Sun, 8 May 2016 17:40:40 GMT'}
{'version': 'v2', 'created': 'Tue, 30 Aug 2016 12:29:28 GMT'}
{'version': 'v3', 'created': 'Thu, 1 Sep 2016 09:37:30 GMT'}]
|
2016-09-02
|
[array(['Daza', 'Alvar', ''], dtype=object)
array(['Wagemakers', 'Alexandre', ''], dtype=object)
array(['Georgeot', 'Bertrand', ''], dtype=object)
array(['Guéry-Odelin', 'David', ''], dtype=object)
array(['Sanjuán', 'Miguel A. F.', ''], dtype=object)]
|
18,132 |
2209.11463
|
Kathl\'en Kohn
|
Adrian Becedas, Kathl\'en Kohn, Lorenzo Venturello
|
Voronoi diagrams of algebraic varieties under polyhedral norms
| null | null | null | null |
math.AG math.MG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study Voronoi diagrams of manifolds and varieties with respect to
polyhedral norms. We provide upper and lower bounds on the dimensions of
Voronoi cells. For algebraic varieties, we count their full-dimensional Voronoi
cells. As an application, we consider the polyhedral Wasserstein distance
between discrete probability distributions.
|
[{'version': 'v1', 'created': 'Fri, 23 Sep 2022 08:01:06 GMT'}]
|
2022-09-26
|
[array(['Becedas', 'Adrian', ''], dtype=object)
array(['Kohn', 'Kathlén', ''], dtype=object)
array(['Venturello', 'Lorenzo', ''], dtype=object)]
|
18,133 |
cond-mat/0001223
|
Yves-Patrick Pellgerini
|
Yves-Patrick Pellegrini and Marc Barthelemy
|
Self-Consistent Effective-Medium Approximations with Path Integrals
|
18 pages, 6 eps figures
|
Physical Review E 61, 3547 (2000)
|
10.1103/PhysRevE.61.3547
| null |
cond-mat.mtrl-sci cond-mat.dis-nn
| null |
We study effective-medium approximations for linear composite media by means
of a path integral formalism with replicas. We show how to recover the
Bruggeman and Hori-Yonezawa effective-medium formulas. Using a replica-coupling
ansatz, these formulas are extended into new ones which have the same
percolation thresholds as that of the Bethe lattice and Potts model of
percolation, and critical exponents s=0 and t=2 in any space dimension d>= 2.
Like the Bruggeman and Hori-Yonezawa formulas, the new formulas are exact to
second order in the weak-contrast and dilute limits. The dimensional range of
validity of the four effective-medium formulas is discussed, and it is argued
that the new ones are of better relevance than the classical ones in dimensions
d=3,4 for systems obeying the Nodes-Links-Blobs picture, such as
random-resistor networks.
|
[{'version': 'v1', 'created': 'Mon, 17 Jan 2000 11:25:59 GMT'}]
|
2008-04-17
|
[array(['Pellegrini', 'Yves-Patrick', ''], dtype=object)
array(['Barthelemy', 'Marc', ''], dtype=object)]
|
18,134 |
1405.6791
|
Vitaly Feldman
|
Vitaly Feldman and Pravesh Kothari
|
Agnostic Learning of Disjunctions on Symmetric Distributions
| null | null | null | null |
cs.LG cs.CC cs.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the problem of approximating and learning disjunctions (or
equivalently, conjunctions) on symmetric distributions over $\{0,1\}^n$.
Symmetric distributions are distributions whose PDF is invariant under any
permutation of the variables. We give a simple proof that for every symmetric
distribution $\mathcal{D}$, there exists a set of $n^{O(\log{(1/\epsilon)})}$
functions $\mathcal{S}$, such that for every disjunction $c$, there is function
$p$, expressible as a linear combination of functions in $\mathcal{S}$, such
that $p$ $\epsilon$-approximates $c$ in $\ell_1$ distance on $\mathcal{D}$ or
$\mathbf{E}_{x \sim \mathcal{D}}[ |c(x)-p(x)|] \leq \epsilon$. This directly
gives an agnostic learning algorithm for disjunctions on symmetric
distributions that runs in time $n^{O( \log{(1/\epsilon)})}$. The best known
previous bound is $n^{O(1/\epsilon^4)}$ and follows from approximation of the
more general class of halfspaces (Wimmer, 2010). We also show that there exists
a symmetric distribution $\mathcal{D}$, such that the minimum degree of a
polynomial that $1/3$-approximates the disjunction of all $n$ variables is
$\ell_1$ distance on $\mathcal{D}$ is $\Omega( \sqrt{n})$. Therefore the
learning result above cannot be achieved via $\ell_1$-regression with a
polynomial basis used in most other agnostic learning algorithms.
Our technique also gives a simple proof that for any product distribution
$\mathcal{D}$ and every disjunction $c$, there exists a polynomial $p$ of
degree $O(\log{(1/\epsilon)})$ such that $p$ $\epsilon$-approximates $c$ in
$\ell_1$ distance on $\mathcal{D}$. This was first proved by Blais et al.
(2008) via a more involved argument.
|
[{'version': 'v1', 'created': 'Tue, 27 May 2014 05:33:19 GMT'}
{'version': 'v2', 'created': 'Mon, 25 May 2015 21:58:56 GMT'}]
|
2015-05-27
|
[array(['Feldman', 'Vitaly', ''], dtype=object)
array(['Kothari', 'Pravesh', ''], dtype=object)]
|
18,135 |
1701.02252
|
Hans-Thomas Elze
|
Hans-Thomas Elze
|
Quantum models as classical cellular automata
|
11 pages; based on invited talks at Testing Quantum Gravity (Torino,
May 2016) and IARD 2016 (Ljubljana, June 2016), to appear in JPCS. arXiv
admin note: text overlap with arXiv:1604.06652
|
Journal of Physics: Conf. Series 845 (2017) 012022
|
10.1088/1742-6596/845/1/012022
| null |
quant-ph math-ph math.MP nlin.CG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A synopsis is offered of the properties of discrete and integer-valued, hence
"natural", cellular automata (CA). A particular class comprises the
"Hamiltonian CA" with discrete updating rules that resemble Hamilton's
equations. The resulting dynamics is linear like the unitary evolution
described by the Schr\"odinger equation. Employing Shannon's Sampling Theorem,
we construct an invertible map between such CA and continuous quantum
mechanical models which incorporate a fundamental discreteness scale $l$.
Consequently, there is a one-to-one correspondence of quantum mechanical and CA
conservation laws. We discuss the important issue of linearity, recalling that
nonlinearities imply nonlocal effects in the continuous quantum mechanical
description of intrinsically local discrete CA - requiring locality entails
linearity. The admissible CA observables and the existence of solutions of the
$l$-dependent dispersion relation for stationary states are mentioned, besides
the construction of multipartite CA obeying the Superposition Principle. We
point out problems when trying to match the deterministic CA here to those
envisioned in 't Hooft's CA Interpretation of Quantum Mechanics.
|
[{'version': 'v1', 'created': 'Mon, 9 Jan 2017 16:50:04 GMT'}]
|
2017-06-06
|
[array(['Elze', 'Hans-Thomas', ''], dtype=object)]
|
18,136 |
1001.3227
|
Jozef Smak I.
|
J. Smak
|
On the mass transfer rate in SS Cyg
|
7 pages, 1 figure. submitted to Acta Astronomica
|
Acta Astronomica, 60, 83-89, 2010
| null | null |
astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The mass transfer rate in SS Cyg at quiescence, estimated from the observed
luminosity of the hot spot, is log\dotM_tr=16.8+/-0.3. This is safely below the
critical mass transfer rates of log\dotM_crit=18.1 (corresponding to
logT^o_crit=3.88) or log\dotM_crit=17.2 (corresponding to the "revised value of
logT^o_crit=3.65). The mass transfer rate during outbursts is strongly
enhanced.
|
[{'version': 'v1', 'created': 'Tue, 19 Jan 2010 08:54:30 GMT'}]
|
2010-04-12
|
[array(['Smak', 'J.', ''], dtype=object)]
|
18,137 |
1207.5672
|
Gyorgy Dosa
|
Gyorgy Dosa and Zsolt Tuza
|
Bin Packing/Covering with Delivery: Some variations, theoretical results
and efficient offline algorithms
|
16 pages
| null | null | null |
cs.DS cs.DM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the recent paper \cite{BDT10} we introduced a new problem that we call Bin
Packing/Covering with Delivery, or BP/CD for short. Mainly we mean under this
expression that we look for not only a good, but a "good and fast" packing or
covering. In that paper we mainly dealt with only one possible online BP/CD
model, and proposed a new method that we call the Evolution of Algorithms. In
case of such methods a neighborhood structure is defined among algorithms, and
using a metaheuristic (for example simulated annealing) in some sense the best
algorithm is chosen to solve the problem. Now we turn to investigate the
offline case. We define several ways to treat such a BP/CD problem, although we
investigate only one of them here. For the analysis, a novel view on "offline
optimum" is introduced, which appears to be relevant concerning all problems
where a final solution is ordering-dependent. We prove that if the item sizes
are not allowed to be arbitrarily close to zero, then an optimal offline
solution can be found in polynomial time. On the other hand, for unrestricted
problem instances, no polynomial-time algorithm can achieve an approximation
ratio better than 6/7 if $P\ne NP$.
|
[{'version': 'v1', 'created': 'Tue, 24 Jul 2012 12:11:36 GMT'}]
|
2015-03-20
|
[array(['Dosa', 'Gyorgy', ''], dtype=object)
array(['Tuza', 'Zsolt', ''], dtype=object)]
|
18,138 |
0904.0012
|
Paul Koerber
|
Paul Koerber
|
Coisotropic D-branes on AdS4 x CP3 and massive deformations
|
24 pages, 1 figure, v2: due to a serious mistake the claims of the
paper had to be corrected
|
JHEP 0909:008,2009
|
10.1088/1126-6708/2009/09/008
|
MPP-2009-35
|
hep-th math.DG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We scan for massive type IIA SU(3)-structure compactifications of the type
AdS4 x CP3 with internal symmetry group SO(4). This group acts on CP3 with
cohomogeneity one, so that one would expect new non-homogeneous solutions. We
find however that all such solutions enhance their symmetry group to Sp(2) and
form, in fact, the homogeneous family first described in arXiv:0712.1396. This
is in accordance with arXiv:0901.0969, which argues from the CFT-side that
although new vacua with SO(4) symmetry group and N=2 supersymmetry should
exist, they fall outside our ansatz of strict SU(3)-structure, and instead have
genuine SU(3)x SU(3)-structure. We do find that the SO(4)-invariant
description, which singles out one preferential direction in the internal
space, is well-adapted for describing the embedding of AdS4-filling
supersymmetric D8-branes on both the original ABJM configuration as its massive
Sp(2)-symmetric deformations.Supersymmetry requires these D-branes to be of the
coisotropic type, which means in particular that their world-volume gauge field
must be non-trivial.
|
[{'version': 'v1', 'created': 'Wed, 1 Apr 2009 14:51:12 GMT'}
{'version': 'v2', 'created': 'Fri, 5 Jun 2009 13:43:24 GMT'}]
|
2009-09-28
|
[array(['Koerber', 'Paul', ''], dtype=object)]
|
18,139 |
0907.4611
|
Theodoros Gaitanos
|
V. Prassa, T. Gaitanos, G. Ferini, M. Di Toro, G.A. Lalazissis, H.H.
Wolter
|
Isospin Effects on Strangeness in Heavy-Ion Collisions
|
15 papes, 5 figures. Accepted for publication in Nuclear Physics
|
Nucl.Phys.A832:88-99,2010
|
10.1016/j.nuclphysa.2009.11.009
| null |
nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Kaon properties are studied within the framework of a fully covariant
transport approach. The kaon-nucleon potential is evaluated in two schemes, a
chiral perturbative approach and an effective One-Boson-Exchange model. Isospin
effects are explicitly accounted for in both models. The transport calculations
indicate a significant sensitivity of momentum distributions and total yields
of $K^{0,+}$ isospin states on the choice of the kaon-nucleon interaction.
Furthermore, isospin effects are rather moderate on absolute kaon yields, but
appear on strangeness ratios. This is an important issue in determining the
high density symmetry energy from studies of strangeness production in
heavy-ion collisions.
|
[{'version': 'v1', 'created': 'Mon, 27 Jul 2009 12:14:19 GMT'}
{'version': 'v2', 'created': 'Tue, 10 Nov 2009 10:22:26 GMT'}]
|
2010-01-15
|
[array(['Prassa', 'V.', ''], dtype=object)
array(['Gaitanos', 'T.', ''], dtype=object)
array(['Ferini', 'G.', ''], dtype=object)
array(['Di Toro', 'M.', ''], dtype=object)
array(['Lalazissis', 'G. A.', ''], dtype=object)
array(['Wolter', 'H. H.', ''], dtype=object)]
|
18,140 |
2003.09588
|
Eric Lescano
|
Eric Lescano and Nahuel Mir\'on-Granese
|
On the phase space in Double Field Theory
|
33 pages. Published version
|
J. High Energ. Phys. 2020, 239 (2020)
|
10.1007/JHEP07(2020)239
| null |
hep-th gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a model of (double) kinetic theory which paves the way to describe
matter in a Double Field Theory background. Generalized diffeomorphisms acting
on double phase space tensors are introduced. The generalized covariant
derivative is replaced by a generalized Liouville operator as it happens in
relativistic kinetic theory. The section condition is consistently extended and
the closure of the generalized transformations is still given by the C-bracket.
In this context we propose a generalized Boltzmann equation and compute the
moments of the latter, obtaining an expression for the generalized
energy-momentum tensor and its conservation law.
|
[{'version': 'v1', 'created': 'Sat, 21 Mar 2020 06:15:55 GMT'}
{'version': 'v2', 'created': 'Fri, 19 Jun 2020 17:39:34 GMT'}
{'version': 'v3', 'created': 'Sun, 23 Aug 2020 01:58:25 GMT'}]
|
2020-08-25
|
[array(['Lescano', 'Eric', ''], dtype=object)
array(['Mirón-Granese', 'Nahuel', ''], dtype=object)]
|
18,141 |
0810.1034
|
Afshin Shafiee Dr.
|
Afshin Shafiee, Abouzar Massoudi and Mohammad Bahrami
|
On A New Formulation of Micro-phenomena: The Double-slit Experiment
|
17 pages, 6 figures and 1 appendix
| null | null | null |
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Based on the novel view that a micro-entity could be considered as a particle
associated with a field partaking of the energy of particle which are both
described by deterministic causal equations of motion, we examine the success
of our new theory in elucidating the underlying physics of the double-slit
experiment. Here, we explain with clear details how each micro-particle
scatters from one of the slits at a given time. After the scattering through
one of the slits, the particle shares some of its energy with its surrounding
field and a particle-field system is again formed which its motion is governed
by a deterministic dynamics during its flight towards the detecting screen. The
interference pattern is then explained by showing how the final location of
each particle-field system at the time of reaching the detecting screen is
distributed according to an angular distribution (equal to the what quantum
theory predicts for the fringe effects in a two-slit experiment). The
probabilistic nature of such a distribution can be explained by considering the
variations of the kinetic energy of the particle-field system at different
local situations.
|
[{'version': 'v1', 'created': 'Mon, 6 Oct 2008 18:25:36 GMT'}]
|
2008-10-07
|
[array(['Shafiee', 'Afshin', ''], dtype=object)
array(['Massoudi', 'Abouzar', ''], dtype=object)
array(['Bahrami', 'Mohammad', ''], dtype=object)]
|
18,142 |
0807.3428
|
Sergei Maydanyuk
|
Sergei P. Maydanyuk (Institute for Nuclear Research, National Academy
of Sciences of Ukraine)
|
Bremsstrahlung during $\alpha$-decay: quantum multipolar model
|
38 pages, 6 file of figure in EPS format
| null | null | null |
nucl-th hep-ph nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper the improved multipolar model of bremsstrahlung accompanied the
$\alpha$-decay is presented. The angular formalism of calculations of the
matrix elements, being enough complicated component of the model, is stated in
details. A new definition of the angular (differential) probability of the
photon emission in the $\alpha$-decay is proposed where direction of motion of
the $\alpha$-particle outside (with its tunneling inside barrier) is defined on
the basis of angular distribution of its spacial wave function. In such
approach, the model gives values of the angular probability of the photons
emission in absolute scale, without its normalization on experimental data.
Effectiveness of the proposed definition and accuracy of the spectra
calculations of the bremsstrahlung spectra are analyzed in their comparison
with experimental data for the $^{210}{\rm Po}$, $^{214}{\rm Po}$, $^{226}{\rm
Ra}$ and $^{244}{\rm Cm}$ nuclei, and for some other nuclei predictions are
performed (in absolute scale). With a purpose to find characteristics taking
influence on the bremsstrahlung probability strongly, a dependence of the
bremsstrahlung probability on effective charge of the decaying system is
analyzed. As a natural result, as supposed type of decaying system the emission
of proton from nucleus is studied, for which the effective charge is
essentially larger in a comparison with $\alpha$-decay. For some proton
emitters estimations of the bremsstrahlung probability are obtained (at first
time, in fully quantum approach). Also the bremsstrahlung in fission of the
$^{252}{\rm Cf}$ nucleus is analyzed.
|
[{'version': 'v1', 'created': 'Tue, 22 Jul 2008 09:20:41 GMT'}]
|
2008-07-24
|
[array(['Maydanyuk', 'Sergei P.', '',
'Institute for Nuclear Research, National Academy\n of Sciences of Ukraine'],
dtype=object) ]
|
18,143 |
1511.00878
|
Christian Schneider
|
M. Klaas, H. Flayac, M. Amthor, I.G. Savenko, S. Brodbeck, T.
Ala-Nissila, S. Klembt, C. Schneider, S. H\"ofling
|
Evolution of temporal coherence in confined polariton condensates
| null | null |
10.1103/PhysRevLett.120.017401
| null |
cond-mat.quant-gas
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the influence of spatial confinement on the second-order temporal
coherence of the emission from a semiconductor microcavity in the strong
coupling regime. The confinement, provided by etched micropillars, has a
favorable impact on the temporal coherence of solid state quasi-condensates
that evolve in our device above threshold. By fitting the experimental data
with a microscopic quantum theory based on a quantum jump approach, we
scrutinize the influence of pump power and confinement and find that
phonon-mediated transitions are enhanced in the case of a confined structure,
in which the modes split into a discrete set. By increasing the pump power
beyond the condensation threshold, temporal coherence significantly improves in
devices with increased spatial confinement, as revealed in the transition from
thermal to coherent statistics of the emitted light.
|
[{'version': 'v1', 'created': 'Tue, 3 Nov 2015 12:28:59 GMT'}
{'version': 'v2', 'created': 'Wed, 9 May 2018 17:56:45 GMT'}]
|
2018-10-30
|
[array(['Klaas', 'M.', ''], dtype=object)
array(['Flayac', 'H.', ''], dtype=object)
array(['Amthor', 'M.', ''], dtype=object)
array(['Savenko', 'I. G.', ''], dtype=object)
array(['Brodbeck', 'S.', ''], dtype=object)
array(['Ala-Nissila', 'T.', ''], dtype=object)
array(['Klembt', 'S.', ''], dtype=object)
array(['Schneider', 'C.', ''], dtype=object)
array(['Höfling', 'S.', ''], dtype=object)]
|
18,144 |
1907.09112
|
EPTCS
|
Roman Kuznets (TU Wien), Laurent Prosperi (ENS Paris-Saclay), Ulrich
Schmid (TU Wien), Krisztina Fruzsa (TU Wien)
|
Causality and Epistemic Reasoning in Byzantine Multi-Agent Systems
|
In Proceedings TARK 2019, arXiv:1907.08335
|
EPTCS 297, 2019, pp. 293-312
|
10.4204/EPTCS.297.19
| null |
cs.MA cs.DC cs.LO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Causality is an important concept both for proving impossibility results and
for synthesizing efficient protocols in distributed computing. For asynchronous
agents communicating over unreliable channels, causality is well studied and
understood. This understanding, however, relies heavily on the assumption that
agents themselves are correct and reliable. We provide the first epistemic
analysis of causality in the presence of byzantine agents, i.e., agents that
can deviate from their protocol and, thus, cannot be relied upon. Using our new
framework for epistemic reasoning in fault-tolerant multi-agent systems, we
determine the byzantine analog of the causal cone and describe a communication
structure, which we call a multipede, necessary for verifying preconditions for
actions in this setting.
|
[{'version': 'v1', 'created': 'Mon, 22 Jul 2019 03:18:05 GMT'}]
|
2019-07-23
|
[array(['Kuznets', 'Roman', '', 'TU Wien'], dtype=object)
array(['Prosperi', 'Laurent', '', 'ENS Paris-Saclay'], dtype=object)
array(['Schmid', 'Ulrich', '', 'TU Wien'], dtype=object)
array(['Fruzsa', 'Krisztina', '', 'TU Wien'], dtype=object)]
|
18,145 |
1011.6355
|
Marek Arendarczyk
|
Marek Arendarczyk, Krzysztof Debicki
|
Exact asymptotics of supremum of a stationary Gaussian process over a
random interval
| null | null | null | null |
math.PR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Let $\{X(t) : t \in [0, \infty) \}$ be a centered stationary Gaussian
process. We study the exact asymptotics of $\pr (\sup_{s \in [0,T]} X(t) > u)$,
as $u \to \infty$, where $T$ is an independent of \{X(t)\} nonnegative random
variable. It appears that the heaviness of $T$ impacts the form of the
asymptotics, leading to three scenarios: the case of integrable $T$, the case
of $T$ having regularly varying tail distribution with parameter
$\lambda\in(0,1)$ and the case of $T$ having slowly varying tail distribution.
|
[{'version': 'v1', 'created': 'Mon, 29 Nov 2010 20:21:47 GMT'}]
|
2010-11-30
|
[array(['Arendarczyk', 'Marek', ''], dtype=object)
array(['Debicki', 'Krzysztof', ''], dtype=object)]
|
18,146 |
2301.03663
|
Tuomas Takko M.Sc.
|
Tuomas Takko, Kunal Bhattacharya and Kimmo Kaski
|
Modelling exposure between populations using networks of mobility during
Covid-19
|
Supplementary information appended to manuscript. Contents: 15+3
pages, 5+3 figures, 2+1 tables. Submitted to Frontiers in Physics, Social
Physics
| null | null | null |
physics.soc-ph cs.SI
|
http://creativecommons.org/licenses/by/4.0/
|
The use of mobile phone call detail records and device location data for the
calling patterns, movements, and social contacts of individuals, has proven to
be valuable for devising models and understanding of their mobility and
behaviour patterns. In this study we investigate weighted exposure-networks of
human daily activities in the capital region of Finland as a proxy for contacts
between postal code areas during the pre-pandemic year 2019 and pandemic years
2020, 2021 and early 2022. We investigate the suitability of gravity and
radiation type models for reconstructing the exposure-networks based on
geo-spatial and population mobility information. For this we use a mobile phone
dataset of aggregated daily visits from a postal code area to cellphone grid
locations, and treat it as a bipartite network to create weighted one mode
projections using a weighted co-occurrence function. We fit a gravitation model
and a radiation model to the averaged weekly and yearly projection networks
with geo-spatial and socioeconomic variables of the postal code areas and their
populations. We also consider an extended gravity type model comprising of
additional postal area information such as distance via public transportation
and population density. The results show that the co-occurrence of human
activities, or exposure, between postal code areas follows both the gravity and
radiation type interactions, once fitted to the empirical network. The effects
of the pandemic beginning in 2020 can be observed as a decrease of the overall
activity as well as of the exposure of the projected networks. In general, the
results show that the postal code level networks changed to be more proximity
weighted after the pandemic began, following the government imposed
non-pharmaceutical interventions, with differences based on the geo-spatial and
socioeconomic structure of the areas.
|
[{'version': 'v1', 'created': 'Mon, 9 Jan 2023 20:15:54 GMT'}
{'version': 'v2', 'created': 'Mon, 17 Apr 2023 08:32:47 GMT'}]
|
2023-04-18
|
[array(['Takko', 'Tuomas', ''], dtype=object)
array(['Bhattacharya', 'Kunal', ''], dtype=object)
array(['Kaski', 'Kimmo', ''], dtype=object)]
|
18,147 |
2011.01100
|
Benjamin Donovan
|
Benjamin D. Donovan, Randall L. McEntaffer, Casey T. DeRoo, James H.
Tutt, Fabien Gris\'e, Chad M. Eichfel, Oren Z. Gall, Vadim Burwitz, Gisela
Hartner, Carlo Pelliciari, and Marlis-Madeleine La Caria
|
Performance Testing of a Large-Format Reflection Grating Prototype for a
Suborbital Rocket Payload
|
25 pages, 16 figures, preprint of an article accepted for publication
in the Journal of Astronomical Instrumentation \copyright 2020 [copyright
World Scientific Publishing Company]
[https://www.worldscientific.com/worldscinet/jai]
| null | null | null |
astro-ph.IM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The soft X-ray grating spectrometer on board the Off-plane Grating Rocket
Experiment (OGRE) hopes to achieve the highest resolution soft X-ray spectrum
of an astrophysical object when it is launched via suborbital rocket. Paramount
to the success of the spectrometer are the performance of the $>250$ reflection
gratings populating its reflection grating assembly. To test current grating
fabrication capabilities, a grating prototype for the payload was fabricated
via electron-beam lithography at The Pennsylvania State University's Materials
Research Institute and was subsequently tested for performance at Max Planck
Institute for Extraterrestrial Physics' PANTER X-ray Test Facility. Bayesian
modeling of the resulting data via Markov chain Monte Carlo (MCMC) sampling
indicated that the grating achieved the OGRE single-grating resolution
requirement of $R_{g}(\lambda/\Delta\lambda)>4500$ at the 94% confidence level.
The resulting $R_g$ posterior probability distribution suggests that this
confidence level is likely a conservative estimate though, since only a finite
$R_g$ parameter space was sampled and the model could not constrain the upper
bound of $R_g$ to less than infinity. Raytrace simulations of the system found
that the observed data can be reproduced with a grating performing at
$R_g=\infty$. It is therefore postulated that the behavior of the obtained
$R_g$ posterior probability distribution can be explained by a finite
measurement limit of the system and not a finite limit on $R_g$. Implications
of these results and improvements to the test setup are discussed.
|
[{'version': 'v1', 'created': 'Mon, 2 Nov 2020 16:34:03 GMT'}]
|
2020-11-03
|
[array(['Donovan', 'Benjamin D.', ''], dtype=object)
array(['McEntaffer', 'Randall L.', ''], dtype=object)
array(['DeRoo', 'Casey T.', ''], dtype=object)
array(['Tutt', 'James H.', ''], dtype=object)
array(['Grisé', 'Fabien', ''], dtype=object)
array(['Eichfel', 'Chad M.', ''], dtype=object)
array(['Gall', 'Oren Z.', ''], dtype=object)
array(['Burwitz', 'Vadim', ''], dtype=object)
array(['Hartner', 'Gisela', ''], dtype=object)
array(['Pelliciari', 'Carlo', ''], dtype=object)
array(['La Caria', 'Marlis-Madeleine', ''], dtype=object)]
|
18,148 |
1405.0810
|
Stephane Seuret
|
St\'ephane Seuret and Adri\'an Ubis
|
Local $L^2$-regularity of Riemann's Fourier series
|
21 pages, 1 figure
| null | null | null |
math.FA math.MG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We are interested in the convergence and the local regularity of the lacunary
Fourier series $F_s(x) = \sum_{n=1}^{+\infty} \frac{e^{2i\pi n^2 x}}{n^s}$. In
the 1850's, Riemann introduced the series $F_2$ as a possible example of
nowhere differentiable function, and the study of this function has drawn the
interest of many mathematicians since then. We focus on the case when
$1/2<s\leq 1$, and we prove that $F_s(x)$ converges when $x$ satisfies a
Diophantine condition. We also study the $L^2$- local regularity of $F_s$,
proving that the local $L^2$-norm of $F_s$ around a point $x$ behave
differently around different $x$, according again to Diophantine conditions on
$x$.
|
[{'version': 'v1', 'created': 'Mon, 5 May 2014 07:47:08 GMT'}]
|
2014-05-06
|
[array(['Seuret', 'Stéphane', ''], dtype=object)
array(['Ubis', 'Adrián', ''], dtype=object)]
|
18,149 |
hep-ex/0509020
|
Minzu Wang
|
K. Abe, et al. (for the Belle Collaboration)
|
Study of Charmonium Decays into Baryon-Antibaryon Pairs
|
11 pagpes, 6 figures, for LP2005 and EPS2005
| null | null |
BELLE-CONF0534
|
hep-ex
| null |
We study the baryonic charmonium decays of $B$ mesons, $B^+ \to \eta_c K^+$
and $B^+ \to J/\psi K^+$, where $\eta_c$ and $J/\psi$ subsequently decay into a
$p\bar p$ or $\Lambda\bar\Lambda$ pair. The charmonium produced in the above
$B$ meson decays is fully polarized. The polar angular distributions of the
baryon-antibaryon pairs are presented, along with fit results to a $1 +
\alpha_B\cos^2\theta$ parametrization. Comparisons are made with the results
from $e^+e^- \to J/\psi$ formation experiments. We also report the
firstobservation of $\eta_c \to \Lambda\bar\Lambdar$. The measured branching
fraction is ${\mathcal B}(\eta_c \to \Lambda\bar\Lambda) =
(0.87^{+0.24}_{-0.21} \pm 0.14 \pm 0.27) \times 10^{-3}$. This study is based
on a $357~fb^{-1}$ data sample recorded on the $\Upsilon({\rm 4S})$ resonance
with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider.
|
[{'version': 'v1', 'created': 'Fri, 16 Sep 2005 04:04:51 GMT'}]
|
2019-08-14
|
[array(['Abe', 'K.', ''], dtype=object)]
|
18,150 |
1509.04328
|
Neeraj Misra Kumar
|
Neeraj Kumar Misra, Subodh Wairya and Vinod Kumar Singh
|
Evolution of structure of some binary group based n bit comparator,
n-to-2n decoder by reversible technique
|
22 pages, 19 figure, journal
|
International Journal of VLSI design & Communication Systems
(VLSICS) Vol.5, No.5, October 2014
|
10.5121/vlsic.2014.5502
| null |
cs.ET
|
http://creativecommons.org/licenses/by-sa/4.0/
|
Reversible logic has attracted substantial interest due to its low power
consumption which is the main concern of low power VLSI circuit design. In this
paper, a novel 4x4 reversible gate called inventive gate has been introduced
and using this gate 1-bit, 2-bit, 8-bit, 32-bit and n-bit group-based
reversible comparator have been constructed with low value of reversible
parameters. The MOS transistor realizations of 1-bit, 2- bit, and 8-bit of
reversible comparator are also presented and finding power, delay and power
delay product (PDP) with appropriate aspect ratio W/L. Novel inventive gate has
the ability to use as an n-to-2n decoder. Different proposed novel reversible
circuit design style is compared with the existing ones. The relative results
shows that the novel reversible gate wide utility, group-based reversible
comparator outperforms the present design style in terms of number of gates,
garbage outputs and constant input.
|
[{'version': 'v1', 'created': 'Fri, 11 Sep 2015 16:06:51 GMT'}]
|
2015-09-16
|
[array(['Misra', 'Neeraj Kumar', ''], dtype=object)
array(['Wairya', 'Subodh', ''], dtype=object)
array(['Singh', 'Vinod Kumar', ''], dtype=object)]
|
18,151 |
astro-ph/9402041
|
Paul Steinhardt
|
J. Richard Bond, Richard L. Davis, and Paul J. Steinhardt
|
How Well Can Cosmological Parameters Be Estimated from CMB Observations?
|
9 pages, Penn Preprint UPR-0604T
|
Astrophys.Lett.Commun.32:53-62,1995
| null | null |
astro-ph gr-qc
| null |
The CMB anisotropy depends sensitively upon the slope and amplitude of
primordial density and gravitational wave fluctuations, the baryon density, the
Hubble constant, the cosmological constant, the ionization history, {\it etc.}
We report on recent work showing how well multi-scale measurements of the
anisotropy power spectrum can resolve these factors. We identify a hypersurface
in cosmic parameter space that can be accurately localized by observations, but
along which the likelihood will hardly vary. Other cosmic observations will be
needed to break this degeneracy.
|
[{'version': 'v1', 'created': 'Wed, 16 Feb 1994 15:08:00 GMT'}]
|
2009-09-25
|
[array(['Bond', 'J. Richard', ''], dtype=object)
array(['Davis', 'Richard L.', ''], dtype=object)
array(['Steinhardt', 'Paul J.', ''], dtype=object)]
|
18,152 |
2305.11164
|
Joel Casta\~no Fern\'andez
|
Joel Casta\~no, Silverio Mart\'inez-Fern\'andez, Xavier Franch, Justus
Bogner
|
Exploring the Carbon Footprint of Hugging Face's ML Models: A Repository
Mining Study
| null | null | null | null |
cs.LG cs.CY cs.IR stat.ML
|
http://creativecommons.org/licenses/by/4.0/
|
The rise of machine learning (ML) systems has exacerbated their carbon
footprint due to increased capabilities and model sizes. However, there is
scarce knowledge on how the carbon footprint of ML models is actually measured,
reported, and evaluated. In light of this, the paper aims to analyze the
measurement of the carbon footprint of 1,417 ML models and associated datasets
on Hugging Face, which is the most popular repository for pretrained ML models.
The goal is to provide insights and recommendations on how to report and
optimize the carbon efficiency of ML models. The study includes the first
repository mining study on the Hugging Face Hub API on carbon emissions. This
study seeks to answer two research questions: (1) how do ML model creators
measure and report carbon emissions on Hugging Face Hub?, and (2) what aspects
impact the carbon emissions of training ML models? The study yielded several
key findings. These include a decreasing proportion of carbon
emissions-reporting models, a slight decrease in reported carbon footprint on
Hugging Face over the past 2 years, and a continued dominance of NLP as the
main application domain. Furthermore, the study uncovers correlations between
carbon emissions and various attributes such as model size, dataset size, and
ML application domains. These results highlight the need for software
measurements to improve energy reporting practices and promote carbon-efficient
model development within the Hugging Face community. In response to this issue,
two classifications are proposed: one for categorizing models based on their
carbon emission reporting practices and another for their carbon efficiency.
The aim of these classification proposals is to foster transparency and
sustainable model development within the ML community.
|
[{'version': 'v1', 'created': 'Thu, 18 May 2023 17:52:58 GMT'}]
|
2023-05-19
|
[array(['Castaño', 'Joel', ''], dtype=object)
array(['Martínez-Fernández', 'Silverio', ''], dtype=object)
array(['Franch', 'Xavier', ''], dtype=object)
array(['Bogner', 'Justus', ''], dtype=object)]
|
18,153 |
1706.09491
|
Serkant Ali Cetin
|
Serkant Ali \c{C}etin, Evangelos N. Gazis, Bora I\c{s}ildak, Fatih
\"Omer \.Ilday, Konstantinos Kordas, Chariclia Petridou, Yannis K.
Semertzidis, Saleh Sultansoy, G\"okhan \"Unel, Konstantin Zioutas
|
"Higgs" Factory at the Greek-Turkish Border
|
6 pages, 2 figures, 1 table, contribution to the Open Symposium -
European Strategy Preparatory Group, 2012, Krakow, Poland
|
Turkish Journal of Nuclear Sciences (2018), Volume:30, Issue:1.,
pages:24-31
| null | null |
physics.acc-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We would like to propose the construction of the photon collider based "Higgs
factory" in the coming years at the Greek-Turkish border, starting from its
test facility with a high energy photon beam. This proposal was among the
contributions to the Open Symposium of the ESPG'12.
|
[{'version': 'v1', 'created': 'Wed, 28 Jun 2017 21:32:43 GMT'}]
|
2019-11-15
|
[array(['Çetin', 'Serkant Ali', ''], dtype=object)
array(['Gazis', 'Evangelos N.', ''], dtype=object)
array(['Işildak', 'Bora', ''], dtype=object)
array(['İlday', 'Fatih Ömer', ''], dtype=object)
array(['Kordas', 'Konstantinos', ''], dtype=object)
array(['Petridou', 'Chariclia', ''], dtype=object)
array(['Semertzidis', 'Yannis K.', ''], dtype=object)
array(['Sultansoy', 'Saleh', ''], dtype=object)
array(['Ünel', 'Gökhan', ''], dtype=object)
array(['Zioutas', 'Konstantin', ''], dtype=object)]
|
18,154 |
1303.3565
|
Thomas K. Gaisser
|
Thomas K. Gaisser, Todor Stanev and Serap Tilav
|
Cosmic Ray Energy Spectrum from Measurements of Air Showers
|
11 pages, 5 figures, review for Frontiers of Physics
| null | null | null |
astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This review focuses on high-energy cosmic rays in the PeV energy range and
above. Of particular interest is the knee of the spectrum around 3 PeV and the
transition from cosmic rays of Galactic origin to particles from extra-galactic
sources. Our goal is to establish a baseline spectrum from 10^14 to 10^20 eV by
combining the results of many measurements at different energies. In
combination with measurements of the nuclear composition of the primaries, the
shape of the energy spectrum places constraints on the number and spectra of
sources that may contribute to the observed spectrum.
|
[{'version': 'v1', 'created': 'Thu, 14 Mar 2013 19:34:01 GMT'}]
|
2013-03-15
|
[array(['Gaisser', 'Thomas K.', ''], dtype=object)
array(['Stanev', 'Todor', ''], dtype=object)
array(['Tilav', 'Serap', ''], dtype=object)]
|
18,155 |
cond-mat/9911310
|
Oleg Bulashenko
|
O. M. Bulashenko, J. M. Rubi, V. A. Kochelap
|
Self-consistent theory of shot noise in nondegenerate ballistic
conductors
|
21 pages, 11 figs, minor changes
|
Phys. Rev. B 61 (2000) 5511-5529
|
10.1103/PhysRevB.61.5511
| null |
cond-mat.mes-hall
| null |
A self-consistent theory of shot noise in ballistic two-terminal conductors
under the action of long-range Coulomb correlations is presented. Analytical
formulas for the electron distribution function and its fluctuation along the
conductor, which account for the Coulomb correlations, have been derived. Based
upon these formulas, the current-noise reduction factor has been obtained for
biases ranging from thermal to shot-noise limits as dependent on two
parameters: the ratio between the length of the sample and the Debye screening
length \lambda=d/L_D and the applied voltage qU/k_BT. The difference with the
formulas for a vacuum diode is discussed.
|
[{'version': 'v1', 'created': 'Fri, 19 Nov 1999 16:16:59 GMT'}
{'version': 'v2', 'created': 'Tue, 26 Sep 2000 09:23:22 GMT'}]
|
2009-10-31
|
[array(['Bulashenko', 'O. M.', ''], dtype=object)
array(['Rubi', 'J. M.', ''], dtype=object)
array(['Kochelap', 'V. A.', ''], dtype=object)]
|
18,156 |
1403.6041
|
Hannah Price
|
Hannah M. Price, Tomoki Ozawa and Iacopo Carusotto
|
Quantum Mechanics with a Momentum-Space Artificial Magnetic Field
| null |
Phys. Rev. Lett. 113, 190403 (2014)
|
10.1103/PhysRevLett.113.190403
| null |
cond-mat.quant-gas cond-mat.mes-hall quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Berry curvature is a geometrical property of an energy band which acts as
a momentum space magnetic field in the effective Hamiltonian describing
single-particle quantum dynamics. We show how this perspective may be exploited
to study systems directly relevant to ultracold gases and photonics. Given the
exchanged roles of momentum and position, we demonstrate that the global
topology of momentum space is crucially important. We propose an experiment to
study the Harper-Hofstadter Hamiltonian with a harmonic trap that will
illustrate the advantages of this approach and that will also constitute the
first realization of magnetism on a torus.
|
[{'version': 'v1', 'created': 'Mon, 24 Mar 2014 17:01:50 GMT'}
{'version': 'v2', 'created': 'Wed, 4 Jun 2014 12:57:04 GMT'}
{'version': 'v3', 'created': 'Wed, 19 Nov 2014 16:04:41 GMT'}]
|
2014-11-20
|
[array(['Price', 'Hannah M.', ''], dtype=object)
array(['Ozawa', 'Tomoki', ''], dtype=object)
array(['Carusotto', 'Iacopo', ''], dtype=object)]
|
18,157 |
1306.1074
|
Martin Nuss
|
Martin Nuss and Markus Aichhorn
|
Effective model for electronic properties of the quasi one-dimensional
purple bronze Li0.9Mo6O17 based on ab-initio calculations
|
14 pages, 9 figures
|
Phys. Rev. B 89, 045125 (2014)
|
10.1103/PhysRevB.89.045125
| null |
cond-mat.str-el cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the electronic structure of the strongly anisotropic, quasi
low dimensional purple bronze Li0.9Mo6O17. Building on all-electron ab-initio
band structure calculations we obtain an effective model in terms of four
maximally localized Wannier orbitals, which turn out to be far from atomic
like. We find two half-filled orbitals arranged in chains running along one
crystallographic direction, and two full orbitals in perpendicular directions,
respectively. The possibility to reduce this model to only two orbitals forming
two chains per unit cell with inter-chain coupling is discussed. Transport
properties of these models show high anisotropy, reproducing trends of the
experimentally determined values for the dc conductivity. We also consider
basic effects of electron-electron interactions using the (extended)
Variational Cluster Approach and Dynamical Mean Field Theory. We find good
agreement with experimental photo emission data upon adding moderate on-site
interaction of the order of the band width to the ab-initio derived
tight-binding Hamiltonian. The obtained models provide a profound basis for
further investigations on low-energy Luttinger liquid properties or to study
electronic correlations within computational many-body theory.
|
[{'version': 'v1', 'created': 'Wed, 5 Jun 2013 12:11:17 GMT'}
{'version': 'v2', 'created': 'Mon, 20 Jan 2014 08:18:45 GMT'}]
|
2014-01-21
|
[array(['Nuss', 'Martin', ''], dtype=object)
array(['Aichhorn', 'Markus', ''], dtype=object)]
|
18,158 |
2005.12304
|
Arun Madhav Thalapillil
|
Arindam Das, Diptimoy Ghosh, Carlo Giunti, and Arun Thalapillil
|
Neutrino charge constraints from scattering to the weak gravity
conjecture to neutron stars
|
9 pages. Changes in exposition and additional details. Published
version
|
Phys. Rev. D 102, 115009 (2020)
|
10.1103/PhysRevD.102.115009
| null |
hep-ph astro-ph.HE hep-ex hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In various extensions of the Standard Model of particle physics, and
intriguingly even in the three-generation Standard Model without neutrino
masses, neutrinos are allowed to have very tiny electric charges. After a
review of the theoretical scenarios that allow the emergence of such charges,
we discuss the existing observational limits and we derive new stringent direct
upper bounds for the charges of the muon and tau neutrinos. We also point out a
flavor-universal lower bound on neutrino charges which is obtained from the
weak gravity conjecture, that is based on the hypothesis that gravity is the
weakest force. We finally present a new flavor-universal upper bound on
neutrino charges based on astrophysical observations of Magnetars.
|
[{'version': 'v1', 'created': 'Mon, 25 May 2020 18:00:18 GMT'}
{'version': 'v2', 'created': 'Mon, 7 Dec 2020 18:02:43 GMT'}]
|
2021-01-04
|
[array(['Das', 'Arindam', ''], dtype=object)
array(['Ghosh', 'Diptimoy', ''], dtype=object)
array(['Giunti', 'Carlo', ''], dtype=object)
array(['Thalapillil', 'Arun', ''], dtype=object)]
|
18,159 |
2205.04810
|
Lukas Edman
|
Lukas Edman, Antonio Toral, Gertjan van Noord
|
The Importance of Context in Very Low Resource Language Modeling
| null | null | null | null |
cs.CL
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper investigates very low resource language model pretraining, when
less than 100 thousand sentences are available. We find that, in very low
resource scenarios, statistical n-gram language models outperform
state-of-the-art neural models. Our experiments show that this is mainly due to
the focus of the former on a local context. As such, we introduce three methods
to improve a neural model's performance in the low-resource setting, finding
that limiting the model's self-attention is the most effective one, improving
on downstream tasks such as NLI and POS tagging by up to 5% for the languages
we test on: English, Hindi, and Turkish.
|
[{'version': 'v1', 'created': 'Tue, 10 May 2022 11:19:56 GMT'}]
|
2022-05-11
|
[array(['Edman', 'Lukas', ''], dtype=object)
array(['Toral', 'Antonio', ''], dtype=object)
array(['van Noord', 'Gertjan', ''], dtype=object)]
|
18,160 |
1706.08296
|
Flor Allaert
|
F. Allaert (1), G. Gentile (2), M. Baes (1) ((1) Sterrenkundig
Observatorium, Universiteit Gent, (2) Department of Physics and Astrophysics,
Vrije Universiteit Brussel)
|
Testing baryon-induced core formation in $\Lambda$CDM: A comparison of
the DC14 and coreNFW dark matter halo models on galaxy rotation curves
|
19 pages, 12 figures, accepted for publication in A&A
|
A&A 605, A55 (2017)
|
10.1051/0004-6361/201730402
| null |
astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent cosmological hydrodynamical simulations suggest that baryonic
processes, and in particular supernova feedback after bursts of star formation,
can alter the structure of dark matter haloes and transform primordial cusps
into shallower cores. To assess whether this mechanism offers a solution to the
cusp-core controversy, simulated haloes must be compared to real dark matter
haloes inferred from galaxy rotation curves. For this purpose, two new dark
matter density profiles were recently derived from simulations of galaxies in
complementary mass ranges: the DC14 halo ($10^{10} < M_{\text{halo}}/M_{\odot}
< 8 \times 10^{11}$) and the coreNFW halo ($10^{7} < M_{\text{halo}}/M_{\odot}
< 10^{9}$). Both models have individually been found to give good fits to
observed rotation curves. For the DC14 model, however, the agreement of the
predicted halo properties with cosmological scaling relations was confirmed by
one study, but strongly refuted by another. A next question is whether the two
models converge to the same solution in the mass range where both should be
appropriate. To investigate this, we tested the DC14 and cNFW halo models on
the rotation curves of a selection of galaxies with halo masses in the range $4
\times 10^{9}$ - $7 \times 10^{10}$ $M_{\odot}$. We further applied the DC14
model to a set of rotation curves at higher halo masses, up to $9 \times
10^{11}$ $M_{\odot}$, to verify the agreement with the cosmological scaling
relations. We find that both models are generally able to reproduce the
observed rotation curves, in line with earlier results, and the predicted dark
matter haloes are consistent with the cosmological $c-M_{\text{halo}}$ and
$M_{*}-M_{\text{halo}}$ relations. The DC14 and cNFW models are also in fairly
good agreement with each other, even though DC14 tends to predict slightly less
extended cores and somewhat more concentrated haloes than cNFW.
|
[{'version': 'v1', 'created': 'Mon, 26 Jun 2017 09:15:23 GMT'}]
|
2017-09-13
|
[array(['Allaert', 'F.', ''], dtype=object)
array(['Gentile', 'G.', ''], dtype=object)
array(['Baes', 'M.', ''], dtype=object)]
|
18,161 |
1204.2287
|
Mihail Croitoru
|
M. D. Croitoru, M. Houzet, and A. I. Buzdin
|
In-plane magnetic field anisotropy of the FFLO state in layered
superconductors
| null |
Phys. Rev. Lett. 108, 207005 (2012)
|
10.1103/PhysRevLett.108.207005
| null |
cond-mat.supr-con
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
There are strong experimental evidences of the
Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state formation in layered organic
superconductors in parallel magnetic field. We study theoretically the
interplay between the orbital effect and the FFLO modulation in this case and
demonstrate that the in-plane critical field anisotropy drastically changes at
the transition to the FFLO state. The very peculiar angular dependence of the
superconducting onset temperature which is predicted may serve for unambiguous
identification of the FFLO modulation. The obtained results permit us to
suggest the modulated phase stabilization as the origin of the magnetic-field
angle dependence of the onset of superconductivity experimentally observed in
(TMTSF)$_{2}$ClO$_{4}$ organic conductors.
|
[{'version': 'v1', 'created': 'Tue, 10 Apr 2012 21:35:05 GMT'}]
|
2015-06-04
|
[array(['Croitoru', 'M. D.', ''], dtype=object)
array(['Houzet', 'M.', ''], dtype=object)
array(['Buzdin', 'A. I.', ''], dtype=object)]
|
18,162 |
1507.08066
|
Georges Kordopatis
|
G. Kordopatis, R.F.G. Wyse, G. Gilmore, A. Recio-Blanco, P. de
Laverny, V. Hill, V. Adibekyan, U. Heiter, I. Minchev, B. Famaey, T. Bensby,
S. Feltzing, G. Guiglion, A.J. Korn, S. Mikolaitis, A. Vallenari, A. Bayo, G.
Carraro, E. Flaccomio, E. Franciosini, A. Hourihane, P. Jofre, S.E. Koposov,
C. Lardo, J. Lewis, K. Lind, L. Magrini, L. Morbidelli, E. Pancino, S.
Randich, G.G. Sacco, C.C. Worley, S. Zaggia
|
The Gaia-ESO Survey: Characterisation of the [alpha/Fe] sequences in the
Milky Way discs
|
21 pages, 18 figures, accepted for publication in Astronomy &
Astrophysics
|
A&A 582, A122 (2015)
|
10.1051/0004-6361/201526258
| null |
astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate, using the Gaia-ESO Survey internal Data-Release 2, the
properties of the double sequence of the Milky Way discs (defined chemically as
the high-alpha and low-alpha populations), and discuss their compatibility with
discs defined by other means such as metallicity, kinematics or positions.
This investigation uses two different approaches: in velocity space for stars
located in the extended Solar neighbourhood, and in chemical space for stars at
different ranges of Galactocentric radii and heights from the plane. The
separation we find in velocity space allows us to investigate, in a novel
manner, the extent in metallicity of each of the two sequences, identifying
them with the two discs, without making any assumption about the shape of their
metallicity distribution functions. Then, using the separation in chemical
space, we characterise the spatial variation of the slopes of the [alpha/Fe] -
[Fe/H] sequences for the thick and thin discs and the way in which the relative
proportions of the two discs change across the Galaxy.
We find that the thick disc (high-alpha sequence), extends up to [Fe/H]~ +0.2
and the thin disc (low-alpha sequence), at least down to [Fe/H]~ -0.8. Radial
and vertical gradients in alpha-abundances are found for the thin disc, with
mild spatial variations in its [alpha/Fe] - [Fe/H] paths, whereas for the thick
disc we do not detect any such spatial variations.
The small variations in the spatial [alpha/Fe] - [Fe/H] paths of the thin
disc do not allow us to distinguish between formation models of this structure.
On the other hand, the lack of radial gradients and [alpha/Fe] - [Fe/H]
variations for the thick disc indicate that the mechanism responsible for the
mixing of the metals in the young Galaxy (e.g. radial stellar migration or
turbulent gaseous disc) was more efficient before the (present) thin disc
started forming.
|
[{'version': 'v1', 'created': 'Wed, 29 Jul 2015 08:57:53 GMT'}]
|
2015-10-28
|
[array(['Kordopatis', 'G.', ''], dtype=object)
array(['Wyse', 'R. F. G.', ''], dtype=object)
array(['Gilmore', 'G.', ''], dtype=object)
array(['Recio-Blanco', 'A.', ''], dtype=object)
array(['de Laverny', 'P.', ''], dtype=object)
array(['Hill', 'V.', ''], dtype=object)
array(['Adibekyan', 'V.', ''], dtype=object)
array(['Heiter', 'U.', ''], dtype=object)
array(['Minchev', 'I.', ''], dtype=object)
array(['Famaey', 'B.', ''], dtype=object)
array(['Bensby', 'T.', ''], dtype=object)
array(['Feltzing', 'S.', ''], dtype=object)
array(['Guiglion', 'G.', ''], dtype=object)
array(['Korn', 'A. J.', ''], dtype=object)
array(['Mikolaitis', 'S.', ''], dtype=object)
array(['Vallenari', 'A.', ''], dtype=object)
array(['Bayo', 'A.', ''], dtype=object)
array(['Carraro', 'G.', ''], dtype=object)
array(['Flaccomio', 'E.', ''], dtype=object)
array(['Franciosini', 'E.', ''], dtype=object)
array(['Hourihane', 'A.', ''], dtype=object)
array(['Jofre', 'P.', ''], dtype=object)
array(['Koposov', 'S. E.', ''], dtype=object)
array(['Lardo', 'C.', ''], dtype=object)
array(['Lewis', 'J.', ''], dtype=object)
array(['Lind', 'K.', ''], dtype=object)
array(['Magrini', 'L.', ''], dtype=object)
array(['Morbidelli', 'L.', ''], dtype=object)
array(['Pancino', 'E.', ''], dtype=object)
array(['Randich', 'S.', ''], dtype=object)
array(['Sacco', 'G. G.', ''], dtype=object)
array(['Worley', 'C. C.', ''], dtype=object)
array(['Zaggia', 'S.', ''], dtype=object)]
|
18,163 |
1311.2608
|
Antonio Tortora
|
Gustavo A. Fernandez-Alcober, Leire Legarreta, Antonio Tortora and
Maria Tota
|
Some restrictions on normalizers or centralizers in finite p-groups
| null | null | null | null |
math.GR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study three restrictions on normalizers or centralizers in finite
p-groups, namely: (i) |N_G(H) : H| <= p^k for every H non-normal in G, (ii)
|N_G(<g>) : <g>| <= p^k for every <g> non-normal in G, and (iii) |C_G(g) : <g>|
<= p^k for every <g> non-normal in G. We prove that (i) and (ii) are
equivalent, and that the order of a non-Dedekind finite p-group satisfying any
of these three conditions is bounded for p>2. More precisely, we get the best
possible bound for the order of G in all three cases, which is |G| <= p^{2k+2}.
The order of the group cannot be bounded for p=2, but we are able to identify
two infinite families of 2-groups out of which |G| <= 2^{f(k)} for some
function f(k) depending only on k.
|
[{'version': 'v1', 'created': 'Mon, 11 Nov 2013 21:16:32 GMT'}]
|
2013-11-13
|
[array(['Fernandez-Alcober', 'Gustavo A.', ''], dtype=object)
array(['Legarreta', 'Leire', ''], dtype=object)
array(['Tortora', 'Antonio', ''], dtype=object)
array(['Tota', 'Maria', ''], dtype=object)]
|
18,164 |
hep-ph/9411284
|
Jean-Bruno Erismann
|
Pierre Chiappetta
|
Latest Developments on the Bess Model
|
17 pages,LaTeX
| null | null |
CPT-94/P.3075
|
hep-ph
| null |
The idea of a strongly interacting sector as responsible for the electroweak
symmetry breaking is tested through an effective lagrangian description, called
the BESS model, constructed on the standing point of custodial symmetry and
gauge invariance, without specifing any dynamical scheme.
|
[{'version': 'v1', 'created': 'Mon, 14 Nov 1994 08:20:55 GMT'}]
|
2007-05-23
|
[array(['Chiappetta', 'Pierre', ''], dtype=object)]
|
18,165 |
2102.06772
|
Konstantinos Dovelos
|
Konstantinos Dovelos, Michail Matthaiou, Hien Quoc Ngo, and Boris
Bellalta
|
Channel Estimation and Hybrid Combining for Wideband Terahertz Massive
MIMO Systems
|
Submitted to IEEE JSAC; minor revision
| null | null | null |
cs.IT eess.SP math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Terahertz (THz) communication is widely considered as a key enabler for
future 6G wireless systems. However, THz links are subject to high propagation
losses and inter-symbol interference due to the frequency selectivity of the
channel. Massive multiple-input multiple-output (MIMO) along with orthogonal
frequency division multiplexing (OFDM) can be used to deal with these problems.
Nevertheless, when the propagation delay across the base station (BS) antenna
array exceeds the symbol period, the spatial response of the BS array varies
across the OFDM subcarriers. This phenomenon, known as beam squint, renders
narrowband combining approaches ineffective. Additionally, channel estimation
becomes challenging in the absence of combining gain during the training stage.
In this work, we address the channel estimation and hybrid combining problems
in wideband THz massive MIMO with uniform planar arrays. Specifically, we first
introduce a low-complexity beam squint mitigation scheme based on
true-time-delay. Next, we propose a novel variant of the popular orthogonal
matching pursuit (OMP) algorithm to accurately estimate the channel with low
training overhead. Our channel estimation and hybrid combining schemes are
analyzed both theoretically and numerically. Moreover, the proposed schemes are
extended to the multi-antenna user case. Simulation results are provided
showcasing the performance gains offered by our design compared to standard
narrowband combining and OMP-based channel estimation.
|
[{'version': 'v1', 'created': 'Fri, 12 Feb 2021 21:04:01 GMT'}]
|
2021-02-16
|
[array(['Dovelos', 'Konstantinos', ''], dtype=object)
array(['Matthaiou', 'Michail', ''], dtype=object)
array(['Ngo', 'Hien Quoc', ''], dtype=object)
array(['Bellalta', 'Boris', ''], dtype=object)]
|
18,166 |
0907.2002
|
Eilon Solan
|
Dinah Rosenberg, Eilon Solan, Nicolas Vieille
|
On the Optimal Amount of Experimentation in Sequential Decision Problems
| null | null | null | null |
math.PR math.ST stat.TH
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We provide a tight bound on the amount of experimentation under the optimal
strategy in sequential decision problems. We show the applicability of the
result by providing a bound on the cut-off in a one-arm bandit problem.
|
[{'version': 'v1', 'created': 'Sun, 12 Jul 2009 04:02:19 GMT'}]
|
2009-07-14
|
[array(['Rosenberg', 'Dinah', ''], dtype=object)
array(['Solan', 'Eilon', ''], dtype=object)
array(['Vieille', 'Nicolas', ''], dtype=object)]
|
18,167 |
astro-ph/9811085
|
Pierluigi Monaco
|
Pierluigi Monaco (Institute of Astronomy, Cambridge, UK)
|
Dynamics in the cosmological mass function (or, why does the Press &
Schechter work?)
|
12 pages, Latex, uses paspconf.sty and epsf, figures included To be
published in "Observational Cosmology: The Development of Galaxy Systems",
ed. Giuricin et al., ASP Conf. Ser
| null | null | null |
astro-ph
| null |
The Press & Schechter ``numerical recipe'' is briefly reviewed, together with
the recently proposed dynamical mass function theory, in which the mass
function is constructed by using the powerful Lagrangian perturbation theory.
The dynamical mass function is found in good agreement with the recent N-body
simulations of Governato et al. (1998), in the case of an Einstein-de Sitter
Universe. The definition of collapse, the relation between mass and smoothing
radius, and the definition of structure in 1D Universes are discussed. A
detailed comparison of the dynamical mass function to simulations reveals that
the orbit-crossed regions in the simulation are correctly reproduced, while the
fragmentation of the collapsed medium into structures cannot be done in a
univocal way. Finally, we try to answer the question: why the hell does the
Press & Schechter work?
|
[{'version': 'v1', 'created': 'Wed, 4 Nov 1998 20:22:05 GMT'}]
|
2007-05-23
|
[array(['Monaco', 'Pierluigi', '', 'Institute of Astronomy, Cambridge, UK'],
dtype=object) ]
|
18,168 |
1405.4488
|
Hugo Luiz Mariano
|
Hugo Luiz Mariano, Andr\'es Villaveces, Pedro Hernan Zambrano
|
A global approach to AECs
|
10 pages
| null | null | null |
math.LO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work we present some general categorial ideas on Abstract Elementary
Classes (AECs) %\cite{She}, inspired by the totality of AECs of the form
$(Mod(T), \preceq)$, for a first-order theory T: (i) we define a natural notion
of (funtorial) morphism between AECs; (ii) explore the following constructions
of AECs: "generalized" theories, pullbacks of AECs, (Galois) types as AECs;
(iii) apply categorial and topological ideas to encode model-theoretic notions
on spaces of types %(see Michael Lieberman Phd thesis) ; (iv) present the
"local" axiom for AECs here called "local Robinson's property" and an
application (Robinson's diagram method); (v) introduce the category $AEC$ of
Grothendieck's gluings of all AECs (with change of basis); (vi) introduce the
"global" axioms of "tranversal Robinson's property" (TRP) and "global
Robinson's property" (GRP) and prove that TRP is equivalent to GRP and GRP
entails a natural version of Craig interpolation property.
|
[{'version': 'v1', 'created': 'Sun, 18 May 2014 10:49:51 GMT'}]
|
2014-05-20
|
[array(['Mariano', 'Hugo Luiz', ''], dtype=object)
array(['Villaveces', 'Andrés', ''], dtype=object)
array(['Zambrano', 'Pedro Hernan', ''], dtype=object)]
|
18,169 |
1912.04738
|
Hanyuan Hang
|
Hanyuan Hang, Zhouchen Lin, Xiaoyu Liu, Hongwei Wen
|
Histogram Transform Ensembles for Large-scale Regression
|
arXiv admin note: text overlap with arXiv:1911.11581
| null | null | null |
stat.ML cs.LG math.ST stat.TH
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a novel algorithm for large-scale regression problems named
histogram transform ensembles (HTE), composed of random rotations, stretchings,
and translations. First of all, we investigate the theoretical properties of
HTE when the regression function lies in the H\"{o}lder space $C^{k,\alpha}$,
$k \in \mathbb{N}_0$, $\alpha \in (0,1]$. In the case that $k=0, 1$, we adopt
the constant regressors and develop the na\"{i}ve histogram transforms (NHT).
Within the space $C^{0,\alpha}$, although almost optimal convergence rates can
be derived for both single and ensemble NHT, we fail to show the benefits of
ensembles over single estimators theoretically. In contrast, in the subspace
$C^{1,\alpha}$, we prove that if $d \geq 2(1+\alpha)/\alpha$, the lower bound
of the convergence rates for single NHT turns out to be worse than the upper
bound of the convergence rates for ensemble NHT. In the other case when $k \geq
2$, the NHT may no longer be appropriate in predicting smoother regression
functions. Instead, we apply kernel histogram transforms (KHT) equipped with
smoother regressors such as support vector machines (SVMs), and it turns out
that both single and ensemble KHT enjoy almost optimal convergence rates. Then
we validate the above theoretical results by numerical experiments. On the one
hand, simulations are conducted to elucidate that ensemble NHT outperform
single NHT. On the other hand, the effects of bin sizes on accuracy of both NHT
and KHT also accord with theoretical analysis. Last but not least, in the
real-data experiments, comparisons between the ensemble KHT, equipped with
adaptive histogram transforms, and other state-of-the-art large-scale
regression estimators verify the effectiveness and accuracy of our algorithm.
|
[{'version': 'v1', 'created': 'Sun, 8 Dec 2019 16:39:02 GMT'}]
|
2019-12-11
|
[array(['Hang', 'Hanyuan', ''], dtype=object)
array(['Lin', 'Zhouchen', ''], dtype=object)
array(['Liu', 'Xiaoyu', ''], dtype=object)
array(['Wen', 'Hongwei', ''], dtype=object)]
|
18,170 |
1304.6152
|
Rodrigo de Lamare
|
Jingjing Liu, Peng Li and Rodrigo C. de Lamare
|
Iterative Detection and Decoding for MIMO Systems with Knowledge-Aided
Message Passing Algorithms
|
3 figures. Asilomar 2012
| null | null | null |
cs.IT math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we consider the problem of iterative detection and decoding
(IDD) for multi-antenna systems using low-density parity-check (LDPC) codes.
The proposed IDD system consists of a soft-input soft-output parallel
interference (PIC) cancellation scheme with linear minimum mean-square error
(MMSE) receive filters and two novel belief propagation (BP) decoding
algorithms. The proposed BP algorithms exploit the knowledge of short cycles in
the graph structure and the reweighting factors derived from the hypergraph's
expansion. Simulation results show that when used to perform IDD for
multi-antenna systems both proposed BP decoding algorithms can consistently
outperform existing BP techniques with a small number of decoding iterations.
|
[{'version': 'v1', 'created': 'Tue, 23 Apr 2013 02:43:36 GMT'}]
|
2013-04-24
|
[array(['Liu', 'Jingjing', ''], dtype=object)
array(['Li', 'Peng', ''], dtype=object)
array(['de Lamare', 'Rodrigo C.', ''], dtype=object)]
|
18,171 |
2304.01781
|
Marek Eli\'a\v{s}
|
Antonios Antoniadis and Christian Coester and Marek Eli\'a\v{s} and
Adam Polak and Bertrand Simon
|
Mixing predictions for online metric algorithms
| null | null | null | null |
cs.LG cs.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A major technique in learning-augmented online algorithms is combining
multiple algorithms or predictors. Since the performance of each predictor may
vary over time, it is desirable to use not the single best predictor as a
benchmark, but rather a dynamic combination which follows different predictors
at different times. We design algorithms that combine predictions and are
competitive against such dynamic combinations for a wide class of online
problems, namely, metrical task systems. Against the best (in hindsight)
unconstrained combination of $\ell$ predictors, we obtain a competitive ratio
of $O(\ell^2)$, and show that this is best possible. However, for a benchmark
with slightly constrained number of switches between different predictors, we
can get a $(1+\epsilon)$-competitive algorithm. Moreover, our algorithms can be
adapted to access predictors in a bandit-like fashion, querying only one
predictor at a time. An unexpected implication of one of our lower bounds is a
new structural insight about covering formulations for the $k$-server problem.
|
[{'version': 'v1', 'created': 'Tue, 4 Apr 2023 13:18:00 GMT'}]
|
2023-04-05
|
[array(['Antoniadis', 'Antonios', ''], dtype=object)
array(['Coester', 'Christian', ''], dtype=object)
array(['Eliáš', 'Marek', ''], dtype=object)
array(['Polak', 'Adam', ''], dtype=object)
array(['Simon', 'Bertrand', ''], dtype=object)]
|
18,172 |
2107.09943
|
Zheng Sun
|
Zhenhuan Li, Zheng Sun
|
Nonexistence of supersymmetry breaking counterexamples to the
Nelson-Seiberg theorem
|
9 pages; v2: typos, JHEP pre-publication version
|
JHEP 10 (2021) 170
|
10.1007/JHEP10(2021)170
| null |
hep-th hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Counterexample models to the Nelson-Seiberg theorem have been discovered, and
their features have been studied in previous literature. All currently known
counterexamples have generic superpotentials respecting the R-symmetry, and
more R-charge 2 fields than R-charge 0 fields. But they give supersymmetric
vacua with spontaneous R-symmetry breaking, thus violate both the
Nelson-Seiberg theorem and its revisions. This work proves that the other type
of counterexamples do not exist. When there is no R-symmetry, or there are no
more R-charge 2 fields than R-charge 0 fields in models with R-symmetries,
generic superpotentials always give supersymmetric vacua. There exists no
specific arrangement of R-charges or non-R symmetry representations which makes
a counterexample with a supersymmetry breaking vacuum. This nonexistence
theorem contributes to a refined classification of R-symmetric Wess-Zumino
models.
|
[{'version': 'v1', 'created': 'Wed, 21 Jul 2021 08:37:55 GMT'}
{'version': 'v2', 'created': 'Wed, 27 Oct 2021 08:35:51 GMT'}]
|
2021-10-28
|
[array(['Li', 'Zhenhuan', ''], dtype=object)
array(['Sun', 'Zheng', ''], dtype=object)]
|
18,173 |
1708.09489
|
Yusuke Maeda
|
Tatsuya Fukuyama, Sho Nakama, Yusuke T. Maeda
|
Thermal Molecular Focusing: Tunable Cross Effect of Phoresis and
Advection
|
5 pages, 4 figures, and 8 pages for supplemental materials
|
Soft Matter 14, 5519-5524 (2018)
|
10.1039/C8SM00754C
| null |
cond-mat.soft physics.flu-dyn
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The control of solute fluxes through either microscopic phoresis or
hydrodynamic advection is a fundamental way to transport molecules, which are
ubiquitously present in nature and technology. We study the transport of large
solute such as DNA driven by a time-dependent thermal field in a polymer
solution. Heat propagation of a single heat spot moving back and forth gives
rise to the molecular focusing of DNA with frequency-tunable control. We
developed a theoretical model, where heat conduction, viscoelastic expansion of
walls, and the viscosity gradient of a smaller solute are coupled, and that can
explain the underlying hydrodynamic focusing and its interplay with phoretic
transports. This cross effect may allow one to design a unique miniaturized
pump in microfluidics.
|
[{'version': 'v1', 'created': 'Wed, 30 Aug 2017 22:12:23 GMT'}
{'version': 'v2', 'created': 'Tue, 26 Sep 2017 14:52:58 GMT'}]
|
2021-09-29
|
[array(['Fukuyama', 'Tatsuya', ''], dtype=object)
array(['Nakama', 'Sho', ''], dtype=object)
array(['Maeda', 'Yusuke T.', ''], dtype=object)]
|
18,174 |
2102.07130
|
K.P. Krishnaraj
|
K. P. Krishnaraj
|
Emergence of preferred subnetwork for correlated transport in spatial
networks: On the ubiquity of force chains in dense disordered granular
materials
|
Includes Supplemental Material
| null | null | null |
cond-mat.soft cond-mat.dis-nn nlin.PS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Stress in dense granular materials and other athermal particle aggregates is
transmitted through a visually striking subnetwork of interparticle contacts,
the filamentary segments of which are referred to as force chains. The
emergence of such preferred subnetwork in structurally disordered media with
constituents interacting primarily by physical contact is not fully understood.
In this work, we study locally correlated transport in Random Geometric Graphs
(RGGs), and show the spontaneous emergence of preferred subnetwork. Our
findings reveal that, despite structural disorder, system spanning localization
of fluxes transmitted through a spatial network can emerge from short ranged
correlations. The spatial and statistical features of the subnetwork are
surprisingly similar to the strong force network in simulated grain assemblies,
and provides insights on the structure and spatial scale of significance of the
force chains.
|
[{'version': 'v1', 'created': 'Sun, 14 Feb 2021 11:25:43 GMT'}]
|
2021-02-16
|
[array(['Krishnaraj', 'K. P.', ''], dtype=object)]
|
18,175 |
math/0602149
|
Josephine Yu
|
Peter Huggins, Bernd Sturmfels, Josephine Yu, Debbie Yuster
|
The Hyperdeterminant and Triangulations of the 4-Cube
|
30 pages, 6 figures; An author's name changed, typos fixed
|
Mathematics of Computation 77 (2008), no. 263, 1653--1679
|
10.1090/S0025-5718-08-02073-5
| null |
math.CO math.AG
| null |
The hyperdeterminant of format 2 x 2 x 2 x 2 is a polynomial of degree 24 in
16 unknowns which has 2894276 terms. We compute the Newton polytope of this
polynomial and the secondary polytope of the 4-cube. The 87959448 regular
triangulations of the 4-cube are classified into 25448 D-equivalence classes,
one for each vertex of the Newton polytope. The 4-cube has 80876 coarsest
regular subdivisions, one for each facet of the secondary polytope, but only
268 of them come from the hyperdeterminant.
|
[{'version': 'v1', 'created': 'Wed, 8 Feb 2006 04:22:24 GMT'}
{'version': 'v2', 'created': 'Tue, 3 Oct 2006 16:40:08 GMT'}]
|
2015-06-26
|
[array(['Huggins', 'Peter', ''], dtype=object)
array(['Sturmfels', 'Bernd', ''], dtype=object)
array(['Yu', 'Josephine', ''], dtype=object)
array(['Yuster', 'Debbie', ''], dtype=object)]
|
18,176 |
0802.4053
|
Bill Poirier
|
Corey Trahan and Bill Poirier
|
Reconciling Semiclassical and Bohmian Mechanics: III. Scattering states
for continuous potentials
|
16 pages and 14 figures
|
C. Trahan and B. Poirier, J. Chem. Phys. 124, 034116 (2006)
|
10.1063/1.2145923
| null |
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In a previous paper [J. Chem. Phys. 121 4501 (2004)] a unique bipolar
decomposition, Psi = Psi1 + Psi2 was presented for stationary bound states Psi
of the one-dimensional Schroedinger equation, such that the components Psi1 and
Psi2 approach their semiclassical WKB analogs in the large action limit. The
corresponding bipolar quantum trajectories, as defined in the usual Bohmian
mechanical formulation, are classical-like and well-behaved, even when Psi has
many nodes, or is wildly oscillatory. A modification for discontinuous
potential stationary stattering states was presented in a second paper [J.
Chem. Phys. 124 034115 (2006)], whose generalization for continuous potentials
is given here. The result is an exact quantum scattering methodology using
classical trajectories. For additional convenience in handling the tunneling
case, a constant velocity trajectory version is also developed.
|
[{'version': 'v1', 'created': 'Wed, 27 Feb 2008 19:59:16 GMT'}]
|
2009-11-13
|
[array(['Trahan', 'Corey', ''], dtype=object)
array(['Poirier', 'Bill', ''], dtype=object)]
|
18,177 |
0902.0682
|
Andrew Meulenberg Jr.
|
K. P. Sinha and A. Meulenberg
|
Radiative-field quantum-coupling between closely-spaced surfaces
|
10 pages, 5 figures; extension of work reported in
arXiv:cond-mat/0606184 with a new section on computational analysis and
results; submitted to JRSE
| null | null | null |
physics.gen-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A quantum-mechanical formulation of energy transfer between closely-spaced
surfaces is given. Coupling between the two surfaces arises from the atomic
dipole-dipole interaction involving transverse-photon exchange. The exchange of
photons at resonance greatly enhances the radiation transfer. The spacing
(distance) dependence is derived for the quantum well - quantum well situation.
The interaction between two planar quantum wells, separated by a gap is found
to be proportional to the 4th power of the wavelength-to-gapwidth ratio and to
the radiation tunneling factor for the evanescent waves. Expressions for the
net power transfer, in the near-field regime, from hot to cold surface for this
case is given and evaluated for representative materials. Computational
modeling of selected, but realizable, emitter and detector structures and
materials shows the benefits of both near-field and resonance coupling (e.g.,
with 0.1 micron gaps).
|
[{'version': 'v1', 'created': 'Wed, 4 Feb 2009 11:16:05 GMT'}]
|
2009-08-10
|
[array(['Sinha', 'K. P.', ''], dtype=object)
array(['Meulenberg', 'A.', ''], dtype=object)]
|
18,178 |
1105.0699
|
Andreas Baldi
|
Morteza Zahedi, Ali Reza Manashty
|
Robust Sign Language Recognition System Using ToF Depth Cameras
|
6 Pages
|
World of Computer Science and Information Technology Journal
(WCSIT), Vol. 1, No. 3, 50-55, 2011
| null | null |
cs.MM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Sign language recognition is a difficult task, yet required for many
applications in real-time speed. Using RGB cameras for recognition of sign
languages is not very successful in practical situations and accurate 3D
imaging requires expensive and complex instruments. With introduction of
Time-of-Flight (ToF) depth cameras in recent years, it has become easier to
scan the environment for accurate, yet fast depth images of the objects without
the need of any extra calibrating object. In this paper, a robust system for
sign language recognition using ToF depth cameras is presented for converting
the recorded signs to a standard and portable XML sign language named SiGML for
easy transferring and converting to real-time 3D virtual characters animations.
Feature extraction using moments and classification using nearest neighbor
classifier are used to track hand gestures and significant result of 100% is
achieved for the proposed approach.
|
[{'version': 'v1', 'created': 'Tue, 3 May 2011 21:57:18 GMT'}]
|
2011-05-05
|
[array(['Zahedi', 'Morteza', ''], dtype=object)
array(['Manashty', 'Ali Reza', ''], dtype=object)]
|
18,179 |
2306.15232
|
Lea Gassab
|
Lea Gassab, Onur Pusuluk and \"Ozg\"ur E. M\"ustecapl{\i}o\u{g}lu
|
Geometrical optimization of spin clusters for the preservation of
quantum coherence
| null | null | null | null |
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the influence of geometry on the preservation of quantum
coherence in spin clusters subjected to a thermal environment. Assuming weak
inter-spin coupling, we explore the various buffer network configurations that
can be embedded in a plane. Our findings reveal that the connectivity of the
buffer network is crucial in determining the preservation duration of quantum
coherence in an individual central spin. Specifically, we observe that the
maximal planar graph yields the longest preservation time for a given number of
buffer spins. Interestingly, our results demonstrate that the preservation time
does not consistently increase with an increasing number of buffer spins.
Employing a quantum master equation in our simulations, we further demonstrate
that a tetrahedral geometry comprising a four-spin buffer network provides
optimal protection against environmental effects.
|
[{'version': 'v1', 'created': 'Tue, 27 Jun 2023 06:16:44 GMT'}]
|
2023-06-28
|
[array(['Gassab', 'Lea', ''], dtype=object)
array(['Pusuluk', 'Onur', ''], dtype=object)
array(['Müstecaplıoğlu', 'Özgür E.', ''], dtype=object)]
|
18,180 |
1203.6384
|
Sachith Dissanayake
|
S. E. Dissanayake, C. Chan, S. Ji, J. Lee, Y. Qiu, K. C. Rule, B.
Lake, M. Green, M. Hagihala, X. G. Zheng, T. K. Ng, S.-H. Lee
|
Magnetic field-induced instability of the cooperative paramagnetic state
in Zn$_x$Co$_{4-x}$(OD)$_6$Cl$_2$
|
5 pages, 4 figures, 1 table
|
Phys. Rev. B 85, 174435 (2012)
|
10.1103/PhysRevB.85.174435
| null |
cond-mat.str-el
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using elastic and inelastic neutron scattering techniques with and without
application of an external magnetic field $H$, the magnetic ground states of
Zn$_x$Co$_{4-x}$(OD)$_6$Cl$_2$ ($x=0,1$) were studied. Our results show that
for $x=0$, the ground state is a magnetic long-range ordered (LRO) state where
each tetrahedron forms an "umbrella"-type structure. On the other hand, for
$x=1$, no static ordering was observed down to 1.5 K, which resembles the
behavior found in the isostructural quantum system
Zn$_x$Cu$_{4-x}$(OD)$_6$Cl$_2$. When $H$ field is applied, however the $x=1$
system develops the same LRO state as $x=0$. This indicates that the $x=1$
disordered state is in the vicinity of the $x=0$ ordered state.
|
[{'version': 'v1', 'created': 'Wed, 28 Mar 2012 21:27:45 GMT'}]
|
2016-01-29
|
[array(['Dissanayake', 'S. E.', ''], dtype=object)
array(['Chan', 'C.', ''], dtype=object)
array(['Ji', 'S.', ''], dtype=object)
array(['Lee', 'J.', ''], dtype=object)
array(['Qiu', 'Y.', ''], dtype=object)
array(['Rule', 'K. C.', ''], dtype=object)
array(['Lake', 'B.', ''], dtype=object)
array(['Green', 'M.', ''], dtype=object)
array(['Hagihala', 'M.', ''], dtype=object)
array(['Zheng', 'X. G.', ''], dtype=object)
array(['Ng', 'T. K.', ''], dtype=object)
array(['Lee', 'S. -H.', ''], dtype=object)]
|
18,181 |
0805.0701
|
Otmar Stahl
|
O. Stahl, G. Wade, V. Petit, B. Stober, L. Schanne
|
Long-term monitoring of theta1 OriC: the spectroscopic orbit and an
improved rotational period
|
13 pages, 6 figures, accepted for publication in A&A
| null |
10.1051/0004-6361:200809935
| null |
astro-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The young O-type star theta1 OriC, the brightest star of the Trapezium
cluster in Orion, is one of only two known magnetic rotators among the O stars.
However, not all spectroscopic variations of this star can be explained by the
magnetic rotator model. We present results from a long-term monitoring to study
these unexplained variations and to improve the stellar rotational period. We
want to study long-term trends of the radial velocity of theta1 OriC, to search
for unusual changes, to improve the established rotational period and to check
for possible period changes. We combine a large set of published spectroscopic
data with new observations and analyze the spectra in a homogeneous way. We
study the radial velocity from selected photo-spheric lines and determine the
equivalent width of the Halpha and HeII4686 lines. We find evidence for a
secular change of the radial velocity of theta1 OriC that is consistent with
the published interferometric orbit. We refine the rotational period of theta1
OriC and discuss the possibility of detecting period changes in the near
future.
|
[{'version': 'v1', 'created': 'Tue, 6 May 2008 11:40:32 GMT'}
{'version': 'v2', 'created': 'Fri, 13 Jun 2008 11:01:42 GMT'}]
|
2009-11-13
|
[array(['Stahl', 'O.', ''], dtype=object)
array(['Wade', 'G.', ''], dtype=object)
array(['Petit', 'V.', ''], dtype=object)
array(['Stober', 'B.', ''], dtype=object)
array(['Schanne', 'L.', ''], dtype=object)]
|
18,182 |
1605.03003
|
John Imbrie
|
John Z Imbrie
|
Diagonalization and Many-Body Localization for a Disordered Quantum Spin
Chain
|
5 pages, 1 figure. To appear in Phys. Rev. Lett
|
Phys. Rev. Lett. 117, 027201 (2016)
|
10.1103/PhysRevLett.117.027201
| null |
math-ph cond-mat.dis-nn math.MP math.SP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a weakly interacting quantum spin chain with random local
interactions. We prove that many-body localization follows from a physically
reasonable assumption that limits the extent of level attraction in the
statistics of eigenvalues. In a KAM-style construction, a sequence of local
unitary transformations is used to diagonalize the Hamiltonian by deforming the
initial tensor product basis into a complete set of exact many-body
eigenfunctions.
|
[{'version': 'v1', 'created': 'Tue, 10 May 2016 13:30:56 GMT'}]
|
2016-07-07
|
[array(['Imbrie', 'John Z', ''], dtype=object)]
|
18,183 |
2301.13673
|
Devojyoti Kansabanik Kansabanik
|
Devojyoti Kansabanik, Surajit Mondal, Divya Oberoi, Puja Majee
|
Space Weather Research using Spectropolarimetric Radio Imaging Combined
With Aditya-L1 and PUNCH Missions
|
Conference proceedings, The 21st Cambridge Workshop on Cool Stars,
Stellar Systems, and the Sun (CS21)(7 pages, 4 figures)
| null |
10.5281/zenodo.7586149
| null |
astro-ph.SR astro-ph.IM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Low-frequency radio observations have been expected to serve as a powerful
tool for Space Weather (SW) observations for decades. Radio observations are
sensitive to a wide range of SW-related observations ranging from emissions
from coronal mass ejections (CMEs) to the solar wind. Ground-based radio
observatories allow one gathering of high-sensitivity data at high time and
spectral resolution for an extended period, which remains a challenge for most
space-based observatories. While radio techniques like Interplanetary
Scintillation (IPS) are well established, radio imaging studies have remained
technically challenging. This is now changing with the confluence of data from
instruments, like the Murchison Widefield Array (MWA), and robust unsupervised
analysis pipelines. This pipeline delivers full Stokes radio images with
unprecedented fidelity and dynamic range. This will serve as a powerful tool
for coronal and heliospheric studies. We present the recent developments and
achievements to measure the magnetic fields of the CME plasma and shock front
at coronal heights and also share the current status of the objective to
measure the heliospheric Faraday rotation towards numerous background linearly
polarised radio sources with the Sun in the field of view. We envision that in
the coming years, the availability of new-generation radio instruments combined
with the Aditya-L1 and PUNCH mission will mark the start of a new era in Space
Weather modeling and prediction.
|
[{'version': 'v1', 'created': 'Tue, 31 Jan 2023 14:45:18 GMT'}]
|
2023-02-01
|
[array(['Kansabanik', 'Devojyoti', ''], dtype=object)
array(['Mondal', 'Surajit', ''], dtype=object)
array(['Oberoi', 'Divya', ''], dtype=object)
array(['Majee', 'Puja', ''], dtype=object)]
|
18,184 |
2105.02948
|
Mariano Su\'arez-\'Alvarez
|
Mariano Su\'arez-\'Alvarez
|
A simple homological characterization of string algebras of finite
representation type
|
13 pages, 4 figures
| null | null | null |
math.RT math.KT
|
http://creativecommons.org/licenses/by-sa/4.0/
|
We prove that among the finite dimensional algebras of finite representation
type those that are string algebras are precisely the ones that have the
property that the middle term of an arbitrary extension of indecomposable
modules has at most two direct factors. On the other hand, we show that
non-domestic string algebras are very far from having that property.
|
[{'version': 'v1', 'created': 'Thu, 6 May 2021 20:57:36 GMT'}]
|
2021-05-10
|
[array(['Suárez-Álvarez', 'Mariano', ''], dtype=object)]
|
18,185 |
1610.06921
|
Yao Shen
|
Yao Shen and Yu-Zhu Chen
|
Optical Properties of Synthetic Cannabinoids with Negative Indexes
|
13 pages, 8 figures
| null |
10.1007/s11433-017-9042-5
| null |
physics.chem-ph physics.optics
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Some kinds of psychoactive drugs have the structures which are called
split-ring resonators (SRRs). SRRs might result in negative permittivity and
permeability simultaneously in electromagnetic field. Simultaneous negative
indexes can lead to the famous phenomenon of negative refraction. This optical
property makes it possible to distinguish synthetic cannabinoids from other
abusive psychoactive drugs in the UV-vis region. This optical method is
non-damaged and superior in forensic science. In this paper, we use
tight-binding model calculating the permittivity and permeability of the main
ingredients of synthetic cannabinoids. At the same time, we give two more
results of zolpidem and caffeine. Further we discuss the negative refraction of
the category of zepam qualitatively.
|
[{'version': 'v1', 'created': 'Fri, 21 Oct 2016 04:17:08 GMT'}]
|
2017-05-29
|
[array(['Shen', 'Yao', ''], dtype=object)
array(['Chen', 'Yu-Zhu', ''], dtype=object)]
|
18,186 |
hep-ph/0012046
|
Kang Sin Kyu
|
Sin Kyu Kang and C. S. Kim
|
Majorana Neutrino Masses and Neutrino Oscillations
|
14 pages, RevTex
|
Phys.Rev. D63 (2001) 113010
|
10.1103/PhysRevD.63.113010
| null |
hep-ph
| null |
We examine some patterns of Majorana neutrino mass matrix which is compatible
with the phenomenological lepton flavor mixing matrix and non-observation of
neutrinoless double beta decay. Imposing $(M_{\nu})_{ee}=0$ for the Majorana
neutrino mass matrix in the leading order, we obtain a relationship between the
solar mixing angle and the neutrino masses $m_1$ and $m_2$. Additional possible
texture zeros are assigned to the mass matrix so as for the nonvanishing
$\theta_{13}$ to be predictable in terms of neutrino masses. We also show how
three neutrino masses can be predicted from the solar mixing angle and the
experimental results of $\Delta m^2_{sol}$ and $\Delta m^2_{atm}$ in this
framework, and we discuss naturality of the forms of the mass matrix found in
our work.
|
[{'version': 'v1', 'created': 'Tue, 5 Dec 2000 10:22:09 GMT'}]
|
2009-10-31
|
[array(['Kang', 'Sin Kyu', ''], dtype=object)
array(['Kim', 'C. S.', ''], dtype=object)]
|
18,187 |
2109.13608
|
Jakub Zakrzewski
|
Piotr Sierant and Jakub Zakrzewski
|
Challenges to observation of many-body localization
|
Author accepted version to appear in PRB
|
Phys. Rev. B 105, 224203 (2022)
|
10.1103/PhysRevB.105.224203
| null |
cond-mat.dis-nn cond-mat.quant-gas cond-mat.stat-mech quant-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We study time dynamics of 1D disordered Heisenberg spin-1/2 chain focusing on
a regime of large system sizes and a long time evolution. This regime is
relevant for observation of many-body localization (MBL), a phenomenon that is
expected to freeze the dynamics of the system and prevent it from reaching
thermal equilibrium. Performing extensive numerical simulations of the
imbalance, a quantity often employed in the experimental studies of MBL, we
show that the regime of a slow power-law decay of imbalance persists to
disorder strengths exceeding by at least a factor of 2 the current estimates of
the critical disorder strength for MBL. Even though we investigate time
evolution up to few thousands tunneling times, we observe no signs of the
saturation of imbalance that would suggest freezing of system dynamics and
provide a smoking gun evidence of MBL. We demonstrate that the situation is
qualitatively different when the disorder is replaced by a quasiperiodic
potential. In this case, we observe an emergence of a pattern of oscillations
of the imbalance that is stable with respect to changes in the system size.
This suggests that the dynamics of quasiperiodic systems remain fully local at
the longest time scales we reach provided that the quasiperiodic potential is
sufficiently strong. Our study identifies challenges in an unequivocal
experimental observation of the phenomenon of MBL.
|
[{'version': 'v1', 'created': 'Tue, 28 Sep 2021 10:48:00 GMT'}
{'version': 'v2', 'created': 'Fri, 4 Feb 2022 10:20:19 GMT'}
{'version': 'v3', 'created': 'Sun, 5 Jun 2022 12:29:43 GMT'}]
|
2022-08-02
|
[array(['Sierant', 'Piotr', ''], dtype=object)
array(['Zakrzewski', 'Jakub', ''], dtype=object)]
|
18,188 |
1601.06757
|
John Malcolm
|
John D. Malcolm and Elisabeth J. Nicol
|
Frequency-dependent polarizability, plasmons, and screening in the 2D
pseudospin-1 dice lattice
|
Revised version correcting an error; 8 pages, 8 figures; Submitted
for publication in PRB
|
Phys. Rev. B 93, 165433 (2016)
|
10.1103/PhysRevB.93.165433
| null |
cond-mat.mes-hall cond-mat.mtrl-sci cond-mat.str-el
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the dynamic polarizability under the random phase approximation
for the dice lattice. This two-dimensional system gives rise to massless Dirac
fermions with pseudospin-1 in the low-energy quantum excitation spectrum,
providing a Dirac-cone plus flat-band dispersion. Due to the presence of the
flat band, the polarizability shows key differences to that of graphene (the
pseudospin-1/2 Dirac material). We find that the plasmon branch is pinched in
to a single point, $\omega_p=q=\mu$, independent of the background dielectric
constant. Finally, screening effects are discussed with regard to impurities.
|
[{'version': 'v1', 'created': 'Mon, 25 Jan 2016 20:29:49 GMT'}
{'version': 'v2', 'created': 'Fri, 11 Mar 2016 22:52:10 GMT'}]
|
2016-05-04
|
[array(['Malcolm', 'John D.', ''], dtype=object)
array(['Nicol', 'Elisabeth J.', ''], dtype=object)]
|
18,189 |
1307.7106
|
Matthew Tucker-Simmons
|
Ulrich Kraehmer and Matthew Tucker-Simmons
|
On the Dolbeault--Dirac Operator of Quantized Symmetric Spaces
|
25 pages
| null | null | null |
math.QA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Dolbeault complex of a quantized compact Hermitian symmetric space is
expressed in terms of the Koszul complex of a braided symmetric algebra of
Berenstein and Zwicknagl. This defines a spectral triple quantizing the
Dolbeault-Dirac operator associated to the canonical spin^c structure.
|
[{'version': 'v1', 'created': 'Fri, 26 Jul 2013 17:29:12 GMT'}
{'version': 'v2', 'created': 'Sun, 21 Dec 2014 19:41:37 GMT'}]
|
2014-12-23
|
[array(['Kraehmer', 'Ulrich', ''], dtype=object)
array(['Tucker-Simmons', 'Matthew', ''], dtype=object)]
|
18,190 |
1605.05033
|
Ikuko Hamamoto
|
Ikuko Hamamoto
|
Shell-structure of one-particle resonances in deformed potentials
|
16 pages and 3 figures
|
Phys. Rev. C93, 054328 (2016)
|
10.1103/PhysRevC.93.054328
| null |
nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Shell structure of low-lying neutron resonant levels in axially-symmetric
quadrupole-deformed potentials is discussed, which seems analogous to that of
weakly-bound neutrons. As numerical examples, nuclei slightly outside the
neutron-drip-line, $^{39}_{12}$Mg$_{27}$ and $^{21}_{6}$C$_{15}$, are studied.
For the lowest resonance I obtain $I^{\pi}$ = $\Omega^{\pi}$ = 5/2$^{-}$ for
$^{39}$Mg which is likely to be prolately deformed, while $I^{\pi}$ =
$\Omega^{\pi}$ = 1/2$^{+}$ may be assigned to the nucleus $^{21}$C which may be
oblately deformed. Consequently, $^{21}$C will not be observed as a
recognizable resonant state, in agreement with the experimental information.
|
[{'version': 'v1', 'created': 'Tue, 17 May 2016 06:48:07 GMT'}]
|
2016-06-22
|
[array(['Hamamoto', 'Ikuko', ''], dtype=object)]
|
18,191 |
1006.2585
|
Alexander Roitershtein
|
Iddo Ben-Ari, Anastasios Matzavinos, and Alexander Roitershtein
|
On a species survival model
| null | null | null | null |
math.PR q-bio.PE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we provide some sharp asymptotic results for a stochastic model
of species survival recently proposed by Guiol, Marchado, and Schinazi.
|
[{'version': 'v1', 'created': 'Mon, 14 Jun 2010 01:27:32 GMT'}]
|
2010-06-15
|
[array(['Ben-Ari', 'Iddo', ''], dtype=object)
array(['Matzavinos', 'Anastasios', ''], dtype=object)
array(['Roitershtein', 'Alexander', ''], dtype=object)]
|
18,192 |
physics/0102005
|
R. M. Kiehn
|
R. M. Kiehn
|
Instability patterns, wakes and topological limnit sets
|
16 pages pdf
| null | null | null |
physics.flu-dyn
| null |
Many hydrodynamic instability patterns can be put into correspondence with a
subset of characteristic surfaces of tangential discontinuities. These
topological limits sets to systems of hyperbolic PDE's are locally unstable,
but a certain subset associated with minimal surfaces are globally stabilized,
persistent and non-dissipative. Sections of these surfaces are the spiral
scrolls so often observed in hydrodynamic wakes. This method of wake production
does not depend explicitly upon viscosity.
|
[{'version': 'v1', 'created': 'Sat, 3 Feb 2001 21:22:06 GMT'}]
|
2007-05-23
|
[array(['Kiehn', 'R. M.', ''], dtype=object)]
|
18,193 |
hep-th/9710124
|
Jaime Gomis
|
Duiliu-Emanuel Diaconescu and Jaume Gomis (Rutgers University)
|
Neveu-Schwarz Five-Branes And Matrix String Theory On K3
|
harvmac, 12 pages, some changes in the T-duality on K3 section
|
Phys.Lett. B426 (1998) 287-293
|
10.1016/S0370-2693(98)00285-8
|
RU-97-80
|
hep-th
| null |
The Matrix theory description of Type IIA string theory on a compact K3
surface as the theory of Neveu-Schwarz five-branes on $\tilde{K3}\times S^1$ is
analyzed. The full multiplet of space-time BPS states is identified in the
five-brane world-volume as fluxes.
|
[{'version': 'v1', 'created': 'Wed, 15 Oct 1997 21:35:13 GMT'}
{'version': 'v2', 'created': 'Tue, 6 Jan 1998 17:10:08 GMT'}
{'version': 'v3', 'created': 'Mon, 12 Jan 1998 18:08:13 GMT'}]
|
2009-10-30
|
[array(['Diaconescu', 'Duiliu-Emanuel', '', 'Rutgers University'],
dtype=object)
array(['Gomis', 'Jaume', '', 'Rutgers University'], dtype=object)]
|
18,194 |
2302.07748
|
Seyed Mahed Mousavi
|
Seyed Mahed Mousavi, Shohei Tanaka, Gabriel Roccabruna, Koichiro
Yoshino, Satoshi Nakamura, Giuseppe Riccardi
|
Whats New? Identifying the Unfolding of New Events in Narratives
| null | null | null | null |
cs.CL
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
Narratives include a rich source of events unfolding over time and context.
Automatic understanding of these events provides a summarised comprehension of
the narrative for further computation (such as reasoning). In this paper, we
study the Information Status (IS) of the events and propose a novel challenging
task: the automatic identification of \textit{new} events in a narrative. We
define an event as a triplet of subject, predicate, and object. The event is
categorized as new with respect to the discourse context and whether it can be
inferred through commonsense reasoning. We annotated a publicly available
corpus of narratives with the new events at sentence level using human
annotators. We present the annotation protocol and study the quality of the
annotation and the difficulty of the task. We publish the annotated dataset,
annotation materials, and machine learning baseline models for the task of new
event extraction for narrative understanding.
|
[{'version': 'v1', 'created': 'Wed, 15 Feb 2023 15:54:01 GMT'}
{'version': 'v2', 'created': 'Mon, 20 Feb 2023 16:25:57 GMT'}
{'version': 'v3', 'created': 'Thu, 25 May 2023 10:24:53 GMT'}]
|
2023-05-26
|
[array(['Mousavi', 'Seyed Mahed', ''], dtype=object)
array(['Tanaka', 'Shohei', ''], dtype=object)
array(['Roccabruna', 'Gabriel', ''], dtype=object)
array(['Yoshino', 'Koichiro', ''], dtype=object)
array(['Nakamura', 'Satoshi', ''], dtype=object)
array(['Riccardi', 'Giuseppe', ''], dtype=object)]
|
18,195 |
2302.09341
|
Kai Sun
|
Kaiyang Huang, Min Xiong, Yang Liu, Kai Sun, Feng Qiu
|
A Heterogeneous Multiscale Method for Power System Simulation
Considering Electromagnetic Transients
|
Accepted by IEEE PES General Meeting, July 16-20, 2023, Orlando,
Florida
| null | null | null |
math.DS cs.NA cs.SY eess.SY math.NA
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
Traditional dynamic security assessment faces challenges as power systems are
experiencing a transformation to inverter-based-resource (IBR) dominated
systems, for which electromagnetic transient (EMT) dynamics have to be
considered. However, EMT simulation is time-consuming especially for a large
power grid because the mathematical model based on detailed component modeling
is highly stiff and needs to be integrated at tiny time steps due to numerical
stability. This paper proposes a heterogeneous multiscale method (HMM) to
address the simulation of a power system considering EMT dynamics as a
multiscale problem. The method aims to accurately simulate the macroscopic
dynamics of the system even when EMT dynamics are dominating. By force
estimation using a kernel function, the proposed method automatically generates
a macro model on the fly of simulation based on the micro model of EMT
dynamics. It can flexibly switch between the micro- and macro-models to capture
important EMT dynamics during some time intervals while skipping over other
time intervals of less interest to achieve a superior simulation speed. The
method is illustrated by a case study on a two-machine EMT model to demonstrate
its potential for power system simulation.
|
[{'version': 'v1', 'created': 'Sat, 18 Feb 2023 14:15:04 GMT'}]
|
2023-02-21
|
[array(['Huang', 'Kaiyang', ''], dtype=object)
array(['Xiong', 'Min', ''], dtype=object)
array(['Liu', 'Yang', ''], dtype=object)
array(['Sun', 'Kai', ''], dtype=object)
array(['Qiu', 'Feng', ''], dtype=object)]
|
18,196 |
1508.00460
|
Artur De Araujo
|
Artue de Araujo
|
Generalized Quivers, Orthogonal and Symplectic Representations, and
Hitchin-Kobayashi Correspondences
| null | null | null | null |
math.AG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review the theory of quiver bundles over a K\"ahler manifold, and then
introduce the concept of generalized quiver bundles for an arbitrary reductive
group G. We first study the case when G=O(V) or Sp(V), interpreting them as
orthogonal (resp. symplectic) bundle representations of the symmetric quivers
introduced by Derksen-Weyman. We also study supermixed quivers, which
simultaneously involve both orthogonal and symplectic symmetries. Finally, we
discuss Hitchin-Kobayashi correspondences for these objects.
|
[{'version': 'v1', 'created': 'Mon, 3 Aug 2015 15:53:14 GMT'}]
|
2015-08-04
|
[array(['de Araujo', 'Artue', ''], dtype=object)]
|
18,197 |
2202.03103
|
Dennis Klau
|
Matthias Engelbach, Dennis Klau, Jens Drawehn, Maximilien Kintz
|
Combining Deep Learning and Reasoning for Address Detection in
Unstructured Text Documents
|
5 pages, 1 figure, submitted to AAAI-22 workshop CLeaR, peer reviewed
| null | null | null |
cs.AI cs.IR cs.LG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Extracting information from unstructured text documents is a demanding task,
since these documents can have a broad variety of different layouts and a
non-trivial reading order, like it is the case for multi-column documents or
nested tables. Additionally, many business documents are received in paper
form, meaning that the textual contents need to be digitized before further
analysis. Nonetheless, automatic detection and capturing of crucial document
information like the sender address would boost many companies' processing
efficiency. In this work we propose a hybrid approach that combines deep
learning with reasoning for finding and extracting addresses from unstructured
text documents. We use a visual deep learning model to detect the boundaries of
possible address regions on the scanned document images and validate these
results by analyzing the containing text using domain knowledge represented as
a rule based system.
|
[{'version': 'v1', 'created': 'Mon, 7 Feb 2022 12:32:00 GMT'}]
|
2022-02-08
|
[array(['Engelbach', 'Matthias', ''], dtype=object)
array(['Klau', 'Dennis', ''], dtype=object)
array(['Drawehn', 'Jens', ''], dtype=object)
array(['Kintz', 'Maximilien', ''], dtype=object)]
|
18,198 |
nucl-ex/0011001
|
Peter Senger
|
C. Sturm, I. Boettcher, M. Debowski, A. Foerster, E. Grosse, P.
Koczon, B. Kohlmeyer, F. Laue, M. Mang, L. Naumann, H. Oeschler, F.
Puehlhofer, E. Schwab, P. Senger, Y. Shin, J. Speer, H. Stroebele, G.
Surowka, F. Uhlig, A. Wagner, W. Walus
|
Evidence for a Soft Nuclear Equation-of-State from Kaon Production in
Heavy Ion Collisions
|
14 pages, 2 figures, accepted for publication in Phys. Rev. Lett
|
Phys.Rev.Lett.86:39-42,2001
|
10.1103/PhysRevLett.86.39
| null |
nucl-ex
| null |
The production of pions and kaons has been measured in Au+Au collisions at
beam energies from 0.6 to 1.5 AGeV with the Kaon Spectrometer at SIS/GSI. The
K+ meson multiplicity per nucleon is enhanced in Au+Au collisions by factors up
to 6 relative to C+C reactions whereas the corresponding pion ratio is reduced.
The ratio of the K+ meson excitation functions for Au+Au and C+C collisions
increases with decreasing beam energy. This behavior is expected for a soft
nuclear equation-of-state.
|
[{'version': 'v1', 'created': 'Wed, 1 Nov 2000 11:08:43 GMT'}]
|
2008-11-26
|
[array(['Sturm', 'C.', ''], dtype=object)
array(['Boettcher', 'I.', ''], dtype=object)
array(['Debowski', 'M.', ''], dtype=object)
array(['Foerster', 'A.', ''], dtype=object)
array(['Grosse', 'E.', ''], dtype=object)
array(['Koczon', 'P.', ''], dtype=object)
array(['Kohlmeyer', 'B.', ''], dtype=object)
array(['Laue', 'F.', ''], dtype=object)
array(['Mang', 'M.', ''], dtype=object)
array(['Naumann', 'L.', ''], dtype=object)
array(['Oeschler', 'H.', ''], dtype=object)
array(['Puehlhofer', 'F.', ''], dtype=object)
array(['Schwab', 'E.', ''], dtype=object)
array(['Senger', 'P.', ''], dtype=object)
array(['Shin', 'Y.', ''], dtype=object)
array(['Speer', 'J.', ''], dtype=object)
array(['Stroebele', 'H.', ''], dtype=object)
array(['Surowka', 'G.', ''], dtype=object)
array(['Uhlig', 'F.', ''], dtype=object)
array(['Wagner', 'A.', ''], dtype=object)
array(['Walus', 'W.', ''], dtype=object)]
|
18,199 |
1903.04750
|
Wen Zhang
|
Wen Zhang, Bibek Paudel, Wei Zhang, Abraham Bernstein and Huajun Chen
|
Interaction Embeddings for Prediction and Explanation in Knowledge
Graphs
|
This paper is accepted by WSDM2019
| null |
10.1145/3289600.3291014
| null |
cs.AI cs.CL
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Knowledge graph embedding aims to learn distributed representations for
entities and relations, and is proven to be effective in many applications.
Crossover interactions --- bi-directional effects between entities and
relations --- help select related information when predicting a new triple, but
haven't been formally discussed before. In this paper, we propose CrossE, a
novel knowledge graph embedding which explicitly simulates crossover
interactions. It not only learns one general embedding for each entity and
relation as most previous methods do, but also generates multiple triple
specific embeddings for both of them, named interaction embeddings. We evaluate
embeddings on typical link prediction tasks and find that CrossE achieves
state-of-the-art results on complex and more challenging datasets. Furthermore,
we evaluate embeddings from a new perspective --- giving explanations for
predicted triples, which is important for real applications. In this work, an
explanation for a triple is regarded as a reliable closed-path between the head
and the tail entity. Compared to other baselines, we show experimentally that
CrossE, benefiting from interaction embeddings, is more capable of generating
reliable explanations to support its predictions.
|
[{'version': 'v1', 'created': 'Tue, 12 Mar 2019 07:12:46 GMT'}]
|
2019-03-13
|
[array(['Zhang', 'Wen', ''], dtype=object)
array(['Paudel', 'Bibek', ''], dtype=object)
array(['Zhang', 'Wei', ''], dtype=object)
array(['Bernstein', 'Abraham', ''], dtype=object)
array(['Chen', 'Huajun', ''], dtype=object)]
|
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