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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2,000 |
1605.07578
|
Zhe Yu
|
Zhe Yu and Yunjian Xu and Lang Tong
|
Large-scale Charging of Electric Vehicles: A Multi-Armed Bandit Approach
|
13 pages 6 figures
| null |
10.1109/ALLERTON.2015.7447030
| null |
math.OC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The successful launch of electric vehicles (EVs) depends critically on the
availability of convenient and economic charging facilities. The problem of
scheduling of large-scale charging of EVs by a service provider is considered.
A Markov decision process model is introduced in which EVs arrive randomly at a
charging facility with random demand and completion deadlines. The service
provider faces random charging costs, convex non-completion penalties, and a
peak power constraint that limits the maximum number of simultaneous activation
of EV chargers.
Formulated as a restless multi-armed bandit problem, the EV charging problem
is shown to be indexable. A closed-form expression of the Whittle's index is
obtained for the case when the charging costs are constant. The Whittle's index
policy, however, is not optimal in general. An enhancement of the Whittle's
index policy based on spatial interchange according to the less laxity and
longer processing time principle is presented. The proposed policy outperforms
existing charging algorithms, especially when the charging costs are time
varying.
|
[{'version': 'v1', 'created': 'Tue, 24 May 2016 18:36:14 GMT'}]
|
2017-11-09
|
[array(['Yu', 'Zhe', ''], dtype=object)
array(['Xu', 'Yunjian', ''], dtype=object)
array(['Tong', 'Lang', ''], dtype=object)]
|
2,001 |
hep-lat/0310037
|
Poul Damgaard
|
P.H.Damgaard
|
Quenched and Unquenched Chiral Perturbation Theory in the
\epsilon-Regime
|
LaTeX, 7 pages, contribution to LHP2003
| null |
10.1016/S0920-5632(03)02457-5
| null |
hep-lat
| null |
The chiral limit of finite-volume QCD is the $\epsilon$-regime of the theory.
We discuss how this regime can be used for determining low-energy observables
of QCD by means of comparisons between lattice simulations and quenched and
unquenched chiral perturbation theory. The quenched theory suffers in the
$\epsilon$-regime from ``quenched finite volume logs'', the finite-volume
analogs of quenched chiral logs.
|
[{'version': 'v1', 'created': 'Mon, 13 Oct 2003 12:33:31 GMT'}]
|
2016-09-01
|
[array(['Damgaard', 'P. H.', ''], dtype=object)]
|
2,002 |
1202.4043
|
Gabor Pataki
|
Gabor Pataki
|
On the connection of facially exposed and nice cones
| null | null | null | null |
math.OC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A closed convex cone K is called nice, if the set K^* + F^\perp is closed for
all F faces of K, where K^* is the dual cone of K, and F^\perp is the
orthogonal complement of the linear span of F. The niceness property is
important for two reasons: it plays a role in the facial reduction algorithm of
Borwein and Wolkowicz, and the question whether the linear image of a nice cone
is closed also has a simple answer.
We prove several characterizations of nice cones and show a strong connection
with facial exposedness. We prove that a nice cone must be facially exposed; in
reverse, facial exposedness with an added condition implies niceness.
We conjecture that nice, and facially exposed cones are actually the same,
and give supporting evidence.
|
[{'version': 'v1', 'created': 'Sat, 18 Feb 2012 00:21:09 GMT'}
{'version': 'v2', 'created': 'Fri, 24 Feb 2012 22:56:30 GMT'}
{'version': 'v3', 'created': 'Tue, 23 Oct 2012 22:11:59 GMT'}
{'version': 'v4', 'created': 'Tue, 13 Nov 2012 19:30:07 GMT'}]
|
2012-11-14
|
[array(['Pataki', 'Gabor', ''], dtype=object)]
|
2,003 |
1302.2702
|
Aravind Iyengar
|
Aravind R. Iyengar, Paul H. Siegel, and Jack K. Wolf
|
On the Capacity of Channels with Timing Synchronization Errors
|
23 pages, 5 figures, submitted to the IEEE Transactions on
Information Theory, Feb 2013. Summary of some results presented at ISIT 2011
(http://arxiv.org/abs/1106.0070) Revised Feb 2015
| null |
10.1109/TIT.2015.2504358
| null |
cs.IT math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a new formulation of a class of synchronization error channels
and derive analytical bounds and numerical estimates for the capacity of these
channels. For the binary channel with only deletions, we obtain an expression
for the symmetric information rate in terms of subsequence weights which
reduces to a tight lower bound for small deletion probabilities. We are also
able to exactly characterize the Markov-1 rate for the binary channel with only
replications. For a channel that introduces deletions as well as replications
of input symbols, we design approximating channels that parameterize the state
space and show that the information rates of these approximate channels
approach that of the deletion-replication channel as the state space grows. For
the case of the channel where deletions and replications occur with the same
probabilities, a stronger result in the convergence of mutual information rates
is shown. The numerous advantages this new formulation presents are explored.
|
[{'version': 'v1', 'created': 'Tue, 12 Feb 2013 05:21:26 GMT'}
{'version': 'v2', 'created': 'Fri, 2 Oct 2015 07:52:06 GMT'}]
|
2016-11-17
|
[array(['Iyengar', 'Aravind R.', ''], dtype=object)
array(['Siegel', 'Paul H.', ''], dtype=object)
array(['Wolf', 'Jack K.', ''], dtype=object)]
|
2,004 |
1109.5613
|
Hans J. Haubold
|
H.J. Haubold, D. Kumar
|
Analytical results connecting stellar structure parameters and extended
reaction rates
|
20 pages, LaTeX
|
Journal of Astrophysics, Volume 2014, Article ID 656784, 12 pages
|
10.1155/2014/656784
| null |
astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Possible modification in the velocity distribution in the non-resonant
reaction rates leads to an extended reaction rate probability integral. The
closed form representation for these thermonuclear functions are used to obtain
the stellar luminosity and neutrino emission rates. The composite parameter {C}
that determines the standard nuclear reaction rate through the
Maxwell-Boltzmann energy distribution is extended to {C}^* by the extended
reaction rates through a more general distribution than the Maxwell-Boltzmann
distribution. The new distribution is obtained by the pathway model introduced
by Mathai in 2005 [Linear Algebra and Its Applications, 396, 317-328]. Simple
analytic models considered by various authors are utilized for evaluating
stellar luminosity and neutrino emission rates and are obtained in generalized
special functions such as Meijer's G-function and Fox's H-function. The
standard and extended non-resonant thermonuclear functions are compared by
plotting them. Behavior of the new energy distribution, more general than
Maxwell-Boltzmann is also studied.
|
[{'version': 'v1', 'created': 'Fri, 23 Sep 2011 14:26:48 GMT'}]
|
2014-09-09
|
[array(['Haubold', 'H. J.', ''], dtype=object)
array(['Kumar', 'D.', ''], dtype=object)]
|
2,005 |
2005.08279
|
Alexander Patkowski
|
Alexander E Patkowski
|
A Generalized Davenport Expansion
|
Corrected the first version
|
Proceedings of the Edinburgh Mathematical Society, Volume 64,
Issue 3, August 2021, pp. 711--715
|
10.1017/S0013091521000468
| null |
math.NT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We prove a new generalization of Davenport's Fourier expansion of the
infinite series involving the fractional part function over arithmetic
functions. A new Mellin transform related to the Riemann zeta function is also
established.
|
[{'version': 'v1', 'created': 'Sun, 17 May 2020 15:25:55 GMT'}
{'version': 'v2', 'created': 'Wed, 27 May 2020 16:06:51 GMT'}]
|
2021-10-26
|
[array(['Patkowski', 'Alexander E', ''], dtype=object)]
|
2,006 |
nucl-th/9708020
|
Ralf Rapp
|
W. Cassing, E.L. Bratkovskaya, R. Rapp and J. Wambach
|
Probing the Rho Spectral Function in Hot and Dense Nuclear Matter by
Dileptons
|
13 pages RevTeX slightly revised, 6 eps-figures
|
Phys.Rev.C57:916-921,1998
|
10.1103/PhysRevC.57.916
|
SUNY-NTG-97-27, accepted by Phys. Rev. C
|
nucl-th
| null |
We present a dynamical study of $e^+e^-$ and $\mu^+ \mu^-$ production in
proton-nucleus and nucleus-nucleus collisions at CERN-SPS energies on the basis
of the covariant transport approach HSD employing a momentum-dependent
$\rho$-meson spectral function that includes the pion modifications in the
nuclear medium as well as the polarization of the $\rho$-meson due to resonant
$\rho$$-N$ scattering. We find that the experimental data from the CERES and
HELIOS-3 Collaborations can be described equally well as within the dropping
$\rho$-mass scenario. Whereas corresponding dilepton $q_T$-spectra are found to
be very similar, the inclusive dilepton yield in the invariant mass range $0.85
\leq M \leq 1.0$ GeV should allow to disentangle the two scenarios
experimentally.
|
[{'version': 'v1', 'created': 'Tue, 12 Aug 1997 21:09:53 GMT'}
{'version': 'v2', 'created': 'Mon, 3 Nov 1997 16:23:46 GMT'}]
|
2008-11-26
|
[array(['Cassing', 'W.', ''], dtype=object)
array(['Bratkovskaya', 'E. L.', ''], dtype=object)
array(['Rapp', 'R.', ''], dtype=object)
array(['Wambach', 'J.', ''], dtype=object)]
|
2,007 |
1904.06292
|
George Kesidis
|
David J. Miller, Zhen Xiang, and George Kesidis
|
Adversarial Learning in Statistical Classification: A Comprehensive
Review of Defenses Against Attacks
| null |
Proceedings of the IEEE, March. 2020
| null | null |
cs.LG cs.CR stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
There is great potential for damage from adversarial learning (AL) attacks on
machine-learning based systems. In this paper, we provide a contemporary survey
of AL, focused particularly on defenses against attacks on statistical
classifiers. After introducing relevant terminology and the goals and range of
possible knowledge of both attackers and defenders, we survey recent work on
test-time evasion (TTE), data poisoning (DP), and reverse engineering (RE)
attacks and particularly defenses against same. In so doing, we distinguish
robust classification from anomaly detection (AD), unsupervised from
supervised, and statistical hypothesis-based defenses from ones that do not
have an explicit null (no attack) hypothesis; we identify the hyperparameters a
particular method requires, its computational complexity, as well as the
performance measures on which it was evaluated and the obtained quality. We
then dig deeper, providing novel insights that challenge conventional AL wisdom
and that target unresolved issues, including: 1) robust classification versus
AD as a defense strategy; 2) the belief that attack success increases with
attack strength, which ignores susceptibility to AD; 3) small perturbations for
test-time evasion attacks: a fallacy or a requirement?; 4) validity of the
universal assumption that a TTE attacker knows the ground-truth class for the
example to be attacked; 5) black, grey, or white box attacks as the standard
for defense evaluation; 6) susceptibility of query-based RE to an AD defense.
We also discuss attacks on the privacy of training data. We then present
benchmark comparisons of several defenses against TTE, RE, and backdoor DP
attacks on images. The paper concludes with a discussion of future work.
|
[{'version': 'v1', 'created': 'Fri, 12 Apr 2019 16:05:21 GMT'}
{'version': 'v2', 'created': 'Mon, 13 May 2019 17:15:49 GMT'}
{'version': 'v3', 'created': 'Mon, 2 Dec 2019 22:49:28 GMT'}]
|
2020-03-11
|
[array(['Miller', 'David J.', ''], dtype=object)
array(['Xiang', 'Zhen', ''], dtype=object)
array(['Kesidis', 'George', ''], dtype=object)]
|
2,008 |
2201.01531
|
Rebecca Ramjiawan
|
D. R. Bett, N. Blaskovic Kraljevic, T. Bromwich, P. N. Burrows, G. B.
Christian, C. Perry, and R. Ramjiawan
|
A high-resolution, low-latency, bunch-by-bunch feedback system for
nano-beam stabilization
| null | null |
10.1103/PhysRevAccelBeams.25.022801
| null |
physics.acc-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We report the design, operation and performance of a high-resolution,
low-latency, bunch-by-bunch feedback system for nano-beam stabilisation. The
system employs novel, ultra-low quality-factor cavity beam position monitors
(BPMs), a two-stage analogue signal down-mixing system, and a digital signal
processing and feedback board incorporating an FPGA. The FPGA firmware allows
for the real-time integration of up to fifteen samples of the BPM waveforms
within a measured latency of 232 ns. We show that this real-time sample
integration improves significantly the beam position resolution and,
consequently, the feedback performance. The best demonstrated real-time beam
position resolution was 19 nm, which, as far as we are aware, is the best
real-time resolution achieved in any operating BPM system. The feedback was
operated in two complementary modes to stabilise the vertical position of the
ultra-small beam produced at the focal point of the ATF2 beamline at KEK. In
single-BPM feedback mode, beam stabilisation to 50$\pm$5 nm was demonstrated.
In two-BPM feedback mode, beam stabilisation to 41$\pm$4 nm was achieved.
|
[{'version': 'v1', 'created': 'Wed, 5 Jan 2022 10:34:40 GMT'}]
|
2022-03-14
|
[array(['Bett', 'D. R.', ''], dtype=object)
array(['Kraljevic', 'N. Blaskovic', ''], dtype=object)
array(['Bromwich', 'T.', ''], dtype=object)
array(['Burrows', 'P. N.', ''], dtype=object)
array(['Christian', 'G. B.', ''], dtype=object)
array(['Perry', 'C.', ''], dtype=object)
array(['Ramjiawan', 'R.', ''], dtype=object)]
|
2,009 |
2206.14376
|
Hung-Lung Wang
|
Yun-Shan Lu and Hung-Lung Wang
|
A note on the Tuza constant $c_k$ for small $k$
|
5 pages, 1 figure, 2 tables
| null | null | null |
math.CO cs.DM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
For a hypergraph $H$, the transversal is a subset of vertices whose
intersection with every edge is nonempty. The cardinality of a minimum
transversal is the transversal number of $H$, denoted by $\tau(H)$. The Tuza
constant $c_k$ is defined as $\sup{\tau(H)/ (m+n)}$, where $H$ ranges over all
$k$-uniform hypergrpahs, with $m$ and $n$ being the number of edges and
vertices, respectively. We give upper and lower bounds on $c_k$, for $7\leq
k\leq 17$.
|
[{'version': 'v1', 'created': 'Wed, 29 Jun 2022 02:51:25 GMT'}
{'version': 'v2', 'created': 'Mon, 4 Jul 2022 02:28:25 GMT'}]
|
2022-07-05
|
[array(['Lu', 'Yun-Shan', ''], dtype=object)
array(['Wang', 'Hung-Lung', ''], dtype=object)]
|
2,010 |
0712.2224
|
Diego Rodriguez-Gomez
|
I. R. Klebanov, A. Murugan, D. Rodriguez-Gomez, J. Ward
|
Goldstone Bosons and Global Strings in a Warped Resolved Conifold
|
15 pages, no figures
|
JHEP 0805:090,2008
|
10.1088/1126-6708/2008/05/090
|
PUPT-2252, QMUL-PH-07-20
|
hep-th
| null |
A warped resolved conifold background of type IIB theory, constructed in
hep-th/0701064, is dual to the supersymmetric $SU(N)\times SU(N)$ gauge theory
with a vacuum expectation value (VEV) for one of the bifundamental chiral
superfields. This VEV breaks both the superconformal invariance and the
baryonic symmetry. The absolute value of the VEV controls the resolution
parameter of the conifold. In this paper we study the phase of the VEV, which
corresponds to the Goldstone boson of the broken symmetry. We explicitly
construct the linearized perturbation of the 4-form R-R potential that contains
the Goldstone boson. On general grounds, the theory should contain global
strings which create a monodromy of the pseudoscalar Goldstone boson field. We
identify these strings with the $D3$-branes wrapping the two-cycle at the tip
of the warped resolved conifold.
|
[{'version': 'v1', 'created': 'Thu, 13 Dec 2007 19:33:16 GMT'}
{'version': 'v2', 'created': 'Tue, 12 Feb 2008 23:32:06 GMT'}]
|
2009-12-15
|
[array(['Klebanov', 'I. R.', ''], dtype=object)
array(['Murugan', 'A.', ''], dtype=object)
array(['Rodriguez-Gomez', 'D.', ''], dtype=object)
array(['Ward', 'J.', ''], dtype=object)]
|
2,011 |
physics/0510233
|
Gordon Chalmers Dr
|
Gordon Chalmers
|
Symmetry Algebra of IIB Superstring Scattering
|
15 pages, LaTeX, 1 figure
| null | null | null |
physics.gen-ph
| null |
The graviton scattering in IIB superstring theory is examined in the context
of S-duality and symmetry. There is an algebra that generates all of the terms
in the four-point function to any order in derivatives. A map from the algebra
to the scattering is given; it suggests the correctness of the full four-point
function with the S-duality. The higher point functions are expected to follow
a similar pattern.
|
[{'version': 'v1', 'created': 'Wed, 26 Oct 2005 13:46:34 GMT'}]
|
2007-05-23
|
[array(['Chalmers', 'Gordon', ''], dtype=object)]
|
2,012 |
hep-ph/0403286
|
Pavel Fileviez Perez
|
Pavel Fileviez Perez (MPP, Munich & ICTP, Trieste)
|
Fermion mixings vs d=6 proton decay
|
12 pages, two new references, a new equation, and few corrections
|
Phys.Lett.B595:476-483,2004
|
10.1016/j.physletb.2004.06.061
| null |
hep-ph hep-ex
| null |
It is well known, although sometimes ignored, that not only the d=5 but also
d=6 proton decay depends on fermion mixings. In general we study carefully the
dependence of d=6 decay on fermion mixings using the effective operator
approach. We find that without specifying a theory it is impossible to make
clear predictions. Even in a given model, it is often not possible to determine
all the physical parameters. We point out that it is possible to make a clear
test of any grand unified theory with symmetric Yukawa couplings. We discuss in
some detail realistic theories based on SU(5) and SO(10) gauge symmetry.
|
[{'version': 'v1', 'created': 'Mon, 29 Mar 2004 19:55:02 GMT'}
{'version': 'v2', 'created': 'Wed, 14 Apr 2004 10:45:24 GMT'}
{'version': 'v3', 'created': 'Wed, 26 May 2004 15:25:11 GMT'}]
|
2008-11-26
|
[array(['Perez', 'Pavel Fileviez', '', 'MPP, Munich & ICTP, Trieste'],
dtype=object) ]
|
2,013 |
2302.07480
|
Dharmapura Murthy
|
Sujana Chandrappa, Simon Joyson Galbao, P S Sankara Rama Krishnan,
Namitha Anna Koshi, Srewashi Das, Stephen Nagaraju Myakala, Seung Cheol Lee,
Arnab Dutta, Alexey Cherevan, Satadeep Bhattacharjee, Dharmapura H K Murthy
|
Iridium-doping as a strategy to realize visible light absorption and
p-type behavior in BaTiO3
|
21 pages, 8 figures
| null | null | null |
cond-mat.mtrl-sci physics.chem-ph
|
http://creativecommons.org/licenses/by/4.0/
|
BaTiO3 is typically a strong n-type material with tuneable optoelectronic
properties via doping and controlling the synthesis conditions. It has a wide
band gap that can only harness the ultraviolet region of the solar spectrum.
Despite significant progress, achieving visible-light absorbing BTO with
tuneable carrier concentration has been challenging, a crucial requirement for
many applications. In this work, a p-type BTO with visible-light absorption is
realized via iridium doping. Detailed analysis using advanced spectroscopy
tools and computational electronic structure analysis is used to rationalize
the n- to p-type transition after Ir doping. Results offered mechanistic
insight into the interplay between the dopant site occupancy, the dopant
position within the band gap, and the defect chemistry affecting the carrier
concentration. A decrease in the Ti3+ donor levels concentration and the
mutually correlated oxygen vacancies upon Ir doping is attributed to the p-type
behavior. Due to the formation of Ir3+ or Ir4+ in-gap energy levels within the
forbidden region, the optical transition can be elicited from or to such levels
resulting in visible-light absorption. This newly developed Ir-doped BTO can be
a promising p-type perovskite-oxide with imminent applications in solar fuel
generation, spintronics and optoelectronics.
|
[{'version': 'v1', 'created': 'Wed, 15 Feb 2023 05:52:59 GMT'}]
|
2023-02-16
|
[array(['Chandrappa', 'Sujana', ''], dtype=object)
array(['Galbao', 'Simon Joyson', ''], dtype=object)
array(['Krishnan', 'P S Sankara Rama', ''], dtype=object)
array(['Koshi', 'Namitha Anna', ''], dtype=object)
array(['Das', 'Srewashi', ''], dtype=object)
array(['Myakala', 'Stephen Nagaraju', ''], dtype=object)
array(['Lee', 'Seung Cheol', ''], dtype=object)
array(['Dutta', 'Arnab', ''], dtype=object)
array(['Cherevan', 'Alexey', ''], dtype=object)
array(['Bhattacharjee', 'Satadeep', ''], dtype=object)
array(['Murthy', 'Dharmapura H K', ''], dtype=object)]
|
2,014 |
astro-ph/0403701
|
Peter M. Frinchaboy
|
Steven R. Majewski (UVa), William E. Kunkel (LCO), David R. Law (UVa),
Richard J. Patterson (UVa), Allyson A. Polak (UVa), Helio J. Rocha-Pinto
(UVa), Jeffrey D. Crane (UVa), Peter M. Frinchaboy (UVa), Cameron B. Hummels
(UVa), Kathryn V. Johnston (Wesleyan), Jaehyon Rhee (UVa), Michael F.
Skrutskie (UVa), Martin Weinberg (UMass)
|
A Two Micron All-Sky Survey View of the Sagittarius Dwarf Galaxy: II.
Swope Telescope Spectroscopy of M Giant Stars in the Dynamically Cold
Sagittarius Tidal Stream
|
41 pages, 6 figures, Astronomical Journal, in press (submitted Nov.
24, 2003; tentatively scheduled for July 2004 issue)
|
Astrophys.J. 619 (2005) 800-806; Astrophys.J. 619 (2005) 807-823
|
10.1086/421372
| null |
astro-ph
| null |
We present moderate resolution (~6 km/s) spectroscopy of 284 M giant
candidates selected from the Two Micron All Sky Survey photometry. Radial
velocities (RVs) are presented for stars mainly in the south, with a number
having positions consistent with association to the trailing tidal tail of the
Sagittarius (Sgr) dwarf galaxy. The latter show a clear RV trend with orbital
longitude, as expected from models of the orbit and destruction of Sgr. A
minimum 8 kpc width of the trailing stream about the Sgr orbital midplane is
implied by verified RV members. The coldness of this stream (dispersion ~10
km/s) provides upper limits on the combined contributions of stream heating by
a lumpy Galactic halo and the intrinsic dispersion of released stars, which is
a function of the Sgr core mass. The Sgr trailing arm is consistent with a
Galactic halo containing one dominant, LMC-like lump, however some lumpier
halos are not ruled out. An upper limit to the total M/L of the Sgr core is 21
in solar units. A second structure that roughly mimics expectations for
wrapped, leading Sgr arm debris crosses the trailing arm in the Southern
Hemisphere; however, this may also be an unrelated tidal feature. Among the <13
kpc M giants toward the South Galactic Pole are some with large RVs that
identify them as halo stars, perhaps part of the Sgr leading arm near the Sun.
The positions and RVs of Southern Hemisphere M giants are compared with those
of southern globular clusters potentially stripped from the Sgr system and
support for association of Pal 2 and Pal 12 with Sgr debris is found. Our
discussion includes description of a masked-filtered cross-correlation
methodology that achieves better than 1/20 of a resolution element RVs in
moderate resolution spectra.
|
[{'version': 'v1', 'created': 'Wed, 31 Mar 2004 04:58:00 GMT'}]
|
2009-11-10
|
[array(['Majewski', 'Steven R.', '', 'UVa'], dtype=object)
array(['Kunkel', 'William E.', '', 'LCO'], dtype=object)
array(['Law', 'David R.', '', 'UVa'], dtype=object)
array(['Patterson', 'Richard J.', '', 'UVa'], dtype=object)
array(['Polak', 'Allyson A.', '', 'UVa'], dtype=object)
array(['Rocha-Pinto', 'Helio J.', '', 'UVa'], dtype=object)
array(['Crane', 'Jeffrey D.', '', 'UVa'], dtype=object)
array(['Frinchaboy', 'Peter M.', '', 'UVa'], dtype=object)
array(['Hummels', 'Cameron B.', '', 'UVa'], dtype=object)
array(['Johnston', 'Kathryn V.', '', 'Wesleyan'], dtype=object)
array(['Rhee', 'Jaehyon', '', 'UVa'], dtype=object)
array(['Skrutskie', 'Michael F.', '', 'UVa'], dtype=object)
array(['Weinberg', 'Martin', '', 'UMass'], dtype=object)]
|
2,015 |
physics/0602067
|
Rambis Chu
|
James R. Claycomb and Rambis K. Chu
|
Geometrical Dynamics in a Transitioning Superconducting Sphere
|
3 Pages
| null | null | null |
physics.gen-ph
| null |
Recent theoretical work has concentrated on calculating the Casimir effect in
curved spacetime. In this paper we outline the forward problem of metrical
variation due to the Casimir effect for spherical geometries. We consider a
scalar quantum field inside a hollow superconducting sphere. Metric equations
are developed describing the evolution of the scalar curvature after the sphere
transitions to the normal state.
|
[{'version': 'v1', 'created': 'Fri, 10 Feb 2006 00:44:06 GMT'}
{'version': 'v2', 'created': 'Mon, 13 Feb 2006 18:09:24 GMT'}
{'version': 'v3', 'created': 'Wed, 22 Feb 2006 05:32:35 GMT'}]
|
2007-05-23
|
[array(['Claycomb', 'James R.', ''], dtype=object)
array(['Chu', 'Rambis K.', ''], dtype=object)]
|
2,016 |
1910.02595
|
Liu Tonghua
|
Tonghua Liu, Shumin Wu, Shuo Cao
|
The influence of the Earth's curved spacetime on Gaussian quantum
coherence
|
arXiv admin note: substantial text overlap with arXiv:1808.09100
|
Laser Physics Letters (2019)
|
10.1088/1612-202X/ab2be4
|
Laser Physics Letters, Volume 16, Issue 9
|
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Light wave-packets propagating from the Earth to satellites will be deformed
by the curved background spacetime of the Earth, thus influencing the quantum
state of light. We show that Gaussian coherence of photon pairs, which are
initially prepared in a two-mode squeezed state, is affected by the curved
spacetime background of the Earth. We demonstrate that quantum coherence of the
state increases for a specific range of height h and then gradually approaches
a finite value with further increasing height of the satellite's orbit in Kerr
spacetime, because special relativistic effect are involved. Meanwhile, we find
that Gaussian coherence increases with the increase of Gaussian bandwidth
parameter, but the Gaussian coherence decreases with the growth of the peak
frequency. In addition, we also find that total gravitational frequency shift
causes changes of Gaussian coherence less than $%1$ and different initial peak
frequencies also can effect rate of change with the satellite height in
geostationary Earth orbits.
|
[{'version': 'v1', 'created': 'Mon, 7 Oct 2019 03:42:10 GMT'}]
|
2019-10-11
|
[array(['Liu', 'Tonghua', ''], dtype=object)
array(['Wu', 'Shumin', ''], dtype=object)
array(['Cao', 'Shuo', ''], dtype=object)]
|
2,017 |
hep-ph/0404225
|
Antonio Pineda
|
Antonio Pineda
|
Inclusive electromagnetic decays of the heavy quarkonium at next to
leading log accuracy
|
10 pages, 6 figures, Invited talk at the XXVII International
Conference of Theoretical Physics, Ustron, Poland, 15-21 September 2003
|
Acta Phys.Polon. B34 (2003) 5295-5304
| null |
UB-ECM-PF-03-29
|
hep-ph
| null |
We show that perturbation theory may give reasonable numbers for the decays
of the bottomonium and charmonium ground states to $e^+e^-$ and to
$\gamma\gamma$. To reach this conclusion it is important to perform the
resummation of logs. In particular, we obtain the value $\Gamma(\eta_b (1S) \to
\gamma\gamma)=0.35 \pm 0.1 ({\rm th.}) \pm 0.05 (\lQ)$ KeV.
|
[{'version': 'v1', 'created': 'Mon, 26 Apr 2004 07:50:02 GMT'}]
|
2007-05-23
|
[array(['Pineda', 'Antonio', ''], dtype=object)]
|
2,018 |
1304.3705
|
Lindy Blackburn
|
Jordan Camp, Scott D. Barthelmy, Lindy Blackburn, Kenneth Carpenter,
Neil Gehrels, Jonah Kanner, Frank E. Marshall, Judith L. Racusin, Takanori
Sakamoto
|
Using ISS Telescopes for Electromagnetic Follow-up of Gravitational Wave
Detections of NS-NS and NS-BH Mergers
| null | null |
10.1007/s10686-013-9343-4
| null |
gr-qc astro-ph.IM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The International Space Station offers a unique platform for rapid and
inexpensive deployment of space telescopes. A scientific opportunity of great
potential later this decade is the use of telescopes for the electromagnetic
follow-up of ground-based gravitational wave detections of neutron star and
black hole mergers. We describe this possibility for OpTIIX, an ISS technology
demonstration of a 1.5 m diffraction limited optical telescope assembled in
space, and ISS-Lobster, a wide-field imaging X-ray telescope now under study as
a potential NASA mission. Both telescopes will be mounted on pointing
platforms, allowing rapid positioning to the source of a gravitational wave
event. Electromagnetic follow-up rates of several per year appear likely,
offering a wealth of complementary science on the mergers of black holes and
neutron stars.
|
[{'version': 'v1', 'created': 'Fri, 12 Apr 2013 18:53:06 GMT'}]
|
2015-06-15
|
[array(['Camp', 'Jordan', ''], dtype=object)
array(['Barthelmy', 'Scott D.', ''], dtype=object)
array(['Blackburn', 'Lindy', ''], dtype=object)
array(['Carpenter', 'Kenneth', ''], dtype=object)
array(['Gehrels', 'Neil', ''], dtype=object)
array(['Kanner', 'Jonah', ''], dtype=object)
array(['Marshall', 'Frank E.', ''], dtype=object)
array(['Racusin', 'Judith L.', ''], dtype=object)
array(['Sakamoto', 'Takanori', ''], dtype=object)]
|
2,019 |
math/0108174
|
Timo Seppalainen
|
Timo Seppalainen
|
Diffusive fluctuations for one-dimensional totally asymmetric
interacting random dynamics
|
70 pages
|
Comm. Math. Phys. 229 (2002), 141-182 (shortened version)
|
10.1007/s002200200660
| null |
math.PR math-ph math.MP
| null |
We study central limit theorems for a totally asymmetric, one-dimensional
interacting random system. The models we work with are the
Aldous-Diaconis-Hammersley process and the related stick model. The A-D-H
process represents a particle configuration on the line, or a 1-dimensional
interface on the plane which moves in one fixed direction through random local
jumps. The stick model is the process of local slopes of the A-D-H process, and
has a conserved quantity. The results describe the fluctuations of these
systems around the deterministic evolution to which the random system converges
under hydrodynamic scaling. We look at diffusive fluctuations, by which we mean
fluctuations on the scale of the classical central limit theorem. In the
scaling limit these fluctuations obey deterministic equations with random
initial conditions given by the initial fluctuations. Of particular interest is
the effect of macroscopic shocks, which play a dominant role because dynamical
noise is suppressed on the scale we are working.
|
[{'version': 'v1', 'created': 'Fri, 24 Aug 2001 20:17:35 GMT'}]
|
2009-11-07
|
[array(['Seppalainen', 'Timo', ''], dtype=object)]
|
2,020 |
1901.04314
|
Vladimir Dzhunushaliev
|
Vladimir Dzhunushaliev, Vladimir Folomeev, Arislan Makhmudov and Ainur
Urazalina
|
Static general relativistic solutions supported by phantom and ordinary
scalar fields with higher-order potentials
|
10 pages, 5 figures
| null | null | null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Domain wall, wormhole, particlelike, and cosmic string general relativistic
solutions supported by two interacting phantom or ordinary scalar fields with
4th-, 6th-, and 8th-order potentials are studied. Numerical calculations
indicate that regular finite energy solutions exist only for specific values of
two free parameters of the potentials. By solving nonlinear eigenvalue problems
for some fixed sets of values of the free parameters and of boundary
conditions, it is shown that the presence or absence of the solutions depends
on a particular symmetry of the problem, on the type of the scalar fields
(ordinary or phantom), and on the form of the potential.
|
[{'version': 'v1', 'created': 'Fri, 11 Jan 2019 03:20:36 GMT'}]
|
2019-01-15
|
[array(['Dzhunushaliev', 'Vladimir', ''], dtype=object)
array(['Folomeev', 'Vladimir', ''], dtype=object)
array(['Makhmudov', 'Arislan', ''], dtype=object)
array(['Urazalina', 'Ainur', ''], dtype=object)]
|
2,021 |
2006.02291
|
Haowu Wang
|
Haowu Wang
|
The classification of free algebras of orthogonal modular forms
|
Revised version, to appear in Compositio Mathematica
|
Compositio Math. 157 (2021) 2026-2045
|
10.1112/S0010437X21007429
| null |
math.NT math.AG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We prove a necessary and sufficient condition for the graded algebra of
automorphic forms on a symmetric domain of type IV to be free. From the
necessary condition, we derive a classification result. Let $M$ be an even
lattice of signature $(2,n)$ splitting two hyperbolic planes. Suppose $\Gamma$
is a subgroup of the integral orthogonal group of $M$ containing the
discriminant kernel. It is proved that there are exactly 26 groups $\Gamma$
such that the space of modular forms for $\Gamma$ is a free algebra. Using the
sufficient condition, we recover some well-known results.
|
[{'version': 'v1', 'created': 'Wed, 3 Jun 2020 14:20:35 GMT'}
{'version': 'v2', 'created': 'Mon, 28 Jun 2021 13:02:43 GMT'}]
|
2023-06-22
|
[array(['Wang', 'Haowu', ''], dtype=object)]
|
2,022 |
2109.13641
|
Weidong Mei
|
Weidong Mei, Beixiong Zheng, Changsheng You, Rui Zhang
|
Intelligent Reflecting Surface Aided Wireless Networks: From
Single-Reflection to Multi-Reflection Design and Optimization
|
Invited paper. Accepted for publication in the Proceedings of the
IEEE
| null | null | null |
cs.IT eess.SP math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Intelligent reflecting surface (IRS) has emerged as a promising technique for
wireless communication networks. By dynamically tuning the reflection
amplitudes/phase shifts of a large number of passive elements, IRS enables
flexible wireless channel control and configuration, and thereby enhances the
wireless signal transmission rate and reliability significantly. Despite the
vast literature on designing and optimizing assorted IRS-aided wireless
systems, prior works have mainly focused on enhancing wireless links with
single signal reflection only by one or multiple IRSs, which may be
insufficient to boost the wireless link capacity under some harsh propagation
conditions (e.g., indoor environment with dense blockages/obstructions). This
issue can be tackled by employing two or more IRSs to assist each wireless link
and jointly exploiting their single as well as multiple signal reflections over
them. However, the resultant double-/multi-IRS aided wireless systems face more
complex design issues as well as new practical challenges for implementation as
compared to the conventional single-IRS counterpart, in terms of IRS reflection
optimization, channel acquisition, as well as IRS deployment and
association/selection. As such, a new paradigm for designing multi-IRS
cooperative passive beamforming and joint active/passive beam routing arises
which calls for innovative design approaches and optimization methods. In this
paper, we give a tutorial overview of multi-IRS aided wireless networks, with
an emphasis on addressing the new challenges due to multi-IRS signal reflection
and routing. Moreover, we point out important directions worthy of research and
investigation in the future.
|
[{'version': 'v1', 'created': 'Tue, 28 Sep 2021 11:58:59 GMT'}
{'version': 'v2', 'created': 'Mon, 25 Apr 2022 12:54:06 GMT'}]
|
2022-04-26
|
[array(['Mei', 'Weidong', ''], dtype=object)
array(['Zheng', 'Beixiong', ''], dtype=object)
array(['You', 'Changsheng', ''], dtype=object)
array(['Zhang', 'Rui', ''], dtype=object)]
|
2,023 |
1302.2932
|
Francois Fillion-Gourdeau
|
Andr\'e D. Bandrauk, Fran\c{c}ois Fillion-Gourdeau and Emmanuel Lorin
|
Atoms and Molecules in Intense Laser Fields: Gauge Invariance of Theory
and Models
|
43 pages, 5 figures
|
2013 J. Phys. B: At. Mol. Opt. Phys. 46 153001
|
10.1088/0953-4075/46/15/153001
| null |
physics.optics physics.atom-ph quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Gauge invariance was discovered in the development of classical
electromagnetism and was required when the latter was formulated in terms of
the scalar and vector potentials. It is now considered to be a fundamental
principle of nature, stating that different forms of these potentials yield the
same physical description: they describe the same electromagnetic field as long
as they are related to each other by gauge transformations. Gauge invariance
can also be included into the quantum description of matter interacting with an
electromagnetic field by assuming that the wave function transforms under a
given local unitary transformation. The result of this procedure is a quantum
theory describing the coupling of electrons, nuclei and photons. Therefore, it
is a very important concept: it is used in almost every fields of physics and
it has been generalized to describe electroweak and strong interactions in the
standard model of particles. A review of quantum mechanical gauge invariance
and general unitary transformations is presented for atoms and molecules in
interaction with intense short laser pulses, spanning the perturbative to
highly nonlinear nonperturbative interaction regimes. Various unitary
transformations for single spinless particle Time Dependent Schr\"odinger
Equations, TDSE, are shown to correspond to different time-dependent
Hamiltonians and wave functions. Accuracy of approximation methods involved in
solutions of TDSE's such as perturbation theory and popular numerical methods
depend on gauge or representation choices which can be more convenient due to
faster convergence criteria. We focus on three main representations: length and
velocity gauges, in addition to the acceleration form which is not a gauge, to
describe perturbative and nonperturbative radiative interactions. Numerical
schemes for solving TDSE's in different representations are also discussed.
|
[{'version': 'v1', 'created': 'Tue, 12 Feb 2013 21:40:18 GMT'}]
|
2013-08-06
|
[array(['Bandrauk', 'André D.', ''], dtype=object)
array(['Fillion-Gourdeau', 'François', ''], dtype=object)
array(['Lorin', 'Emmanuel', ''], dtype=object)]
|
2,024 |
1705.10119
|
Jiaxin Shi
|
Jiaxin Shi, Shengyang Sun, Jun Zhu
|
Kernel Implicit Variational Inference
|
Published as a conference paper at ICLR 2018
| null | null | null |
stat.ML cs.AI cs.LG cs.NE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent progress in variational inference has paid much attention to the
flexibility of variational posteriors. One promising direction is to use
implicit distributions, i.e., distributions without tractable densities as the
variational posterior. However, existing methods on implicit posteriors still
face challenges of noisy estimation and computational infeasibility when
applied to models with high-dimensional latent variables. In this paper, we
present a new approach named Kernel Implicit Variational Inference that
addresses these challenges. As far as we know, for the first time implicit
variational inference is successfully applied to Bayesian neural networks,
which shows promising results on both regression and classification tasks.
|
[{'version': 'v1', 'created': 'Mon, 29 May 2017 11:11:35 GMT'}
{'version': 'v2', 'created': 'Thu, 22 Feb 2018 13:49:00 GMT'}
{'version': 'v3', 'created': 'Fri, 23 Feb 2018 15:45:59 GMT'}]
|
2018-02-26
|
[array(['Shi', 'Jiaxin', ''], dtype=object)
array(['Sun', 'Shengyang', ''], dtype=object)
array(['Zhu', 'Jun', ''], dtype=object)]
|
2,025 |
2111.00263
|
Jennifer Cooper
|
Jennifer R. Cooper, Gregory H. Rudnick, Gabriel G. Brammer, Tyler
Desjardins, Justin L. Mann, Benjamin J. Weiner, Alfonso Arag\'on-Salamanca,
Gabriella De Lucia, Vandana Desai, Rose A. Finn, Pascale Jablonka, Yara L.
Jaff\'e, John Moustakas, Damien Sp\'erone-Longin, Harry I. Teplitz, Benedetta
Vulcani and Dennis Zaritsky
|
H$\alpha$-based Star Formation Rates in and around z $\sim$ 0.5 EDisCS
clusters
|
25 pages, 15 figures, 5 tables. Accepted for publication in Monthly
Notices of the Royal Astronomical Society
| null |
10.1093/mnras/stab3184
| null |
astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the role of environment on star-formation rates of galaxies at
various cosmic densities in well-studied clusters. We present the star-forming
main sequence for 163 galaxies in four EDisCS clusters in the range 0.4 $<$ z
$<$ 0.7. We use {\em Hubble Space Telescope}/Wide Field Camera 3 observations
of the H$\alpha$ emission line to span three distinct local environments: the
cluster core, infall region, and external field galaxies. The main sequence
defined from our observations is consistent with other published H$\alpha$
distributions at similar redshifts, but differs from those derived from
star-formation tracers such as 24$\mu$m. We find that the H$\alpha$-derived
star-formation rates for the 67 galaxies with stellar masses greater than the
mass-completeness limit of M$_*>$ 10$^{9.75}$M\textsubscript{\(\odot\)} show
little dependence on environment. At face value, the similarities in the
star-formation rate distributions in the three environments may indicate that
the process of finally shutting down star formation is rapid, however, the
depth of our data and size of our sample make it difficult to conclusively test
this scenario. Despite having significant H$\alpha$ emission, 21 galaxies are
classified as {\em UVJ}-quiescent and may represent a demonstration of the
quenching of star formation caught in the act.
|
[{'version': 'v1', 'created': 'Sat, 30 Oct 2021 14:49:27 GMT'}]
|
2021-11-17
|
[array(['Cooper', 'Jennifer R.', ''], dtype=object)
array(['Rudnick', 'Gregory H.', ''], dtype=object)
array(['Brammer', 'Gabriel G.', ''], dtype=object)
array(['Desjardins', 'Tyler', ''], dtype=object)
array(['Mann', 'Justin L.', ''], dtype=object)
array(['Weiner', 'Benjamin J.', ''], dtype=object)
array(['Aragón-Salamanca', 'Alfonso', ''], dtype=object)
array(['De Lucia', 'Gabriella', ''], dtype=object)
array(['Desai', 'Vandana', ''], dtype=object)
array(['Finn', 'Rose A.', ''], dtype=object)
array(['Jablonka', 'Pascale', ''], dtype=object)
array(['Jaffé', 'Yara L.', ''], dtype=object)
array(['Moustakas', 'John', ''], dtype=object)
array(['Spérone-Longin', 'Damien', ''], dtype=object)
array(['Teplitz', 'Harry I.', ''], dtype=object)
array(['Vulcani', 'Benedetta', ''], dtype=object)
array(['Zaritsky', 'Dennis', ''], dtype=object)]
|
2,026 |
1804.09770
|
Namita Lokare
|
Namita Lokare, Jorge Silva, Ilknur Kaynar Kabul
|
RULLS: Randomized Union of Locally Linear Subspaces for Feature
Engineering
|
9 pages
| null | null | null |
cs.LG stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Feature engineering plays an important role in the success of a machine
learning model. Most of the effort in training a model goes into data
preparation and choosing the right representation. In this paper, we propose a
robust feature engineering method, Randomized Union of Locally Linear Subspaces
(RULLS). We generate sparse, non-negative, and rotation invariant features in
an unsupervised fashion. RULLS aggregates features from a random union of
subspaces by describing each point using globally chosen landmarks. These
landmarks serve as anchor points for choosing subspaces. Our method provides a
way to select features that are relevant in the neighborhood around these
chosen landmarks. Distances from each data point to $k$ closest landmarks are
encoded in the feature matrix. The final feature representation is a union of
features from all chosen subspaces.
The effectiveness of our algorithm is shown on various real-world datasets
for tasks such as clustering and classification of raw data and in the presence
of noise. We compare our method with existing feature generation methods.
Results show a high performance of our method on both classification and
clustering tasks.
|
[{'version': 'v1', 'created': 'Wed, 25 Apr 2018 19:37:55 GMT'}]
|
2018-04-27
|
[array(['Lokare', 'Namita', ''], dtype=object)
array(['Silva', 'Jorge', ''], dtype=object)
array(['Kabul', 'Ilknur Kaynar', ''], dtype=object)]
|
2,027 |
2209.04021
|
Ivan Arzhantsev
|
Ivan Arzhantsev, Alexander Perepechko, and Kirill Shakhmatov
|
Radiant toric varieties and unipotent group actions
|
24 pages
| null | null | null |
math.AG
|
http://creativecommons.org/licenses/by/4.0/
|
We consider complete toric varieties $X$ such that a maximal unipotent
subgroup $U$ of the automorphism group $\text{Aut}(X)$ acts on $X$ with an open
orbit. It turns out that such varieties can be characterized by several
remarkable properties. We study the set of Demazure roots of the corresponding
complete fan, describe the structure of a maximal unipotent subgroup $U$ in
$\text{Aut}(X)$, and find all regular subgroups in $U$ that act on $X$ with an
open orbit.
|
[{'version': 'v1', 'created': 'Thu, 8 Sep 2022 20:15:13 GMT'}]
|
2022-09-12
|
[array(['Arzhantsev', 'Ivan', ''], dtype=object)
array(['Perepechko', 'Alexander', ''], dtype=object)
array(['Shakhmatov', 'Kirill', ''], dtype=object)]
|
2,028 |
2212.01103
|
Zutao Jiang
|
Zutao Jiang, Guangsong Lu, Xiaodan Liang, Jihua Zhu, Wei Zhang,
Xiaojun Chang, Hang Xu
|
3D-TOGO: Towards Text-Guided Cross-Category 3D Object Generation
| null |
AAAI 2023
| null | null |
cs.CV cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Text-guided 3D object generation aims to generate 3D objects described by
user-defined captions, which paves a flexible way to visualize what we
imagined. Although some works have been devoted to solving this challenging
task, these works either utilize some explicit 3D representations (e.g., mesh),
which lack texture and require post-processing for rendering photo-realistic
views; or require individual time-consuming optimization for every single case.
Here, we make the first attempt to achieve generic text-guided cross-category
3D object generation via a new 3D-TOGO model, which integrates a text-to-views
generation module and a views-to-3D generation module. The text-to-views
generation module is designed to generate different views of the target 3D
object given an input caption. prior-guidance, caption-guidance and view
contrastive learning are proposed for achieving better view-consistency and
caption similarity. Meanwhile, a pixelNeRF model is adopted for the views-to-3D
generation module to obtain the implicit 3D neural representation from the
previously-generated views. Our 3D-TOGO model generates 3D objects in the form
of the neural radiance field with good texture and requires no time-cost
optimization for every single caption. Besides, 3D-TOGO can control the
category, color and shape of generated 3D objects with the input caption.
Extensive experiments on the largest 3D object dataset (i.e., ABO) are
conducted to verify that 3D-TOGO can better generate high-quality 3D objects
according to the input captions across 98 different categories, in terms of
PSNR, SSIM, LPIPS and CLIP-score, compared with text-NeRF and Dreamfields.
|
[{'version': 'v1', 'created': 'Fri, 2 Dec 2022 11:31:49 GMT'}]
|
2022-12-05
|
[array(['Jiang', 'Zutao', ''], dtype=object)
array(['Lu', 'Guangsong', ''], dtype=object)
array(['Liang', 'Xiaodan', ''], dtype=object)
array(['Zhu', 'Jihua', ''], dtype=object)
array(['Zhang', 'Wei', ''], dtype=object)
array(['Chang', 'Xiaojun', ''], dtype=object)
array(['Xu', 'Hang', ''], dtype=object)]
|
2,029 |
2110.05687
|
Qichao Ying
|
Qichao Ying, Xiaoxiao Hu, Xiangyu Zhang, Zhenxing Qian and Xinpeng
Zhang
|
RWN: Robust Watermarking Network for Image Cropping Localization
| null | null | null | null |
cs.CV cs.AI
|
http://creativecommons.org/licenses/by/4.0/
|
Image cropping can be maliciously used to manipulate the layout of an image
and alter the underlying meaning. Previous image crop detection schemes only
predicts whether an image has been cropped, ignoring which part of the image is
cropped. This paper presents a novel robust watermarking network (RWN) for
image crop localization. We train an anti-crop processor (ACP) that embeds a
watermark into a target image. The visually indistinguishable protected image
is then posted on the social network instead of the original image. At the
recipient's side, ACP extracts the watermark from the attacked image, and we
conduct feature matching on the original and extracted watermark to locate the
position of the crop in the original image plane. We further extend our scheme
to detect tampering attack on the attacked image. Besides, we explore a simple
yet efficient method (JPEG-Mixup) to improve the generalization of JPEG
robustness. According to our comprehensive experiments, RWN is the first to
provide high-accuracy and robust image crop localization. Besides, the accuracy
of tamper detection is comparable with many state-of-the-art passive-based
methods.
|
[{'version': 'v1', 'created': 'Tue, 12 Oct 2021 02:19:42 GMT'}
{'version': 'v2', 'created': 'Tue, 31 May 2022 14:57:39 GMT'}]
|
2022-06-01
|
[array(['Ying', 'Qichao', ''], dtype=object)
array(['Hu', 'Xiaoxiao', ''], dtype=object)
array(['Zhang', 'Xiangyu', ''], dtype=object)
array(['Qian', 'Zhenxing', ''], dtype=object)
array(['Zhang', 'Xinpeng', ''], dtype=object)]
|
2,030 |
1011.2089
|
Marco Forti
|
Andreas Blass, Mauro Di Nasso, and Marco Forti
|
Quasi-selective ultrafilters and asymptotic numerosities
|
27 pages
|
Adv. Math. 231 (2012), 1462-1486
| null | null |
math.LO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We isolate a new class of ultrafilters on N, called "quasi-selective" because
they are intermediate between selective ultrafilters and P-points. (Under the
Continuum Hypothesis these three classes are distinct.) The existence of
quasi-selective ultrafilters is equivalent to the existence of "asymptotic
numerosities" for all sets of tuples of natural numbers. Such numerosities are
hypernatural numbers that generalize finite cardinalities to countable point
sets. Most notably, they maintain the structure of ordered semiring, and, in a
precise sense, they allow for a natural extension of asymptotic density to all
sequences of tuples of natural numbers.
|
[{'version': 'v1', 'created': 'Tue, 9 Nov 2010 13:59:49 GMT'}
{'version': 'v2', 'created': 'Wed, 8 Jun 2011 13:03:28 GMT'}]
|
2017-12-19
|
[array(['Blass', 'Andreas', ''], dtype=object)
array(['Di Nasso', 'Mauro', ''], dtype=object)
array(['Forti', 'Marco', ''], dtype=object)]
|
2,031 |
1908.09264
|
Samah Khawaled
|
Samah Khawaled, Michael Zibulevsky and Yehoshua Y. Zeevi
|
Texture and Structure Two-view Classification of Images
| null | null | null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Textural and structural features can be regraded as "two-view" feature sets.
Inspired by the recent progress in multi-view learning, we propose a novel
two-view classification method that models each feature set and optimizes the
process of merging these views efficiently. Examples of implementation of this
approach in classification of real-world data are presented, with special
emphasis on medical images. We firstly decompose fully-textured images into two
layers of representation, corresponding to natural stochastic textures (NST)
and structural layer, respectively. The structural, edge-and-curve-type,
information is mostly represented by the local spatial phase, whereas, the pure
NST has random phase and is characterized by Gaussianity and self-similarity.
Therefore, the NST is modeled by the 2D self-similar process, fractional
Brownian motion (fBm). The Hurst parameter, characteristic of fBm, specifies
the roughness or irregularity of the texture. This leads us to its estimation
and implementation along other features extracted from the structure layer, to
build the "two-view" features sets used in our classification scheme. A shallow
neural net (NN) is exploited to execute the process of merging these feature
sets, in a straightforward and efficient manner.
|
[{'version': 'v1', 'created': 'Sun, 25 Aug 2019 07:13:25 GMT'}]
|
2019-08-27
|
[array(['Khawaled', 'Samah', ''], dtype=object)
array(['Zibulevsky', 'Michael', ''], dtype=object)
array(['Zeevi', 'Yehoshua Y.', ''], dtype=object)]
|
2,032 |
1205.0680
|
Lutz Bornmann Dr.
|
Lutz Bornmann and Loet Leydesdorff
|
Citation impact of papers published from six prolific countries: A
national comparison based on InCites data
|
14 pages
| null | null | null |
cs.DL stat.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using the InCites tool of Thomson Reuters, this study compares normalized
citation impact values calculated for China, Japan, France, Germany, United
States, and the UK throughout the time period from 1981 to 2010. The citation
impact values are normalized to four subject areas: natural sciences;
engineering and technology; medical and health sciences; and agricultural
sciences. The results show an increasing trend in citation impact values for
France, the UK and especially for Germany across the last thirty years in all
subject areas. The citation impact of papers from China is still at a
relatively low level (mostly below the world average), but the country follows
an increasing trend line. The USA exhibits a relatively stable pattern of high
citation impact values across the years. With small impact differences between
the publication years, the US trend is increasing in engineering and technology
but decreasing in medical and health sciences as well as in agricultural
sciences. Similar to the USA, Japan follows increasing as well as decreasing
trends in different subject areas, but the variability across the years is
small. In most of the years, papers from Japan perform below or approximately
at the world average in each subject area.
|
[{'version': 'v1', 'created': 'Thu, 3 May 2012 11:40:56 GMT'}]
|
2012-05-04
|
[array(['Bornmann', 'Lutz', ''], dtype=object)
array(['Leydesdorff', 'Loet', ''], dtype=object)]
|
2,033 |
0708.2278
|
Rebecca F. Goldin
|
Rebecca F. Goldin
|
Weighted hyperprojective spaces and homotopy invariance in orbifold
cohomology
|
11 pages. To appear in AMS Contemporary Mathematics (Proceedings of
the Toric Topology Conference, Osaka, Japan (May-June, 2006))
|
Toric topology, 99--110, Contemp. Math., 460, Amer. Math. Soc.,
Providence, RI, 2008.
| null | null |
math.SG math.DG
| null |
We show that Chen-Ruan cohomology is a homotopy invariant in certain cases.
We introduce the notion of a T-representation homotopy, which is a stringent
form of homotopy under which Chen-Ruan cohomology is invariant. We show that
while hyperkahler quotients of the cotangent bundle to a complex vector space
by a circle S^1 (here termed weighted hyperprojective spaces) are homotopy
equivalent to weighted projective spaces, they are not S^1-representation
homotopic. Indeed, we show that their Chen-Ruan cohomology rings (over the
rationals) are distinct.
|
[{'version': 'v1', 'created': 'Thu, 16 Aug 2007 20:18:21 GMT'}]
|
2009-09-10
|
[array(['Goldin', 'Rebecca F.', ''], dtype=object)]
|
2,034 |
2206.05252
|
Trenton Chang
|
Trenton Chang and Daniel Y. Fu
|
Lost in Transmission: On the Impact of Networking Corruptions on Video
Machine Learning Models
|
12 pages, 12 figures (with supplemental: 34 pages)
| null | null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study how networking corruptions--data corruptions caused by networking
errors--affect video machine learning (ML) models. We discover apparent
networking corruptions in Kinetics-400, a benchmark video ML dataset. In a
simulation study, we investigate (1) what artifacts networking corruptions
cause, (2) how such artifacts affect ML models, and (3) whether standard
robustness methods can mitigate their negative effects. We find that networking
corruptions cause visual and temporal artifacts (i.e., smeared colors or frame
drops). These networking corruptions degrade performance on a variety of video
ML tasks, but effects vary by task and dataset, depending on how much temporal
context the tasks require. Lastly, we evaluate data augmentation--a standard
defense for data corruptions--but find that it does not recover performance.
|
[{'version': 'v1', 'created': 'Fri, 10 Jun 2022 17:50:50 GMT'}]
|
2022-06-13
|
[array(['Chang', 'Trenton', ''], dtype=object)
array(['Fu', 'Daniel Y.', ''], dtype=object)]
|
2,035 |
2006.10223
|
Seth D Brown
|
Seth Brown, Wenxin Zhang, Temitayo Ajayi, Andrew Schaefer
|
A Gilmore-Gomory-Type Construction of Integer Programming Value
Functions
| null | null | null | null |
math.OC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we analyze how sequentially introducing decision variables
into an integer program (IP) affects the value function and its level sets. We
use a Gilmore-Gomory approach to find parametrized IP value functions over a
restricted set of variables. We introduce the notion of maximal connected
subsets of level sets - volumes in which changes to the constraint right-hand
side have no effect on the value function - and relate these structures to IP
value functions and optimal solutions.
|
[{'version': 'v1', 'created': 'Thu, 18 Jun 2020 01:18:22 GMT'}
{'version': 'v2', 'created': 'Tue, 2 Feb 2021 03:01:30 GMT'}]
|
2021-02-03
|
[array(['Brown', 'Seth', ''], dtype=object)
array(['Zhang', 'Wenxin', ''], dtype=object)
array(['Ajayi', 'Temitayo', ''], dtype=object)
array(['Schaefer', 'Andrew', ''], dtype=object)]
|
2,036 |
2006.02629
|
Dong Li Dr.
|
Dong Li, Ding Yuan, Marcel Goossens, Tom Van Doorsselaere, Wei Su, Ya
Wang, Yang Su, and Zongjun Ning
|
An ultra-long and quite thin coronal loop without significant expansion
|
8 pages, 5 figures, 1 tables
|
A&A 639, A114 (2020)
|
10.1051/0004-6361/202038433
| null |
astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Context. Coronal loops are the basic building blocks of the solar corona,
which are related to the mass supply and heating of solar plasmas in the
corona. However, their fundamental magnetic structures are still not well
understood. Most coronal loops do not expand significantly, whereas the
diverging magnetic field would have an expansion factor of about 5-10 over one
pressure scale height. Aims. In this study, we investigate a unique coronal
loop with a roughly constant cross section, it is ultra long and quite thin. A
coronal loop model with magnetic helicity is presented to explain the small
expansion of the loop width. Methods. This coronal loop was predominantly
detectable in the 171 A channel of the Atmospheric Imaging Assembly (AIA).
Then, the local magnetic field line was extrapolated by a
Potential-Field-Source-Surface model. Finally, the differential emission
measure analysis made from six AIA bandpasses was applied to obtain the thermal
properties of this loop. Results. This coronal loop has a projected length of
roughly 130 Mm, a width of about 1.5 +(-) 0.5 Mm and a lifetime of around 90
minutes. It follows an open magnetic field line. The cross section expanded
very little (i.e., 1.5-2.0) along the loop length during its whole lifetime.
This loop has a nearly constant temperature at about 0.7 +(-) 0.2 MK, whereas
its density exhibits the typical structure of a stratified atmosphere.
Conclusions. We use a thin twisted flux tube theory to construct a model for
this non-expanding loop, and find that indeed with sufficient twist a coronal
loop can attain equilibrium. However, we can not rule out other possibilities
such as footpoint heating by small-scale reconnection, elevated scale height by
a steady flow along the loop etc.
|
[{'version': 'v1', 'created': 'Thu, 4 Jun 2020 03:33:25 GMT'}]
|
2020-07-22
|
[array(['Li', 'Dong', ''], dtype=object)
array(['Yuan', 'Ding', ''], dtype=object)
array(['Goossens', 'Marcel', ''], dtype=object)
array(['Van Doorsselaere', 'Tom', ''], dtype=object)
array(['Su', 'Wei', ''], dtype=object)
array(['Wang', 'Ya', ''], dtype=object)
array(['Su', 'Yang', ''], dtype=object)
array(['Ning', 'Zongjun', ''], dtype=object)]
|
2,037 |
0909.4381
|
Nils Carqueville
|
Nils Carqueville, Ingo Runkel
|
On the monoidal structure of matrix bi-factorisations
|
43 pages; v2: corrected a mistake in sec. 1 and app. A.1, the results
are unaffected; v3: minor changes
|
J.Phys.A43:275401,2010
|
10.1088/1751-8113/43/27/275401
|
KCL-MTH-09-11
|
math-ph hep-th math.MP math.QA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate tensor products of matrix factorisations. This is most
naturally done by formulating matrix factorisations in terms of bimodules
instead of modules. If the underlying ring is C[x_1,...,x_N] we show that
bimodule matrix factorisations form a monoidal category.
This monoidal category has a physical interpretation in terms of defect lines
in a two-dimensional Landau-Ginzburg model. There is a dual description via
conformal field theory, which in the special case of W=x^d is an N=2 minimal
model, and which also gives rise to a monoidal category describing defect
lines. We carry out a comparison of these two categories in certain subsectors
by explicitly computing 6j-symbols.
|
[{'version': 'v1', 'created': 'Thu, 24 Sep 2009 08:02:11 GMT'}
{'version': 'v2', 'created': 'Sun, 1 Nov 2009 18:17:58 GMT'}
{'version': 'v3', 'created': 'Sat, 12 Jun 2010 16:06:01 GMT'}]
|
2014-11-20
|
[array(['Carqueville', 'Nils', ''], dtype=object)
array(['Runkel', 'Ingo', ''], dtype=object)]
|
2,038 |
0712.0906
|
Miriam Giorgini
|
Giorgio Giacomelli (Dipartimento di Fisica dell'Universita' di Bologna
and INFN Sezione di Bologna)
|
Rising Total Hadron-Hadron Cross Sections
|
10 pages, 7 eps figures. Talk given in honour of George T. Zatsepin
| null | null | null |
hep-ex
| null |
A historical summary is made on the measurements concerning the rising total
hadron-hadron cross sections at high energies. The first part of this paper
concerns the total cross section measurements performed at the Brookhaven,
Serpukhov and Fermilab fixed target accelerators; then the measurements at the
CERN Intersecting Storage Rings (ISR), and at the CERN and at the Tevatron
Fermilab proton-antiproton colliders; finally the cosmic ray measurements at
even higher energies. A short discussion on Conclusions and Perspectives
follows.
|
[{'version': 'v1', 'created': 'Thu, 6 Dec 2007 10:53:24 GMT'}]
|
2007-12-07
|
[array(['Giacomelli', 'Giorgio', '',
"Dipartimento di Fisica dell'Universita' di Bologna\n and INFN Sezione di Bologna"],
dtype=object) ]
|
2,039 |
2212.06881
|
Markus Haltmeier
|
Andrea Ebner and Markus Haltmeier
|
Plug-and-Play image reconstruction is a convergent regularization method
| null | null | null | null |
math.NA cs.NA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Non-uniqueness and instability are characteristic features of image
reconstruction processes. As a result, it is necessary to develop
regularization methods that can be used to compute reliable approximate
solutions. A regularization method provides of a family of stable
reconstructions that converge to an exact solution of the noise-free problem as
the noise level tends to zero. The standard regularization technique is defined
by variational image reconstruction, which minimizes a data discrepancy
augmented by a regularizer. The actual numerical implementation makes use of
iterative methods, often involving proximal mappings of the regularizer. In
recent years, Plug-and-Play image reconstruction (PnP) has been developed as a
new powerful generalization of variational methods based on replacing proximal
mappings by more general image denoisers. While PnP iterations yield excellent
results, neither stability nor convergence in the sense of regularization has
been studied so far. In this work, we extend the idea of PnP by considering
families of PnP iterations, each being accompanied by its own denoiser. As our
main theoretical result, we show that such PnP reconstructions lead to stable
and convergent regularization methods. This shows for the first time that PnP
is mathematically equally justified for robust image reconstruction as
variational methods
|
[{'version': 'v1', 'created': 'Tue, 13 Dec 2022 20:07:13 GMT'}
{'version': 'v2', 'created': 'Thu, 15 Dec 2022 11:47:50 GMT'}]
|
2022-12-16
|
[array(['Ebner', 'Andrea', ''], dtype=object)
array(['Haltmeier', 'Markus', ''], dtype=object)]
|
2,040 |
1301.1357
|
Xingkun Man
|
Xingkun Man, Kris T. Delaney, Michael C. Villet, Henri Orland, and
Glenn H. Fredrickson
|
Coherent States Formulation of Polymer Field Theory
|
14pages 8 figures
|
Journal of Chemical Physics, 140, 024905(2014)
|
10.1063/1.4860978
| null |
cond-mat.soft
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce a stable and efficient complex Langevin (CL) scheme to enable
the first numerical simulations of the coherent-states (CS) formulation of
polymer field theory. In contrast with Edwards' well known auxiliary-field (AF)
framework, the CS formulation does not contain an embedded non-linear,
non-local functional of the auxiliary fields, and the action of the field
theory has a fully explicit, finite-order and semi-local polynomial character.
In the context of a polymer solution model, we demonstrate that the new CS-CL
dynamical scheme for sampling fluctuations in the space of coherent states
yields results in good agreement with now-standard AF simulations. The
formalism is potentially applicable to a broad range of polymer architectures
and may facilitate systematic generation of trial actions for use in
coarse-graining and numerical renormalization-group studies.
|
[{'version': 'v1', 'created': 'Mon, 7 Jan 2013 21:47:47 GMT'}
{'version': 'v2', 'created': 'Mon, 21 Oct 2013 03:06:04 GMT'}]
|
2016-02-18
|
[array(['Man', 'Xingkun', ''], dtype=object)
array(['Delaney', 'Kris T.', ''], dtype=object)
array(['Villet', 'Michael C.', ''], dtype=object)
array(['Orland', 'Henri', ''], dtype=object)
array(['Fredrickson', 'Glenn H.', ''], dtype=object)]
|
2,041 |
hep-ph/9507342
|
Pene
|
A. Le Yaouanc, L. Oliver, O. P\`ene and J.-C. Raynal
|
Covariant quark model of form factors in the heavy mass limit
|
16 pages
|
Phys.Lett. B365 (1996) 319-326
|
10.1016/0370-2693(95)01285-0
|
LPTHE-Orsay 95/52
|
hep-ph
| null |
We show that quark models of current matrix-elements based on the
Bakamjian-Thomas construction of relativistic states with a fixed number of
particles, plus the additivity assumption, are covariant in the heavy-quark
limit and satisfy the full set of heavy-quark symmetry relations discovered by
Isgur and Wise. We find the lower bound of $\rho^2$ in such models to be $3/4$
for ground state mesons, independently of any parameter. Another welcome
property of these models is that in the infinite momentum limit the wave
functions vanish outside the domain $0\le x \le 1$.
|
[{'version': 'v1', 'created': 'Wed, 19 Jul 1995 10:03:15 GMT'}]
|
2009-10-28
|
[array(['Yaouanc', 'A. Le', ''], dtype=object)
array(['Oliver', 'L.', ''], dtype=object)
array(['Pène', 'O.', ''], dtype=object)
array(['Raynal', 'J. -C.', ''], dtype=object)]
|
2,042 |
0801.2431
|
Edmund Bertschinger
|
Edmund Bertschinger and Phillip Zukin
|
Distinguishing Modified Gravity from Dark Energy
|
Accepted by PRD
|
Phys.Rev.D78:024015,2008
|
10.1103/PhysRevD.78.024015
| null |
astro-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The acceleration of the universe can be explained either through dark energy
or through the modification of gravity on large scales. In this paper we
investigate modified gravity models and compare their observable predictions
with dark energy models. Modifications of general relativity are expected to be
scale-independent on super-horizon scales and scale-dependent on sub-horizon
scales. For scale-independent modifications, utilizing the conservation of the
curvature scalar and a parameterized post-Newtonian formulation of cosmological
perturbations, we derive results for large scale structure growth, weak
gravitational lensing, and cosmic microwave background anisotropy. For
scale-dependent modifications, inspired by recent $f(R)$ theories we introduce
a parameterization for the gravitational coupling $G$ and the post-Newtonian
parameter $\gamma$. These parameterizations provide a convenient formalism for
testing general relativity. However, we find that if dark energy is generalized
to include both entropy and shear stress perturbations, and the dynamics of
dark energy is unknown a priori, then modified gravity cannot in general be
distinguished from dark energy using cosmological linear perturbations.
|
[{'version': 'v1', 'created': 'Wed, 16 Jan 2008 17:06:28 GMT'}
{'version': 'v2', 'created': 'Fri, 13 Jun 2008 13:57:41 GMT'}]
|
2008-11-26
|
[array(['Bertschinger', 'Edmund', ''], dtype=object)
array(['Zukin', 'Phillip', ''], dtype=object)]
|
2,043 |
2011.05142
|
Qingyu Chen
|
Qingyu Chen, Tiarnan D. L. Keenan, Alexis Allot, Yifan Peng, Elvira
Agr\'on, Amitha Domalpally, Caroline C. W. Klaver, Daniel T. Luttikhuizen,
Marcus H. Colyer, Catherine A. Cukras, Henry E. Wiley, M. Teresa Magone,
Chantal Cousineau-Krieger, Wai T. Wong, Yingying Zhu, Emily Y. Chew, Zhiyong
Lu (for the AREDS2 Deep Learning Research Group)
|
Multi-modal, multi-task, multi-attention (M3) deep learning detection of
reticular pseudodrusen: towards automated and accessible classification of
age-related macular degeneration
|
5 figures and 4 tables, To appear in Journal of the American Medical
Informatics Association
| null | null | null |
cs.CV cs.AI cs.LG eess.IV
|
http://creativecommons.org/licenses/by/4.0/
|
Objective Reticular pseudodrusen (RPD), a key feature of age-related macular
degeneration (AMD), are poorly detected by human experts on standard color
fundus photography (CFP) and typically require advanced imaging modalities such
as fundus autofluorescence (FAF). The objective was to develop and evaluate the
performance of a novel 'M3' deep learning framework on RPD detection. Materials
and Methods A deep learning framework M3 was developed to detect RPD presence
accurately using CFP alone, FAF alone, or both, employing >8000 CFP-FAF image
pairs obtained prospectively (Age-Related Eye Disease Study 2). The M3
framework includes multi-modal (detection from single or multiple image
modalities), multi-task (training different tasks simultaneously to improve
generalizability), and multi-attention (improving ensembled feature
representation) operation. Performance on RPD detection was compared with
state-of-the-art deep learning models and 13 ophthalmologists; performance on
detection of two other AMD features (geographic atrophy and pigmentary
abnormalities) was also evaluated. Results For RPD detection, M3 achieved area
under receiver operating characteristic (AUROC) 0.832, 0.931, and 0.933 for CFP
alone, FAF alone, and both, respectively. M3 performance on CFP was very
substantially superior to human retinal specialists (median F1-score 0.644
versus 0.350). External validation (on Rotterdam Study, Netherlands)
demonstrated high accuracy on CFP alone (AUROC 0.965). The M3 framework also
accurately detected geographic atrophy and pigmentary abnormalities (AUROC
0.909 and 0.912, respectively), demonstrating its generalizability. Conclusion
This study demonstrates the successful development, robust evaluation, and
external validation of a novel deep learning framework that enables accessible,
accurate, and automated AMD diagnosis and prognosis.
|
[{'version': 'v1', 'created': 'Mon, 9 Nov 2020 03:26:38 GMT'}
{'version': 'v2', 'created': 'Wed, 11 Nov 2020 13:26:39 GMT'}]
|
2020-11-12
|
[array(['Chen', 'Qingyu', '',
'for the AREDS2 Deep Learning Research Group'], dtype=object)
array(['Keenan', 'Tiarnan D. L.', '',
'for the AREDS2 Deep Learning Research Group'], dtype=object)
array(['Allot', 'Alexis', '',
'for the AREDS2 Deep Learning Research Group'], dtype=object)
array(['Peng', 'Yifan', '', 'for the AREDS2 Deep Learning Research Group'],
dtype=object)
array(['Agrón', 'Elvira', '',
'for the AREDS2 Deep Learning Research Group'], dtype=object)
array(['Domalpally', 'Amitha', '',
'for the AREDS2 Deep Learning Research Group'], dtype=object)
array(['Klaver', 'Caroline C. W.', '',
'for the AREDS2 Deep Learning Research Group'], dtype=object)
array(['Luttikhuizen', 'Daniel T.', '',
'for the AREDS2 Deep Learning Research Group'], dtype=object)
array(['Colyer', 'Marcus H.', '',
'for the AREDS2 Deep Learning Research Group'], dtype=object)
array(['Cukras', 'Catherine A.', '',
'for the AREDS2 Deep Learning Research Group'], dtype=object)
array(['Wiley', 'Henry E.', '',
'for the AREDS2 Deep Learning Research Group'], dtype=object)
array(['Magone', 'M. Teresa', '',
'for the AREDS2 Deep Learning Research Group'], dtype=object)
array(['Cousineau-Krieger', 'Chantal', '',
'for the AREDS2 Deep Learning Research Group'], dtype=object)
array(['Wong', 'Wai T.', '',
'for the AREDS2 Deep Learning Research Group'], dtype=object)
array(['Zhu', 'Yingying', '',
'for the AREDS2 Deep Learning Research Group'], dtype=object)
array(['Chew', 'Emily Y.', '',
'for the AREDS2 Deep Learning Research Group'], dtype=object)
array(['Lu', 'Zhiyong', '', 'for the AREDS2 Deep Learning Research Group'],
dtype=object) ]
|
2,044 |
2212.03764
|
Pu Liu
|
Pu Liu, Chaoxi Cui, Xiao-Ping Li, Zhi-Ming Yu, and Yugui Yao
|
Landau level spectrum and magneto-optical conductivity in tilted Weyl
semimetal
| null | null |
10.1103/PhysRevB.107.085146
| null |
cond-mat.str-el
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a systematic investigation of the magnetoresponses of the Weyl
points (WPs) with a topological charge of n = 2, 3 and 4, and with both linear
and quadratic energy tilt. The linear tilt always tends to squeeze the Landau
levels (LLs) of both conduction and valence bands of all the WPs, and
eventually leads to LL collapse in the type-II phase. However, the quadratic
energy tilt has more complex influences on the LLs of the unconventional WPs.
For charge-n (n = 2, 4) WP, the influence of the quadratic tilt on the LLs of
conduction and valence bands are opposite, i.e. if the LLs of conduction
(valence) bands are squeezed, then that of the valence (conduction) bands are
broadened, and the squeezed LL spectrum will be collapsed in type-III phase.
But, the LL collapse generally can not be found in the type-III charge-3 WP.
Moreover, for charge-n (n = 2, 3) WP, the quadratic tilt breaks the degeneracy
of the chiral LLs regardless of the direction of the magnetic field, leading to
additional optical transitions and magneto-optical conductivity peaks at low
frequencies. Interestingly, the four chiral LLs in charge-4 WP are always not
degenerate. Hence, there inevitably exist magneto-optical conductivity peaks at
low frequencies for charge-4 WP. Since the density of state of the LL spectrum
is very large, one can expect that the low-frequency magneto-optical responses
in unconventional WPs would be significant and may be used for developing
efficient terahertz photodetectors.
|
[{'version': 'v1', 'created': 'Wed, 7 Dec 2022 16:34:47 GMT'}]
|
2023-03-08
|
[array(['Liu', 'Pu', ''], dtype=object)
array(['Cui', 'Chaoxi', ''], dtype=object)
array(['Li', 'Xiao-Ping', ''], dtype=object)
array(['Yu', 'Zhi-Ming', ''], dtype=object)
array(['Yao', 'Yugui', ''], dtype=object)]
|
2,045 |
1003.1455
|
Rdv Ijcsis
|
Rama N., Meenakshi Lakshmanan
|
A Computational Algorithm based on Empirical Analysis, that Composes
Sanskrit Poetry
|
Pages IEEE format, International Journal of Computer Science and
Information Security, IJCSIS February 2010, ISSN 1947 5500,
http://sites.google.com/site/ijcsis/
|
International Journal of Computer Science and Information
Security, IJCSIS, Vol. 7, No. 2, pp. 056-062, February 2010, USA
| null |
Computer Science ISSN 19475500
|
cs.CL
|
http://creativecommons.org/licenses/by-nc-sa/3.0/
|
Poetry-writing in Sanskrit is riddled with problems for even those who know
the language well. This is so because the rules that govern Sanskrit prosody
are numerous and stringent. We propose a computational algorithm that converts
prose given as E-text into poetry in accordance with the metrical rules of
Sanskrit prosody, simultaneously taking care to ensure that sandhi or euphonic
conjunction, which is compulsory in verse, is handled. The algorithm is
considerably speeded up by a novel method of reducing the target search
database. The algorithm further gives suggestions to the poet in case what
he/she has given as the input prose is impossible to fit into any allowed
metrical format. There is also an interactive component of the algorithm by
which the algorithm interacts with the poet to resolve ambiguities. In
addition, this unique work, which provides a solution to a problem that has
never been addressed before, provides a simple yet effective speech recognition
interface that would help the visually impaired dictate words in E-text, which
is in turn versified by our Poetry Composer Engine.
|
[{'version': 'v1', 'created': 'Sun, 7 Mar 2010 11:28:08 GMT'}]
|
2010-03-09
|
[array(['N.', 'Rama', ''], dtype=object)
array(['Lakshmanan', 'Meenakshi', ''], dtype=object)]
|
2,046 |
1910.01108
|
Victor Sanh
|
Victor Sanh, Lysandre Debut, Julien Chaumond, Thomas Wolf
|
DistilBERT, a distilled version of BERT: smaller, faster, cheaper and
lighter
|
February 2020 - Revision: fix bug in evaluation metrics, updated
metrics, argumentation unchanged. 5 pages, 1 figure, 4 tables. Accepted at
the 5th Workshop on Energy Efficient Machine Learning and Cognitive Computing
- NeurIPS 2019
| null | null | null |
cs.CL
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
As Transfer Learning from large-scale pre-trained models becomes more
prevalent in Natural Language Processing (NLP), operating these large models in
on-the-edge and/or under constrained computational training or inference
budgets remains challenging. In this work, we propose a method to pre-train a
smaller general-purpose language representation model, called DistilBERT, which
can then be fine-tuned with good performances on a wide range of tasks like its
larger counterparts. While most prior work investigated the use of distillation
for building task-specific models, we leverage knowledge distillation during
the pre-training phase and show that it is possible to reduce the size of a
BERT model by 40%, while retaining 97% of its language understanding
capabilities and being 60% faster. To leverage the inductive biases learned by
larger models during pre-training, we introduce a triple loss combining
language modeling, distillation and cosine-distance losses. Our smaller, faster
and lighter model is cheaper to pre-train and we demonstrate its capabilities
for on-device computations in a proof-of-concept experiment and a comparative
on-device study.
|
[{'version': 'v1', 'created': 'Wed, 2 Oct 2019 17:56:28 GMT'}
{'version': 'v2', 'created': 'Wed, 16 Oct 2019 14:52:02 GMT'}
{'version': 'v3', 'created': 'Fri, 24 Jan 2020 16:58:52 GMT'}
{'version': 'v4', 'created': 'Sun, 1 Mar 2020 02:57:50 GMT'}]
|
2020-03-03
|
[array(['Sanh', 'Victor', ''], dtype=object)
array(['Debut', 'Lysandre', ''], dtype=object)
array(['Chaumond', 'Julien', ''], dtype=object)
array(['Wolf', 'Thomas', ''], dtype=object)]
|
2,047 |
1211.5691
|
Mikhail Sheftel B.
|
M. B. Sheftel and D. Yaz{\i}c{\i}
|
Anti-self-dual gravity from asymmetric heavenly equation standpoint
|
LaTeX2e, 17 pages
| null | null | null |
math-ph gr-qc math.MP nlin.SI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In paper [3] on the classification of second-order PDEs with four independent
variables that possess partner symmetries, asymmetric heavenly equation appears
as one of canonical equations admitting partner symmetries. It was shown that
all these canonical equations, together with general heavenly equation of
Dubrov and Ferapontov [4], provide potentials for anti-self-dual Ricci-flat
vacuum metrics [1,2,5], the asymmetric heavenly equation presenting the only
exception so far. Our aim here is to show that the latter equation also governs
anti-self-dual vacuum heavenly metric. We present the corresponding basis of
null vector fields, null tetrad of coframe 1-forms and a general form of the
metric. We obtain a multi-parameter polynomial solution of our equation which
yields a family of metrics with the above properties. Riemann curvature 2-forms
are also explicitly presented for the cubic solution to modified heavenly
equation [4], which is a particular case of the asymmetric heavenly equation.
|
[{'version': 'v1', 'created': 'Sat, 24 Nov 2012 18:43:20 GMT'}]
|
2016-08-14
|
[array(['Sheftel', 'M. B.', ''], dtype=object)
array(['Yazıcı', 'D.', ''], dtype=object)]
|
2,048 |
0705.4464
|
Igor Zutic
|
A. G. Petukhov, Igor Zutic, Steven C. Erwin
|
Thermodynamics of carrier-mediated magnetism in semiconductors
|
4 pages, 3 figures
|
Phys. Rev. Lett. 99, 257202 (2007)
|
10.1103/PhysRevLett.99.257202
| null |
cond-mat.mtrl-sci cond-mat.other
| null |
We propose a model of carrier-mediated ferromagnetism in semiconductors that
accounts for the temperature dependence of the carriers. The model permits
analysis of the thermodynamic stability of competing magnetic states, opening
the door to the construction of magnetic phase diagrams. As an example we
analyze the stability of a possible reentrant ferromagnetic semiconductor, in
which increasing temperature leads to an increased carrier density, such that
the enhanced exchange coupling between magnetic impurities results in the onset
of ferromagnetism as temperature is raised.
|
[{'version': 'v1', 'created': 'Wed, 30 May 2007 20:01:46 GMT'}]
|
2010-11-09
|
[array(['Petukhov', 'A. G.', ''], dtype=object)
array(['Zutic', 'Igor', ''], dtype=object)
array(['Erwin', 'Steven C.', ''], dtype=object)]
|
2,049 |
1811.10656
|
Alexey Ignatiev
|
Alexey Ignatiev, Nina Narodytska, Joao Marques-Silva
|
Abduction-Based Explanations for Machine Learning Models
| null | null | null | null |
cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The growing range of applications of Machine Learning (ML) in a multitude of
settings motivates the ability of computing small explanations for predictions
made. Small explanations are generally accepted as easier for human decision
makers to understand. Most earlier work on computing explanations is based on
heuristic approaches, providing no guarantees of quality, in terms of how close
such solutions are from cardinality- or subset-minimal explanations. This paper
develops a constraint-agnostic solution for computing explanations for any ML
model. The proposed solution exploits abductive reasoning, and imposes the
requirement that the ML model can be represented as sets of constraints using
some target constraint reasoning system for which the decision problem can be
answered with some oracle. The experimental results, obtained on well-known
datasets, validate the scalability of the proposed approach as well as the
quality of the computed solutions.
|
[{'version': 'v1', 'created': 'Mon, 26 Nov 2018 19:27:26 GMT'}]
|
2018-11-28
|
[array(['Ignatiev', 'Alexey', ''], dtype=object)
array(['Narodytska', 'Nina', ''], dtype=object)
array(['Marques-Silva', 'Joao', ''], dtype=object)]
|
2,050 |
2204.10792
|
K. Ritsuka
|
K. Ritsuka (1), Karen Rudie (1) ((1) Queen's University, Kingston,
Canada)
|
A correspondence between control and observation problems in
decentralized discrete-event systems
| null | null | null | null |
eess.SY cs.SY
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper demonstrates a correspondence between control problems (with
partial observation) and observation problems in decentralized discrete-event
systems, namely, the two classes of problems are Turing equivalent, as one
class Turing reduces to the other. The correspondence allows decomposition of a
control problem into a collection of simpler control sub-problems. Since
observation problems in their most general formulation have been shown to be
undecidable in previous work, the correspondence produced in this paper
demonstrates that control problems -- in their most general form -- is also
undecidable.
|
[{'version': 'v1', 'created': 'Fri, 22 Apr 2022 16:09:16 GMT'}]
|
2023-02-02
|
[array(['Ritsuka', 'K.', ''], dtype=object)
array(['Rudie', 'Karen', ''], dtype=object)]
|
2,051 |
1306.3035
|
Paniez Paykari
|
P. Paykari, S. Pires, J. -L. Starck and A. H. Jaffe
|
Sparsely Sampling the Sky: Regular vs Random Sampling
|
arXiv admin note: text overlap with arXiv:1212.3194
|
A&A 581, A113 (2015)
|
10.1051/0004-6361/201526236
| null |
astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The next generation of galaxy surveys, aiming to observe millions of
galaxies, are expensive both in time and cost. This raises questions regarding
the optimal investment of this time and money for future surveys. In a previous
work, it was shown that a sparse sampling strategy could be a powerful
substitute for the contiguous observations. However, in this previous paper a
regular sparse sampling was investigated, where the sparse observed patches
were regularly distributed on the sky. The regularity of the mask introduces a
periodic pattern in the window function, which induces periodic correlations at
specific scales. In this paper, we use the Bayesian experimental design to
investigate a random sparse sampling, where the observed patches are randomly
distributed over the total sparsely sampled area. We find that, as there is no
preferred scale in the window function, the induced correlation is evenly
distributed amongst all scales. This could be desirable if we are interested in
specific scales in the galaxy power spectrum, such as the Baryonic Acoustic
Oscillation (BAO) scales. However, for constraining the overall galaxy power
spectrum and the cosmological parameters, there is no preference over regular
or random sampling. Hence any approach that is practically more suitable can be
chosen and we can relax the regular-grid condition for the distribution of the
observed patches.
|
[{'version': 'v1', 'created': 'Thu, 13 Jun 2013 06:41:00 GMT'}]
|
2015-09-23
|
[array(['Paykari', 'P.', ''], dtype=object)
array(['Pires', 'S.', ''], dtype=object)
array(['Starck', 'J. -L.', ''], dtype=object)
array(['Jaffe', 'A. H.', ''], dtype=object)]
|
2,052 |
1605.06741
|
Muktish Acharyya
|
Abyaya Dhar and Muktish Acharyya
|
Reversal of magnetisation in Ising ferromagnet by the field having
gradient
|
17 pages latex including 8 captioned figures
|
Commun. Theor. Phys. 66 (2016) 563
|
10.1088/0253-6102/66/5/563
|
PU-Phys-22-5-16
|
cond-mat.stat-mech
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We have studied the reversal of magnetisation in Ising ferromagnet by the
field having gradient along a particular direction. We employed the Monte Carlo
simulation with Metropolis single spin flip algorithm. The average lifetime of
the metastable state was observed to increase with the magnitude of the
gradient of applied field. In the high gradient regime, the system was observed
to show two distinct region of up and down spins. The interface or the domain
wall was observed to move as one increases the gradient. The displacement of
the mean position of the interface was observed to increase with the gradient
as hyperbolic tangent function. The roughness of the interface was observed to
decay exponentially as the gradient increases. The number of spin flip per site
was observed to show a discontinuity in the vicinity of the domain wall. The
amount of the discontinuity was found to diverge with the system size as a
power law fashion with an exponent 5/3.
|
[{'version': 'v1', 'created': 'Sun, 22 May 2016 05:52:22 GMT'}
{'version': 'v2', 'created': 'Sat, 3 Sep 2016 15:35:31 GMT'}]
|
2016-11-23
|
[array(['Dhar', 'Abyaya', ''], dtype=object)
array(['Acharyya', 'Muktish', ''], dtype=object)]
|
2,053 |
2212.07618
|
Mengnan Shi
|
Bohao Li, Chang Liu, Mengnan Shi, Xiaozhong Chen, Xiangyang Ji,
Qixiang Ye
|
Proposal Distribution Calibration for Few-Shot Object Detection
|
This paper is under review in IEEE TNNLS
| null | null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Adapting object detectors learned with sufficient supervision to novel
classes under low data regimes is charming yet challenging. In few-shot object
detection (FSOD), the two-step training paradigm is widely adopted to mitigate
the severe sample imbalance, i.e., holistic pre-training on base classes, then
partial fine-tuning in a balanced setting with all classes. Since unlabeled
instances are suppressed as backgrounds in the base training phase, the learned
RPN is prone to produce biased proposals for novel instances, resulting in
dramatic performance degradation. Unfortunately, the extreme data scarcity
aggravates the proposal distribution bias, hindering the RoI head from evolving
toward novel classes. In this paper, we introduce a simple yet effective
proposal distribution calibration (PDC) approach to neatly enhance the
localization and classification abilities of the RoI head by recycling its
localization ability endowed in base training and enriching high-quality
positive samples for semantic fine-tuning. Specifically, we sample proposals
based on the base proposal statistics to calibrate the distribution bias and
impose additional localization and classification losses upon the sampled
proposals for fast expanding the base detector to novel classes. Experiments on
the commonly used Pascal VOC and MS COCO datasets with explicit
state-of-the-art performances justify the efficacy of our PDC for FSOD. Code is
available at github.com/Bohao-Lee/PDC.
|
[{'version': 'v1', 'created': 'Thu, 15 Dec 2022 05:09:11 GMT'}]
|
2022-12-16
|
[array(['Li', 'Bohao', ''], dtype=object)
array(['Liu', 'Chang', ''], dtype=object)
array(['Shi', 'Mengnan', ''], dtype=object)
array(['Chen', 'Xiaozhong', ''], dtype=object)
array(['Ji', 'Xiangyang', ''], dtype=object)
array(['Ye', 'Qixiang', ''], dtype=object)]
|
2,054 |
1804.03854
|
M\'at\'e Lehel Juh\'asz
|
Mate Lehel Juhasz
|
Revisiting the universal linear algebraic model for the characteristic
two case
| null | null | null | null |
math.MG math.RA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In a previous article, a universal linear algebraic model was proposed for
describing homogeneous conformal geometries, such as the spherical, Euclidean,
hyperbolic, Minkowski, anti-de Sitter and Galilei planes. This formalism was
independent from the underlying field, providing an extension and general
approach to other fields, such as finite fields. Some steps were taken even for
the characteristic $2$ case.
In this article, we undertake the study of the characteristic $2$ case in
more detail. In particular, the concept of virtual quadratic spaces is used,
defined in a previous article by the author, and a similar result is achieved
for finite fields of characteristic $2$ as for other fields. Some differences
from the non-characteristic $2$ case are also pointed out.
|
[{'version': 'v1', 'created': 'Wed, 11 Apr 2018 07:55:09 GMT'}]
|
2018-04-12
|
[array(['Juhasz', 'Mate Lehel', ''], dtype=object)]
|
2,055 |
2211.02988
|
Thomas Planche
|
Thomas Planche
|
Constant-Tune Cyclotrons
| null | null |
10.1088/1748-0221/18/03/P03019
| null |
physics.acc-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we demonstrate that cyclotrons can be made to have precisely
constant betatron tunes over wide energy ranges. In particular, we show that
the horizontal tune can be made constant and does not have to follow the
Lorentz factor gamma, while still perfectly satisfying the isochronous
condition. To make this demonstration we developed a technique based on the
calculation of the betatron tunes entirely from the geometry of realistic
non-hard-edge closed orbits. We present two particular cyclotron designs, one
compact cyclotron and one ring cyclotron. The compact cyclotron design is
backed up by a 3-dimensional finite element magnet calculation, that we also
present here.
|
[{'version': 'v1', 'created': 'Sat, 5 Nov 2022 22:48:15 GMT'}
{'version': 'v2', 'created': 'Thu, 22 Dec 2022 15:26:59 GMT'}
{'version': 'v3', 'created': 'Wed, 4 Jan 2023 20:48:36 GMT'}]
|
2023-03-22
|
[array(['Planche', 'Thomas', ''], dtype=object)]
|
2,056 |
1603.07271
|
Simon Wacker
|
Simon Wacker
|
Cellular Automata on Group Sets and the Uniform Curtis-Hedlund-Lyndon
Theorem
| null |
22nd IFIP WG 1.5 International Workshop, AUTOMATA 2016, Zurich,
Switzerland, June 15-17, 2016, Proceedings (2016) 185-198
|
10.1007/978-3-319-39300-1_15
| null |
math.GR cs.FL
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce cellular automata whose cell spaces are left homogeneous spaces
and prove a uniform as well as a topological variant of the
Curtis-Hedlund-Lyndon theorem. Examples of left homogeneous spaces are spheres,
Euclidean spaces, as well as hyperbolic spaces acted on by isometries;
vertex-transitive graphs, in particular, Cayley graphs, acted on by
automorphisms; groups acting on themselves by multiplication; and integer
lattices acted on by translations.
|
[{'version': 'v1', 'created': 'Mon, 21 Mar 2016 15:37:34 GMT'}
{'version': 'v2', 'created': 'Mon, 13 Jun 2016 06:56:25 GMT'}]
|
2016-07-15
|
[array(['Wacker', 'Simon', ''], dtype=object)]
|
2,057 |
2108.09364
|
Benjamin Jones
|
B.J.P. Jones
|
The Physics of Neutrinoless Double Beta Decay: A Primer
|
A write-up of a lecture series given at the Theoretical Advanced
Study Institute: The Obscure Universe: Neutrinos and Other Dark Matters -
TASI2020 summer school v2: Fix some typos from v1
| null | null | null |
nucl-ex hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Neutrinoless double beta decay is a hypothetical radioactive process which,
if observed, would prove the neutrino to be a Majorana fermion: a particle that
is its own antiparticle. In this lecture mini-series I discuss the physics of
Majorana fermions and the connection between the nature of neutrino mass and
neutrinoless double beta decay. We review Dirac and Majorana spinors, discuss
methods of distinguishing between Majorana and Dirac fermions, and derive in
outline the connection between neutrino mass and double beta decay rates. We
conclude by briefly summarizing the experimental landscape and the challenges
associated with searches for this elusive process.
|
[{'version': 'v1', 'created': 'Fri, 20 Aug 2021 20:52:52 GMT'}
{'version': 'v2', 'created': 'Fri, 25 Feb 2022 00:06:40 GMT'}]
|
2022-02-28
|
[array(['Jones', 'B. J. P.', ''], dtype=object)]
|
2,058 |
1806.06016
|
Henrik Christiansen
|
Henrik Christiansen, Martin Weigel, Wolfhard Janke
|
Accelerating molecular dynamics simulations with population annealing
| null |
Phys. Rev. Lett. 122, 060602 (2019)
|
10.1103/PhysRevLett.122.060602
| null |
physics.comp-ph cond-mat.stat-mech q-bio.BM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Population annealing is a powerful tool for large-scale Monte Carlo
simulations. We adapt this method to molecular dynamics simulations and
demonstrate its excellent accelerating effect by simulating the folding of a
short peptide commonly used to gauge the performance of algorithms. The method
is compared to the well established parallel tempering approach and is found to
yield similar performance for the same computational resources. In contrast to
other methods, however, population annealing scales to a nearly arbitrary
number of parallel processors and it is thus a unique tool that enables
molecular dynamics to tap into the massively parallel computing power available
in supercomputers that is so much needed for a range of difficult computational
problems.
|
[{'version': 'v1', 'created': 'Fri, 15 Jun 2018 15:27:04 GMT'}
{'version': 'v2', 'created': 'Fri, 8 Feb 2019 13:51:49 GMT'}]
|
2019-02-27
|
[array(['Christiansen', 'Henrik', ''], dtype=object)
array(['Weigel', 'Martin', ''], dtype=object)
array(['Janke', 'Wolfhard', ''], dtype=object)]
|
2,059 |
1708.03057
|
Alexandr Buturlakin
|
Alexander Buturlakin, Danila Revin, Andrey Vasil'ev
|
Groups with bounded centralizer chains and the~Borovik--Khukhro
conjecture
| null |
Journal of Group Theory, 2018, Vol. 21 N 6, 1095-1110
|
10.1515/jgth-2018-0026
| null |
math.GR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Let $G$ be a locally finite group and $F(G)$ the Hirsch--Plotkin radical of
$G$. Denote by $S$ the full inverse image of the generalized Fitting subgroup
of $G/F(G)$ in $G$. Assume that there is a number $k$ such that the length of
every chain of nested centralizers in $G$ does not exceed $k$. The
Borovik--Khukhro conjecture states, in particular, that under this assumption
the quotient $G/S$ contains an abelian subgroup of index bounded in terms of
$k$. We disprove this statement and prove some its weaker analog.
|
[{'version': 'v1', 'created': 'Thu, 10 Aug 2017 02:38:30 GMT'}]
|
2022-07-07
|
[array(['Buturlakin', 'Alexander', ''], dtype=object)
array(['Revin', 'Danila', ''], dtype=object)
array(["Vasil'ev", 'Andrey', ''], dtype=object)]
|
2,060 |
1311.6501
|
Andr\'e Neves
|
Fernando C. Marques and Andr'e Neves
|
Existence of infinitely many minimal hypersurfaces in positive Ricci
curvature
|
34 pages, to appear in Inventiones Mathematicae
| null | null | null |
math.DG math.AP math.GT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the early 1980s, S. T. Yau conjectured that any compact Riemannian
three-manifold admits an infinite number of closed immersed minimal surfaces.
We use min-max theory for the area functional to prove this conjecture in the
positive Ricci curvature setting. More precisely, we show that every compact
Riemannian manifold with positive Ricci curvature and dimension at most seven
contains infinitely many smooth, closed, embedded minimal hypersurfaces.
In the last section we mention some open problems related with the geometry
of these minimal hypersurfaces.
|
[{'version': 'v1', 'created': 'Mon, 25 Nov 2013 21:57:16 GMT'}
{'version': 'v2', 'created': 'Wed, 14 Dec 2016 21:38:42 GMT'}]
|
2016-12-16
|
[array(['Marques', 'Fernando C.', ''], dtype=object)
array(['Neves', "Andr'e", ''], dtype=object)]
|
2,061 |
math/0506131
|
Joaquim Ortega-Cerda
|
V.P. Havin, A.H. Nersessian, J. Ortega-Cerda
|
Uniform estimates in the Poincare-Aronszajn Theorem on the separation of
singularities of analytic functions
| null |
J. Anal. Math. 101 (2007), 65--93.
| null | null |
math.CV
| null |
We study the possibility of splitting any bounded analytic function with
singularities in a closed set E union F as a sum of two bounded analytic
functions with singularities in E and F respectively. We obtain some results
under geometric restrictions on the sets E and F and we provide some examples
showing the sharpness of the positive results.
|
[{'version': 'v1', 'created': 'Wed, 8 Jun 2005 10:21:00 GMT'}]
|
2008-08-12
|
[array(['Havin', 'V. P.', ''], dtype=object)
array(['Nersessian', 'A. H.', ''], dtype=object)
array(['Ortega-Cerda', 'J.', ''], dtype=object)]
|
2,062 |
1707.07041
|
Panos Alevizos
|
Panos N. Alevizos and Aggelos Bletsas
|
Sensitive and Nonlinear Far Field RF Energy Harvesting in Wireless
Communications
| null | null |
10.1109/TWC.2018.2812889
| null |
cs.IT math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This work studies both limited sensitivity and nonlinearity of far field RF
energy harvesting observed in reality and quantifies their effect, attempting
to fill a major hole in the simultaneous wireless information and power
transfer (SWIPT) literature. RF harvested power is modeled as an arbitrary
nonlinear, continuous, and non-decreasing function of received power, taking
into account limited sensitivity and saturation effects. RF harvester's
sensitivity may be several dBs worse than communications receiver's
sensitivity, potentially rendering RF information signals useless for energy
harvesting purposes. Given finite number of datapoint pairs of harvested
(output) power and corresponding input power, a piecewise linear approximation
is applied and the statistics of the harvested power are offered, as a function
of the wireless channel fading statistics. Limited number of datapoints are
needed and accuracy analysis is also provided. Case studies include duty-cycled
(non-continuous), as well as continuous SWIPT, comparing with industry-level,
RF harvesting. The proposed approximation, even though simple, offers accurate
performance for all studied metrics. On the other hand, linear models or
nonlinear-unlimited sensitivity harvesting models deviate from reality,
especially in the low input power regime. The proposed methodology can be
utilized in current and future SWIPT research.
|
[{'version': 'v1', 'created': 'Fri, 21 Jul 2017 20:50:28 GMT'}
{'version': 'v2', 'created': 'Thu, 15 Feb 2018 14:48:11 GMT'}
{'version': 'v3', 'created': 'Sun, 4 Mar 2018 13:47:23 GMT'}]
|
2018-04-12
|
[array(['Alevizos', 'Panos N.', ''], dtype=object)
array(['Bletsas', 'Aggelos', ''], dtype=object)]
|
2,063 |
1504.07063
|
Yurii V. Brezhnev
|
Yurii V. Brezhnev
|
On a Quantization of the Classical $\theta$-Functions
| null |
SIGMA 11 (2015), 035, 11 pages
|
10.3842/SIGMA.2015.035
| null |
math-ph math.MP quant-ph
|
http://creativecommons.org/licenses/by-nc-sa/3.0/
|
The Jacobi theta-functions admit a definition through the autonomous
differential equations (dynamical system); not only through the famous Fourier
theta-series. We study this system in the framework of Hamiltonian dynamics and
find corresponding Poisson brackets. Availability of these ingredients allows
us to state the problem of a canonical quantization to these equations and
disclose some important problems. In a particular case the problem is
completely solvable in the sense that spectrum of the Hamiltonian can be found.
The spectrum is continuous, has a band structure with infinite number of
lacunae, and is determined by the Mathieu equation: the Schr\"odinger equation
with a periodic cos-type potential.
|
[{'version': 'v1', 'created': 'Mon, 27 Apr 2015 12:47:27 GMT'}
{'version': 'v2', 'created': 'Wed, 29 Apr 2015 19:30:00 GMT'}]
|
2015-04-30
|
[array(['Brezhnev', 'Yurii V.', ''], dtype=object)]
|
2,064 |
astro-ph/0012475
|
Ofer Lahav
|
Ofer Lahav (Institute of Astronomy, Cambridge U., UK)
|
Cosmological Parameters and Hyper-Parameters: The Hubble Constant from
Boomerang and Maxima
|
Invited talk, to appear in the proceedings of the IAU Symposium 201,
'New Cosmological Data and the Values of the Fundamental Parameters'
Manchester, 2000, ASP; 11 pages, 3 figures
| null | null | null |
astro-ph
| null |
We generalise the procedure for joint estimation of cosmological parameters
to allow freedom in the relative weights of various probes. This is done by
including in the joint Likelihood function a set of 'Hyper-Parameters', which
are dealt with using Bayesian considerations. The resulting algorithm is simple
to implement. We illustrate the method by estimating the Hubble constant H_0
from the recent Cosmic Microwave Background experiments Boomerang and Maxima.
For an assumed flat Lambda-CDM model with fixed parameters (n=1, Omega_m =
1-lambda = 0.3, Omega_b h^2 = 0.03, Qrms = 18 mu K) we solve for a single
parameter, H_0= 79 +- 4 km/sec/Mpc (95 % CL, random errors only), slightly
higher but still consistent with recent results from Cepheids. We discuss how
the 'Hyper-Parameters' approach can be generalised for a combination of cosmic
probes, and for other priors on the Hyper-Parameters.
|
[{'version': 'v1', 'created': 'Fri, 22 Dec 2000 12:53:05 GMT'}]
|
2007-05-23
|
[array(['Lahav', 'Ofer', '', 'Institute of Astronomy, Cambridge U., UK'],
dtype=object) ]
|
2,065 |
astro-ph/9809037
|
Stefanie Komossa
|
Stefanie Komossa (MPE, Garching), Norbert Bade (Hamburger Sternwarte)
|
The giant-amplitude X-ray outburst in NGC 5905 - a tidal disruption
event ?
|
4 pages incl. 3 figures, to appear in the proceedings of `Highlights
in X-ray astronomy', held in Garching, June 1998; B. Aschenbach et al. (eds.)
| null | null | null |
astro-ph
| null |
NGC 5905 is one of the very few galaxies that underwent a giant X-ray
outburst, with a change in photon countrate of a factor 100. The outburst
spectrum is both, very soft and luminous (Bade, Komossa & Dahlem 1996).
Remarkably, the optical pre-outburst emission line spectrum of NGC 5905 is that
of an HII-type galaxy, i.e. does not show any signs of Seyfert activity.
One exciting explanation of the X-ray observation is that we may have
witnessed the tidal disruption of a star by a supermassive black hole (SMBH)
residing in the nucleus of this galaxy. The expected flare of electromagnetic
radiation being produced when the stellar debris is swallowed by the black hole
was proposed by Rees (1988) as a means of tracing SMBHs in nearby non-active
galaxies.
In the present work, we discuss this and other possible outburst scenarios
through an analysis of all ROSAT PSPC and HRI X-ray observations of NGC 5905.
We also present simultaneous and long-term optical photometry of NGC 5905 as
well as follow-up optical spectroscopy.
|
[{'version': 'v1', 'created': 'Thu, 3 Sep 1998 13:53:45 GMT'}]
|
2007-05-23
|
[array(['Komossa', 'Stefanie', '', 'MPE, Garching'], dtype=object)
array(['Bade', 'Norbert', '', 'Hamburger Sternwarte'], dtype=object)]
|
2,066 |
2211.05728
|
Junyu Liu
|
Junyu Liu, Han Zheng, Masanori Hanada, Kanav Setia, Dan Wu
|
Quantum Power Flows: From Theory to Practice
|
30 pages, many figures
| null | null | null |
quant-ph cs.AI cs.LG cs.SY eess.SY
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Climate change is becoming one of the greatest challenges to the sustainable
development of modern society. Renewable energies with low density greatly
complicate the online optimization and control processes, where modern advanced
computational technologies, specifically quantum computing, have significant
potential to help. In this paper, we discuss applications of quantum computing
algorithms toward state-of-the-art smart grid problems. We suggest potential,
exponential quantum speedup by the use of the Harrow-Hassidim-Lloyd (HHL)
algorithms for sparse matrix inversions in power-flow problems. However,
practical implementations of the algorithm are limited by the noise of quantum
circuits, the hardness of realizations of quantum random access memories
(QRAM), and the depth of the required quantum circuits. We benchmark the
hardware and software requirements from the state-of-the-art power-flow
algorithms, including QRAM requirements from hybrid phonon-transmon systems,
and explicit gate counting used in HHL for explicit realizations. We also
develop near-term algorithms of power flow by variational quantum circuits and
implement real experiments for 6 qubits with a truncated version of power
flows.
|
[{'version': 'v1', 'created': 'Thu, 10 Nov 2022 17:52:43 GMT'}]
|
2022-11-11
|
[array(['Liu', 'Junyu', ''], dtype=object)
array(['Zheng', 'Han', ''], dtype=object)
array(['Hanada', 'Masanori', ''], dtype=object)
array(['Setia', 'Kanav', ''], dtype=object)
array(['Wu', 'Dan', ''], dtype=object)]
|
2,067 |
1505.02601
|
Ruiqiang Guo
|
Ruiqiang Guo, Xinjiang Wang, Youdi Kuang and Baoling Huang
|
First-principles study of anisotropic thermoelectric transport
properties of IV-VI semiconductor compounds SnSe and SnS
| null |
Phys. Rev. B 92, 115202 (2015)
|
10.1103/PhysRevB.92.115202
| null |
cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We conduct comprehensive investigations of both thermal and electrical
transport properties of SnSe and SnS using first-principles calculations
combined with the Boltzmann transport theory. Due to the distinct layered
lattice structure, SnSe and SnS exhibit similarly anisotropic thermal and
electrical behaviors. The cross-plane lattice thermal conductivity $\kappa_{L}$
is 40-60% lower than the in-plane values. Extremely low $\kappa_{L}$ is found
for both materials because of high anharmonicity. It is suggested that
nanostructuring would be difficult to further decrease $\kappa_{L}$ because of
the short mean free paths of dominant phonon modes (1-30 nm at 300 K) while
alloying would be efficient in reducing $\kappa_{L}$ considering that the
relative $\kappa_{L}$ contribution ($\sim$ 65%) of optical phonons is
remarkably large. On the electrical side, the anisotropic electrical
conductivities are mainly due to the different effective masses of holes and
electrons along the $a$, $b$ and $c$ axes. This leads to the highest optimal
$ZT$ values along the $b$ axis and lowest ones along the $a$ axis in both
$p$-type materials. However, the $n$-type ones exhibit the highest $ZT$s along
the $a$ axis due to the enhancement of power factor when the chemical potential
gradually approaches the secondary band valley that causes significant increase
in electron mobility and density of states. SnSe exhibits larger optimal $ZT$s
compared with SnS in both $p$-type and $n$-type materials. For both materials,
the peak $ZT$s of $n$-type materials are much higher than those of $p$-type
ones along the same direction. The predicted highest $ZT$ values at 750 K are
1.0 in SnSe and 0.6 in SnS along the $b$ axis for the $p$-type doping while
those for the $n$-type doping reach 2.7 in SnSe and 1.5 in SnS along the $a$
axis, rendering them among the best bulk thermoelectric materials for
large-scale applications.
|
[{'version': 'v1', 'created': 'Mon, 11 May 2015 13:26:45 GMT'}
{'version': 'v2', 'created': 'Sat, 13 Jun 2015 10:30:10 GMT'}
{'version': 'v3', 'created': 'Tue, 13 Oct 2015 09:34:25 GMT'}]
|
2015-10-14
|
[array(['Guo', 'Ruiqiang', ''], dtype=object)
array(['Wang', 'Xinjiang', ''], dtype=object)
array(['Kuang', 'Youdi', ''], dtype=object)
array(['Huang', 'Baoling', ''], dtype=object)]
|
2,068 |
2110.14579
|
Giulia Bertaglia
|
Giulia Bertaglia, Liu Liu, Lorenzo Pareschi, Xueyu Zhu
|
Bi-fidelity stochastic collocation methods for epidemic transport models
with uncertainties
| null |
Netw. Heterog. Media 17 (2022) 401-425
|
10.3934/nhm.2022013
| null |
math.NA cs.NA q-bio.PE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Uncertainty in data is certainly one of the main problems in epidemiology, as
shown by the recent COVID-19 pandemic. The need for efficient methods capable
of quantifying uncertainty in the mathematical model is essential in order to
produce realistic scenarios of the spread of infection. In this paper, we
introduce a bi-fidelity approach to quantify uncertainty in spatially dependent
epidemic models. The approach is based on evaluating a high-fidelity model on a
small number of samples properly selected from a large number of evaluations of
a low-fidelity model. In particular, we will consider the class of multiscale
transport models recently introduced in Bertaglia, Boscheri, Dimarco &
Pareschi, Math. Biosci. Eng. (2021) and Boscheri, Dimarco & Pareschi, Math.
Mod. Meth. App. Scie. (2021) as the high-fidelity reference and use simple
two-velocity discrete models for low-fidelity evaluations. Both models share
the same diffusive behavior and are solved with ad-hoc asymptotic-preserving
numerical discretizations. A series of numerical experiments confirm the
validity of the approach.
|
[{'version': 'v1', 'created': 'Wed, 27 Oct 2021 16:47:06 GMT'}]
|
2022-05-10
|
[array(['Bertaglia', 'Giulia', ''], dtype=object)
array(['Liu', 'Liu', ''], dtype=object)
array(['Pareschi', 'Lorenzo', ''], dtype=object)
array(['Zhu', 'Xueyu', ''], dtype=object)]
|
2,069 |
1501.02374
|
Jing Xi
|
Jing Xi, Jin Xie and Ruriko Yoshida
|
Distributions of topological tree metrics between a species tree and a
gene tree
|
18 pages, 11 figures
| null | null | null |
q-bio.PE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In order to conduct a statistical analysis on a given set of phylogenetic
gene trees, we often use a distance measure between two trees. In a statistical
distance-based method to analyze discordance between gene trees, it is a key to
decide "biological meaningful" and "statistically well-distributed" distance
between trees. Thus, in this paper, we study the distributions of the three
tree distance metrics: the edge difference, the path difference, and the
precise $K$ interval cospeciation distance, between two trees: first, we focus
on distributions of the three tree distances between two random unrooted trees
with $n$ leaves ($n \geq 4$); and then we focus on the distributions the three
tree distances between a fixed rooted species tree with $n$ leaves and a random
gene tree with $n$ leaves generated under the coalescent process with given the
species tree. We show some theoretical results as well as simulation study on
these distributions.
|
[{'version': 'v1', 'created': 'Sat, 10 Jan 2015 17:40:28 GMT'}
{'version': 'v2', 'created': 'Thu, 4 Feb 2016 00:09:49 GMT'}]
|
2016-02-05
|
[array(['Xi', 'Jing', ''], dtype=object)
array(['Xie', 'Jin', ''], dtype=object)
array(['Yoshida', 'Ruriko', ''], dtype=object)]
|
2,070 |
1307.1901
|
Steven Sam
|
Steven V Sam
|
Homology of analogues of Heisenberg Lie algebras
|
13 pages; v2: small corrections and added Remark 1.6
|
Math. Res. Lett. 22 (2015), no. 4, 1223-1241
|
10.4310/MRL.2015.v22.n4.a13
| null |
math.RT math.CO math.KT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the homology of three families of 2-step nilpotent Lie
(super)algebras associated with the symplectic, orthogonal, and general linear
groups. The symplectic case was considered by Getzler and the main motivation
for this work was to complete the calculations started by him. In all three
cases, these algebras can be realized as the nilpotent radical of a parabolic
subalgebra of a simple Lie algebra, and our first approach relies on a theorem
of Kostant, but is otherwise elementary and involves combinatorics of Weyl
groups and partitions which may be of independent interest. Our second approach
is an application of (un)stable representation theory of the classical groups
in the sense of recent joint work of the author with Snowden, which is shorter
and more conceptual.
|
[{'version': 'v1', 'created': 'Sun, 7 Jul 2013 19:14:33 GMT'}
{'version': 'v2', 'created': 'Fri, 10 Jul 2015 19:04:16 GMT'}]
|
2015-07-27
|
[array(['Sam', 'Steven V', ''], dtype=object)]
|
2,071 |
1208.1619
|
Lucian Covaci
|
L.-F. Zhang, L. Covaci, M. V. Milo\v{s}evi\'c, G .R. Berdiyorov and
F.M. Peeters
|
Unconventional vortex states in nanoscale superconductors due to
shape-induced resonances in the inhomogeneous Cooper-pair condensate
|
to appear in Phys. Rev. Lett
|
Phys. Rev. Lett. 109, 107001 (2012)
|
10.1103/PhysRevLett.109.107001
| null |
cond-mat.supr-con
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Vortex matter in mesoscopic superconductors is known to be strongly affected
by the geometry of the sample. Here we show that in nanoscale superconductors
with coherence length comparable to the Fermi wavelength the shape resonances
of the order parameter results in an additional contribution to the quantum
topological confinement - leading to unconventional vortex configurations. Our
Bogoliubov-de Gennes calculations in a square geometry reveal a plethora of
asymmetric, giant multi-vortex, and vortex-antivortex structures, stable over a
wide range of parameters and which are very different from those predicted by
the Ginzburg-Landau theory. These unconventional states are relevant for
high-Tc nanograins, confined Bose-Einstein condensates, and graphene flakes
with proximity-induced superconductivity.
|
[{'version': 'v1', 'created': 'Wed, 8 Aug 2012 09:23:49 GMT'}]
|
2014-01-20
|
[array(['Zhang', 'L. -F.', ''], dtype=object)
array(['Covaci', 'L.', ''], dtype=object)
array(['Milošević', 'M. V.', ''], dtype=object)
array(['Berdiyorov', 'G . R.', ''], dtype=object)
array(['Peeters', 'F. M.', ''], dtype=object)]
|
2,072 |
1211.4649
|
Ashish Khisti
|
Ashish Khist and Dongye Zhang
|
Artificial-Noise Alignment for Secure Multicast using Multiple Antennas
|
3 Pages
| null | null | null |
cs.IT math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose an artificial-noise alignment scheme for multicasting a
common-confidential message to a group of receivers. Our scheme transmits a
superposition of information and noise symbols. The noise symbols are aligned
at each legitimate receiver and hence the information symbols can be decoded.
In contrast, the noise symbols completely mask the information symbols at the
eavesdroppers. Our proposed scheme does not require the knowledge of the
eavesdropper's channel gains at the transmitter for alignment, yet it achieves
the best-known lower bound on the secure degrees of freedom. Our scheme is also
a natural generalization of the approach of transmitting artificial noise in
the null-space of the legitimate receiver's channel, previously proposed in the
literature.
|
[{'version': 'v1', 'created': 'Tue, 20 Nov 2012 01:44:59 GMT'}]
|
2012-11-21
|
[array(['Khist', 'Ashish', ''], dtype=object)
array(['Zhang', 'Dongye', ''], dtype=object)]
|
2,073 |
1811.01161
|
Engin Arslan
|
Engin Arslan, Ahmed Alhussen
|
Fast Integrity Verification for High-Speed File Transfers
| null | null | null | null |
cs.DC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The amount of data generated by scientific and commercial applications is
growing at an ever-increasing pace. This data is often moved between
geographically distributed sites for various purposes such as collaboration and
backup which has led to significant increase in data transfer rates. Surge in
data transfer rates when combined with proliferation of scientific applications
that cannot tolerate data corruption triggered enhanced integrity verification
techniques to be developed. End-to-end integrity verification minimizes the
likelihood of silent data corruption by comparing checksum of files at source
and destination servers using secure hash algorithms such as MD5 and SHA1.
However, it imposes significant performance penalty due to overhead of checksum
computation. In this paper, we propose Fast Integrity VERification (FIVER)
algorithm which overlaps checksum computation and data transfer operations of
files to minimize the cost of integrity verification. Extensive experiments
show that FIVER is able to bring down the cost from 60% by the state-of-the-art
solutions to below 10% by concurrently executing transfer and checksum
operations and enabling file I/O share between them. We also implemented
FIVER-Hybrid to mimic disk access patterns of sequential integrity verification
approach to capture possible data corruption that may occur during file write
operations which FIVER may miss. Results show that FIVER-Hybrid is able to
reduce execution time by 20% compared to sequential approach without
compromising the reliability of integrity verification.
|
[{'version': 'v1', 'created': 'Sat, 3 Nov 2018 04:56:15 GMT'}]
|
2018-11-06
|
[array(['Arslan', 'Engin', ''], dtype=object)
array(['Alhussen', 'Ahmed', ''], dtype=object)]
|
2,074 |
astro-ph/0209234
| null |
Z.-Q. Shen (1), J. M. Moran (2), and K. I. Kellermann (3) ((1) Isas,
Japan, (2) Cfa, Usa, (3) Nrao, Usa)
|
The Central Parsecs of the Bright Quasar PKS 1921 - 293
|
2 pages including 2 ps figures, to appear in the proceedings of IAU
8th Asian-Pacific Regional Meeting (July 2 - 5, 2002, Tokyo, Japan), eds: S.
Ikeuchi, J. Hearnshaw and T. Hanawa
| null | null | null |
astro-ph
| null |
We report on a VLBA imaging study of the nearby bright southern blazar PKS
1921 - 293 (OV - 236). High resolution VLBA observations, made at four
frequencies (5, 12, 15, and 43 GHz) over the period 1994 - 2000, have revealed
a strongly curved jet extending out to about 50 parsecs from the presumed
central engine. Two epoch VLBA observations, each simultaneously carried out at
both 5 and 43 GHz, show a large position angle difference of 51 - 67 degrees
between the jet emission at 5 and 43 GHz. Although the core of PKS 1921 - 293
has one of the highest brightness temperatures measured in any compact radio
source, unlike other bright blazars it is not a source of gamma-ray emission.
However, there is evidence in these images for superluminal motion within the
central region (a few parsecs from the core) and within the north-east diffuse
emission region. In all six-epoch 43 GHz images, two equally compact bright
components within the central parsec are seen.
|
[{'version': 'v1', 'created': 'Thu, 12 Sep 2002 02:37:56 GMT'}]
|
2007-05-23
|
[array(['Shen', 'Z. -Q.', ''], dtype=object)
array(['Moran', 'J. M.', ''], dtype=object)
array(['Kellermann', 'K. I.', ''], dtype=object)]
|
2,075 |
1803.00612
|
Yang Yu
|
Yang Yu, Kazi Saidul Hasan, Mo Yu, Wei Zhang, Zhiguo Wang
|
Knowledge Base Relation Detection via Multi-View Matching
| null | null | null | null |
cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Relation detection is a core component for Knowledge Base Question Answering
(KBQA). In this paper, we propose a KB relation detection model via multi-view
matching which utilizes more useful information extracted from question and KB.
The matching inside each view is through multiple perspectives to compare two
input texts thoroughly. All these components are designed in an end-to-end
trainable neural network model. Experiments on SimpleQuestions and WebQSP yield
state-of-the-art results.
|
[{'version': 'v1', 'created': 'Thu, 1 Mar 2018 20:17:02 GMT'}
{'version': 'v2', 'created': 'Mon, 9 Apr 2018 14:19:18 GMT'}]
|
2018-04-10
|
[array(['Yu', 'Yang', ''], dtype=object)
array(['Hasan', 'Kazi Saidul', ''], dtype=object)
array(['Yu', 'Mo', ''], dtype=object)
array(['Zhang', 'Wei', ''], dtype=object)
array(['Wang', 'Zhiguo', ''], dtype=object)]
|
2,076 |
0712.0751
|
Efim Brener
|
Efim A. Brener and D.E. Temkin
|
Melting of alloys along grain boundaries
|
submitted to Acta Materialia
| null | null | null |
cond-mat.mtrl-sci
| null |
We discuss melting of alloys along grain boundaries as a free boundary
problem for two moving solid-liquid interfaces. One of them is the melting
front and the other is the solidification front. The presence of the triple
junction plays an important role in controlling the velocity of this process.
The interfaces strongly interact via the diffusion field in the thin liquid
layer between them. In the liquid film migration (LFM) mechanism the system
chooses a more efficient kinetic path, which is controlled by diffusion in the
liquid film on relatively short distances. However, only weak coherency strain
energy is the effective driving force for LFM in the case of melting of
one-phase alloys.
The process with only one melting front would be controlled by the very slow
diffusion in the mother solid phase on relatively large distances.
|
[{'version': 'v1', 'created': 'Wed, 5 Dec 2007 15:37:53 GMT'}]
|
2007-12-06
|
[array(['Brener', 'Efim A.', ''], dtype=object)
array(['Temkin', 'D. E.', ''], dtype=object)]
|
2,077 |
1009.5781
|
Enrique Ruiz Arriola
|
Enrique Ruiz Arriola and Wojciech Broniowski
|
Transversity relations, chiral and holographic models, and pion wave
functions from lattice QCD
|
8 pages, 2 figures, talk presented by ERA at Light Cone 2010,
Valencia, 14-18 June 2010
|
PoS LC2010:041,2010
| null | null |
hep-ph hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze the equal-time Bethe-Salpeter quark wave functions of the pion in
various models. We discuss how the quenched lattice QCD results with
delocalized pion interpolators can be identified with the coarse grained wave
functions, typical of low-energy effective models. Actually, we find that
one-loop chiral quark models predict that pseudoscalar and tensor wave
functions have the same shape, while the axial component is more extended.
These facts are accurately confirmed by the lattice. We also show how the
transversity information, relevant for the light-cone physics, can be
straightforwardly obtained from the equal-time rest-frame lattice calculations.
This remarkable relation provides a way to extract, for instance, the
equal-time holographic wave functions and compare them, quite favorably, to the
lattice calculations.
|
[{'version': 'v1', 'created': 'Wed, 29 Sep 2010 06:42:33 GMT'}]
|
2011-03-10
|
[array(['Arriola', 'Enrique Ruiz', ''], dtype=object)
array(['Broniowski', 'Wojciech', ''], dtype=object)]
|
2,078 |
cond-mat/0403266
|
A. L. Kuzemsky
|
A. L. Kuzemsky
|
Role of Correlation and Exchange for Quasi-particle Spectra of Magnetic
and Diluted Magnetic Semiconductors
|
34 pages
| null |
10.1016/j.physb.2004.11.071
| null |
cond-mat.str-el cond-mat.stat-mech
| null |
Theoretical foundation and application of the generalized spin-fermion (sp-d)
exchange lattice model to magnetic and diluted magnetic semiconductors are
discussed. The capabilities of the model to describe spin quasi-particle
spectra are investigated. The main emphasis is made on the dynamic behavior of
two interacting subsystems, the localized spins and spin density of itinerant
carriers. A nonperturbative many-body approach, the Irreducible Green Functions
(IGF) method, is used to describe the quasi-particle dynamics. Scattering
states are investigated and three branches of magnetic excitations are
calculated in the regime, characteristic of a magnetic semiconductor. For a
simplified version of the model (Kondo lattice model) we study the spectra of
quasi-particle excitations with special attention given to diluted magnetic
semiconductors. For this, to include the effects of disorder, modified mean
fields are determined self-consistently. The role of the Coulomb correlation
and exchange is clarified by comparing of both the cases.
|
[{'version': 'v1', 'created': 'Wed, 10 Mar 2004 10:46:05 GMT'}]
|
2009-11-10
|
[array(['Kuzemsky', 'A. L.', ''], dtype=object)]
|
2,079 |
hep-ex/9504001
|
Daniel R. Marlow
|
C. Lu, D. Marlow, C. Mindas, E. Prebys (Princeton University)
|
First Results from the BELLE DIRC Prototype
|
17 pages, LaTeX, eps figures
| null | null |
Princeton HEP 95-2, BELLE Note #62
|
hep-ex
| null |
The DIRC (Detection of Internally Reflected Cerenkov light) is a new type of
ring imaging Cerenkov detector, which detects images from Cerenkov light
produced in precisely machined quartz bars. The Cerenkov images are transported
along several meters of bar to the edge of the detector where they are
proximity focussed unto an array of conventional photomultiplier tubes. Results
from a prototype device comprising a 2 x 4 x 240 cm**3 quartz bar read by an
array of 480 PMT's are presented. Sample images, which are the first observed
in this type of detector, are shown. Measurements of the light yield
(approximately 20 photoelectrons per image) and the angular resolution are in
good agreement with Monte Carlo predictions.
|
[{'version': 'v1', 'created': 'Wed, 5 Apr 1995 01:48:45 GMT'}]
|
2007-05-23
|
[array(['Lu', 'C.', '', 'Princeton University'], dtype=object)
array(['Marlow', 'D.', '', 'Princeton University'], dtype=object)
array(['Mindas', 'C.', '', 'Princeton University'], dtype=object)
array(['Prebys', 'E.', '', 'Princeton University'], dtype=object)]
|
2,080 |
math/0101030
|
Craig R. Guilbault
|
Craig R Guilbault
|
Manifolds with non-stable fundamental groups, at infinity
|
Published by Geometry and Topology at
http://www.maths.warwick.ac.uk/gt/GTVol4/paper19.abs.html
|
Geom. Topol. 4 (2000) 537-579
|
10.2140/gt.2000.4.537
| null |
math.GT
| null |
The notion of an open collar is generalized to that of a pseudo-collar.
Important properties and examples are discussed. The main result gives
conditions which guarantee the existence of a pseudo-collar structure on the
end of an open n-manifold (n > 6). This paper may be viewed as a generalization
of Siebenmann's famous collaring theorem to open manifolds with non-stable
fundamental group systems at infinity.
|
[{'version': 'v1', 'created': 'Thu, 4 Jan 2001 12:21:20 GMT'}]
|
2014-11-11
|
[array(['Guilbault', 'Craig R', ''], dtype=object)]
|
2,081 |
astro-ph/0508108
|
K. Werner
|
K. Werner, A.I.D. Hoffmann, D. Jahn, T. Rauch, E. Reiff, I. Traulsen,
J.W. Kruk, S. Dreizler
|
Light and heavy metal abundances in hot central stars of planetary
nebulae
|
Conf. proceedings, Gdansk 2005, Planetary Nebulae as astronomical
tools, 4 pages, 4 figures
|
AIP Conf.Proc.804:129-132,2006
|
10.1063/1.2146248
| null |
astro-ph
| null |
We present new results from our spectral analyses of very hot central stars
achieved since the last IAU Symposium on planetary nebulae held in Canberra
2001. The analyses are mainly based on UV and far-UV spectroscopy performed
with the Hubble Space Telescope and the Far Ultraviolet Spectroscopic Explorer
but also on ground-based observations performed at the Very Large Telescope and
other observatories. We report on temperature, gravity, and abundance
determinations for the CNO elements of hydrogen-rich central stars. In many
hydrogen-deficient central stars (spectral type PG1159) we discovered
particular neon and fluorine lines, which are observed for the very first time
in any astrophysical object. Their analysis strongly confirms the idea that
these stars exhibit intershell matter as a consequence of a late helium-shell
flash.
|
[{'version': 'v1', 'created': 'Wed, 3 Aug 2005 15:19:10 GMT'}]
|
2009-11-13
|
[array(['Werner', 'K.', ''], dtype=object)
array(['Hoffmann', 'A. I. D.', ''], dtype=object)
array(['Jahn', 'D.', ''], dtype=object)
array(['Rauch', 'T.', ''], dtype=object)
array(['Reiff', 'E.', ''], dtype=object)
array(['Traulsen', 'I.', ''], dtype=object)
array(['Kruk', 'J. W.', ''], dtype=object)
array(['Dreizler', 'S.', ''], dtype=object)]
|
2,082 |
2107.04498
|
Jianyin Huang
|
Jian-Yin Huang, Pei-Yun Li, Zong-Quan Zhou, Chuan-Feng Li, and
Guang-Can Guo
|
Extending the spin coherence lifetimes of
${}^{167}$Er$^{3+}$$:$Y$_2$SiO$_5$ at subkelvin temperatures
| null |
Phys. Rev. B 105, 245134 (2022)
|
10.1103/PhysRevB.105.245134
| null |
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Er$^{3+}$$:$Y$_2$SiO$_5$ is a material of particular interest due to its
suitability for telecom-band quantum memories and quantum transducers
interfacing optical communication with quantum computers working in the
microwave regime. Extending the coherence lifetimes of the electron spins and
the nuclear spins is essential for implementing efficient quantum information
processing based on such hybrid electron-nuclear spin systems. The electron
spin coherence time of Er$^{3+}$$:$Y$_2$SiO$_5$ is so far limited to several
microseconds, and there are significant challenges in optimizing coherence
lifetimes simultaneously for both the electron and nuclear spins. Here we
perform a pulsed-electron-nuclear-double-resonance investigation for an
Er$^{3+}$-doped material at subkelvin temperatures. At the lowest working
temperature, the electron spin coherence time reaches 290 $\pm$ 17 $\mu$s,
which has been enhanced by 40 times compared with the previous results. In the
subkelvin regime, a rapid increase in the nuclear spin coherence time is
observed, and the longest coherence time of 738 $\pm$ 6 $\mu$s is obtained.
These extended coherence lifetimes could be valuable resources for further
applications of Er$^{3+}$$:$Y$_2$SiO$_5$ in fiber-based quantum networks.
|
[{'version': 'v1', 'created': 'Fri, 9 Jul 2021 15:39:43 GMT'}
{'version': 'v2', 'created': 'Sat, 25 Jun 2022 08:36:33 GMT'}]
|
2022-06-28
|
[array(['Huang', 'Jian-Yin', ''], dtype=object)
array(['Li', 'Pei-Yun', ''], dtype=object)
array(['Zhou', 'Zong-Quan', ''], dtype=object)
array(['Li', 'Chuan-Feng', ''], dtype=object)
array(['Guo', 'Guang-Can', ''], dtype=object)]
|
2,083 |
2110.10143
|
Shaun Fallat
|
Shaun Fallat, Seyed Ahmad Mojallal
|
On the minimum number of distinct eigenvalues of a threshold graph
|
25 pages, 1 figrue
| null | null | null |
math.CO
|
http://creativecommons.org/licenses/by/4.0/
|
For a graph $G$, we associate a family of real symmetric matrices, $S(G)$,
where for any $A\in S(G)$, the location of the nonzero off-diagonal entries of
$A$ are governed by the adjacency structure of $G$. Let $q(G)$ be the minimum
number of distinct eigenvalues over all matrices in $S(G)$. In this work, we
give a characterization of all connected threshold graphs $G$ with $q(G)=2$.
Moreover, we study the values of $q(G)$ for connected threshold graphs with
trace $2$, $3$, $n-2$, $n-3$, where $n$ is the order of threshold graph. The
values of $q(G)$ are determined for all connected threshold graphs with $7$ and
$8$ vertices with two exceptions. Finally, a sharp upper bound for $q(G)$ over
all connected threshold graph $G$ is given.
|
[{'version': 'v1', 'created': 'Tue, 19 Oct 2021 17:49:12 GMT'}]
|
2021-10-20
|
[array(['Fallat', 'Shaun', ''], dtype=object)
array(['Mojallal', 'Seyed Ahmad', ''], dtype=object)]
|
2,084 |
1804.07032
|
Giovanni Landi
|
Michel Dubois-Violette, Xiao Han, Giovanni Landi
|
Principal fibrations over noncommutative spheres
| null | null |
10.1142/S0129055X18500204
| null |
math.QA math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present examples of noncommutative four-spheres that are base spaces of
$SU(2)$-principal bundles with noncommutative seven-spheres as total spaces.
The noncommutative coordinate algebras of the four-spheres are generated by the
entries of a projection which is invariant under the action of $SU(2)$. We give
conditions for the components of the Connes--Chern character of the projection
to vanish but the second (the top) one. The latter is then a non zero
Hochschild cycle that plays the role of the volume form for the noncommutative
four-spheres.
|
[{'version': 'v1', 'created': 'Thu, 19 Apr 2018 08:15:38 GMT'}]
|
2018-11-14
|
[array(['Dubois-Violette', 'Michel', ''], dtype=object)
array(['Han', 'Xiao', ''], dtype=object)
array(['Landi', 'Giovanni', ''], dtype=object)]
|
2,085 |
0806.0052
|
Mario Milman
|
Jan Kalis and Mario Milman
|
Symmetrization and sharp Sobolev inequalities in metric spaces
| null | null | null | null |
math.FA math.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive sharp Sobolev inequalities for Sobolev spaces on metric spaces. In
particular, we obtain new sharp Sobolev embeddings and Faber-Krahn estimates
for H\"{o}rmander vector fields.
|
[{'version': 'v1', 'created': 'Sat, 31 May 2008 03:00:08 GMT'}]
|
2008-06-03
|
[array(['Kalis', 'Jan', ''], dtype=object)
array(['Milman', 'Mario', ''], dtype=object)]
|
2,086 |
1701.01306
|
Andreas Cap
|
Andreas Cap, Tomas Salac
|
Parabolic conformally symplectic structures III; Invariant differential
operators and complexes
|
36 pages, comments are welcome v2: Small corrections; changed
references to first two parts in order to comply with new numbering in
published versions, also changed numbering of this part to a style similar to
part I
|
Doc. Math. 24 (2019) 2203-2240
|
10.25537/dm.2019v24.2203-2240
| null |
math.DG math.SG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This is the last part of a series of articles on a family of geometric
structures (PACS-structures) which all have an underlying almost conformally
symplectic structure. While the first part of the series was devoted to the
general study of these structures, the second part focused on the case that the
underlying structure is conformally symplectic (PCS-structures). In that case,
we obtained a close relation to parabolic contact structures via a concept of
parabolic contactification. It was also shown that special symplectic
connections (and thus all connections of exotic symplectic holonomy) arise as
the canonical connection of such a structure.
In this last part, we use parabolic contactifications and constructions
related to Bernstein-Gelfand-Gelfand (BGG) sequences for parabolic contact
structures, to construct sequences of differential operators naturally
associated to a PCS-structure. In particular, this gives rise to a large family
of complexes of differential operators associated to a special symplectic
connection. In some cases, large families of complexes for more general
instances of PCS-structures are obtained.
|
[{'version': 'v1', 'created': 'Thu, 5 Jan 2017 13:26:46 GMT'}
{'version': 'v2', 'created': 'Fri, 12 Jan 2018 10:30:10 GMT'}]
|
2019-11-27
|
[array(['Cap', 'Andreas', ''], dtype=object)
array(['Salac', 'Tomas', ''], dtype=object)]
|
2,087 |
1004.0929
|
Maurice Kibler
|
Maurice Robert Kibler (IPNL)
|
Bases for qudits from a nonstandard approach to SU(2)
|
From a talk presented at the 13th International Conference on
Symmetry Methods in Physics (Dubna, Russia, 6-9 July 2009) organized in
memory of Prof. Yurii Fedorovich Smirnov by the Bogoliubov Laboratory of
Theoretical Physics of the JINR and the ICAS at Yerevan State University.
|
13th International Conference on Symmetry Methods in Physics
(SYMPHYS XIII), Dubna : Russian Federation (2009)
|
10.1134/S1063778811060172
| null |
quant-ph math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Bases of finite-dimensional Hilbert spaces (in dimension d) of relevance for
quantum information and quantum computation are constructed from angular
momentum theory and su(2) Lie algebraic methods. We report on a formula for
deriving in one step the (1+p)p qupits (i.e., qudits with d = p a prime
integer) of a complete set of 1+p mutually unbiased bases in C^p. Repeated
application of the formula can be used for generating mutually unbiased bases
in C^d with d = p^e (e > or = 2) a power of a prime integer. A connection
between mutually unbiased bases and the unitary group SU(d) is briefly
discussed in the case d = p^e.
|
[{'version': 'v1', 'created': 'Tue, 6 Apr 2010 18:59:55 GMT'}]
|
2015-05-18
|
[array(['Kibler', 'Maurice Robert', '', 'IPNL'], dtype=object)]
|
2,088 |
2211.10103
|
Martin Genzel
|
Theophil Trippe and Martin Genzel and Jan Macdonald and Maximilian
M\"arz
|
Let's Enhance: A Deep Learning Approach to Extreme Deblurring of Text
Images
|
This article has been published in a revised form in Inverse Problems
and Imaging
| null |
10.3934/ipi.2023019
| null |
cs.CV cs.LG cs.NA math.NA
|
http://creativecommons.org/licenses/by/4.0/
|
This work presents a novel deep-learning-based pipeline for the inverse
problem of image deblurring, leveraging augmentation and pre-training with
synthetic data. Our results build on our winning submission to the recent
Helsinki Deblur Challenge 2021, whose goal was to explore the limits of
state-of-the-art deblurring algorithms in a real-world data setting. The task
of the challenge was to deblur out-of-focus images of random text, thereby in a
downstream task, maximizing an optical-character-recognition-based score
function. A key step of our solution is the data-driven estimation of the
physical forward model describing the blur process. This enables a stream of
synthetic data, generating pairs of ground-truth and blurry images on-the-fly,
which is used for an extensive augmentation of the small amount of challenge
data provided. The actual deblurring pipeline consists of an approximate
inversion of the radial lens distortion (determined by the estimated forward
model) and a U-Net architecture, which is trained end-to-end. Our algorithm was
the only one passing the hardest challenge level, achieving over $70\%$
character recognition accuracy. Our findings are well in line with the paradigm
of data-centric machine learning, and we demonstrate its effectiveness in the
context of inverse problems. Apart from a detailed presentation of our
methodology, we also analyze the importance of several design choices in a
series of ablation studies. The code of our challenge submission is available
under https://github.com/theophil-trippe/HDC_TUBerlin_version_1.
|
[{'version': 'v1', 'created': 'Fri, 18 Nov 2022 09:06:56 GMT'}
{'version': 'v2', 'created': 'Sun, 23 Apr 2023 11:44:02 GMT'}]
|
2023-04-25
|
[array(['Trippe', 'Theophil', ''], dtype=object)
array(['Genzel', 'Martin', ''], dtype=object)
array(['Macdonald', 'Jan', ''], dtype=object)
array(['März', 'Maximilian', ''], dtype=object)]
|
2,089 |
2203.12471
|
Alexander Smith
|
Alexander Smith, Benjamin Laubach, Ivan Castillo, Victor M. Zavala
|
Data Analysis using Riemannian Geometry and Applications to Chemical
Engineering
|
18 pages, 10 figures
| null | null | null |
stat.AP
|
http://creativecommons.org/licenses/by/4.0/
|
We explore the use of tools from Riemannian geometry for the analysis of
symmetric positive definite matrices (SPD). An SPD matrix is a versatile data
representation that is commonly used in chemical engineering (e.g.,
covariance/correlation/Hessian matrices and images) and powerful techniques are
available for its analysis (e.g., principal component analysis). A key
observation that motivates this work is that SPD matrices live on a Riemannian
manifold and that implementing techniques that exploit this basic property can
yield significant benefits in data-centric tasks such classification and
dimensionality reduction. We demonstrate this via a couple of case studies that
conduct anomaly detection in the context of process monitoring and image
analysis.
|
[{'version': 'v1', 'created': 'Wed, 23 Mar 2022 15:09:42 GMT'}]
|
2022-03-24
|
[array(['Smith', 'Alexander', ''], dtype=object)
array(['Laubach', 'Benjamin', ''], dtype=object)
array(['Castillo', 'Ivan', ''], dtype=object)
array(['Zavala', 'Victor M.', ''], dtype=object)]
|
2,090 |
1305.7004
|
Davood Asadollahi
|
Davood Asadollahi and Reza Naghipour
|
Faltings' local-global principle for the finiteness of local cohomology
modules
|
5 pages
| null | null | null |
math.AC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Let (R,m) be a complete local ring, a an ideal of R and M a finitely
generated R-module. The aim of this paper is to show that for any non-negative
integer n, the least integer i such that the i-th local cohomology with respect
to a is not in dimension <n, is equal to the n-th finiteness dimension of M
relative to a. This generalizes the main result of Quy and Brodmann-Lashgari.
|
[{'version': 'v1', 'created': 'Thu, 30 May 2013 05:10:54 GMT'}]
|
2013-05-31
|
[array(['Asadollahi', 'Davood', ''], dtype=object)
array(['Naghipour', 'Reza', ''], dtype=object)]
|
2,091 |
2006.03989
|
Jon A. Wellner
|
Nilanjana Laha, Zhen Miao, and Jon A. Wellner
|
Bi-$s^*$-Concave Distributions
|
68 pages, 24 figures; replaces and extends arXiv:2006.03989 by Laha,
Miao, and Wellner
| null | null | null |
math.ST stat.TH
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce new shape-constrained classes of distribution functions on R,
the bi-$s^*$-concave classes. In parallel to results of D\"umbgen, Kolesnyk,
and Wilke (2017) for what they called the class of bi-log-concave distribution
functions, we show that every $s$-concave density $f$ has a bi-$s^*$-concave
distribution function $F$ for $s^*\leq s/(s+1)$. Confidence bands building on
existing nonparametric bands, but accounting for the shape constraint of
bi-$s^*$-concavity, are also considered. The new bands extend those developed
by D\"umbgen et al. (2017) for the constraint of bi-log-concavity. We also make
connections between bi-$s^*$-concavity and finiteness of the Cs\"org\H{o} -
R\'ev\'esz constant of $F$ which plays an important role in the theory of
quantile processes.
|
[{'version': 'v1', 'created': 'Sat, 6 Jun 2020 22:12:51 GMT'}
{'version': 'v2', 'created': 'Fri, 9 Oct 2020 16:03:23 GMT'}]
|
2020-10-12
|
[array(['Laha', 'Nilanjana', ''], dtype=object)
array(['Miao', 'Zhen', ''], dtype=object)
array(['Wellner', 'Jon A.', ''], dtype=object)]
|
2,092 |
hep-th/9910138
|
Kazumi Okuyama
|
Kazumi Okuyama (KEK)
|
A Path Integral Representation of the Map between Commutative and
Noncommutative Gauge Fields
|
14 pages, harvmac; transformation of Wilson loop corrected, SW map at
the 2nd order corrected
|
JHEP 0003 (2000) 016
|
10.1088/1126-6708/2000/03/016
|
KEK-TH-655
|
hep-th
| null |
The world-volume theory on a D-brane in a constant B-field background can be
described by either commutative or noncommutative Yang-Mills theories. These
two descriptions correspond to two different gauge fixing of the diffeomorphism
on the brane. Comparing the boundary states in the two gauges, we derive a map
between commutative and noncommutative gauge fields in a path integral form,
when the gauge group is U(1).
|
[{'version': 'v1', 'created': 'Mon, 18 Oct 1999 11:14:07 GMT'}
{'version': 'v2', 'created': 'Mon, 27 Mar 2000 13:17:08 GMT'}
{'version': 'v3', 'created': 'Mon, 28 Aug 2000 11:20:00 GMT'}]
|
2009-10-31
|
[array(['Okuyama', 'Kazumi', '', 'KEK'], dtype=object)]
|
2,093 |
hep-ph/0411068
|
Andre Utermann
|
D. Boer, A. Brandenburg, O. Nachtmann, A. Utermann
|
Factorisation, Parton Entanglement and the Drell-Yan Process
|
14 pages, 2 figures, comments and references added; to appear in EPJC
|
Eur.Phys.J. C40 (2005) 55-61
|
10.1140/epjc/s2005-02126-0
|
DESY 04-204, HD-THEP-04-45
|
hep-ph
| null |
We discuss the angular distribution of the lepton pair in the Drell-Yan
process, hadron+hadron -> \gamma^* X -> l^+ l^- X. This process gives
information on the spin-density matrix \rho^{(q,\bar{q})} of the annihilating
quark-antiquark pair in q+\bar{q} -> l^+ l^-. There is strong experimental
evidence that even for unpolarised initial hadrons \rho^{(q,\bar{q})} is
nontrivial, and therefore the quark-antiquark system is polarised. We discuss
the possibilities of a general \rho^{(q,\bar{q})} -which could be entangled-
and a factorising \rho^{(q,\bar{q})}. We argue that instantons may lead to a
nontrivial \rho^{(q,\bar{q})} of the type indicated by experiments.
|
[{'version': 'v1', 'created': 'Thu, 4 Nov 2004 18:27:08 GMT'}
{'version': 'v2', 'created': 'Tue, 18 Jan 2005 11:55:12 GMT'}]
|
2009-11-10
|
[array(['Boer', 'D.', ''], dtype=object)
array(['Brandenburg', 'A.', ''], dtype=object)
array(['Nachtmann', 'O.', ''], dtype=object)
array(['Utermann', 'A.', ''], dtype=object)]
|
2,094 |
1709.01170
|
Giancarlo Lucchini Arteche
|
Giancarlo Lucchini Arteche
|
The unramified Brauer group of homogeneous spaces with finite stabilizer
|
19 pages, final version
|
Trans. Amer. Math. Soc. 372 (2019), 5393-5408
| null | null |
math.AG math.NT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We give formulas for calculating the unramified Brauer group of a homogeneous
space $X$ of a semisimple simply connected group $G$ with finite geometric
stabilizer $\bar F$ over a wide family of fields of characteristic 0. When $k$
is a number field, we use these formulas in order to study the Brauer-Manin
obstruction to the Hasse principle and weak approximation. We prove in
particular that the Brauer-Manin pairing is constant on $X(k_v)$ for every $v$
outside from an explicit finite set of non archimedean places of $k$.
|
[{'version': 'v1', 'created': 'Mon, 4 Sep 2017 21:30:00 GMT'}
{'version': 'v2', 'created': 'Thu, 14 Sep 2017 16:04:28 GMT'}
{'version': 'v3', 'created': 'Fri, 28 Sep 2018 22:39:43 GMT'}]
|
2020-05-12
|
[array(['Arteche', 'Giancarlo Lucchini', ''], dtype=object)]
|
2,095 |
1004.2115
|
Maxim Babenko
|
Maxim A. Babenko
|
A Faster Algorithm for the Maximum Even Factor Problem
| null | null | null | null |
math.CO cs.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Given a digraph $G = (VG,AG)$, an \emph{even factor} $M \subseteq AG$ is a
subset of arcs that decomposes into a collection of node-disjoint paths and
even cycles. Even factors in digraphs were introduced by Geleen and Cunningham
and generalize path matchings in undirected graphs. Finding an even factor of
maximum cardinality in a general digraph is known to be NP-hard but for the
class of \emph{odd-cycle symmetric} digraphs the problem is polynomially
solvable. So far, the only combinatorial algorithm known for this task is due
to Pap; it has the running time of $O(n^4)$ (hereinafter $n$ stands for the
number of nodes in $G$). In this paper we present a novel \emph{sparse
recovery} technique and devise an $O(n^3 \log n)$-time algorithm for finding a
maximum cardinality even factor in an odd-cycle symmetric digraph.
|
[{'version': 'v1', 'created': 'Tue, 13 Apr 2010 06:56:31 GMT'}
{'version': 'v2', 'created': 'Wed, 14 Apr 2010 18:29:20 GMT'}]
|
2010-04-15
|
[array(['Babenko', 'Maxim A.', ''], dtype=object)]
|
2,096 |
2205.02101
|
Dong Li
|
Qinghang Hong, Fengming Liu, Dong Li, Ji Liu, Lu Tian, Yi Shan
|
Dynamic Sparse R-CNN
|
Accepted by CVPR 2022
| null | null | null |
cs.CV cs.AI cs.LG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Sparse R-CNN is a recent strong object detection baseline by set prediction
on sparse, learnable proposal boxes and proposal features. In this work, we
propose to improve Sparse R-CNN with two dynamic designs. First, Sparse R-CNN
adopts a one-to-one label assignment scheme, where the Hungarian algorithm is
applied to match only one positive sample for each ground truth. Such
one-to-one assignment may not be optimal for the matching between the learned
proposal boxes and ground truths. To address this problem, we propose dynamic
label assignment (DLA) based on the optimal transport algorithm to assign
increasing positive samples in the iterative training stages of Sparse R-CNN.
We constrain the matching to be gradually looser in the sequential stages as
the later stage produces the refined proposals with improved precision. Second,
the learned proposal boxes and features remain fixed for different images in
the inference process of Sparse R-CNN. Motivated by dynamic convolution, we
propose dynamic proposal generation (DPG) to assemble multiple proposal experts
dynamically for providing better initial proposal boxes and features for the
consecutive training stages. DPG thereby can derive sample-dependent proposal
boxes and features for inference. Experiments demonstrate that our method,
named Dynamic Sparse R-CNN, can boost the strong Sparse R-CNN baseline with
different backbones for object detection. Particularly, Dynamic Sparse R-CNN
reaches the state-of-the-art 47.2% AP on the COCO 2017 validation set,
surpassing Sparse R-CNN by 2.2% AP with the same ResNet-50 backbone.
|
[{'version': 'v1', 'created': 'Wed, 4 May 2022 14:56:25 GMT'}]
|
2022-05-05
|
[array(['Hong', 'Qinghang', ''], dtype=object)
array(['Liu', 'Fengming', ''], dtype=object)
array(['Li', 'Dong', ''], dtype=object)
array(['Liu', 'Ji', ''], dtype=object)
array(['Tian', 'Lu', ''], dtype=object)
array(['Shan', 'Yi', ''], dtype=object)]
|
2,097 |
1403.4947
|
Daniel B. Thomas
|
Daniel B. Thomas, Marco Bruni, David Wands
|
Relativistic weak lensing from a fully non-linear cosmological density
field
|
Updated to match version published in JCAP
| null |
10.1088/1475-7516/2015/09/021
| null |
astro-ph.CO gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we examine cosmological weak lensing on non-linear scales and
show that there are Newtonian and relativistic contributions and that the
latter can also be extracted from standard Newtonian simulations. We use the
post-Friedmann formalism, a post-Newtonian type framework for cosmology, to
derive the full weak-lensing deflection angle valid on non-linear scales for
any metric theory of gravity. We show that the only contributing term that is
quadratic in the first order deflection is the expected Born correction and
lens-lens coupling term. We use this deflection angle to analyse the vector and
tensor contributions to the E- and B- mode cosmic shear power spectra. In our
approach, once the gravitational theory has been specified, the metric
components are related to the matter content in a well-defined manner.
Specifying General Relativity, we write down a complete set of equations for a
GR$+\Lambda$CDM universe for computing all of the possible lensing terms from
Newtonian N-body simulations. We illustrate this with the vector potential and
show that, in a GR$+\Lambda$CDM universe, its contribution to the E-mode is
negligible with respect to that of the conventional Newtonian scalar potential,
even on non-linear scales. Thus, under the standard assumption that Newtonian
N-body simulations give a good approximation of the matter dynamics, we show
that the standard ray tracing approach gives a good description for a
$\Lambda$CDM cosmology.
|
[{'version': 'v1', 'created': 'Wed, 19 Mar 2014 20:00:47 GMT'}
{'version': 'v2', 'created': 'Thu, 5 Nov 2015 10:53:34 GMT'}]
|
2015-11-06
|
[array(['Thomas', 'Daniel B.', ''], dtype=object)
array(['Bruni', 'Marco', ''], dtype=object)
array(['Wands', 'David', ''], dtype=object)]
|
2,098 |
cond-mat/9404005
| null |
E. R. Mucciolo, R. B. Capaz, B. L. Altshuler, and J. D. Joannopoulos
|
Manifestation of Quantum Chaos in Electronic Band Structures
|
15 pages with 6 Postscript figures included, RevTex-3, CMT-ERM/9401
| null |
10.1103/PhysRevB.50.8245
| null |
cond-mat
| null |
We use semiconductors as an example to show that quantum chaos manifests
itself in the energy spectrum of crystals. We analyze the {\it ab initio} band
structure of silicon and the tight-binding spectrum of the alloy
$Al_xGa_{1-x}As$, and show that some of their statistical properties obey the
universal predictions of quantum chaos derived from the theory of random
matrices. Also, the Bloch momenta are interpreted as external, tunable,
parameters, acting on the reduced (unit cell) Hamiltonian, in close analogy to
Aharonov-Bohm fluxes threading a torus. They are used in the investigation of
the parametric autocorrelator of crystal velocities. We find that our results
are in good agreement with the universal curves recently proposed by Simons and
coworkers.
|
[{'version': 'v1', 'created': 'Tue, 5 Apr 1994 19:39:52 GMT'}]
|
2009-10-22
|
[array(['Mucciolo', 'E. R.', ''], dtype=object)
array(['Capaz', 'R. B.', ''], dtype=object)
array(['Altshuler', 'B. L.', ''], dtype=object)
array(['Joannopoulos', 'J. D.', ''], dtype=object)]
|
2,099 |
1601.03816
|
Subhra Bhattacharya
|
Subhra Bhattacharya, S. Chakraborty
|
A Model of Emergent Universe in Inhomogeneous Space-Time
| null |
Class. Quantum Grav. 33 (2016) 035013
|
10.1088/0264-9381/33/3/035013
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A scenario of an emergent universe is constructed in the background of an
inhomogeneous space-time model which is asymptotically (at spatial infinity)
FRW space-time. The cosmic substratum consists of non-interacting two
components, namely {\bf a)} homogeneous and isotropic fluid but dissipative in
nature and {\bf b)} an inhomogeneous and anisotropic barotropic fluid. In
non-equilibrium thermodynamic prescription (second order deviations), particle
creation mechanism is considered the cause for the dissipative phenomena. It is
found that for constant value of the particle creation rate parameter there
exists a scenario of emergent universe.
|
[{'version': 'v1', 'created': 'Fri, 15 Jan 2016 05:14:50 GMT'}]
|
2016-01-18
|
[array(['Bhattacharya', 'Subhra', ''], dtype=object)
array(['Chakraborty', 'S.', ''], dtype=object)]
|
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