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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
6,800 |
hep-th/9903029
|
Alastair Paulin-Campbell
|
Robert de Mello Koch, Alastair Paulin-Campbell and Joao P. Rodrigues
|
Non-holomorphic Corrections from Threebranes in F Theory
|
23 pages, uses harvmac, References added, typos corrected and minor
improvements to discussion of N dependence, to appear in Phys. Rev. D
|
Phys.Rev. D60 (1999) 106008
|
10.1103/PhysRevD.60.106008
|
CNLS-99-02, BROWN-HET-1174
|
hep-th
| null |
We construct solutions of type IIB supergravity dual to N=2 super Yang-Mills
theories. By considering a probe moving in a background with constant coupling
and an AdS_{5} component in its geometry, we are able to reproduce the exact
low energy effective action for the theory with gauge group SU(2) and N_{f}=4
massless flavors. After turning on a mass for the flavors we find corrections
to the AdS_{5} geometry. In addition, the coupling shows a power law dependence
on the energy scale of the theory. The origin of the power law behaviour of the
coupling is traced back to instanton corrections. Instanton corrections to the
four derivative terms in the low energy effective action are correctly obtained
from a probe analysis. By considering a Wilson loop in this geometry we are
also able to compute the instanton effects on the quark-antiquark potential.
Finally we consider a solution corresponding to an asymptotically free field
theory. Again, the leading form of the four derivative terms in the low energy
effective action are in complete agreement with field theory expectations.
|
[{'version': 'v1', 'created': 'Tue, 2 Mar 1999 16:58:10 GMT'}
{'version': 'v2', 'created': 'Fri, 12 Mar 1999 07:17:10 GMT'}
{'version': 'v3', 'created': 'Tue, 17 Aug 1999 17:59:10 GMT'}]
|
2009-10-31
|
[array(['Koch', 'Robert de Mello', ''], dtype=object)
array(['Paulin-Campbell', 'Alastair', ''], dtype=object)
array(['Rodrigues', 'Joao P.', ''], dtype=object)]
|
6,801 |
1302.5540
|
Salvatore Corrente
|
Salvatore Corrente, Jos\`e Rui Figueira, Salvatore Greco
|
The SMAA-PROMETHEE methods
|
arXiv admin note: text overlap with arXiv:1211.0507
| null | null | null |
math.OC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
PROMETHEE methods are widely used in Multiple Criteria Decision Aiding (MCDA)
to deal with real decision making problems. A crucial aspect of the classical
PROMETHEE methods is the choice of criteria weights. In this paper, we propose
to apply the Stochastic Multiobjective Acceptability Analysis (SMAA) to the
classical PROMETHEE methods and to the bipolar PROMETHEE methods in order to
explore the whole set of weights compatible with some preference information
provided by the Decision Maker (DM). A didactic example describes the
application of the presented methodology to a student evaluation problem.
|
[{'version': 'v1', 'created': 'Fri, 22 Feb 2013 10:34:10 GMT'}]
|
2013-02-25
|
[array(['Corrente', 'Salvatore', ''], dtype=object)
array(['Figueira', 'Josè Rui', ''], dtype=object)
array(['Greco', 'Salvatore', ''], dtype=object)]
|
6,802 |
2211.09796
|
Christopher Eckner
|
Sascha Caron, Christopher Eckner, Luc Hendriks, Gu{\dh}laugur
J\'ohannesson, Roberto Ruiz de Austri, Gabrijela Zaharijas
|
Mind the gap: The discrepancy between simulation and reality drives
interpretations of the Galactic Center Excess
|
56 pages, 25 figures; comments welcome! Accepted for submission to
JCAP; text coincides with the published version
| null |
10.1088/1475-7516/2023/06/013
|
LAPTH-068/22
|
astro-ph.HE hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The Galactic Center Excess (GCE) in GeV gamma rays has been debated for over
a decade, with the possibility that it might be due to dark matter annihilation
or undetected point sources such as millisecond pulsars (MSPs). This study
investigates how the gamma-ray emission model ($\gamma$EM) used in Galactic
center analyses affects the interpretation of the GCE's nature. To address this
issue, we construct an ultra-fast and powerful inference pipeline based on
convolutional Deep Ensemble Networks. We explore the two main competing
hypotheses for the GCE using a set of $\gamma$EMs with increasing parametric
freedom. We calculate the fractional contribution ($f_{\mathrm{src}}$) of a dim
population of MSPs to the total luminosity of the GCE and analyze its
dependence on the complexity of the $\gamma$EM. For the simplest $\gamma$EM, we
obtain $f_{\mathrm{src}} = 0.10 \pm 0.07$, while the most complex model yields
$f_{\mathrm{src}} = 0.79 \pm 0.24.$ In conclusion, we find that the statement
about the nature of the GCE (dark matter or not) strongly depends on the
assumed $\gamma$EM. The quoted results for $f_{\mathrm{src}}$ do not account
for the additional uncertainty arising from the fact that the observed
gamma-ray sky is out-of-distribution concerning the investigated $\gamma$EM
iterations. We quantify the reality gap between our $\gamma$EMs using
deep-learning-based One-Class Deep Support Vector Data Description networks,
revealing that all employed $\gamma$EMs have gaps to reality. Our study casts
doubt on the validity of previous conclusions regarding the GCE and dark
matter, and underscores the urgent need to account for the reality gap and
consider previously overlooked ''out of domain'' uncertainties in future
interpretations.
|
[{'version': 'v1', 'created': 'Thu, 17 Nov 2022 18:58:17 GMT'}
{'version': 'v2', 'created': 'Tue, 23 May 2023 07:09:21 GMT'}]
|
2023-06-14
|
[array(['Caron', 'Sascha', ''], dtype=object)
array(['Eckner', 'Christopher', ''], dtype=object)
array(['Hendriks', 'Luc', ''], dtype=object)
array(['Jóhannesson', 'Guðlaugur', ''], dtype=object)
array(['de Austri', 'Roberto Ruiz', ''], dtype=object)
array(['Zaharijas', 'Gabrijela', ''], dtype=object)]
|
6,803 |
astro-ph/9511056
|
Rennan Bar-Kana
|
Rennan Bar-Kana (Physics Dept., MIT, Cambridge, MA)
|
Effect of Large-Scale Structure on Multiply Imaged Sources
|
Latex, 20 pages, 3 PostScript figures, to appear in ApJ Sept. 10,
1996, substantially revised
|
Astrophys.J. 468 (1996) 17
|
10.1086/177666
| null |
astro-ph
| null |
We study the effects of large-scale density fluctuations on strong
gravitational lensing. Previous studies have focused mostly on weak lensing,
since large-scale structure alone cannot produce multiple images. When a galaxy
or cluster acts as a primary lens, however, we find that large-scale structure
can produce asymmetric shear of the same order as the lens itself. Indeed, this
may explain the origin of the large shear found in lens models in conflict with
the small ellipticity of the observed galaxy light distributions. We show that
large-scale structure changes the lens equation to the form of a generalized
quadrupole lens, which affects lens reconstruction. Large-scale structure also
changes the angular diameter distance at a given redshift. The precise value
depends on the lens and source redshifts and on the large-scale structure power
spectrum, but the induced $1\sigma$ uncertainty in determinations of the Hubble
constant from measurements of time delays is of order $5-10 \%$. If
observations of lensing can constrain the magnitude of the shear which is due
to large-scale structure, it would provide a direct probe of the overall
amplitude of mass fluctuations.
|
[{'version': 'v1', 'created': 'Mon, 13 Nov 1995 21:23:26 GMT'}
{'version': 'v2', 'created': 'Mon, 1 Apr 1996 04:40:08 GMT'}]
|
2009-10-28
|
[array(['Bar-Kana', 'Rennan', '', 'Physics Dept., MIT, Cambridge, MA'],
dtype=object) ]
|
6,804 |
0903.3741
|
Alejandro Diaz-Caro
|
Pablo Arrighi (ENS-Lyon, LIP and Universite de Grenoble, LIG),
Alejandro Diaz-Caro (Universite de Grenoble, LIG, and Universite Paris-Nord,
Laboratoire LIPN)
|
A System F accounting for scalars
| null |
Logical Methods in Computer Science, Volume 8, Issue 1 (February
27, 2012) lmcs:846
|
10.2168/LMCS-8(1:11)2012
| null |
cs.LO cs.PL quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Algebraic lambda-calculus and the Linear-Algebraic lambda-calculus extend
the lambda-calculus with the possibility of making arbitrary linear
combinations of terms. In this paper we provide a fine-grained, System F-like
type system for the linear-algebraic lambda-calculus. We show that this
"scalar" type system enjoys both the subject-reduction property and the
strong-normalisation property, our main technical results. The latter yields a
significant simplification of the linear-algebraic lambda-calculus itself, by
removing the need for some restrictions in its reduction rules. But the more
important, original feature of this scalar type system is that it keeps track
of 'the amount of a type' that is present in each term. As an example of its
use, we shown that it can serve as a guarantee that the normal form of a term
is barycentric, i.e that its scalars are summing to one.
|
[{'version': 'v1', 'created': 'Sun, 22 Mar 2009 17:10:09 GMT'}
{'version': 'v2', 'created': 'Fri, 31 Jul 2009 11:19:20 GMT'}
{'version': 'v3', 'created': 'Fri, 9 Apr 2010 17:37:28 GMT'}
{'version': 'v4', 'created': 'Thu, 18 Nov 2010 11:40:41 GMT'}
{'version': 'v5', 'created': 'Sun, 24 Apr 2011 10:36:35 GMT'}
{'version': 'v6', 'created': 'Wed, 1 Feb 2012 14:40:41 GMT'}
{'version': 'v7', 'created': 'Thu, 23 Feb 2012 23:27:05 GMT'}
{'version': 'v8', 'created': 'Tue, 28 Feb 2012 08:59:44 GMT'}]
|
2015-07-01
|
[array(['Arrighi', 'Pablo', '',
'ENS-Lyon, LIP and Universite de Grenoble, LIG'], dtype=object)
array(['Diaz-Caro', 'Alejandro', '',
'Universite de Grenoble, LIG, and Universite Paris-Nord,\n Laboratoire LIPN'],
dtype=object) ]
|
6,805 |
2304.02645
|
Shonkho Shuvro Mr.
|
Shonkho Shuvro, Roopa Jayaramaiah, Rangarajan Muralidharan, Digbijoy
N. Nath, and Prosenjit Sen
|
Laser Etch Enabled Active Embedded Microfluidic Cooling in
$\beta$-Ga$_2$O$_3$
|
10 pages, 5 figures
| null | null | null |
physics.app-ph physics.soc-ph
|
http://creativecommons.org/licenses/by-sa/4.0/
|
We demonstrate active embedded microfluidic cooling in $\beta$-Ga$_2$O$_3$.
We employ a cost-effective infra-red laser etch setup to achieve controlled
etching of micro-channels in 500 um thick $\beta$-Ga$_2$O$_3$ substrate. The
micro-channels are about 210 um deep and 340 um wide. Resistive heating is used
as proof-of-concept. At a water flow rate of 50 ml/min, a 50% reduction in
surface temperature from ~140$^\circ$C to ~72$^\circ$C is achieved for 3.5 W of
input power. The experimental observations are backed by thermal simulation.
This work is expected to lead to a new paradigm in thermal management in
emerging $\beta$-Ga$_2$O$_3$ devices.
|
[{'version': 'v1', 'created': 'Sat, 18 Mar 2023 12:34:58 GMT'}]
|
2023-04-07
|
[array(['Shuvro', 'Shonkho', ''], dtype=object)
array(['Jayaramaiah', 'Roopa', ''], dtype=object)
array(['Muralidharan', 'Rangarajan', ''], dtype=object)
array(['Nath', 'Digbijoy N.', ''], dtype=object)
array(['Sen', 'Prosenjit', ''], dtype=object)]
|
6,806 |
2105.12771
|
Antonio Rotundo
|
Ben Freivogel, Dora Nikolakopoulou and Antonio F. Rotundo
|
Wormholes from Averaging over States
|
38 pages, 2 figures; v2: minor corrections added, accepted for
publication in SciPost
|
SciPost Phys. 14, 026 (2023)
|
10.21468/SciPostPhys.14.3.026
| null |
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An important question about black holes is to what extent a typical pure
state differs from the ensemble average. We show that this question can be
answered within semi-classical gravity. We focus on the quantum deviation,
which measures the fluctuations in the expectation value of an operator in an
ensemble of pure states. For a large class of ensembles and observables, these
fluctuations are calculated by a correlation function in the eternal black hole
background, which can be reliably calculated within semi-classical gravity.
This implements the idea of [arXiv:2002.02971] that wormholes can arise from
averages over states rather than theories. As an application, we calculate the
size of the long-time correlation function $\langle A(t) A(0)\rangle$.
|
[{'version': 'v1', 'created': 'Wed, 26 May 2021 18:09:31 GMT'}
{'version': 'v2', 'created': 'Mon, 21 Feb 2022 11:28:27 GMT'}]
|
2023-03-08
|
[array(['Freivogel', 'Ben', ''], dtype=object)
array(['Nikolakopoulou', 'Dora', ''], dtype=object)
array(['Rotundo', 'Antonio F.', ''], dtype=object)]
|
6,807 |
hep-ph/0604110
|
Jorge C. Romao
|
G.C.Branco, D.Emmanuel-Costa and J.C.Romao
|
Spontaneous CP Violation in a SUSY Model with a complex CKM
|
12 pages. Uses the elsart.cls LaTeX class. Minor corrections and
references added
|
Phys.Lett. B639 (2006) 661-666
|
10.1016/j.physletb.2006.06.079
| null |
hep-ph
| null |
It is pointed out that the recent measurement of the angle $\gamma$ of the
unitarity triangle, providing irrefutable evidence for a complex
Cabibbo-Kobayashi-Maskawa (CKM) matrix, presents a great challenge for
supersymmetric models with spontaneous CP violation. We construct a new minimal
extension of the minimal supersymmetric standard model (MSSM), with spontaneous
CP breaking, which leads to a complex CKM matrix, thus conforming to present
experimental data. This is achieved through the introduction of two singlet
chiral superfields and a vector-like quark chiral superfield which mixes with
the standard quarks. A $Z_3$ symmetry is introduced in order to have a
potential solution to the strong CP problem.
|
[{'version': 'v1', 'created': 'Wed, 12 Apr 2006 16:15:01 GMT'}
{'version': 'v2', 'created': 'Wed, 26 Apr 2006 14:03:54 GMT'}]
|
2010-04-05
|
[array(['Branco', 'G. C.', ''], dtype=object)
array(['Emmanuel-Costa', 'D.', ''], dtype=object)
array(['Romao', 'J. C.', ''], dtype=object)]
|
6,808 |
1503.05279
|
Kohei Hayashi
|
Kohei Hayashi and Masashi Chiba
|
A common surface-density scale for the Milky Way and Andromeda dwarf
satellites as a constraint on dark matter models
|
Typos corrected. 5 pages, 3 figures. Accepted for publication by ApJ
Letters
| null |
10.1088/2041-8205/803/1/L11
| null |
astro-ph.GA astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In an attempt to place an explicit constraint on dark matter models, we
define and estimate a mean surface density of a dark halo within a radius of
maximum circular velocity, which is derivable for various galaxies with any
dark-matter density profiles. We find that this surface density is generally
constant across a wide range of maximum circular velocities of $\sim$ 10 to 400
km s$^{-1}$, irrespective of different density distribution in each of the
galaxies. This common surface density at high halo-mass scales is found to be
naturally reproduced by both cold and warm dark matter (CDM and WDM) models,
even without employing any fitting procedures. However, the common surface
density at dwarf-galaxy scales, for which we have derived from the Milky Way
and Andromeda dwarf satellites, is reproduced only in a massive range of WDM
particle masses, whereas CDM provides a reasonable agreement with the observed
constancy. This is due to the striking difference between mass-concentration
relations for CDM and WDM halos at low halo-mass scales. In order to explain
the universal surface density of dwarf-galaxy scales in WDM models, we suggest
that WDM particles need to be heavier than 3 keV.
|
[{'version': 'v1', 'created': 'Wed, 18 Mar 2015 03:34:33 GMT'}
{'version': 'v2', 'created': 'Mon, 6 Apr 2015 07:02:56 GMT'}]
|
2015-06-24
|
[array(['Hayashi', 'Kohei', ''], dtype=object)
array(['Chiba', 'Masashi', ''], dtype=object)]
|
6,809 |
1307.4328
|
Richard Lynch
|
Peter G. Casazza, Richard G. Lynch, Janet C. Tremain, Lindsey M.
Woodland
|
Integer Frames
| null | null | null | null |
math.FA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Finite frame theory has become a powerful tool for many applications of
mathematics. In this paper we introduce a new area of research in frame theory:
Integer frames. These are frames having all integer coordinates with respect to
a fixed orthonormal basis for a Hilbert space. Integer frames have potential to
mitigate quantization errors and transmission losses as well as speeding up
computation times. This paper gives the first systematic study of this
important class of finite Hilbert space frames.
|
[{'version': 'v1', 'created': 'Tue, 16 Jul 2013 16:18:00 GMT'}
{'version': 'v2', 'created': 'Fri, 23 Oct 2015 18:46:32 GMT'}]
|
2015-10-26
|
[array(['Casazza', 'Peter G.', ''], dtype=object)
array(['Lynch', 'Richard G.', ''], dtype=object)
array(['Tremain', 'Janet C.', ''], dtype=object)
array(['Woodland', 'Lindsey M.', ''], dtype=object)]
|
6,810 |
1803.03269
|
Alexander McCormick
|
Alexander McCormick, Sylvain Veilleux, Marcio Mel\'endez, Crystal L.
Martin, Joss Bland-Hawthorn, Gerald Cecil, Fabian Heitsch, Thomas M\"uller,
David S. N. Rupke, and Chad Engelbracht
|
Exploring the Dust Content of Galactic Winds With Herschel. II. Nearby
Dwarf Galaxies
|
39 pages, 10 figures, Accepted for publication in MNRAS
| null |
10.1093/mnras/sty634
| null |
astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the results from an analysis of deep Herschel Space Observatory
observations of six nearby dwarf galaxies known to host galactic-scale winds.
The superior far-infrared sensitivity and angular resolution of Herschel have
allowed detection of cold circumgalactic dust features beyond the stellar
components of the host galaxies traced by Spitzer 4.5 $\mu$m images.
Comparisons of these cold dust features with ancillary data reveal an imperfect
spatial correlation with the ionized gas and warm dust wind components. We find
that typically $\sim$10-20\% of the total dust mass in these galaxies resides
outside of their stellar disks, but this fraction reaches $\sim$60\% in the
case of NGC 1569. This galaxy also has the largest metallicity (O/H) deficit in
our sample for its stellar mass. Overall, the small number of objects in our
sample precludes drawing strong conclusions on the origin of the circumgalactic
dust. We detect no statistically significant trends with star formation
properties of the host galaxies, as might be expected if the dust were lifted
above the disk by energy inputs from on-going star formation activity. Although
a case for dust entrained in a galactic wind is seen in NGC 1569, in all cases,
we cannot rule out the possibility that some of the circumgalactic dust might
be associated instead with gas accreted or removed from the disk by recent
galaxy interaction events, or that it is part of the outer gas-rich portion of
the disk that lies below the sensitivity limit of the Spitzer 4.5 $\mu$m data.
|
[{'version': 'v1', 'created': 'Thu, 8 Mar 2018 19:00:03 GMT'}
{'version': 'v2', 'created': 'Sat, 17 Mar 2018 23:54:59 GMT'}
{'version': 'v3', 'created': 'Wed, 4 Apr 2018 17:58:00 GMT'}]
|
2018-04-05
|
[array(['McCormick', 'Alexander', ''], dtype=object)
array(['Veilleux', 'Sylvain', ''], dtype=object)
array(['Meléndez', 'Marcio', ''], dtype=object)
array(['Martin', 'Crystal L.', ''], dtype=object)
array(['Bland-Hawthorn', 'Joss', ''], dtype=object)
array(['Cecil', 'Gerald', ''], dtype=object)
array(['Heitsch', 'Fabian', ''], dtype=object)
array(['Müller', 'Thomas', ''], dtype=object)
array(['Rupke', 'David S. N.', ''], dtype=object)
array(['Engelbracht', 'Chad', ''], dtype=object)]
|
6,811 |
gr-qc/0408059
|
Jan Metzger
|
Jan Metzger
|
Numerical computation of constant mean curvature surfaces using finite
elements
|
23 pagers, 16 figures, 5 tables. To appear in Classical and quantum
Gravity. Version with full resolution graphics available at
http://www.mathematik.uni-tuebingen.de/~jan/preprints/
|
Class.Quant.Grav. 21 (2004) 4625-4646
|
10.1088/0264-9381/21/19/010
|
AEI-2004-062
|
gr-qc
| null |
This paper presents a method for computing two-dimensional constant mean
curvature surfaces. The method in question uses the variational aspect of the
problem to implement an efficient algorithm. In principle it is a flow like
method in that it is linked to the gradient flow for the area functional, which
gives reliable convergence properties. In the background a preconditioned
conjugate gradient method works, that gives the speed of a direct elliptic
multigrid method.
|
[{'version': 'v1', 'created': 'Wed, 18 Aug 2004 12:37:58 GMT'}]
|
2009-11-10
|
[array(['Metzger', 'Jan', ''], dtype=object)]
|
6,812 |
2009.11170
|
Da Zhao
|
Eiichi Bannai, Yoshifumi Nakata, Takayuki Okuda, Da Zhao
|
Explicit construction of exact unitary designs
|
34 pages, 3 figures
| null | null | null |
math.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The purpose of this paper is to give explicit constructions of unitary
$t$-designs in the unitary group $U(d)$ for all $t$ and $d$. It seems that the
explicit constructions were so far known only for very special cases. Here
explicit construction means that the entries of the unitary matrices are given
by the values of elementary functions at the root of some given polynomials. We
will discuss what are the best such unitary $4$-designs in $U(4)$ obtained by
these methods.
Indeed we give an inductive construction of designs on compact groups by
using Gelfand pairs $(G,K)$. Note that $(U(n),U(m) \times U(n-m))$ is a Gelfand
pair. By using the zonal spherical functions for $(G,K)$, we can construct
designs on $G$ from designs on $K$.
We remark that our proofs use the representation theory of compact groups
crucially. We also remark that this method can be applied to the orthogonal
groups $O(d)$, and thus provides another explicit construction of spherical
$t$-designs on the $d$ dimensional sphere $S^{d-1}$ by the induction on $d$.
|
[{'version': 'v1', 'created': 'Wed, 23 Sep 2020 14:33:01 GMT'}]
|
2020-09-24
|
[array(['Bannai', 'Eiichi', ''], dtype=object)
array(['Nakata', 'Yoshifumi', ''], dtype=object)
array(['Okuda', 'Takayuki', ''], dtype=object)
array(['Zhao', 'Da', ''], dtype=object)]
|
6,813 |
1907.02342
|
Yurii Ignat'ev
|
Yu. G. Ignat'ev and I. A. Kokh
|
Qualitative and Numerical Analysis of a Cosmological Model Based on an
Asymmetric Scalar Doublet with Minimal Couplings. II. Numerical Modeling of
Phase Trajectories
|
7 pages, 4 figures, 2 references
|
Russian Physics Journal, Vol. 61, No. 9, 2019, pp.1590-1596
|
10.1007/s11182-018-1575-3
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
With the help of our own software package DifEqTools, numerical modeling of
the cosmological evolution of a system consisting of an asymmetric scalar
doublet of nonlinear, minimally interacting scalar fields, a classical field
and a phantom field, has been performed. Peculiarities of the behavior of the
model near zeroenergy hypersurfaces have been revealed.
|
[{'version': 'v1', 'created': 'Thu, 4 Jul 2019 11:52:29 GMT'}]
|
2019-07-05
|
[array(["Ignat'ev", 'Yu. G.', ''], dtype=object)
array(['Kokh', 'I. A.', ''], dtype=object)]
|
6,814 |
astro-ph/9905015
|
Robert E. Shirey
|
Robert E. Shirey (1), Alan M. Levine (2), Hale V. Bradt (2) ((1) UCSB,
(2) MIT)
|
Scattering and Iron Fluorescence Revealed During Absorption Dips in
Circinus X-1
|
Accepted for publication in The Astrophysical Journal (23 pages,
including 11 figures)
| null |
10.1086/307849
| null |
astro-ph
| null |
We show that dramatic spectral evolution associated with dips occurring near
phase zero in RXTE observations of Cir X-1 is well-fit by variable and at times
heavy absorption (N_H > 10^24 cm^-2) of a bright component, plus an underlying
faint component which is not attenuated by the variable column and whose flux
is ~10% of that of the unabsorbed bright component. A prominent Fe emission
line at ~6.5 keV is evident during the dips. The absolute line flux outside the
dips is similar to that during the dips, indicating that the line is associated
with the faint component. These results are consistent with a model in which
the bright component is radiation received directly from a compact source while
the faint component may be attributed to scattered radiation. Our results are
also generally consistent with those of Brandt et al., who found that a
partial- covering model could explain ASCA spectra of a low-to-high transition
in Cir X-1. The relative brightness of the two components in our model requires
a column density of ~2*10^23 cm^-2 if the faint component is due to Thomson
scattering in material that mostly surrounds the source. We find that
illumination of such a scattering cloud by the observed direct component would
produce an Fe K-alpha fluorescence flux that is in rough agreement with the
flux of the observed emission line. We also conclude that if the scattering
medium is not highly ionized, our line of sight to the compact source does not
pass through it. Finally, we discuss simple pictures of the absorbers
responsible for the dips themselves.
|
[{'version': 'v1', 'created': 'Mon, 3 May 1999 20:49:34 GMT'}]
|
2009-10-31
|
[array(['Shirey', 'Robert E.', ''], dtype=object)
array(['Levine', 'Alan M.', ''], dtype=object)
array(['Bradt', 'Hale V.', ''], dtype=object)]
|
6,815 |
1705.09796
|
Cristina Turcu
|
Valentin Vlad, Adrian Graur, Cristina Elena Turcu, Calin Ciufudean
|
Studiu de caz privind utilizarea modelelor IEC 61499 in controlul
holonic de nivel inalt
|
7th International Conference on Microelectronics and Computer
Science, Chisinau, Republic of Moldova, September 22-24, 2011
| null | null | null |
cs.SY
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper presents various solutions for applying the specifications of the
IEC 61499 standard in order to modeling and implementing applications of holons
control.
|
[{'version': 'v1', 'created': 'Sat, 27 May 2017 09:40:52 GMT'}]
|
2017-05-30
|
[array(['Vlad', 'Valentin', ''], dtype=object)
array(['Graur', 'Adrian', ''], dtype=object)
array(['Turcu', 'Cristina Elena', ''], dtype=object)
array(['Ciufudean', 'Calin', ''], dtype=object)]
|
6,816 |
cond-mat/0608513
|
Jens Christian Claussen
|
Jens Christian Claussen, J\"urgen Carstensen, Marc Christophersen,
Sergiu Langa, and Helmut F\"oll (University Kiel)
|
Self-organized pore formation and open-loop-control in semiconductor
etching
| null |
CHAOS (AIP) 13 (1), 217-224 (2003)
|
10.1063/1.1497835
| null |
cond-mat.mtrl-sci cond-mat.dis-nn
| null |
Electrochemical etching of semiconductors, apart from many technical
applications, provides an interesting experimental setup for self-organized
structure formation capable e.g. of regular, diameter-modulated, and branching
pores. The underlying dynamical processes governing current transfer and
structure formation are described by the Current-Burst-Model: all dissolution
processes are assumed to occur inhomogeneously in time and space as a Current
Burst (CB); the properties and interactions between CB's are described by a
number of material- and chemistry- dependent ingredients, like passivation and
aging of surfaces in different crystallographic orientations, giving a
qualitative understanding of resulting pore morphologies. These morphologies
cannot be influenced only by the current, by chemical, material and other
etching conditions, but also by an open-loop control, triggering the time scale
given by the oxide dissolution time. With this method, under conditions where
only branching pores occur, the additional signal hinders side pore formation
resulting in regular pores with modulated diameter.
|
[{'version': 'v1', 'created': 'Wed, 23 Aug 2006 19:17:46 GMT'}]
|
2007-05-23
|
[array(['Claussen', 'Jens Christian', '', 'University Kiel'], dtype=object)
array(['Carstensen', 'Jürgen', '', 'University Kiel'], dtype=object)
array(['Christophersen', 'Marc', '', 'University Kiel'], dtype=object)
array(['Langa', 'Sergiu', '', 'University Kiel'], dtype=object)
array(['Föll', 'Helmut', '', 'University Kiel'], dtype=object)]
|
6,817 |
2306.13273
|
Tao Li
|
Henger Li, Tianyi Xu, Tao Li, Yunian Pan, Quanyan Zhu, Zizhan Zheng
|
A First Order Meta Stackelberg Method for Robust Federated Learning
(Technical Report)
|
Accepted to ICML 2023 Workshop on The 2nd New Frontiers In
Adversarial Machine Learning. Workshop Proceedings version: arXiv:2306.13800
| null | null | null |
cs.CR cs.GT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent research efforts indicate that federated learning (FL) systems are
vulnerable to a variety of security breaches. While numerous defense strategies
have been suggested, they are mainly designed to counter specific attack
patterns and lack adaptability, rendering them less effective when facing
uncertain or adaptive threats. This work models adversarial FL as a Bayesian
Stackelberg Markov game (BSMG) between the defender and the attacker to address
the lack of adaptability to uncertain adaptive attacks. We further devise an
effective meta-learning technique to solve for the Stackelberg equilibrium,
leading to a resilient and adaptable defense. The experiment results suggest
that our meta-Stackelberg learning approach excels in combating intense model
poisoning and backdoor attacks of indeterminate types.
|
[{'version': 'v1', 'created': 'Fri, 23 Jun 2023 02:58:00 GMT'}
{'version': 'v2', 'created': 'Sat, 1 Jul 2023 16:13:10 GMT'}]
|
2023-07-04
|
[array(['Li', 'Henger', ''], dtype=object)
array(['Xu', 'Tianyi', ''], dtype=object)
array(['Li', 'Tao', ''], dtype=object)
array(['Pan', 'Yunian', ''], dtype=object)
array(['Zhu', 'Quanyan', ''], dtype=object)
array(['Zheng', 'Zizhan', ''], dtype=object)]
|
6,818 |
0904.1389
|
Lyubomyr Zdomskyy
|
Taras Banakh, Du\v{s}an Repov\v{s}, Lyubomyr Zdomskyy
|
o-Boundedness of free topological groups
|
24 pages, submitted
|
Topology and Its Applications 157:2 (2010), 466-481.
|
10.1016/j.topol.2009.10.006
| null |
math.GN
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Assuming the absence of Q-points (which is consistent with ZFC) we prove that
the free topological group $F(X)$ over a Tychonov space $X$ is $o$-bounded if
and only if every continuous metrizable image $T$ of $X$ satisfies the
selection principle $U_{fin}(O,\Omega)$ (the latter means that for every
sequence $<u_n>_{n\in w}$ of open covers of $T$ there exists a sequence
$<v_n>_{n\in w}$ such that $v_n\in [u_n]^{<w}$ and for every $F\in [X]^{<w}$
there exists $n\in w$ with $F\subset\cup v_n$). This characterization gives a
consistent answer to a problem posed by C. Hernandes, D. Robbie, and M.
Tkachenko in 2000.
|
[{'version': 'v1', 'created': 'Wed, 8 Apr 2009 17:35:23 GMT'}]
|
2009-11-05
|
[array(['Banakh', 'Taras', ''], dtype=object)
array(['Repovš', 'Dušan', ''], dtype=object)
array(['Zdomskyy', 'Lyubomyr', ''], dtype=object)]
|
6,819 |
1501.06163
|
Yongsheng Zhang
|
Yongsheng Zhang
|
On Extending Calibrations
|
10 pages, 6 figures, comments are welcome
| null | null | null |
math.DG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This is a companion note of [Zhaa] (arXiv:1501.01836) where the extension of
local calibration pairs of smooth submanifolds is discussed. Here we emphasize
on the case of singular submanifolds. More precisely, we study when a
calibration pair around the singular set of a submanifold can extend to a local
calibration pair about the entire submanifold. Based upon [Zhab]
(arXiv:1501.04681) several examples of particular interests under the view of
calibrated geometry are considered.
|
[{'version': 'v1', 'created': 'Sun, 25 Jan 2015 14:18:53 GMT'}]
|
2015-01-27
|
[array(['Zhang', 'Yongsheng', ''], dtype=object)]
|
6,820 |
1501.01083
|
Mohana S H
|
S.H. Mohana, C.J. Prabhakar
|
Stem-Calyx Recognition of an Apple using Shape Descriptors
|
15 pages, 10 figures and 2 tables in Signal & Image Processing : An
International Journal (SIPIJ) Vol.5, No.6, December 2014
| null |
10.5121/sipij.2014.5602
| null |
cs.CV
|
http://creativecommons.org/licenses/by-nc-sa/3.0/
|
This paper presents a novel method to recognize stem - calyx of an apple
using shape descriptors. The main drawback of existing apple grading techniques
is that stem - calyx part of an apple is treated as defects, this leads to poor
grading of apples. In order to overcome this drawback, we proposed an approach
to recognize stem-calyx and differentiated from true defects based on shape
features. Our method comprises of steps such as segmentation of apple using
grow-cut method, candidate objects such as stem-calyx and small defects are
detected using multi-threshold segmentation. The shape features are extracted
from detected objects using Multifractal, Fourier and Radon descriptor and
finally stem-calyx regions are recognized and differentiated from true defects
using SVM classifier. The proposed algorithm is evaluated using experiments
conducted on apple image dataset and results exhibit considerable improvement
in recognition of stem-calyx region compared to other techniques.
|
[{'version': 'v1', 'created': 'Tue, 6 Jan 2015 05:51:23 GMT'}]
|
2015-01-07
|
[array(['Mohana', 'S. H.', ''], dtype=object)
array(['Prabhakar', 'C. J.', ''], dtype=object)]
|
6,821 |
2212.13626
|
Erich Schubert
|
Daniel Boiar and Thomas Liebig and Erich Schubert
|
LOSDD: Leave-Out Support Vector Data Description for Outlier Detection
| null | null | null | null |
cs.LG stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Support Vector Machines have been successfully used for one-class
classification (OCSVM, SVDD) when trained on clean data, but they work much
worse on dirty data: outliers present in the training data tend to become
support vectors, and are hence considered "normal". In this article, we improve
the effectiveness to detect outliers in dirty training data with a leave-out
strategy: by temporarily omitting one candidate at a time, this point can be
judged using the remaining data only. We show that this is more effective at
scoring the outlierness of points than using the slack term of existing
SVM-based approaches. Identified outliers can then be removed from the data,
such that outliers hidden by other outliers can be identified, to reduce the
problem of masking. Naively, this approach would require training N individual
SVMs (and training $O(N^2)$ SVMs when iteratively removing the worst outliers
one at a time), which is prohibitively expensive. We will discuss that only
support vectors need to be considered in each step and that by reusing SVM
parameters and weights, this incremental retraining can be accelerated
substantially. By removing candidates in batches, we can further improve the
processing time, although it obviously remains more costly than training a
single SVM.
|
[{'version': 'v1', 'created': 'Tue, 27 Dec 2022 21:43:16 GMT'}]
|
2022-12-29
|
[array(['Boiar', 'Daniel', ''], dtype=object)
array(['Liebig', 'Thomas', ''], dtype=object)
array(['Schubert', 'Erich', ''], dtype=object)]
|
6,822 |
0903.0998
|
Ma Luo
|
Ma Luo, Chengguang Bao, Zhibing Li
|
Modification of spin mixing of spinor BEC by cavity QED coupling
|
5 pages, 1 figure
| null | null | null |
physics.atm-clus physics.optics
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Dressed states of spinor Bose-Einstein condensates of spin-1 atoms coupling
with optical cavity modes with far off resonance frequency are investigated.
The exact solution of time evolution of population of spin component is
derived, and the numerical result shows that the evolution is different from
spin mixing without the coupling. Due to the coupling with the atoms, the
photon state also evolute to different optical cavity modes.
|
[{'version': 'v1', 'created': 'Thu, 5 Mar 2009 02:32:14 GMT'}]
|
2009-03-06
|
[array(['Luo', 'Ma', ''], dtype=object)
array(['Bao', 'Chengguang', ''], dtype=object)
array(['Li', 'Zhibing', ''], dtype=object)]
|
6,823 |
2206.12355
|
Adrian van Kan
|
Adrian van Kan, Benjamin Favier, Keith Julien and Edgar Knobloch
|
Spontaneous suppression of inverse energy cascade in instability-driven
2D turbulence
| null | null |
10.1017/jfm.2022.935
| null |
physics.flu-dyn physics.ao-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Instabilities of fluid flows often generate turbulence. Using extensive
direct numerical simulations, we study two-dimensional turbulence driven by a
wavenumber-localised instability superposed on stochastic forcing, in contrast
to previous studies of state-independent forcing. As the contribution of the
instability forcing, measured by a parameter $\gamma$, increases, the system
undergoes two transitions. For $\gamma$ below a first threshold, a regular
large-scale vortex condensate forms. Above this threshold, shielded vortices
(SVs) emerge within the condensate. At a second, larger value of $\gamma$, the
condensate breaks down, and a gas of weakly interacting vortices with broken
symmetry spontaneously emerges, characterised by preponderance of vortices of
one sign only and suppressed inverse energy cascade. The latter transition is
shown to depend on the damping mechanism. The number density of SVs in the
broken symmetry state slowly increases via a random nucleation process.
Bistability is observed between the condensate and mixed SV-condensate states.
Our findings provide new evidence for a strong dependence of two-dimensional
turbulence phenomenology on the forcing.
|
[{'version': 'v1', 'created': 'Fri, 24 Jun 2022 16:01:35 GMT'}
{'version': 'v2', 'created': 'Tue, 8 Nov 2022 08:32:51 GMT'}]
|
2022-12-14
|
[array(['van Kan', 'Adrian', ''], dtype=object)
array(['Favier', 'Benjamin', ''], dtype=object)
array(['Julien', 'Keith', ''], dtype=object)
array(['Knobloch', 'Edgar', ''], dtype=object)]
|
6,824 |
1708.04110
|
Victor Doroshenko
|
V. Doroshenko, G. P\"uhlhofer, A. Bamba, F. Acero, W. W. Tian, D.
Klochkov, and A. Santangelo
|
XMM-Newton observations of the non-thermal supernova remnant HESS
J1731-347 (G353.6-0.7)
|
11 pages, accepted in A&A
| null |
10.1051/0004-6361/201730983
| null |
astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report on the analysis of XMM-Newton observations of the non-thermal
shell-type supernova remnant HESS J1731-347 (G353.6-0.7). For the first time
the complete remnant shell has been covered in X-rays, which allowed direct
comparison with radio and TeV observations. We carried out a spatially resolved
spectral analysis of XMM-Newton data and confirmed the previously reported
non-thermal power-law X-ray spectrum of the source with negligible variations
of spectral index across the shell. On the other hand, the X-ray absorption
column is strongly variable and correlates with the CO emission thus confirming
that the absorbing material must be in the foreground and reinforcing the
previously suggested lower limit on distance. Finally, we find that the X-ray
emission of the remnant is suppressed towards the Galactic plane, which points
to lower shock velocities in this region, likely due to the interaction of the
shock with the nearby molecular cloud.
|
[{'version': 'v1', 'created': 'Mon, 14 Aug 2017 13:16:23 GMT'}]
|
2017-08-15
|
[array(['Doroshenko', 'V.', ''], dtype=object)
array(['Pühlhofer', 'G.', ''], dtype=object)
array(['Bamba', 'A.', ''], dtype=object)
array(['Acero', 'F.', ''], dtype=object)
array(['Tian', 'W. W.', ''], dtype=object)
array(['Klochkov', 'D.', ''], dtype=object)
array(['Santangelo', 'A.', ''], dtype=object)]
|
6,825 |
gr-qc/0107041
|
Dr Henk van Elst
|
Henk van Elst (Queen Mary, London), Claes Uggla (University of
Karlstad), John Wainwright (University of Waterloo)
|
Dynamical systems approach to G2 cosmology
|
28 pages, 3 tables, 1 *.eps figure, LaTeX2e (10pt), matches version
accepted for publication by Classical and Quantum Gravity
|
Class.Quant.Grav. 19 (2002) 51-82
|
10.1088/0264-9381/19/1/304
|
QMUL-AU-2001-008, ESI 1057 (2001)
|
gr-qc
| null |
In this paper we present a new approach for studying the dynamics of
spatially inhomogeneous cosmological models with one spatial degree of freedom.
By introducing suitable scale-invariant dependent variables we write the
evolution equations of the Einstein field equations as a system of autonomous
partial differential equations in first-order symmetric hyperbolic format,
whose explicit form depends on the choice of gauge. As a first application, we
show that the asymptotic behaviour near the cosmological initial singularity
can be given a simple geometrical description in terms of the local past
attractor on the boundary of the scale-invariant dynamical state space. The
analysis suggests the name ``asymptotic silence'' to describe the evolution of
the gravitational field near the cosmological initial singularity.
|
[{'version': 'v1', 'created': 'Wed, 11 Jul 2001 15:21:38 GMT'}
{'version': 'v2', 'created': 'Fri, 9 Nov 2001 16:02:52 GMT'}]
|
2009-11-07
|
[array(['van Elst', 'Henk', '', 'Queen Mary, London'], dtype=object)
array(['Uggla', 'Claes', '', 'University of\n Karlstad'], dtype=object)
array(['Wainwright', 'John', '', 'University of Waterloo'], dtype=object)]
|
6,826 |
2211.15910
|
Wang Liu
|
Wang Liu, Cunhua Pan, Hong Ren, Feng Shu, Shi Jin, and Jiangzhou Wang
|
Low-overhead Beam Training Scheme for Extremely Large-Scale RIS in
Near-field
|
This paper has been submitted to IEEE journal. (RIS, Near-field,
extremely large-scale RIS, beam training, deep residual learning)
| null | null | null |
cs.IT eess.SP math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Extremely large-scale reconfigurable intelligent surface (XL-RIS) has
recently been proposed and is recognized as a promising technology that can
further enhance the capacity of communication systems and compensate for severe
path loss . However, the pilot overhead of beam training in XL-RIS-assisted
wireless communication systems is enormous because the near-field channel model
needs to be taken into account, and the number of candidate codewords in the
codebook increases dramatically accordingly. To tackle this problem, we propose
two deep learning-based near-field beam training schemes in XL-RIS-assisted
communication systems, where deep residual networks are employed to determine
the optimal near-field RIS codeword. Specifically, we first propose a far-field
beam-based beam training (FBT) scheme in which the received signals of all
far-field RIS codewords are fed into the neural network to estimate the optimal
near-field RIS codeword. In order to further reduce the pilot overhead, a
partial near-field beam-based beam training (PNBT) scheme is proposed, where
only the received signals corresponding to the partial near-field XL-RIS
codewords are served as input to the neural network. Moreover, we further
propose an improved PNBT scheme to enhance the performance of beam training by
fully exploring the neural network's output. Finally, simulation results show
that the proposed schemes outperform the existing beam training schemes and can
reduce the beam sweeping overhead by approximately 95%.
|
[{'version': 'v1', 'created': 'Tue, 29 Nov 2022 03:58:21 GMT'}
{'version': 'v2', 'created': 'Wed, 30 Nov 2022 07:55:28 GMT'}]
|
2022-12-01
|
[array(['Liu', 'Wang', ''], dtype=object)
array(['Pan', 'Cunhua', ''], dtype=object)
array(['Ren', 'Hong', ''], dtype=object)
array(['Shu', 'Feng', ''], dtype=object)
array(['Jin', 'Shi', ''], dtype=object)
array(['Wang', 'Jiangzhou', ''], dtype=object)]
|
6,827 |
2201.03331
|
Christian Ponte-Fern\'andez
|
Christian Ponte-Fern\'andez (1), Jorge Gonz\'alez-Dom\'inguez (1) and
Mar\'ia J. Mart\'in (1) ((1) Universidade da Coru\~na, CITIC, Computer
Architecture Group, A Coru\~na, Spain)
|
Fiuncho: a program for any-order epistasis detection in CPU clusters
|
Submitted to The Journal of Supercomputing. Source code available at
https://github.com/UDC-GAC/fiuncho
| null | null | null |
cs.DC cs.CE
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
Epistasis can be defined as the statistical interaction of genes during the
expression of a phenotype. It is believed that it plays a fundamental role in
gene expression, as individual genetic variants have reported a very small
increase in disease risk in previous Genome-Wide Association Studies. The most
successful approach to epistasis detection is the exhaustive method, although
its exponential time complexity requires a highly parallel implementation in
order to be used. This work presents Fiuncho, a program that exploits all
levels of parallelism present in \textit{x86\_64} CPU clusters in order to
mitigate the complexity of this approach. It supports epistasis interactions of
any order, and when compared with other exhaustive methods, it is on average
358, 7 and 3 times faster than MDR, MPI3SNP and BitEpi, respectively.
|
[{'version': 'v1', 'created': 'Mon, 10 Jan 2022 13:19:31 GMT'}
{'version': 'v2', 'created': 'Mon, 7 Mar 2022 16:22:12 GMT'}
{'version': 'v3', 'created': 'Tue, 8 Mar 2022 17:07:11 GMT'}]
|
2022-03-09
|
[array(['Ponte-Fernández', 'Christian', ''], dtype=object)
array(['González-Domínguez', 'Jorge', ''], dtype=object)
array(['Martín', 'María J.', ''], dtype=object)]
|
6,828 |
1709.01269
|
Michael Thies
|
Michael Thies
|
Untwisting twisted NJL$_2$-kinks by a bare fermion mass
|
12 pages, 8 figures; v2: typo in caption of Fig. 3 corrected
|
Phys. Rev. D 96, 116018 (2017)
|
10.1103/PhysRevD.96.116018
| null |
hep-th cond-mat.str-el hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Twisted kinks in the massless NJL$_2$ model interpolate between two distinct
vacua on the chiral circle. If one approaches the chiral limit from finite bare
fermion masses $m_0$, the vacuum is unique and twist cannot exist. This issue
is studied analytically in the non-relativistic limit, using a no-sea effective
theory. We conclude that even in the massless limit, the interpretation of the
twisted kink has to be revised. One has to attribute the fermion number of the
valence state to the twisted kink. Fermion density is spread out over the whole
space due to the massless pion field. The result can be pictured as a composite
of a twisted kink (carrying energy, but no fermion number) and a partial
winding of the chiral spiral (carrying fermion number, but no energy). This
solves at the same time the puzzle of missing baryons with fermion number
$N_f<N$ in the massless NJL$_2$ model.
|
[{'version': 'v1', 'created': 'Tue, 5 Sep 2017 07:49:57 GMT'}
{'version': 'v2', 'created': 'Mon, 25 Sep 2017 14:17:05 GMT'}]
|
2018-01-03
|
[array(['Thies', 'Michael', ''], dtype=object)]
|
6,829 |
2011.05077
|
Yang Lei
|
Y. Lei, Y. Lu, and Y. M. Zhao
|
Nucleon-pair approximation with matrix representation
|
11 pages, 2 figures
| null |
10.1088/1674-1137/abe3ed
| null |
nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
In this paper, we propose an approach of the nucleon-pair approximation
(NPA), in which the collective nucleon pairs are represented in terms of
antisymmetric matrices, and commutations between nucleon pairs are given by
using matrix multiplication that avoids angular-momentum couplings and
recouplings. Therefore the present approach significantly simplifies the NPA
computation. Furthermore, it is formulated on the same footing with and without
isospin.
|
[{'version': 'v1', 'created': 'Tue, 10 Nov 2020 13:01:19 GMT'}]
|
2021-05-26
|
[array(['Lei', 'Y.', ''], dtype=object)
array(['Lu', 'Y.', ''], dtype=object)
array(['Zhao', 'Y. M.', ''], dtype=object)]
|
6,830 |
2211.05323
|
Fan Zhang
|
Fan Zhang, Weiwei Gao, Greis J. Cruz, Yi-yang Sun, Peihong Zhang,
Jijun Zhao
|
Giant excitonic effects in bulk vacancy-ordered double perovskites
| null | null |
10.1103/PhysRevB.107.235119
| null |
physics.comp-ph cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using first-principles GW plus Bethe-Salpeter equation calculations, we
identify anomalously strong excitonic effects in several vacancy-ordered double
perovskites Cs2MX6 (M = Ti, Zr; X = I, Br). Giant exciton binding energies
about 1 eV are found in these moderate-gap, inorganic bulk semiconductors,
pushing the limit of our understanding of electron-hole (e-h) interaction and
exciton formation in solids. Not only are the exciton binding energies
extremely large compared with any other moderate-gap bulk semiconductors, but
they are also larger than typical 2D semiconductors with comparable
quasiparticle gaps. Our calculated lowest bright exciton energy agrees well
with the experimental optical band gap. The low-energy excitons closely
resemble the Frenkel excitons in molecular crystals, as they are highly
localized in a single [MX6]2- octahedron and extended in the reciprocal space.
The weak dielectric screening effects and the nearly flat frontier electronic
bands, which are derived from the weakly bonded [MX6]2- units, together explain
the significant excitonic effects. Spin-orbit coupling effects play a crucial
role in red-shifting the lowest bright exciton by mixing up spin-singlet and
spin-triplet excitons, while exciton-phonon coupling effects have minor impacts
on the strong exciton binding energies.
|
[{'version': 'v1', 'created': 'Thu, 10 Nov 2022 04:00:55 GMT'}]
|
2023-06-21
|
[array(['Zhang', 'Fan', ''], dtype=object)
array(['Gao', 'Weiwei', ''], dtype=object)
array(['Cruz', 'Greis J.', ''], dtype=object)
array(['Sun', 'Yi-yang', ''], dtype=object)
array(['Zhang', 'Peihong', ''], dtype=object)
array(['Zhao', 'Jijun', ''], dtype=object)]
|
6,831 |
2209.05076
|
Lubos Bician
|
NA62 Collaboration
|
A measurement of the $K^{+} \to \pi^{+} \mu^{+} \mu^{-}$ decay
|
17 pages, 5 figures. Updated version (6 October 2022) accepted for
publication in JHEP
|
JHEP 11 (2022) 011, 2022
|
10.1007/JHEP11(2022)011
|
CERN-EP-2022-189
|
hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
A sample of $2.8 \times 10^4$ $K^{+} \to \pi^{+} \mu^{+} \mu^{-}$ candidates
with negligible background was collected by the NA62 experiment at the CERN SPS
in 2017--2018. The model-independent branching fraction is measured to be
$(9.15 \pm 0.08)\times 10^{-8}$, a factor three more precise than previous
measurements. The decay form factor is presented as a function of the squared
dimuon mass. A measurement of the form factor parameters and their
uncertainties is performed using a description based on Chiral Perturbation
Theory at $\mathcal{O}(p^6)$.
|
[{'version': 'v1', 'created': 'Mon, 12 Sep 2022 08:26:51 GMT'}
{'version': 'v2', 'created': 'Thu, 6 Oct 2022 15:00:08 GMT'}
{'version': 'v3', 'created': 'Wed, 16 Nov 2022 20:44:20 GMT'}]
|
2022-11-18
|
[array(['NA62 Collaboration', '', ''], dtype=object)]
|
6,832 |
2202.12699
|
Hanxiao Wang
|
Jingrui Sun, Hanxiao Wang and Jiongmin Yong
|
Turnpike Properties for Stochastic Linear-Quadratic Optimal Control
Problems
| null | null | null | null |
math.OC
|
http://creativecommons.org/licenses/by/4.0/
|
This paper analyzes the limiting behavior of stochastic linear-quadratic
optimal control problems in finite time horizon $[0,T]$ as
$T\rightarrow\infty$. The so-called turnpike properties are established for
such problems, under stabilizability condition which is weaker than the
controllability, normally imposed in the similar problem for ordinary
differential systems. In dealing with the turnpike problem, a crucial issue is
to determine the corresponding static optimization problem. Intuitively
mimicking deterministic situations, it seems to be natural to include both the
drift and the diffusion as constraints in the static optimization problem.
However, this would lead us to a wrong direction. It is found that the correct
static problem should contain the diffusion as a part of the objective
function, which reveals a deep feature of the stochastic turnpike problem.
|
[{'version': 'v1', 'created': 'Fri, 25 Feb 2022 13:55:29 GMT'}]
|
2022-02-28
|
[array(['Sun', 'Jingrui', ''], dtype=object)
array(['Wang', 'Hanxiao', ''], dtype=object)
array(['Yong', 'Jiongmin', ''], dtype=object)]
|
6,833 |
astro-ph/0512115
|
Andrew Prentice
|
A. J. R. Prentice
|
Saturn's Icy Moon Rhea: a Prediction for Bulk Chemical Composition and
Physical Structure at the Time of the Cassini Spacecraft First Flyby
|
This paper was submitted to the Publications of the Astronomical
Society of Australia (PASA) on 30 November 2005
| null |
10.1071/AS05041
| null |
astro-ph
| null |
I report a model for the formation of Saturn's family of mid-sized icy moons
to coincide with the first flypast of Rhea by the Cassini Orbiter spacecraft on
26 November 2005. It is proposed that these moons had condensed from a
concentric family of orbiting gas rings that were cast off some 4600 Myr ago by
the contracting proto-Saturnian cloud. Numerical and structural models for Rhea
are constructed on the basis of a computed bulk chemical mix of hydrated rock
(mass fraction 0.385), H2O ice (0.395), and NH3 ice (0.220). The large
proportion of NH3 in the ice mass inhibits the formation of the dense
crystalline phase II of H2O ice at the satellite's centre. This may explain the
absence of compressional features on the surface. The favoured model of Rhea
has a chemically uniform interior and is very cold. The satellite is nearly
isodense and the predicted value of the axial moment-of-inertia factor is
C/MR^2 = 0.399 +/- 0.004. NH3 is unstable at Saturn's distance from the Sun,
except near the polar regions of the satellite. Perhaps the Cassini Orbiter
will discover indirect evidence for NH3 through the sublimative escape of this
ice from the outer layers, especially near the equatorial zones. Wasting of NH3
would weaken the residual soil, so making the edges of craters soft and prone
to landslides. It will be exciting to learn what Cassini discovers.
|
[{'version': 'v1', 'created': 'Mon, 5 Dec 2005 18:01:40 GMT'}]
|
2009-11-11
|
[array(['Prentice', 'A. J. R.', ''], dtype=object)]
|
6,834 |
1001.2876
|
Adi Jarden
|
Adi Jarden and Alon Sitton
|
Independence of Sets Without Stability
|
32 pages
| null | null | null |
math.LO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We presents an independence relation on sets, one can define dimension by it,
assuming that we have an abstract elementary class with a forking notion that
satisfies the axioms of a good frame minus stability.
|
[{'version': 'v1', 'created': 'Sun, 17 Jan 2010 07:12:32 GMT'}
{'version': 'v2', 'created': 'Wed, 18 May 2011 14:55:32 GMT'}]
|
2011-05-19
|
[array(['Jarden', 'Adi', ''], dtype=object)
array(['Sitton', 'Alon', ''], dtype=object)]
|
6,835 |
1707.09553
|
James P. Crutchfield
|
C. Aghamohammadi, S. P. Loomis, J. R. Mahoney, and J. P. Crutchfield
|
Extreme Quantum Advantage for Rare-Event Sampling
|
11 pages, 9 figures;
http://csc.ucdavis.edu/~cmg/compmech/pubs/eqafbs.htm
|
Phys. Rev. X 8, 011025 (2018)
|
10.1103/PhysRevX.8.011025
| null |
quant-ph cond-mat.stat-mech cs.CC cs.IT math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce a quantum algorithm for efficient biased sampling of the rare
events generated by classical memoryful stochastic processes. We show that this
quantum algorithm gives an extreme advantage over known classical biased
sampling algorithms in terms of the memory resources required. The quantum
memory advantage ranges from polynomial to exponential and when sampling the
rare equilibrium configurations of spin systems the quantum advantage diverges.
|
[{'version': 'v1', 'created': 'Sat, 29 Jul 2017 20:10:59 GMT'}]
|
2018-02-21
|
[array(['Aghamohammadi', 'C.', ''], dtype=object)
array(['Loomis', 'S. P.', ''], dtype=object)
array(['Mahoney', 'J. R.', ''], dtype=object)
array(['Crutchfield', 'J. P.', ''], dtype=object)]
|
6,836 |
1212.2904
|
Filipe Moura
|
Filipe Moura
|
Tensorial perturbations and stability of spherically symmetric
d-dimensional black holes in string theory
|
20 pages. Includes results originally published in arXiv:1105.5074v1,
but removed from arXiv:1105.5074v2. v2: references added. Published version
|
Phys. Rev. D87, 044036 (2013)
|
10.1103/PhysRevD.87.044036
| null |
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We compute the tensorial perturbations to a general spherically symmetric
metric in d dimensions with string-theoretical corrections quadratic in the
Riemann tensor, from which we derive their respective potential. We use this
result to study the stability of corresponding black hole solutions under such
perturbations.
|
[{'version': 'v1', 'created': 'Wed, 12 Dec 2012 17:59:51 GMT'}
{'version': 'v2', 'created': 'Fri, 1 Mar 2013 18:14:02 GMT'}]
|
2013-03-14
|
[array(['Moura', 'Filipe', ''], dtype=object)]
|
6,837 |
1109.3129
|
Joachim Krieger
|
Ioan Bejenaru, Joachim Krieger, Daniel Tataru
|
A codimension two stable manifold of near soliton equivariant wave maps
| null | null | null | null |
math.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider finite energy equivariant solutions for the wave map problem from
R2+1 to S2 which are close to the soliton family. We prove asymptotic orbital
stability for a codimension two class of initial data which is small with
respect to a stronger topology than the energy.
|
[{'version': 'v1', 'created': 'Wed, 14 Sep 2011 16:30:07 GMT'}]
|
2011-09-15
|
[array(['Bejenaru', 'Ioan', ''], dtype=object)
array(['Krieger', 'Joachim', ''], dtype=object)
array(['Tataru', 'Daniel', ''], dtype=object)]
|
6,838 |
1404.4152
|
Yongchao Liu
|
Yongchao Liu, Bertil Schmidt
|
SWAPHI: Smith-Waterman Protein Database Search on Xeon Phi Coprocessors
|
A short version of this paper has been accepted by the IEEE ASAP 2014
conference
| null |
10.1109/ASAP.2014.6868657
| null |
cs.DC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The maximal sensitivity of the Smith-Waterman (SW) algorithm has enabled its
wide use in biological sequence database search. Unfortunately, the high
sensitivity comes at the expense of quadratic time complexity, which makes the
algorithm computationally demanding for big databases. In this paper, we
present SWAPHI, the first parallelized algorithm employing Xeon Phi
coprocessors to accelerate SW protein database search. SWAPHI is designed based
on the scale-and-vectorize approach, i.e. it boosts alignment speed by
effectively utilizing both the coarse-grained parallelism from the many
co-processing cores (scale) and the fine-grained parallelism from the 512-bit
wide single instruction, multiple data (SIMD) vectors within each core
(vectorize). By searching against the large UniProtKB/TrEMBL protein database,
SWAPHI achieves a performance of up to 58.8 billion cell updates per second
(GCUPS) on one coprocessor and up to 228.4 GCUPS on four coprocessors.
Furthermore, it demonstrates good parallel scalability on varying number of
coprocessors, and is also superior to both SWIPE on 16 high-end CPU cores and
BLAST+ on 8 cores when using four coprocessors, with the maximum speedup of
1.52 and 1.86, respectively. SWAPHI is written in C++ language (with a set of
SIMD intrinsics), and is freely available at http://swaphi.sourceforge.net.
|
[{'version': 'v1', 'created': 'Wed, 16 Apr 2014 07:02:36 GMT'}
{'version': 'v2', 'created': 'Thu, 17 Apr 2014 06:51:36 GMT'}]
|
2016-11-17
|
[array(['Liu', 'Yongchao', ''], dtype=object)
array(['Schmidt', 'Bertil', ''], dtype=object)]
|
6,839 |
hep-th/0002103
|
Matthias Klein
|
Mathias Klein, Raul Rabadan
|
Orientifolds with discrete torsion
|
Latex, 48 pages, v2: several misprints and sign errors corrected,
clarifications and references added
|
JHEP 0007 (2000) 040
|
10.1088/1126-6708/2000/07/040
|
FTUAM-00/06, IFT-UAM/CSIC-00-08
|
hep-th
| null |
We show how discrete torsion can be implemented in D=4, N=1 type IIB
orientifolds. Some consistency conditions are found from the closed string and
open string spectrum and from tadpole cancellation. Only real values of the
discrete torsion parameter are allowed, i.e. epsilon=+-1. Orientifold models
are related to real projective representations. In a similar way as complex
projective representations are classified by H^2(Gamma,C^*)=H^2(Gamma,U(1)),
real projective representations are characterized by
H^2(Gamma,R^*)=H^2(Gamma,Z_2). Four different types of orientifold
constructions are possible. We classify these models and give the spectrum and
the tadpole cancellation conditions explicitly.
|
[{'version': 'v1', 'created': 'Mon, 14 Feb 2000 19:04:54 GMT'}
{'version': 'v2', 'created': 'Thu, 25 May 2000 16:50:25 GMT'}]
|
2009-10-31
|
[array(['Klein', 'Mathias', ''], dtype=object)
array(['Rabadan', 'Raul', ''], dtype=object)]
|
6,840 |
2107.12890
|
Daniel Kowal
|
Daniel R. Kowal
|
Subset selection for linear mixed models
| null | null | null | null |
stat.ME stat.CO stat.ML
|
http://creativecommons.org/licenses/by/4.0/
|
Linear mixed models (LMMs) are instrumental for regression analysis with
structured dependence, such as grouped, clustered, or multilevel data. However,
selection among the covariates--while accounting for this structured
dependence--remains a challenge. We introduce a Bayesian decision analysis for
subset selection with LMMs. Using a Mahalanobis loss function that incorporates
the structured dependence, we derive optimal linear coefficients for (i) any
given subset of variables and (ii) all subsets of variables that satisfy a
cardinality constraint. Crucially, these estimates inherit shrinkage or
regularization and uncertainty quantification from the underlying Bayesian
model, and apply for any well-specified Bayesian LMM. More broadly, our
decision analysis strategy deemphasizes the role of a single "best" subset,
which is often unstable and limited in its information content, and instead
favors a collection of near-optimal subsets. This collection is summarized by
key member subsets and variable-specific importance metrics. Customized subset
search and out-of-sample approximation algorithms are provided for more
scalable computing. These tools are applied to simulated data and a
longitudinal physical activity dataset, and demonstrate excellent prediction,
estimation, and selection ability.
|
[{'version': 'v1', 'created': 'Tue, 27 Jul 2021 15:47:44 GMT'}
{'version': 'v2', 'created': 'Mon, 18 Apr 2022 18:19:23 GMT'}]
|
2022-04-20
|
[array(['Kowal', 'Daniel R.', ''], dtype=object)]
|
6,841 |
2202.12513
|
Teppei Suzuki
|
Teppei Suzuki
|
TeachAugment: Data Augmentation Optimization Using Teacher Knowledge
|
To appear in CVPR2022 (Oral presentation) Code:
https://github.com/DensoITLab/TeachAugment
| null | null | null |
cs.CV
|
http://creativecommons.org/licenses/by/4.0/
|
Optimization of image transformation functions for the purpose of data
augmentation has been intensively studied. In particular, adversarial data
augmentation strategies, which search augmentation maximizing task loss, show
significant improvement in the model generalization for many tasks. However,
the existing methods require careful parameter tuning to avoid excessively
strong deformations that take away image features critical for acquiring
generalization. In this paper, we propose a data augmentation optimization
method based on the adversarial strategy called TeachAugment, which can produce
informative transformed images to the model without requiring careful tuning by
leveraging a teacher model. Specifically, the augmentation is searched so that
augmented images are adversarial for the target model and recognizable for the
teacher model. We also propose data augmentation using neural networks, which
simplifies the search space design and allows for updating of the data
augmentation using the gradient method. We show that TeachAugment outperforms
existing methods in experiments of image classification, semantic segmentation,
and unsupervised representation learning tasks.
|
[{'version': 'v1', 'created': 'Fri, 25 Feb 2022 06:22:51 GMT'}
{'version': 'v2', 'created': 'Mon, 7 Mar 2022 00:48:45 GMT'}
{'version': 'v3', 'created': 'Mon, 28 Mar 2022 23:19:38 GMT'}]
|
2022-03-30
|
[array(['Suzuki', 'Teppei', ''], dtype=object)]
|
6,842 |
1011.5903
|
Asan Damanik
|
Asan Damanik
|
Neutrino Masses via a Seesaw with Heavy Majorana and Dirac Neutrino Mass
Matrices from Discrete Subgroup $\Delta (27)$ of SU(3)
|
7 pages, no figure, Talk given at the 16th International Seminar on
High Energy Physics "QUARKS 2010", 6-12 June 2010, Kolomna, Russia
|
Proceed. 16th Int. Sem. " QUARKS' 2010": 2(2010) 126-131
| null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Neutrino mass matrix via a seesaw mechanism is constructed by assuming that
the underlying symmetry of both heavy Majorana and Dirac mass matrices is the
discrete subgroup $\Delta(27)$ symmetry of SU(3). Using the experimental data
of neutrino oscillation, the neutrino mass matrix exhibits maximal
$\nu_{\mu}-\nu_{\tau}$ mixing and has a specific prediction on the effective
neutrino mass in neutrinoless double beta decay which can be tested in future
experiment.
|
[{'version': 'v1', 'created': 'Thu, 25 Nov 2010 23:16:53 GMT'}]
|
2011-06-08
|
[array(['Damanik', 'Asan', ''], dtype=object)]
|
6,843 |
1211.7093
|
Ricardo Farias
|
Lizardo H. C. M. Nunes, R. L. S. Farias and E. C. Marino
|
The competition between the superconducting and the excitonic phases on
doped Dirac electronic systems
|
3 pages, Proceedings contribution for Hadrons XII
|
AIP Conference Proceedings 1520, 255 (2013)
|
10.1063/1.4795966
| null |
cond-mat.str-el cond-mat.mes-hall cond-mat.supr-con hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the competition between the superconducting and the excitonic
phases on Dirac electrons on a bipartite planar lattice. The conditions for the
appearance of superconductivity or excitonic condensate are given by the minima
of the free energy and our results are explained.
|
[{'version': 'v1', 'created': 'Thu, 29 Nov 2012 21:17:50 GMT'}]
|
2020-09-29
|
[array(['Nunes', 'Lizardo H. C. M.', ''], dtype=object)
array(['Farias', 'R. L. S.', ''], dtype=object)
array(['Marino', 'E. C.', ''], dtype=object)]
|
6,844 |
0705.1335
|
Kasso Okoudjou
|
Ilya A. Krishtal, Kasso A. Okoudjou
|
Invertibility of the Gabor frame operator on the Wiener amalgam space
| null | null | null | null |
math.FA math.CA
| null |
We use a generalization of Wiener's $1/f$ theorem to prove that for a Gabor
frame with the generator in the Wiener amalgam space $W(L^{\infty},
\ell^{1}_{\nu})(\mathbb{R}^{d})$, the corresponding frame operator is
invertible on this space. Therefore, for such a Gabor frame, the generator of
the canonical dual belongs also to $W(L^{\infty},
\ell^{1}_{\nu})(\mathbb{R}^{d}) $
|
[{'version': 'v1', 'created': 'Wed, 9 May 2007 17:43:54 GMT'}]
|
2007-05-23
|
[array(['Krishtal', 'Ilya A.', ''], dtype=object)
array(['Okoudjou', 'Kasso A.', ''], dtype=object)]
|
6,845 |
2203.13577
|
Jacob Odg{\aa}rd T{\o}rring
|
Jacob O. T{\o}rring, Anne C. Elster
|
Analyzing Search Techniques for Autotuning Image-based GPU Kernels: The
Impact of Sample Sizes
|
10 pages, 5 figures
| null | null | null |
cs.DC
|
http://creativecommons.org/licenses/by-sa/4.0/
|
Modern computing systems are increasingly more complex, with their multicore
CPUs and GPUs accelerators changing yearly, if not more often. It thus has
become very challenging to write programs that efficiently use the associated
complex memory systems and take advantage of the available parallelism.
Autotuning addresses this by optimizing parameterized code to the targeted
hardware by searching for the optimal set of parameters. Empirical autotuning
has therefore gained interest during the past decades. While new autotuning
algorithms are regularly presented and published, we will show why comparing
these autotuning algorithms is a deceptively difficult task.
In this paper, we describe our empirical study of state-of-the-art search
techniques for autotuning by comparing them on a range of sample sizes,
benchmarks and architectures. We optimize 6 tunable parameters with a
search-space size of over 2 million. The algorithms studied include Random
Search (RS), Random Forest Regression (RF), Genetic Algorithms (GA), Bayesian
Optimization with Gaussian Processes (BO GP) and Bayesian Optimization with
Tree-Parzen Estimators (BO TPE).
Our results on the ImageCL benchmark suite suggest that the ideal autotuning
algorithm heavily depends on the sample size. In our study, BO GP and BO TPE
outperform the other algorithms in most scenarios with sample sizes from 25 to
100. However, GA usually outperforms the others for sample sizes 200 and
beyond. We generally see the most speedup to be gained over RS in the lower
range of sample sizes (25-100). However, the algorithms more consistently
outperform RS for higher sample sizes (200-400). Hence, no single
state-of-the-art algorithm outperforms the rest for all sample sizes. Some
suggestions for future work are also included.
|
[{'version': 'v1', 'created': 'Fri, 25 Mar 2022 11:11:41 GMT'}]
|
2022-03-28
|
[array(['Tørring', 'Jacob O.', ''], dtype=object)
array(['Elster', 'Anne C.', ''], dtype=object)]
|
6,846 |
2008.07908
|
Narayan Bhusal
|
Mukesh Gautam, Narayan Bhusal, Mohammed Benidris, and Sushil J. Louis
|
A Spanning Tree-based Genetic Algorithm for Distribution Network
Reconfiguration
|
This paper has been accepted by IAS 2020 for presentation
| null | null | null |
eess.SY cs.SY
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper presents a spanning tree-based genetic algorithm (GA) for the
reconfiguration of electrical distribution systems with the objective of
minimizing active power losses. Due to low voltage levels at distribution
systems, power losses are high and sensitive to system configuration.
Therefore, optimal reconfiguration is an important factor in the operation of
distribution systems to minimize active power losses. Smart and automated
electric distribution systems are able to reconfigure as a response to changes
in load levels to minimize active power losses. The proposed method searches
spanning trees of potential configurations and finds the optimal spanning tree
using a genetic algorithm in two steps. In the first step, all invalid
combinations of branches and tie-lines (i.e., switching combinations that do
not provide power to some of loads or violate the radiality and connectivity
conditions) generated by initial population of GA are filtered out with the
help of spanning-tree search algorithm. In the second step, power flow analyses
are performed only for combinations that form spanning trees. The optimal
configuration is then determined based on the amount of active power losses
(optimal configuration is the one that results in minimum power losses). The
proposed method is implemented on several systems including the well-known
33-node and 69-node systems. The results show that the proposed method is
accurate and efficient in comparison with existing methods.
|
[{'version': 'v1', 'created': 'Tue, 18 Aug 2020 13:07:42 GMT'}]
|
2020-08-19
|
[array(['Gautam', 'Mukesh', ''], dtype=object)
array(['Bhusal', 'Narayan', ''], dtype=object)
array(['Benidris', 'Mohammed', ''], dtype=object)
array(['Louis', 'Sushil J.', ''], dtype=object)]
|
6,847 |
2011.09513
|
Sai Mani Prudhvi Valleti
|
Mani Valleti, Reinis Ignatans, Sergei V. Kalinin, Vasiliki Tileli
|
Decoding the mechanisms of phase transitions from in situ microscopy
observations
|
15 pages and 6 figures
| null | null | null |
cond-mat.mtrl-sci cond-mat.mes-hall
|
http://creativecommons.org/licenses/by/4.0/
|
Temperature-induced phase transition in BaTiO3 has been explored using the
machine learning analysis of domain morphologies visualized via
variable-temperature scanning transmission electron microscopy (STEM) imaging
data. This approach is based on the multivariate statistical analysis of the
time or temperature dependence of the statistical descriptors of the system,
derived in turn from the categorical classification of observed domain
structures or projection on the continuous parameter space of the feature
extraction-dimensionality reduction transform. The proposed workflow offers a
powerful tool for the exploration of the dynamic data based on the statistics
of image representation as a function of the external control variable to
visualize the transformation pathways during phase transitions and chemical
reactions. This can include the mesoscopic STEM data as demonstrated here, but
also optical, chemical imaging, etc. data. It can further be extended to the
higher dimensional spaces, for example, analysis of the combinatorial libraries
of materials compositions.
|
[{'version': 'v1', 'created': 'Wed, 18 Nov 2020 19:37:39 GMT'}]
|
2020-11-20
|
[array(['Valleti', 'Mani', ''], dtype=object)
array(['Ignatans', 'Reinis', ''], dtype=object)
array(['Kalinin', 'Sergei V.', ''], dtype=object)
array(['Tileli', 'Vasiliki', ''], dtype=object)]
|
6,848 |
2208.02669
|
Robin Sch\"urmann
|
X. Chen, T. Gehrmann, E.W.N. Glover, M. H\"ofer, A. Huss, R.
Sch\"urmann
|
NNLO Photon Production with Realistic Photon Isolation
|
11 pages, 2 figures, one table, contribution to the proceedings of
"Loops and Legs in Quantum Field Theory - LL2022, 25-30 April, 2022, Ettal,
Germany"
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Isolated photon production at hadron colliders proceeds via direct production
and fragmentation processes. Theory predictions for the isolated photon and
photon-plus-jet cross section often impose idealised photon isolation criteria,
eliminating the fragmentation contribution and introducing a systematic
uncertainty in the comparison to data. We present NNLO predictions for the
photon-plus-jet cross section with the experimental isolation including both,
direct and fragmentation contributions. Predictions with two different
parton-to-photon fragmentation functions are compared, allowing for an
estimation of the uncertainty stemming from the only loosely constrained photon
fragmentation functions.
|
[{'version': 'v1', 'created': 'Thu, 4 Aug 2022 13:57:02 GMT'}]
|
2022-08-05
|
[array(['Chen', 'X.', ''], dtype=object)
array(['Gehrmann', 'T.', ''], dtype=object)
array(['Glover', 'E. W. N.', ''], dtype=object)
array(['Höfer', 'M.', ''], dtype=object)
array(['Huss', 'A.', ''], dtype=object)
array(['Schürmann', 'R.', ''], dtype=object)]
|
6,849 |
1201.4928
|
Lyderic Bocquet
|
C. Cottin-Bizonne, C. Barentin, L. Bocquet
|
Scaling laws for slippage on superhydrophobic fractal surfaces
| null |
Physics of Fluids, vol. 24, 012001 (2012)
|
10.1063/1.3674300
| null |
cond-mat.soft physics.flu-dyn
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the slippage on hierarchical fractal superhydrophobic surfaces, and
find an unexpected rich behavior for hydrodynamic friction on these surfaces.
We develop a scaling law approach for the effective slip length, which is
validated by numerical resolution of the hydrodynamic equations. Our results
demonstrate that slippage does strongly depend on the fractal dimension, and is
found to be always smaller on fractal surfaces as compared to surfaces with
regular patterns. This shows that in contrast to naive expectations, the value
of effective contact angle is not sufficient to infer the amount of slippage on
a fractal surface: depending on the underlying geometry of the roughness,
strongly superhydrophobic surfaces may in some cases be fully inefficient in
terms of drag reduction. Finally, our scaling analysis can be directly extended
to the study of heat transfer at fractal surfaces, in order to estimate the
Kapitsa surface resistance on patterned surfaces, as well as to the question of
trapping of diffusing particles by patchy hierarchical surfaces, in the context
of chemoreception.
|
[{'version': 'v1', 'created': 'Tue, 24 Jan 2012 08:47:04 GMT'}]
|
2015-06-03
|
[array(['Cottin-Bizonne', 'C.', ''], dtype=object)
array(['Barentin', 'C.', ''], dtype=object)
array(['Bocquet', 'L.', ''], dtype=object)]
|
6,850 |
1611.03339
|
Francesco Fidaleo
|
Vitonofrio Crismale, Francesco Fidaleo and Yun Gang Lu
|
Limits of some weighted Cesaro averages
|
11 pages, Results in Mathematics "online first", we inserted a "note
added in proof"
| null |
10.1007/s00025-016-0622-z
| null |
math.FA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the existence of the limit of some high order weighted Cesaro
averages.
|
[{'version': 'v1', 'created': 'Wed, 9 Nov 2016 19:46:07 GMT'}
{'version': 'v2', 'created': 'Mon, 5 Dec 2016 14:11:44 GMT'}]
|
2016-12-06
|
[array(['Crismale', 'Vitonofrio', ''], dtype=object)
array(['Fidaleo', 'Francesco', ''], dtype=object)
array(['Lu', 'Yun Gang', ''], dtype=object)]
|
6,851 |
1307.4374
|
Young Jhon I
|
Young I. Jhon and Myung S. Jhon
|
Electron Transport Properties of Graphene-Graphyne-Graphene Transistors:
First Principles Study
|
14 pages, 10 figures
| null | null | null |
cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A novel nanoelectronic device is constructed by graphyne that is robustly
connected between graphene electrodes, where graphyne is composed of hexagonal
carbon rings and carbon chains. Owing to similarities between the bond lengths
and unit cell shapes of graphene and graphyne, they have perfectly matched
interfacial structure at periodic locations, enabling the facilitated charge
transfer and heterostructural stability. Using a combined nonequilibrium
Green's function and density functional theory formalism, we have
systematically investigated the electron transport properties of
graphene-graphyne-graphene field effect transistors (FETs) by varying the
graphyne size and the carbon chain length. These devices exhibit excellent
switching behaviors with ON/OFF ratios on the order of 10^2-10^3. The ON/OFF
ratio increases as either of the graphyne size or the carbon chain length
increases. Noticeably, these devices sustain good FET features even at the
small graphyne size of 8.5 A, yielding ON/OFF ratio of 650 and transmission
energy gap of 0.8 eV, which suggests their potential applications for
fabricating highly-integrated circuits at the level comparable to molecular
devices. Their boron-nitrides analogues show similar qualitative behaviors for
the changes of the graphyne size and bias voltage, but they show higher ON/OFF
ratios for the smaller chain length in contrast to graphyne TFTs.
|
[{'version': 'v1', 'created': 'Tue, 16 Jul 2013 18:50:31 GMT'}]
|
2013-07-17
|
[array(['Jhon', 'Young I.', ''], dtype=object)
array(['Jhon', 'Myung S.', ''], dtype=object)]
|
6,852 |
0705.3887
|
Massimiliano Grazzini
|
G. Bozzi, S. Catani, D. de Florian, M. Grazzini
|
Higgs boson production at the LHC: transverse-momentum resummation and
rapidity dependence
|
References added
|
Nucl.Phys.B791:1-19,2008
|
10.1016/j.nuclphysb.2007.09.034
| null |
hep-ph
| null |
We consider Higgs boson production by gluon fusion in hadron collisions. We
study the doubly-differential transverse-momentum (q_T) and rapidity (y)
distribution of the Higgs boson in perturbative QCD. In the region of small q_T
(q_T << M_H, M_H being the mass of the Higgs boson), we include the effect of
logarithmically-enhanced contributions due to multiparton radiation to all
perturbative orders. We use the impact parameter and double Mellin moments to
implement and factorize the multiparton kinematics constraint of transverse-
and longitudinal-momentum conservation. The logarithmic terms are then
systematically resummed in exponential form. At small q_T, we perform the
all-order resummation of large logarithms up to next-to-next-to-leading
logarithmic accuracy, while at large q_T (q_T ~ M_H), we apply a matching
procedure that recovers the fixed-order perturbation theory up to
next-to-leading order. We present quantitative results for the differential
cross section in q_T and y at the LHC, and we comment on the comparison with
the q_T cross section integrated over y.
|
[{'version': 'v1', 'created': 'Sat, 26 May 2007 09:49:07 GMT'}
{'version': 'v2', 'created': 'Mon, 11 Feb 2008 11:56:13 GMT'}]
|
2008-11-26
|
[array(['Bozzi', 'G.', ''], dtype=object)
array(['Catani', 'S.', ''], dtype=object)
array(['de Florian', 'D.', ''], dtype=object)
array(['Grazzini', 'M.', ''], dtype=object)]
|
6,853 |
2209.03892
|
Benjamin Niswonger
|
Benjamin Niswonger
|
What You See is What You Get: Local Labor Markets and Skill Acquisition
| null | null | null | null |
econ.GN q-fin.EC
|
http://creativecommons.org/licenses/by-sa/4.0/
|
This paper highlights the potential for negative dynamic consequences of
recent trends towards the formation of "skill-hubs". I first show evidence that
skill acquisition is biased towards skills which are in demand in local labor
markets. This fact along with large heterogeneity in outcomes by major and
recent reductions in migration rates implies a significant potential for
inefficient skill upgrading over time. To evaluate the impact of local bias in
education in the context of standard models which focus on agglomeration
effects, I develop a structural spatial model which includes educational
investment. The model focuses on two sources of externalities: productivity
through agglomeration and signaling. Both of these affect educational decisions
tilting the balance of aggregate skill composition. Signaling externalities can
provide a substantial wedge in the response to changes in skill demand and
skill concentration with the potential for substantial welfare gains from a
more equal distribution of skills.
|
[{'version': 'v1', 'created': 'Thu, 8 Sep 2022 15:55:16 GMT'}]
|
2022-09-09
|
[array(['Niswonger', 'Benjamin', ''], dtype=object)]
|
6,854 |
1510.07453
|
Vivek Mohan Mallick
|
Umesh V. Dubey and Vivek Mohan Mallick
|
On Differential Graded Eilenberg Moore Construction
|
19 pages
| null | null | null |
math.AG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper studies the Eilenberg Moore construction on DG categories. As
applications one proves results on factoring of monads as composition of a pair
of adjoint exact functors and further applications to reinterpretations of
equivariant traingulated categories.
|
[{'version': 'v1', 'created': 'Mon, 26 Oct 2015 12:18:02 GMT'}
{'version': 'v2', 'created': 'Tue, 7 Aug 2018 08:38:06 GMT'}]
|
2018-08-08
|
[array(['Dubey', 'Umesh V.', ''], dtype=object)
array(['Mallick', 'Vivek Mohan', ''], dtype=object)]
|
6,855 |
2112.14799
|
Michael O'Neill
|
Frank E. Curtis, Michael J. O'Neill, Daniel P. Robinson
|
Worst-Case Complexity of an SQP Method for Nonlinear Equality
Constrained Stochastic Optimization
|
46 pages, 0 figures
| null | null |
Lehigh ISE Technical Report 22T-001
|
math.OC
|
http://creativecommons.org/licenses/by/4.0/
|
A worst-case complexity bound is proved for a sequential quadratic
optimization (commonly known as SQP) algorithm that has been designed for
solving optimization problems involving a stochastic objective function and
deterministic nonlinear equality constraints. Barring additional terms that
arise due to the adaptivity of the monotonically nonincreasing merit parameter
sequence, the proved complexity bound is comparable to that known for the
stochastic gradient algorithm for unconstrained nonconvex optimization. The
overall complexity bound, which accounts for the adaptivity of the merit
parameter sequence, shows that a result comparable to the unconstrained setting
(with additional logarithmic factors) holds with high probability.
|
[{'version': 'v1', 'created': 'Wed, 29 Dec 2021 19:32:09 GMT'}
{'version': 'v2', 'created': 'Thu, 6 Jan 2022 23:52:01 GMT'}]
|
2022-01-10
|
[array(['Curtis', 'Frank E.', ''], dtype=object)
array(["O'Neill", 'Michael J.', ''], dtype=object)
array(['Robinson', 'Daniel P.', ''], dtype=object)]
|
6,856 |
1811.03906
|
Helge Spieker
|
Arnaud Gotlieb, Dusica Marijan, Helge Spieker
|
ITE: A Lightweight Implementation of Stratified Reasoning for
Constructive Logical Operators
|
Extended journal version
|
International Journal on Artificial Intelligence Tools, Vol. 29,
No. 03n04, 2060006 (2020)
|
10.1142/S0218213020600064
| null |
cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Constraint Programming (CP) is a powerful declarative programming paradigm
where inference and search are interleaved to find feasible and optimal
solutions to various type of constraint systems. However, handling logical
connectors with constructive information in CP is notoriously difficult. This
paper presents If Then Else (ITE), a lightweight implementation of stratified
constructive reasoning for logical connectives. Stratification is introduced to
cope with the risk of combinatorial explosion of constructing information from
nested and combined logical operators. ITE is an open-source library built on
top of SICStus Prolog clp(fd), which proposes various operators, including
constructive disjunction and negation, constructive implication and
conditional. These operators can be used to express global constraints and to
benefit from constructive reasoning for more domain pruning during constraint
filtering. Even though ITE is not competitive with specialized filtering
algorithms available in some global constraints implementations, its
expressiveness allows users to easily define well-tuned constraints with
powerful deduction capabilities. Our extended experimental results show that
ITE is more efficient than available generic approaches that handle logical
constraint systems over finite domains.
|
[{'version': 'v1', 'created': 'Fri, 9 Nov 2018 14:07:47 GMT'}
{'version': 'v2', 'created': 'Thu, 19 Dec 2019 14:26:14 GMT'}
{'version': 'v3', 'created': 'Mon, 22 Jun 2020 06:23:43 GMT'}]
|
2020-06-23
|
[array(['Gotlieb', 'Arnaud', ''], dtype=object)
array(['Marijan', 'Dusica', ''], dtype=object)
array(['Spieker', 'Helge', ''], dtype=object)]
|
6,857 |
2212.00436
|
Octave Mariotti
|
Octave Mariotti, Oisin Mac Aodha and Hakan Bilen
|
ViewNeRF: Unsupervised Viewpoint Estimation Using Category-Level Neural
Radiance Fields
| null |
Proceedings of the 33rd British Machine Vision Conference, BMVC
2022
| null | null |
cs.CV
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
We introduce ViewNeRF, a Neural Radiance Field-based viewpoint estimation
method that learns to predict category-level viewpoints directly from images
during training. While NeRF is usually trained with ground-truth camera poses,
multiple extensions have been proposed to reduce the need for this expensive
supervision. Nonetheless, most of these methods still struggle in complex
settings with large camera movements, and are restricted to single scenes, i.e.
they cannot be trained on a collection of scenes depicting the same object
category. To address these issues, our method uses an analysis by synthesis
approach, combining a conditional NeRF with a viewpoint predictor and a scene
encoder in order to produce self-supervised reconstructions for whole object
categories. Rather than focusing on high fidelity reconstruction, we target
efficient and accurate viewpoint prediction in complex scenarios, e.g.
360{\deg} rotation on real data. Our model shows competitive results on
synthetic and real datasets, both for single scenes and multi-instance
collections.
|
[{'version': 'v1', 'created': 'Thu, 1 Dec 2022 11:16:11 GMT'}]
|
2022-12-02
|
[array(['Mariotti', 'Octave', ''], dtype=object)
array(['Mac Aodha', 'Oisin', ''], dtype=object)
array(['Bilen', 'Hakan', ''], dtype=object)]
|
6,858 |
0709.1730
|
Sami Amasha
|
S. Amasha, K. MacLean, Iuliana P. Radu, D. M. Zumbuhl, M. A. Kastner,
M. P. Hanson, A. C. Gossard
|
Spin-Dependent Tunneling of Single Electrons into an Empty Quantum Dot
|
4 pages, 3 figures
|
Phys. Rev. B 78, 041306(R) (2008)
|
10.1103/PhysRevB.78.041306
| null |
cond-mat.mes-hall
| null |
Using real-time charge sensing and gate pulsing techniques we measure the
ratio of the rates for tunneling into the excited and ground spin states of a
single-electron AlGaAs/GaAs quantum dot in a parallel magnetic field. We find
that the ratio decreases with increasing magnetic field until tunneling into
the excited spin state is completely suppressed. However, we find that by
adjusting the voltages on the surface gates to change the orbital configuration
of the dot we can restore tunneling into the excited spin state and that the
ratio reaches a maximum when the dot is symmetric.
|
[{'version': 'v1', 'created': 'Tue, 11 Sep 2007 22:28:42 GMT'}]
|
2012-04-06
|
[array(['Amasha', 'S.', ''], dtype=object)
array(['MacLean', 'K.', ''], dtype=object)
array(['Radu', 'Iuliana P.', ''], dtype=object)
array(['Zumbuhl', 'D. M.', ''], dtype=object)
array(['Kastner', 'M. A.', ''], dtype=object)
array(['Hanson', 'M. P.', ''], dtype=object)
array(['Gossard', 'A. C.', ''], dtype=object)]
|
6,859 |
1806.03148
|
Gregory MacDougall
|
B. Wolin, X. Wang, T. Naibert, S. L. Gleason, G. J. MacDougall, H. D.
Zhou, S. L. Cooper, and R. Budakian
|
Real-Space Magnetic Imaging of the Multiferroic Spinels MnV2O4 and Mn3O4
|
23 pages, 8 figures, To be published in Physical Review Materials
|
Phys. Rev. Materials 2, 064407 (2018)
|
10.1103/PhysRevMaterials.2.064407
| null |
cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Controlling multiferroic behavior in materials will enable the development of
a wide variety of technological applications. However, the exact mechanisms
driving multiferroic behavior are not well understood in most materials. Two
such materials are the spinels MnV2O4 and Mn3O4, where mechanical strain is
thought to play a role in determining magnetic behavior. Bulk studies of MnV2O4
have yielded conflicting and inconclusive results, due in part to the presence
of mesoscale magnetic inhomogeneity, which complicates the interpretation of
bulk measurements. To study the sub-micron-scale magnetic properties of
Mn-based spinel materials, we performed magnetic force microscopy (MFM) on
MnV2O4 samples subject to different levels of mechanical strain. We also used a
crystal grain mapping technique to perform spatially registered MFM on Mn3O4.
These local investigations revealed 100-nm-scale "stripe" modulations in the
magnetic structure of both materials. In MnV2O4, the magnetization of these
stripes is estimated to be Mz $\approx$ 105 A/m, which is on the order of the
saturation magnetization reported previously. Cooling in a strong magnetic
field eliminated the stripe patterning only in the low-strain sample of MnV2O4.
The discovery of nanoscale magnetostructural inhomogeneity that is highly
susceptible to magnetic field control in these materials necessitates both a
revision of theoretical proposals and a reinterpretation of experimental data
regarding the low-temperature phases and magnetic-field-tunable properties of
these Mn-based spinels.
|
[{'version': 'v1', 'created': 'Fri, 8 Jun 2018 13:42:03 GMT'}]
|
2018-06-27
|
[array(['Wolin', 'B.', ''], dtype=object)
array(['Wang', 'X.', ''], dtype=object)
array(['Naibert', 'T.', ''], dtype=object)
array(['Gleason', 'S. L.', ''], dtype=object)
array(['MacDougall', 'G. J.', ''], dtype=object)
array(['Zhou', 'H. D.', ''], dtype=object)
array(['Cooper', 'S. L.', ''], dtype=object)
array(['Budakian', 'R.', ''], dtype=object)]
|
6,860 |
2108.01896
|
Lillian Yau
|
Ekkehard Glimm, Lillian Yau
|
Geometric approaches to assessing the numerical feasibility for
conducting matching-adjusted indirect comparisons
|
7 figures, 23 pages
|
Pharmaceutical Statistics 2022
|
10.1002/pst.2210
| null |
stat.AP
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
We discuss how to handle matching-adjusted indirect comparison (MAIC) from a
data analyst's perspective. We introduce several multivariate data analysis
methods to assess the appropriateness of MAIC for a given data set. These
methods focus on comparing the baseline variables used in the matching from a
study that provides the summary statistics, or aggregated data (AD) and a study
that provides individual patient level data (IPD). The methods identify
situations when no numerical solutions are possible with the MAIC method. This
helps to avoid misleading results being produced. Moreover, it has been
observed that sometimes contradicting results are reported by two sets of MAIC
analyses produced by two teams, each having their own IPD and applying MAIC
using the AD published by the other team. We show that an intrinsic property of
the MAIC estimated weights can be a contributing factor for this phenomenon.
|
[{'version': 'v1', 'created': 'Wed, 4 Aug 2021 08:12:34 GMT'}]
|
2022-03-18
|
[array(['Glimm', 'Ekkehard', ''], dtype=object)
array(['Yau', 'Lillian', ''], dtype=object)]
|
6,861 |
hep-th/9203049
|
Hiroki Fukutaka
|
Hiroki Fukutaka
|
Path-Integral Measure of Linearized Gravity in Curved Spacetime
|
25 pages
| null | null | null |
hep-th
| null |
The path-integral measure of linearized gravity around a saddle-point
background with the cosmological term is considered in order to study the
conformal rotation prescription proposed by Gibbons, Hawking and Perry. It is
also argued that the most generally used measure, i.e., the covariant
path-integral measure, does not give us a one-loop partition function which the
only physical variables contribute and that its path integral fails to keep the
cancellation of contributions between the Faddeev-Popov ghosts and the
unphysical variables of the linearized gravitational field, although it has a
coordinate invariant measure. In de~Sitter spacetime, it is shown that the
uncancellation factor can be understood as a nontrivial (anomalous) Jacobian
factor under the transformation of the path-integral measure from covariant one
to canonical one.
|
[{'version': 'v1', 'created': 'Wed, 18 Mar 1992 14:15:34 GMT'}
{'version': 'v2', 'created': 'Thu, 19 Mar 1992 02:49:41 GMT'}]
|
2008-02-03
|
[array(['Fukutaka', 'Hiroki', ''], dtype=object)]
|
6,862 |
1609.02375
|
Julius Mboli Sechang
|
Julius Sechang Mboli
|
Feasibility Study on Disaster Management with Hybrid Network of LTE and
Satellite Links
|
This is a summary of my MSc Dissertation. It has 8 pages
| null | null | null |
cs.NI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We are highly vulnerable to either natural or artificial catastrophes and
therefore, Public Protection and Disaster Relief (PPDR) operators need reliable
wireless communications for successful operations especially in critical rescue
missions. PPDR dedicated or commercial terrestrial networks have always been
used which at most times lead to unsuccessful operations. This is due to the
fact these networks are all infrastructure-based which can be destroyed, fail
to deliver the required service or the networks are not able to support and
sustain the sudden traffic surge. Long-Term Evolution (LTE) is earmarked as the
future candidate technology for PPDR purpose and so much have been put into it
in terms of research, perhaps suitable architecture that will meet
mission-critical requirements can be developed. This can only work if
terrestrial networks will always be available. Unfortunately, in worst case
scenarios, infrastructures might get damaged totally or might be destroyed by
subsequent disasters. As a result, adequate guarantees can only be possible in
the hypothesis of very high financial involvement. Fortunately, considering
availability, coverage ubiquity and reliability, satellite technologies have
lately proven good. So, to maximize the high channel performance of terrestrial
networks and the availability and reliability of non-terrestrial networks, the
solution lies in a hybrid system. It is on this ground that this work deals
with the integration of LTE and satellite networks in both infrastructure-based
and infrastructure-less topologies for PPDR purpose. It is aim at providing
people trapped in disaster and field operators with a transparent accessibility
and guaranteed coverage even when infrastructures are damaged. The requirements
are defined and the model simulated. The network is able to provide network
coverage, enhanced capacity and promised greater resilience.
|
[{'version': 'v1', 'created': 'Thu, 8 Sep 2016 11:21:27 GMT'}]
|
2016-09-09
|
[array(['Mboli', 'Julius Sechang', ''], dtype=object)]
|
6,863 |
1512.01015
|
Altug Ozpineci
|
A. Kucukarslan, U. Ozdem, A. Ozpineci
|
Axial vector transition form factors of $N \rightarrow \Delta$ in QCD
|
12 pages, 4 figures, 2 tables, improved analysis, conclusions
unmodified
|
Nucl.Phys. B913 (2016) 132-150
|
10.1016/j.nuclphysb.2016.09.019
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The isovector axial vector form factors of $N \rightarrow \Delta$ transition
are calculated by employing Light-cone QCD sum rules. The analytical results
are analysed by both the conventional method, and also by a Monte Carlo based
approach which allows one to scan all of the parameter space. The predictions
are also compared with the results in the literature, where available. Although
the Monte Carlo analysis predicts large uncertainties in the predicted results,
the predictions obtained by the conventional analysis are in good agreement
with other results in the literature.
|
[{'version': 'v1', 'created': 'Thu, 3 Dec 2015 09:53:03 GMT'}
{'version': 'v2', 'created': 'Tue, 18 Oct 2016 06:11:06 GMT'}]
|
2016-10-19
|
[array(['Kucukarslan', 'A.', ''], dtype=object)
array(['Ozdem', 'U.', ''], dtype=object)
array(['Ozpineci', 'A.', ''], dtype=object)]
|
6,864 |
1602.05471
|
Jacopo Mancin
|
Francesca Biagini and Jacopo Mancin
|
Robust Financial Bubbles
| null | null | null | null |
q-fin.MF
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the concept of financial bubble in a market model endowed with a set
of probability measures, typically mutually singular to each other. In this
setting we introduce the notions of robust bubble and robust fundamental value
in a consistent way with the existing literature in the case a unique prior
exists. The notion of no dominance is also investigated under the uncertainty
framework. Finally, we provide concrete examples illustrating our results.
|
[{'version': 'v1', 'created': 'Wed, 17 Feb 2016 16:24:12 GMT'}]
|
2016-02-18
|
[array(['Biagini', 'Francesca', ''], dtype=object)
array(['Mancin', 'Jacopo', ''], dtype=object)]
|
6,865 |
1404.5018
|
Ravit Helled
|
Ravit Helled and Peter Bodenheimer
|
The Formation of Uranus & Neptune: Challenges and Implications For
Intermediate-Mass Exoplanets
|
Accepted for publication in ApJ
| null |
10.1088/0004-637X/789/1/69
| null |
astro-ph.EP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we investigate the formation of Uranus and Neptune, according
to the core-nucleated accretion model, considering formation locations ranging
from 12 to 30 AU from the Sun, and with various disk solid-surface densities
and core accretion rates. It is shown that in order to form Uranus-like and
Neptune-like planets in terms of final mass and solid-to-gas ratio, very
specific conditions are required. We also show that when recently proposed high
solid accretion rates are assumed, along with solid surface densities about 10
times those in the minimum-mass solar nebula, the challenge in forming Uranus
and Neptune at large radial distances is no longer the formation timescale, but
is rather finding agreement with the final mass and composition of these
planets. In fact, these conditions are more likely to lead to gas-giant
planets. Scattering of planetesimals by the forming planetary core is found to
be an important effect at the larger distances. Our study emphasizes how (even
slightly) different conditions in the protoplanetary disk and the birth
environment of the planetary embryos can lead to the formation of very
different planets in terms of final masses and compositions (solid-to-gas
ratios), which naturally explains the large diversity of intermediate-mass
exoplanets.
|
[{'version': 'v1', 'created': 'Sun, 20 Apr 2014 05:58:29 GMT'}]
|
2015-06-19
|
[array(['Helled', 'Ravit', ''], dtype=object)
array(['Bodenheimer', 'Peter', ''], dtype=object)]
|
6,866 |
1807.05620
|
Dongdong She
|
Dongdong She, Kexin Pei, Dave Epstein, Junfeng Yang, Baishakhi Ray,
Suman Jana
|
NEUZZ: Efficient Fuzzing with Neural Program Smoothing
|
To appear in the 40th IEEE Symposium on Security and Privacy, May
20--22, 2019, San Francisco, CA, USA
| null | null | null |
cs.CR cs.LG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Fuzzing has become the de facto standard technique for finding software
vulnerabilities. However, even state-of-the-art fuzzers are not very efficient
at finding hard-to-trigger software bugs. Most popular fuzzers use evolutionary
guidance to generate inputs that can trigger different bugs. Such evolutionary
algorithms, while fast and simple to implement, often get stuck in fruitless
sequences of random mutations. Gradient-guided optimization presents a
promising alternative to evolutionary guidance. Gradient-guided techniques have
been shown to significantly outperform evolutionary algorithms at solving
high-dimensional structured optimization problems in domains like machine
learning by efficiently utilizing gradients or higher-order derivatives of the
underlying function. However, gradient-guided approaches are not directly
applicable to fuzzing as real-world program behaviors contain many
discontinuities, plateaus, and ridges where the gradient-based methods often
get stuck. We observe that this problem can be addressed by creating a smooth
surrogate function approximating the discrete branching behavior of target
program. In this paper, we propose a novel program smoothing technique using
surrogate neural network models that can incrementally learn smooth
approximations of a complex, real-world program's branching behaviors. We
further demonstrate that such neural network models can be used together with
gradient-guided input generation schemes to significantly improve the fuzzing
efficiency. Our extensive evaluations demonstrate that NEUZZ significantly
outperforms 10 state-of-the-art graybox fuzzers on 10 real-world programs both
at finding new bugs and achieving higher edge coverage. NEUZZ found 31 unknown
bugs that other fuzzers failed to find in 10 real world programs and achieved
3X more edge coverage than all of the tested graybox fuzzers for 24 hours
running.
|
[{'version': 'v1', 'created': 'Sun, 15 Jul 2018 21:54:31 GMT'}
{'version': 'v2', 'created': 'Sun, 4 Nov 2018 23:17:38 GMT'}
{'version': 'v3', 'created': 'Fri, 28 Dec 2018 03:51:13 GMT'}
{'version': 'v4', 'created': 'Fri, 12 Jul 2019 18:47:26 GMT'}]
|
2019-07-16
|
[array(['She', 'Dongdong', ''], dtype=object)
array(['Pei', 'Kexin', ''], dtype=object)
array(['Epstein', 'Dave', ''], dtype=object)
array(['Yang', 'Junfeng', ''], dtype=object)
array(['Ray', 'Baishakhi', ''], dtype=object)
array(['Jana', 'Suman', ''], dtype=object)]
|
6,867 |
hep-ph/0212179
|
Burkhard Kaempfer
|
B. Kampfer, A. Peshier, G. Soff
|
Quasi-particle model for deconfined matter
|
Contribution to 5th Intern. Conf. "Quark Confinement and the Hadron
Spectrum", Gargnano (It), Sep. 10 - 14, 2002
| null |
10.1142/9789812704269_0087
| null |
hep-ph
| null |
Our quasi-particle model for deconfined matter near T_c is reviewed. The
extrapolation of lattice QCD data to a finite baryo-chemical potential is
discussed. Determined by the chiral transition temperature T_c, the resulting
equation of state of neutral and beta-stable deconfined matter is soft and
limits size and mass of pure quark stars.
|
[{'version': 'v1', 'created': 'Thu, 12 Dec 2002 19:37:31 GMT'}]
|
2017-08-23
|
[array(['Kampfer', 'B.', ''], dtype=object)
array(['Peshier', 'A.', ''], dtype=object)
array(['Soff', 'G.', ''], dtype=object)]
|
6,868 |
0709.0617
|
Ladislav \v{S}amaj
|
L. Samaj
|
Widom-Rowlinson model (continuum and lattice)
|
5 pages, to appear in "Selecta" within the project "Modern
Encyclopedia of Mathematical Physics" (Springer)
| null | null | null |
cond-mat.stat-mech
| null |
This is a short review about liquid-vapor and crystalline phase transitions
in continuum and lattice Widom-Rowlinson models.
|
[{'version': 'v1', 'created': 'Wed, 5 Sep 2007 11:02:03 GMT'}]
|
2007-09-06
|
[array(['Samaj', 'L.', ''], dtype=object)]
|
6,869 |
2206.13965
|
Alan Smeaton
|
Alan F. Smeaton, Aparajita Dey-Plissonneau, Hyowon Lee, Mingming Liu,
Michael Scriney
|
Analysis of Individual Conversational Volatility in Tandem
Telecollaboration for Second Language Learning
|
21st European Conference on e-Learning, October 2022, Brighton, UK
| null |
10.34190/ecel.21.1.590
| null |
cs.CL
|
http://creativecommons.org/licenses/by/4.0/
|
Second language learning can be enabled by tandem collaboration where
students are grouped into video conference calls while learning the native
language of other student(s) on the calls. This places students in an online
environment where the more outgoing can actively contribute and engage in
dialogue while those more shy and unsure of their second language skills can
sit back and coast through the calls. We have built and deployed the L2L system
which records timings of conversational utterances from all participants in a
call. We generate visualisations including participation rates and timelines
for each student in each call and present these on a dashboard. We have
recently developed a measure called personal conversational volatility for how
dynamic has been each student's contribution to the dialogue in each call. We
present an analysis of conversational volatility measures for a sample of 19
individual English-speaking students from our University who are learning
Frenchm, in each of 86 tandem telecollaboration calls over one teaching
semester. Our analysis shows there is a need to look into the nature of the
interactions and see if the choices of discussion topics assigned to them were
too difficult for some students and that may have influenced their engagement
in some way.
|
[{'version': 'v1', 'created': 'Tue, 28 Jun 2022 12:34:00 GMT'}]
|
2022-10-25
|
[array(['Smeaton', 'Alan F.', ''], dtype=object)
array(['Dey-Plissonneau', 'Aparajita', ''], dtype=object)
array(['Lee', 'Hyowon', ''], dtype=object)
array(['Liu', 'Mingming', ''], dtype=object)
array(['Scriney', 'Michael', ''], dtype=object)]
|
6,870 |
1912.00492
|
Wei Kang
|
Wei Kang and Qi Gong and Tenavi Nakamura-Zimmerer
|
Algorithms of Data Development For Deep Learning and Feedback Design
|
15 pages, 1 figure
|
Physica D: Nonlinear Phenomena 425 (2021) 132955
|
10.1016/j.physd.2021.132955
| null |
math.DS math.OC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent research reveals that deep learning is an effective way of solving
high dimensional Hamilton-Jacobi-Bellman equations. The resulting feedback
control law in the form of a neural network is computationally efficient for
real-time applications of optimal control. A critical part of this design
method is to generate data for training the neural network and validating its
accuracy. In this paper, we provide a survey of existing algorithms that can be
used to generate data. All the algorithms surveyed in this paper are
causality-free, i.e., the solution at a point is computed without using the
value of the function at any other points. At the end of the paper, an
illustrative example of optimal feedback design using deep learning is given.
|
[{'version': 'v1', 'created': 'Sun, 1 Dec 2019 20:12:14 GMT'}
{'version': 'v2', 'created': 'Tue, 28 Jan 2020 22:25:08 GMT'}]
|
2022-10-10
|
[array(['Kang', 'Wei', ''], dtype=object)
array(['Gong', 'Qi', ''], dtype=object)
array(['Nakamura-Zimmerer', 'Tenavi', ''], dtype=object)]
|
6,871 |
1907.04831
|
Muhammad R. A. Khandaker PhD
|
Tian-Hao Li, Muhammad R. A. Khandaker, Faisal Tariq, Kai-Kit Wong and
Risala T. Khan
|
Learning the Wireless V2I Channels Using Deep Neural Networks
| null | null | null | null |
eess.SP cs.IT cs.LG math.IT stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
For high data rate wireless communication systems, developing an efficient
channel estimation approach is extremely vital for channel detection and signal
recovery. With the trend of high-mobility wireless communications between
vehicles and vehicles-to-infrastructure (V2I), V2I communications pose
additional challenges to obtaining real-time channel measurements. Deep
learning (DL) techniques, in this context, offer learning ability and
optimization capability that can approximate many kinds of functions. In this
paper, we develop a DL-based channel prediction method to estimate channel
responses for V2I communications. We have demonstrated how fast neural networks
can learn V2I channel properties and the changing trend. The network is trained
with a series of channel responses and known pilots, which then speculates the
next channel response based on the acquired knowledge. The predicted channel is
then used to evaluate the system performance.
|
[{'version': 'v1', 'created': 'Wed, 10 Jul 2019 17:24:45 GMT'}]
|
2019-07-11
|
[array(['Li', 'Tian-Hao', ''], dtype=object)
array(['Khandaker', 'Muhammad R. A.', ''], dtype=object)
array(['Tariq', 'Faisal', ''], dtype=object)
array(['Wong', 'Kai-Kit', ''], dtype=object)
array(['Khan', 'Risala T.', ''], dtype=object)]
|
6,872 |
2211.01736
|
Emre Can Acikgoz
|
Emre Can Acikgoz, Tilek Chubakov, M\"uge Kural, G\"ozde G\"ul
\c{S}ahin, Deniz Yuret
|
Transformers on Multilingual Clause-Level Morphology
| null | null | null | null |
cs.CL cs.AI cs.LG
|
http://creativecommons.org/licenses/by/4.0/
|
This paper describes our winning systems in MRL: The 1st Shared Task on
Multilingual Clause-level Morphology (EMNLP 2022 Workshop) designed by KUIS AI
NLP team. We present our work for all three parts of the shared task:
inflection, reinflection, and analysis. We mainly explore transformers with two
approaches: (i) training models from scratch in combination with data
augmentation, and (ii) transfer learning with prefix-tuning at multilingual
morphological tasks. Data augmentation significantly improves performance for
most languages in the inflection and reinflection tasks. On the other hand,
Prefix-tuning on a pre-trained mGPT model helps us to adapt analysis tasks in
low-data and multilingual settings. While transformer architectures with data
augmentation achieved the most promising results for inflection and
reinflection tasks, prefix-tuning on mGPT received the highest results for the
analysis task. Our systems received 1st place in all three tasks in MRL 2022.
|
[{'version': 'v1', 'created': 'Thu, 3 Nov 2022 11:53:39 GMT'}
{'version': 'v2', 'created': 'Sun, 13 Nov 2022 10:39:39 GMT'}]
|
2022-11-15
|
[array(['Acikgoz', 'Emre Can', ''], dtype=object)
array(['Chubakov', 'Tilek', ''], dtype=object)
array(['Kural', 'Müge', ''], dtype=object)
array(['Şahin', 'Gözde Gül', ''], dtype=object)
array(['Yuret', 'Deniz', ''], dtype=object)]
|
6,873 |
1802.03549
|
Florian Adriaens
|
Florian Adriaens, Tijl De Bie, Aristides Gionis, Jefrey Lijffijt,
Polina Rozenshtein
|
From acquaintance to best friend forever: robust and fine-grained
inference of social tie strengths
| null |
Data Min. Knowl. Discov. 34(3): 611-651 (2020)
|
10.1007/s10618-020-00673-0
| null |
cs.SI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Social networks often provide only a binary perspective on social ties: two
individuals are either connected or not. While sometimes external information
can be used to infer the strength of social ties, access to such information
may be restricted or impractical. Sintos and Tsaparas (KDD 2014) first
suggested to infer the strength of social ties from the topology of the network
alone, by leveraging the Strong Triadic Closure (STC) property. The STC
property states that if person A has strong social ties with persons B and C, B
and C must be connected to each other as well (whether with a weak or strong
tie). Sintos and Tsaparas exploited this to formulate the inference of the
strength of social ties as NP-hard optimization problem, and proposed two
approximation algorithms. We refine and improve upon this landmark paper, by
developing a sequence of linear relaxations of this problem that can be solved
exactly in polynomial time. Usefully, these relaxations infer more fine-grained
levels of tie strength (beyond strong and weak), which also allows to avoid
making arbitrary strong/weak strength assignments when the network topology
provides inconclusive evidence. One of the relaxations simultaneously infers
the presence of a limited number of STC violations. An extensive theoretical
analysis leads to two efficient algorithmic approaches. Finally, our
experimental results elucidate the strengths of the proposed approach, and
sheds new light on the validity of the STC property in practice.
|
[{'version': 'v1', 'created': 'Sat, 10 Feb 2018 08:52:54 GMT'}
{'version': 'v2', 'created': 'Thu, 7 Jun 2018 09:51:57 GMT'}
{'version': 'v3', 'created': 'Tue, 18 Sep 2018 13:47:59 GMT'}]
|
2021-11-08
|
[array(['Adriaens', 'Florian', ''], dtype=object)
array(['De Bie', 'Tijl', ''], dtype=object)
array(['Gionis', 'Aristides', ''], dtype=object)
array(['Lijffijt', 'Jefrey', ''], dtype=object)
array(['Rozenshtein', 'Polina', ''], dtype=object)]
|
6,874 |
2004.08486
|
TuanAnh Dao
|
Tuan Anh Dao, Ahmad Z. Fino
|
Critical exponent for semi-linear structurally damped wave equation of
derivative type
|
9 pages
| null |
10.1002/mma.6649
| null |
math.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Main purpose of this paper is to study the following semi-linear structurally
damped wave equation with nonlinearity of derivative type: $$u_{tt}- \Delta u+
\mu(-\Delta)^{\sigma/2} u_t= |u_t|^p,\quad u(0,x)= u_0(x),\quad
u_t(0,x)=u_1(x),$$ with $\mu>0$, $n\geq1$, $\sigma \in (0,2]$ and $p>1$. In
particular, we are going to prove the non-existence of global weak solutions by
using a new test function and suitable sign assumptions on the initial data in
both the subcritical case and the critical case.
|
[{'version': 'v1', 'created': 'Fri, 17 Apr 2020 23:24:00 GMT'}
{'version': 'v2', 'created': 'Wed, 22 Apr 2020 09:44:57 GMT'}]
|
2020-12-02
|
[array(['Dao', 'Tuan Anh', ''], dtype=object)
array(['Fino', 'Ahmad Z.', ''], dtype=object)]
|
6,875 |
1304.2807
|
Adam Paetznick
|
Adam Paetznick, Austin G. Fowler
|
Quantum circuit optimization by topological compaction in the surface
code
|
26 pages, 14 figures
| null | null | null |
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The fragile nature of quantum information limits our ability to construct
large quantities of quantum bits suitable for quantum computing. An important
goal, therefore, is to minimize the amount of resources required to implement
quantum algorithms, many of which are serial in nature and leave large numbers
of qubits idle much of the time unless compression techniques are used.
Furthermore, quantum error-correcting codes, which are required to reduce the
effects of noise, introduce additional resource overhead. We consider a
strategy for quantum circuit optimization based on topological deformation in
the surface code, one of the best performing and most practical quantum
error-correcting codes. Specifically, we examine the problem of minimizing
computation time on a two-dimensional qubit lattice of arbitrary, but fixed
dimension, and propose two algorithms for doing so.
|
[{'version': 'v1', 'created': 'Tue, 9 Apr 2013 22:30:55 GMT'}]
|
2013-04-11
|
[array(['Paetznick', 'Adam', ''], dtype=object)
array(['Fowler', 'Austin G.', ''], dtype=object)]
|
6,876 |
2210.07485
|
Sishuo Chen
|
Sishuo Chen, Xiaohan Bi, Rundong Gao, Xu Sun
|
Holistic Sentence Embeddings for Better Out-of-Distribution Detection
|
Findings of EMNLP 2022
| null | null | null |
cs.CL cs.AI
|
http://creativecommons.org/licenses/by/4.0/
|
Detecting out-of-distribution (OOD) instances is significant for the safe
deployment of NLP models. Among recent textual OOD detection works based on
pretrained language models (PLMs), distance-based methods have shown superior
performance. However, they estimate sample distance scores in the last-layer
CLS embedding space and thus do not make full use of linguistic information
underlying in PLMs. To address the issue, we propose to boost OOD detection by
deriving more holistic sentence embeddings. On the basis of the observations
that token averaging and layer combination contribute to improving OOD
detection, we propose a simple embedding approach named Avg-Avg, which averages
all token representations from each intermediate layer as the sentence
embedding and significantly surpasses the state-of-the-art on a comprehensive
suite of benchmarks by a 9.33% FAR95 margin. Furthermore, our analysis
demonstrates that it indeed helps preserve general linguistic knowledge in
fine-tuned PLMs and substantially benefits detecting background shifts. The
simple yet effective embedding method can be applied to fine-tuned PLMs with
negligible extra costs, providing a free gain in OOD detection. Our code is
available at https://github.com/lancopku/Avg-Avg.
|
[{'version': 'v1', 'created': 'Fri, 14 Oct 2022 03:22:58 GMT'}]
|
2022-10-17
|
[array(['Chen', 'Sishuo', ''], dtype=object)
array(['Bi', 'Xiaohan', ''], dtype=object)
array(['Gao', 'Rundong', ''], dtype=object)
array(['Sun', 'Xu', ''], dtype=object)]
|
6,877 |
1504.07456
|
Tejas Guruswamy
|
Tejas Guruswamy, David J. Goldie, Stafford Withington
|
Quasiparticle effective temperature in superconducting thin films
illuminated at THz frequencies
|
4 pages, 5 figures. Presented at the 26th International Symposium on
Space Terahertz Technology, Cambridge, MA, 16-18 March 2015
| null | null | null |
cond-mat.supr-con physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The response of superconducting pair-breaking detectors is dependent on the
details of the quasiparticle distribution. In Kinetic Inductance Detectors
(KIDs), where both pair breaking and non-pair breaking photons are absorbed
simultaneously, calculating the detector response therefore requires knowledge
of the often nonequilibrium distributions. The quasiparticle effective
temperature provides a good approximation to these nonequilibrium
distributions. We compare an analytical expression relating absorbed power and
the quasiparticle effective temperature in superconducting thin films to full
solutions for the nonequilibrium distributions, and find good agreement for a
range of materials, absorbed powers, photon frequencies and temperatures
typical of KIDs. This analytical expression allows inclusion of nonequilibrium
effects in device models without solving for the detailed distributions. We
also show our calculations of the frequency dependence of the detector response
are in agreement with recent experimental measurements of the response of Ta
KIDs at THz frequencies.
|
[{'version': 'v1', 'created': 'Tue, 28 Apr 2015 12:59:12 GMT'}]
|
2015-04-29
|
[array(['Guruswamy', 'Tejas', ''], dtype=object)
array(['Goldie', 'David J.', ''], dtype=object)
array(['Withington', 'Stafford', ''], dtype=object)]
|
6,878 |
1303.6807
|
Richard Clegg
|
R. G. Clegg and R. Landa and D. Griffin and E. Mykoniati and M. Rio
|
The performance of locality-aware topologies for peer-to-peer live
streaming
|
This is an expanded version of a paper presented at the 2008 UK
Performance Engineering Workshop
|
Clegg, R.G.; Landa, R.; Griffin, D.; Mykoniati, E.; Rio, M.:
'Performance of locality-aware topologies for peer-to-peer live streaming',
IET Software, 2009, 3, (6), p. 470-479
|
10.1049/iet-sen.2009.0005
| null |
cs.NI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper is concerned with the effect of overlay network topology on the
performance of live streaming peer-to-peer systems. The paper focuses on the
evaluation of topologies which are aware of the delays experienced between
different peers on the network. Metrics are defined which assess the topologies
in terms of delay, bandwidth usage and resilience to peer drop-out. Several
topology creation algorithms are tested and the metrics are measured in a
simple simulation testbed. This gives an assessment of the type of gains which
might be expected from locality awareness in peer-to-peer networks.
|
[{'version': 'v1', 'created': 'Wed, 27 Mar 2013 12:39:22 GMT'}]
|
2013-03-28
|
[array(['Clegg', 'R. G.', ''], dtype=object)
array(['Landa', 'R.', ''], dtype=object)
array(['Griffin', 'D.', ''], dtype=object)
array(['Mykoniati', 'E.', ''], dtype=object)
array(['Rio', 'M.', ''], dtype=object)]
|
6,879 |
2011.06830
|
Jiyue Huang
|
Jiyue Huang, Rania Talbi, Zilong Zhao, Sara Boucchenak, Lydia Y. Chen,
Stefanie Roos
|
An Exploratory Analysis on Users' Contributions in Federated Learning
| null | null | null | null |
cs.DC
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
Federated Learning is an emerging distributed collaborative learning paradigm
adopted by many of today's applications, e.g., keyboard prediction and object
recognition. Its core principle is to learn from large amount of users data
while preserving data privacy by design as collaborative users only need to
share the machine learning models and keep data locally. The main challenge for
such systems is to provide incentives to users to contribute high-quality
models trained from their local data. In this paper, we aim to answer how well
incentives recognize (in)accurate local models from honest and malicious users,
and perceive their impacts on the model accuracy of federated learning systems.
We first present a thorough survey on two contrasting perspectives: incentive
mechanisms to measure the contribution of local models by honest users, and
malicious users to deliberately degrade the overall model. We conduct
simulation experiments to empirically demonstrate if existing contribution
measurement schemes can disclose low-quality models from malicious users. Our
results show there exists a clear tradeoff among measurement schemes in terms
of the computational efficiency and effectiveness to distill the impact of
malicious participants. We conclude this paper by discussing the research
directions to design resilient contribution incentives.
|
[{'version': 'v1', 'created': 'Fri, 13 Nov 2020 09:40:54 GMT'}]
|
2020-11-16
|
[array(['Huang', 'Jiyue', ''], dtype=object)
array(['Talbi', 'Rania', ''], dtype=object)
array(['Zhao', 'Zilong', ''], dtype=object)
array(['Boucchenak', 'Sara', ''], dtype=object)
array(['Chen', 'Lydia Y.', ''], dtype=object)
array(['Roos', 'Stefanie', ''], dtype=object)]
|
6,880 |
1302.0761
|
Manuel Silva
|
M. D. V. Silva and R. Napiwotzki
|
High Galactic latitude runaway stars as tracers of the spiral arms
|
9 pages, 12 figures. Accepted for publication in MNRAS
| null |
10.1093/mnras/stt177
| null |
astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A direct observation of the spiral structure of the Galaxy is hindered by our
position in the middle of the Galactic plane. We propose a method based on the
analysis of the birthplaces of high Galactic latitude runaway stars to map the
spiral arms and determine their dynamics. As a proof of concept, the method is
applied to a local sample of early-type stars and a sample of runaways stars to
obtain estimates of the pattern speed and the spiral arm's phase angle. We also
estimate the performance of this method once the data gathered by Gaia, in
particular for runaway stars observed on the other side of the Galaxy, is
available.
|
[{'version': 'v1', 'created': 'Mon, 4 Feb 2013 17:23:26 GMT'}]
|
2015-06-12
|
[array(['Silva', 'M. D. V.', ''], dtype=object)
array(['Napiwotzki', 'R.', ''], dtype=object)]
|
6,881 |
0905.4579
|
Patricia Sanchez-Blazquez
|
Patricia Sanchez-Blazquez, Stephanie Courty, Brad Gibson, Christopher
Brook
|
The Origin of the Light Distribution in Spiral Galaxies
|
Accepted for publication in MNRAS
| null |
10.1111/j.1365-2966.2009.15133.x
| null |
astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyse a high-resolution, fully cosmological, hydrodynamical disc galaxy
simulation, to study the source of the double-exponential light profiles seen
in many stellar discs, and the effects of stellar radial migration upon the
spatio-temporal evolution of both the disc age and metallicity distributions.
We find a "break" in the pure exponential stellar surface brightness profile,
and trace its origin to a sharp decrease in the star formation per unit surface
area, itself produced by a decrease in the gas volume density due to a warping
of the gas disc. Star formation in the disc continues well beyond the break. We
find that the break is more pronounced in bluer wavebands. By contrast, we find
little or no break in the mass density profile. This is, in part, due to the
net radial migration of stars towards the external parts of the disc. Beyond
the break radius, we find that ~60% of the resident stars migrated from the
inner disc, while ~25% formed in situ. Our simulated galaxy also has a minimum
in the age profile at the break radius but, in disagreement with some previous
studies, migration is not the main mechanism producing this shape. In our
simulation, the disc metallicity gradient flattens with time, consistent with
an "inside-out" formation scenario. We do not find any difference in the
intensity or the position of the break with inclination, suggesting that
perhaps the differences found in empirical studies are driven by dust
extinction.
|
[{'version': 'v1', 'created': 'Thu, 28 May 2009 09:13:22 GMT'}]
|
2015-05-13
|
[array(['Sanchez-Blazquez', 'Patricia', ''], dtype=object)
array(['Courty', 'Stephanie', ''], dtype=object)
array(['Gibson', 'Brad', ''], dtype=object)
array(['Brook', 'Christopher', ''], dtype=object)]
|
6,882 |
2008.00809
|
Sumanth Chennupati
|
Sumanth Chennupati, Sai Nooka, Shagan Sah, Raymond W Ptucha
|
Adaptive Hierarchical Decomposition of Large Deep Networks
| null | null | null | null |
cs.LG cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Deep learning has recently demonstrated its ability to rival the human brain
for visual object recognition. As datasets get larger, a natural question to
ask is if existing deep learning architectures can be extended to handle the
50+K classes thought to be perceptible by a typical human. Most deep learning
architectures concentrate on splitting diverse categories, while ignoring the
similarities amongst them. This paper introduces a framework that automatically
analyzes and configures a family of smaller deep networks as a replacement to a
singular, larger network. Class similarities guide the creation of a family
from course to fine classifiers which solve categorical problems more
effectively than a single large classifier. The resulting smaller networks are
highly scalable, parallel and more practical to train, and achieve higher
classification accuracy. This paper also proposes a method to adaptively select
the configuration of the hierarchical family of classifiers using linkage
statistics from overall and sub-classification confusion matrices. Depending on
the number of classes and the complexity of the problem, a deep learning model
is selected and the complexity is determined. Numerous experiments on network
classes, layers, and architecture configurations validate our results.
|
[{'version': 'v1', 'created': 'Fri, 17 Jul 2020 21:04:50 GMT'}]
|
2020-08-04
|
[array(['Chennupati', 'Sumanth', ''], dtype=object)
array(['Nooka', 'Sai', ''], dtype=object)
array(['Sah', 'Shagan', ''], dtype=object)
array(['Ptucha', 'Raymond W', ''], dtype=object)]
|
6,883 |
2111.08877
|
Weiping Yan
|
Weiping Yan, Weijia Li
|
Global stability dynamics of the timelike extremal hypersurfaces in
Minkowski space
|
33 pages, correct some typos
| null | null | null |
math.AP
|
http://creativecommons.org/publicdomain/zero/1.0/
|
This paper aims to study the relationship between the timelike extremal
hypersurfaces and the classical minimal surfaces. This target also gives the
long time dynamics of timelike extremal hypersurfaces in Minkowski spacetime
$\mathbb{R}^{1+M}$ with the dimension $2\leq M\leq7$. In this dimension, the
stationary solution of timelike extremal hypersurface equation is the solution
of classical minimal surface equation, which only admits the hyperplane
solution by Bernstein theorem. We prove that this hyperplane solution as the
stationary solution of timelike extremal hypersurface equation is asymptotic
stablely by finding the hidden dissipative structure of linearized equation.
Here we overcome that the vector field method (based on the energy estimate and
bootstrap argument) is lose effectiveness due to the lack of time-decay of
solution for the linear perturbation equation. Meanwhile, a global well-posed
result of linear damped wave with variable time-space coefficients is
established. Hence, our result construct a unique global timelike non-small
solution near the hyperplane.
|
[{'version': 'v1', 'created': 'Wed, 17 Nov 2021 03:02:40 GMT'}
{'version': 'v2', 'created': 'Mon, 6 Dec 2021 13:38:13 GMT'}
{'version': 'v3', 'created': 'Tue, 25 Jan 2022 10:05:58 GMT'}]
|
2022-01-26
|
[array(['Yan', 'Weiping', ''], dtype=object)
array(['Li', 'Weijia', ''], dtype=object)]
|
6,884 |
1803.05836
|
Raluca Balan
|
Raluca M. Balan and Dina Jankovic
|
Asymptotic theory for longitudinal data with missing responses adjusted
by inverse probability weights
|
29 pages
| null | null | null |
math.ST stat.TH
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this article, we propose a new method for analyzing longitudinal data
which contain responses that are missing at random. This method consists in
solving the generalized estimating equation (GEE) of Liang and Zeger (1986) in
which the incomplete responses are replaced by values adjusted using the
inverse probability weights proposed in Yi, Ma and Carroll (2012). We show that
the root estimator is consistent and asymptotically normal, essentially under
the some conditions on the marginal distribution and the surrogate correlation
matrix as those presented in Xie and Yang (2003) in the case of complete data,
and under minimal assumptions on the missingness probabilities. This method is
applied to a real-life dataset taken from Sommer, Katz and Tarwotjo (1984),
which examines the incidence of respiratory disease in a sample of 250
pre-school age Indonesian children which were examined every 3 months for 18
months, using as covariates the age, gender, and vitamin A deficiency.
|
[{'version': 'v1', 'created': 'Thu, 15 Mar 2018 16:15:04 GMT'}]
|
2018-03-16
|
[array(['Balan', 'Raluca M.', ''], dtype=object)
array(['Jankovic', 'Dina', ''], dtype=object)]
|
6,885 |
hep-th/0111041
|
Liu Zhao
|
Wenli He, Liu Zhao
|
The origin of noncommutativity?
|
Revtex4, published version
|
Phys.Lett. B532 (2002) 345-349
|
10.1016/S0370-2693(02)01567-8
| null |
hep-th
| null |
Consistent boundary Poisson structures for open string theory coupled to
background $B$-field are considered using the new approach proposed in
hep-th/0111005. It is found that there are infinitely many consistent Poisson
structures, each leads to a consistent canonical quantization of open string in
the presence of background $B$-field. Consequently, whether the $D$-branes to
which the open string end points are attached is noncommutative or not depends
on the choice of a particular Poisson structure.
|
[{'version': 'v1', 'created': 'Tue, 6 Nov 2001 01:56:36 GMT'}
{'version': 'v2', 'created': 'Wed, 7 Nov 2001 02:26:01 GMT'}
{'version': 'v3', 'created': 'Thu, 5 Sep 2002 02:26:25 GMT'}]
|
2009-11-07
|
[array(['He', 'Wenli', ''], dtype=object)
array(['Zhao', 'Liu', ''], dtype=object)]
|
6,886 |
1706.06339
|
Philipp Grete
|
Philipp Grete, Brian W. O'Shea, Kris Beckwith, Wolfram Schmidt, Andrew
Christlieb
|
Energy transfer in compressible magnetohydrodynamic turbulence
|
16 pages, 8 figures
|
Physics of Plasmas 24, 092311 (2017)
|
10.1063/1.4990613
| null |
physics.plasm-ph astro-ph.CO astro-ph.GA astro-ph.SR physics.flu-dyn
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Magnetic fields, compressibility and turbulence are important factors in many
terrestrial and astrophysical processes. While energy dynamics, i.e. how energy
is transferred within and between kinetic and magnetic reservoirs, has been
previously studied in the context of incompressible magnetohydrodynamic (MHD)
turbulence, we extend shell-to-shell energy transfer analysis to the
compressible regime. We derive four new transfer functions specifically
capturing compressibility effects in the kinetic and magnetic cascade, and
capturing energy exchange via magnetic pressure. To illustrate their viability,
we perform and analyze four simulations of driven isothermal MHD turbulence in
the sub- and supersonic regime with two different codes. On the one hand, our
analysis reveals robust characteristics across regime and numerical method. For
example, energy transfer between individual scales is local and forward for
both cascades with the magnetic cascade being stronger than the kinetic one.
Magnetic tension and magnetic pressure related transfers are less local and
weaker than the cascades. We find no evidence for significant nonlocal
transfer. On the other hand, we show that certain functions, e.g., the
compressive component of the magnetic energy cascade, exhibit a more complex
behavior that varies both with regime and numerical method. Having established
a basis for the analysis in the compressible regime, the method can now be
applied to study a broader parameter space.
|
[{'version': 'v1', 'created': 'Tue, 20 Jun 2017 09:31:24 GMT'}
{'version': 'v2', 'created': 'Tue, 3 Oct 2017 15:39:27 GMT'}]
|
2017-10-04
|
[array(['Grete', 'Philipp', ''], dtype=object)
array(["O'Shea", 'Brian W.', ''], dtype=object)
array(['Beckwith', 'Kris', ''], dtype=object)
array(['Schmidt', 'Wolfram', ''], dtype=object)
array(['Christlieb', 'Andrew', ''], dtype=object)]
|
6,887 |
hep-lat/0701011
|
Axel Maas
|
Attilio Cucchieri, Axel Maas, Tereza Mendes
|
Infrared-suppressed gluon propagator in 4d Yang-Mills theory in a
Landau-like gauge
|
5 pages, 2 figures, one figure with additional results and extended
discussion of some aspects of the results added and some minor
clarifications. In v3: Various small changes and additions
|
Mod.Phys.Lett.A22:2429-2438,2007
|
10.1142/S0217732307024450
| null |
hep-lat hep-ph
| null |
The infrared behavior of the gluon propagator is directly related to
confinement in QCD. Indeed, the Gribov-Zwanziger scenario of confinement
predicts an infrared vanishing (transverse) gluon propagator in Landau-like
gauges, implying violation of reflection positivity and gluon confinement.
Finite-volume effects make it very difficult to observe (in the minimal Landau
gauge) an infrared suppressed gluon propagator in lattice simulations of the
four-dimensional case. Here we report results for the SU(2) gluon propagator in
a gauge that interpolates between the minimal Landau gauge (for gauge parameter
lambda equal to 1) and the minimal Coulomb gauge (corresponding to lambda = 0).
For small values of lambda we find that the spatially-transverse gluon
propagator D^tr(0,|\vec p|), considered as a function of the spatial momenta
|\vec p|, is clearly infrared suppressed. This result is in agreement with the
Gribov-Zwanziger scenario and with previous numerical results in the minimal
Coulomb gauge. We also discuss the nature of the limit lambda -> 0 (complete
Coulomb gauge) and its relation to the standard Coulomb gauge (lambda = 0). Our
findings are corroborated by similar results in the three-dimensional case,
where the infrared suppression is observed for all considered values of lambda.
|
[{'version': 'v1', 'created': 'Mon, 15 Jan 2007 12:33:44 GMT'}
{'version': 'v2', 'created': 'Thu, 8 Mar 2007 17:53:17 GMT'}
{'version': 'v3', 'created': 'Fri, 10 Aug 2007 09:21:12 GMT'}]
|
2008-11-26
|
[array(['Cucchieri', 'Attilio', ''], dtype=object)
array(['Maas', 'Axel', ''], dtype=object)
array(['Mendes', 'Tereza', ''], dtype=object)]
|
6,888 |
math/0308033
|
Michael Larsen
|
Michael J. Larsen
|
Determining a semisimple group from its representation degrees
|
A missing and vital 3 word phrase ("with fiber functor") was added to
the introduction
| null | null | null |
math.RT
| null |
The Lie algbera of a compact semisimple Lie group G is determined by the
degrees of the irreducible representations of G. However, two different groups
can have the same representation degrees.
|
[{'version': 'v1', 'created': 'Tue, 5 Aug 2003 11:08:04 GMT'}
{'version': 'v2', 'created': 'Wed, 3 Sep 2003 18:08:15 GMT'}]
|
2007-05-23
|
[array(['Larsen', 'Michael J.', ''], dtype=object)]
|
6,889 |
2009.08826
|
Frederic Butin
|
Fr\'ed\'eric Butin
|
Generalized distance to a simplex and a new geometrical method for
portfolio optimization
|
18 pages, 5 figures
| null | null | null |
q-fin.PM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Risk aversion plays a significant and central role in investors' decisions in
the process of developing a portfolio. In this framework of portfolio
optimization we determine the portfolio that possesses the minimal risk by
using a new geometrical method. For this purpose, we elaborate an algorithm
that enables us to compute any generalized Euclidean distance to a standard
simplex. With this new approach, we are able to treat the case of portfolio
optimization without short-selling in its entirety, and we also recover in
geometrical terms the well-known results on portfolio optimization with allowed
short-selling. Then, we apply our results in order to determine which convex
combination of the CAC 40 stocks possesses the lowest risk: not only we get a
very low risk compared to the index, but we also get a return rate that is
almost three times better than the one of the index.
|
[{'version': 'v1', 'created': 'Fri, 18 Sep 2020 13:13:58 GMT'}]
|
2020-09-21
|
[array(['Butin', 'Frédéric', ''], dtype=object)]
|
6,890 |
gr-qc/0701171
|
Zhoujian Cao Dr
|
Shan Bai, Zhoujian Cao, Xuefei Gong, Yu Shang, Xiaoning Wu and Y.K.Lau
|
Light Cone Structure near Null Infinity of the Kerr Metric
| null |
Phys.Rev.D75:044003,2007
|
10.1103/PhysRevD.75.044003
| null |
gr-qc
| null |
Motivated by our attempt to understand the question of angular momentum of a
relativistic rotating source carried away by gravitational waves, in the
asymptotic regime near future null infinity of the Kerr metric, a family of
null hypersurfaces intersecting null infinity in shearfree (good) cuts are
constructed by means of asymptotic expansion of the eikonal equation. The
geometry of the null hypersurfaces as well asthe asymptotic structure of the
Kerr metric near null infinity are studied. To the lowest order in angular
momentum, the Bondi-Sachs form of the Kerr metric is worked out. The
Newman-Unti formalism is then further developed, with which the Newman-Penrose
constants of the Kerr metric are computed and shown to be zero. Possible
physical implications of the vanishing of the Newman-Penrose constants of the
Kerr metric are also briefly discussed.
|
[{'version': 'v1', 'created': 'Wed, 31 Jan 2007 08:07:18 GMT'}]
|
2008-11-26
|
[array(['Bai', 'Shan', ''], dtype=object)
array(['Cao', 'Zhoujian', ''], dtype=object)
array(['Gong', 'Xuefei', ''], dtype=object)
array(['Shang', 'Yu', ''], dtype=object)
array(['Wu', 'Xiaoning', ''], dtype=object)
array(['Lau', 'Y. K.', ''], dtype=object)]
|
6,891 |
2209.04023
|
Corey Adams
|
Corey Adams, Kazuhiro Terao, Marco Del Tutto, Taritree Wongjirad
|
An Efficient, Scalable IO Framework for Sparse Data: larcv3
| null | null | null | null |
hep-ex physics.comp-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Neutrino physics is one of the fundamental areas of research into the origins
and properties of the Universe. Many experimental neutrino projects use
sophisticated detectors to observe properties of these particles, and have
turned to deep learning and artificial intelligence techniques to analyze their
data. From this, we have developed \texttt{larcv}, a \texttt{C++} and
\texttt{Python} based framework for efficient IO of sparse data with particle
physics applications in mind. We describe in this paper the \texttt{larcv}
framework and some benchmark IO performance tests. \texttt{larcv} is designed
to enable fast and efficient IO of ragged and irregular data, at scale on
modern HPC systems, and is compatible with the most popular open source data
analysis tools in the Python ecosystem.
|
[{'version': 'v1', 'created': 'Thu, 8 Sep 2022 20:24:04 GMT'}]
|
2022-09-12
|
[array(['Adams', 'Corey', ''], dtype=object)
array(['Terao', 'Kazuhiro', ''], dtype=object)
array(['Del Tutto', 'Marco', ''], dtype=object)
array(['Wongjirad', 'Taritree', ''], dtype=object)]
|
6,892 |
1805.05256
|
Arzhang Ardavan
|
Junjie Liu, Jakub Mrozek, William K. Myers, Grigore A. Timco, Richard
E.P. Winpenny, Benjamin Kintzel, Winfried Plass, Arzhang Ardavan
|
Electric field control of spins in molecular magnets
|
6 pages, 3 figures
|
Phys. Rev. Lett. 122, 037202 (2019)
|
10.1103/PhysRevLett.122.037202
| null |
cond-mat.str-el
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Coherent control of individual molecular spins in nano-devices is a pivotal
prerequisite for fulfilling the potential promised by molecular spintronics. By
applying electric field pulses during time-resolved electron spin resonance
measurements, we measure the sensitivity of the spin in several
antiferromagnetic molecular nanomagnets to external electric fields. We find a
linear electric field dependence of the spin states in Cr$_7$Mn, an
antiferromagnetic ring with a ground-state spin of $S=1$, and in a frustrated
Cu$_3$ triangle, both with coefficients of about $2~\mathrm{rad}\,
\mathrm{s}^{-1} / \mathrm{V} \mathrm{m}^{-1}$. Conversely, the
antiferromagnetic ring Cr$_7$Ni, isomorphic with Cr$_7$Mn but with $S=1/2$,
does not exhibit a detectable effect. We propose that the spin-electric field
coupling may be used for selectively controlling individual molecules embedded
in nanodevices.
|
[{'version': 'v1', 'created': 'Mon, 14 May 2018 16:08:35 GMT'}
{'version': 'v2', 'created': 'Thu, 27 Dec 2018 12:59:57 GMT'}]
|
2019-01-30
|
[array(['Liu', 'Junjie', ''], dtype=object)
array(['Mrozek', 'Jakub', ''], dtype=object)
array(['Myers', 'William K.', ''], dtype=object)
array(['Timco', 'Grigore A.', ''], dtype=object)
array(['Winpenny', 'Richard E. P.', ''], dtype=object)
array(['Kintzel', 'Benjamin', ''], dtype=object)
array(['Plass', 'Winfried', ''], dtype=object)
array(['Ardavan', 'Arzhang', ''], dtype=object)]
|
6,893 |
2209.13424
|
Lorenzo Portinale
|
Mattia Magnabosco, Lorenzo Portinale, Tommaso Rossi
|
The Brunn--Minkowski inequality implies the CD condition in weighted
Riemannian manifolds
| null | null | null | null |
math.DG math.MG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The curvature dimension condition CD(K,N), pioneered by Sturm and
Lott--Villani, is a synthetic notion of having curvature bounded below and
dimension bounded above, in the non-smooth setting. This condition implies a
suitable generalization of the Brunn--Minkowski inequality, denoted by BM(K,N).
In this paper, we address the converse implication in the setting of weighted
Riemannian manifolds, proving that BM(K,N) is in fact equivalent to CD(K,N).
Our result allows to characterize the curvature dimension condition without
using neither the optimal transport nor the differential structure of the
manifold.
|
[{'version': 'v1', 'created': 'Tue, 27 Sep 2022 14:26:29 GMT'}]
|
2022-09-28
|
[array(['Magnabosco', 'Mattia', ''], dtype=object)
array(['Portinale', 'Lorenzo', ''], dtype=object)
array(['Rossi', 'Tommaso', ''], dtype=object)]
|
6,894 |
1802.08066
|
Rakshit Agrawal
|
Luca de Alfaro, Massimo Di Pierro, Rakshit Agrawal, Eugenio Tacchini,
Gabriele Ballarin, Marco L. Della Vedova, Stefano Moret
|
Reputation Systems for News on Twitter: A Large-Scale Study
| null | null | null | null |
cs.SI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Social networks offer a ready channel for fake and misleading news to spread
and exert influence. This paper examines the performance of different
reputation algorithms when applied to a large and statistically significant
portion of the news that are spread via Twitter. Our main result is that simple
algorithms based on the identity of the users spreading the news, as well as
the words appearing in the titles and descriptions of the linked articles, are
able to identify a large portion of fake or misleading news, while incurring
only very low (<1%) false positive rates for mainstream websites. We believe
that these algorithms can be used as the basis of practical, large-scale
systems for indicating to consumers which news sites deserve careful scrutiny
and skepticism.
|
[{'version': 'v1', 'created': 'Thu, 22 Feb 2018 14:42:42 GMT'}
{'version': 'v2', 'created': 'Fri, 2 Mar 2018 19:59:16 GMT'}
{'version': 'v3', 'created': 'Tue, 6 Mar 2018 01:49:32 GMT'}]
|
2018-03-07
|
[array(['de Alfaro', 'Luca', ''], dtype=object)
array(['Di Pierro', 'Massimo', ''], dtype=object)
array(['Agrawal', 'Rakshit', ''], dtype=object)
array(['Tacchini', 'Eugenio', ''], dtype=object)
array(['Ballarin', 'Gabriele', ''], dtype=object)
array(['Della Vedova', 'Marco L.', ''], dtype=object)
array(['Moret', 'Stefano', ''], dtype=object)]
|
6,895 |
2010.11268
|
Per Moosavi
|
Bastien Lapierre, Per Moosavi
|
Geometric approach to inhomogeneous Floquet systems
|
15 pages, REVTeX, 11 figures; final published version
|
Phys. Rev. B 103, 224303 (2021)
|
10.1103/PhysRevB.103.224303
| null |
cond-mat.stat-mech cond-mat.quant-gas hep-th math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a new geometric approach to Floquet many-body systems described by
inhomogeneous conformal field theory in 1+1 dimensions. It is based on an exact
correspondence with dynamical systems on the circle that we establish and use
to prove existence of (non)heating phases characterized by the (absence)
presence of fixed or higher-periodic points of coordinate transformations
encoding the time evolution: Heating corresponds to energy and excitations
concentrating exponentially fast at unstable such points while nonheating to
pseudoperiodic motion. We show that the heating rate (serving as the order
parameter for transitions between these two) can have cusps, even within the
overall heating phase, and that there is a rich structure of phase diagrams
with different heating phases distinguishable through kinks in the entanglement
entropy, reminiscent of Lifshitz phase transitions. Our geometric approach
generalizes previous results for a subfamily of similar systems that used only
the $\mathfrak{sl}(2)$ algebra to general smooth deformations that require the
full infinite-dimensional Virasoro algebra, and we argue that it has wider
applicability, even beyond conformal field theory.
|
[{'version': 'v1', 'created': 'Wed, 21 Oct 2020 19:40:11 GMT'}
{'version': 'v2', 'created': 'Tue, 8 Jun 2021 18:38:09 GMT'}]
|
2021-06-11
|
[array(['Lapierre', 'Bastien', ''], dtype=object)
array(['Moosavi', 'Per', ''], dtype=object)]
|
6,896 |
1307.5276
|
Bin Hu
|
Bin Hu, Michele Liguori, Nicola Bartolo, Sabino Matarrese
|
Parametrized modified gravity constraints after Planck
|
Match to the published version. Several numerical bugs about modified
gravity parameters removed, updated results are based on the analysis of new
chains. $B_0$ constraint become loose, other parameter bounds do not change.
One more figure added in order to explain the degeneracy of parameters
between $\beta_1$ and $B_0$ in the chameleon-type models
|
Phys. Rev. D 88, 123514 (2013)
|
10.1103/PhysRevD.88.123514
| null |
astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We constrain $f(R)$ and chameleon-type modified gravity in the framework of
the Berstchinger-Zukin parametrization using the recent released Planck data,
including both CMB temperature power spectrum and lensing potential power
spectrum. Some other external data sets are included, such as BAO measurements
from the 6dFGS, SDSS DR7 and BOSS DR9 surveys, HST $H_0$ measurement and
supernovae from Union2.1 compilation. We also use WMAP9yr data for consistency
check and comparison. For $f(R)$ gravity, WMAP9yr results can only give quite a
loose constraint on the modified gravity parameter $B_0$, which is related to
the present value of the Compton wavelength of the extra scalar degree of
freedom, $B_0<3.37$ at $95\% {\rm C.L.}$ We demonstrate that this constraint
mainly comes from the late ISW effect. With only Planck CMB temperature
power-spectrum data, we can improve the WMAP9yr result by a factor $3.7$
($B_0<0.91$ at $95\% {\rm C.L.}$). If the Planck lensing potential
power-spectrum data are also taken into account, the constraint can be further
strenghtened by a factor $5.1$ ($B_0<0.18$ at $95\% {\rm C.L.}$). This major
improvement mainly comes from the small-scale lensing signal. Furthermore, BAO,
HST and supernovae data could slightly improve the $B_0$ bound ($B_0<0.12$ at
$95\% {\rm C.L.}$).For the chameleon-type model, we find that the data set
which we used cannot constrain the Compton wavelength $B_0$ and the potential
index $s$ of chameleon field, but can give a tight constraint on the parameter
$\beta_1=1.043^{+0.163}_{-0.104}$ at $95\% {\rm C.L.}$ ($\beta_1=1$ in general
relativity), which accounts for the non-minimal coupling between the chameleon
field and the matter component. In addition, we find that both modified gravity
models we considered favor a relatively higher Hubble parameter than the
concordance LCDM model in general relativity.
|
[{'version': 'v1', 'created': 'Fri, 19 Jul 2013 16:38:22 GMT'}
{'version': 'v2', 'created': 'Tue, 30 Jul 2013 11:50:50 GMT'}
{'version': 'v3', 'created': 'Sat, 30 Nov 2013 13:20:53 GMT'}]
|
2013-12-16
|
[array(['Hu', 'Bin', ''], dtype=object)
array(['Liguori', 'Michele', ''], dtype=object)
array(['Bartolo', 'Nicola', ''], dtype=object)
array(['Matarrese', 'Sabino', ''], dtype=object)]
|
6,897 |
1704.00364
|
Caroline Soubiran
|
F. Crifo, C. Soubiran, G. Jasniewicz, D. Katz, P. Sartoretti, and P.
Panuzzo
|
HIP 21539 is not a past very close neighbour of the Sun
|
2 pages, accepted as a Letter by A&A
| null |
10.1051/0004-6361/201730521
| null |
astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Aims: A previous study claimed that the star HIP 21539 passed close to the
Sun, at a distance of 1.9 pc, around 0.14 Myr ago. We show that this is not the
case. Methods: We redetermined the trajectory of the star relative to the Sun
using a new accurate radial velocity from the HARPS spectrograph combined with
the recent Gaia-TGAS astrometry. Results: With this new data, the closest
approach of HIP 21539 to the Sun is now 17 pc, instead of 1.9 pc. Conclusions:
At this distance, the star has not perturbed the Oort cloud.
|
[{'version': 'v1', 'created': 'Sun, 2 Apr 2017 21:09:01 GMT'}]
|
2017-05-24
|
[array(['Crifo', 'F.', ''], dtype=object)
array(['Soubiran', 'C.', ''], dtype=object)
array(['Jasniewicz', 'G.', ''], dtype=object)
array(['Katz', 'D.', ''], dtype=object)
array(['Sartoretti', 'P.', ''], dtype=object)
array(['Panuzzo', 'P.', ''], dtype=object)]
|
6,898 |
hep-ph/0504013
|
Erhan Iltan
|
E. O. Iltan
|
The radiative lepton flavor violating decays in the split fermion
scenario in the two Higgs doublet model
|
19 pages, 7 Figures
|
Mod.Phys.Lett.A22:819-833,2007
|
10.1142/S0217732307021238
| null |
hep-ph
| null |
We study the branching ratios of the lepton flavor violating processes \mu ->
e \gamma, \tau -> e \gamma and \tau -> \mu\gamma in the split fermion scenario,
in the framework of the two Higgs doublet model. We observe that the branching
ratios are relatively more sensitive to the compactification scale and the
Gaussian widths of the leptons in the extra dimensions, for two extra
dimensions and especially for the \tau -> \mu \gamma decay.
|
[{'version': 'v1', 'created': 'Sun, 3 Apr 2005 11:17:14 GMT'}
{'version': 'v2', 'created': 'Mon, 24 Jul 2006 10:44:36 GMT'}
{'version': 'v3', 'created': 'Wed, 24 Jan 2007 11:42:13 GMT'}]
|
2008-11-26
|
[array(['Iltan', 'E. O.', ''], dtype=object)]
|
6,899 |
1411.4467
|
Philippe Michel G
|
Valentin Blomer, \'Etienne Fouvry, Emmanuel Kowalski, Philippe Michel
and Djordje Mili\'cevi\'c
|
On moments of twisted $L$-functions
|
final version; to appear in American Journal of Math
|
Amer. J. Math. 139 (2017) 707-768
|
10.1353/ajm.2017.0019
| null |
math.NT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the average of the product of the central values of two
$L$-functions of modular forms $f$ and $g$ twisted by Dirichlet characters to a
large prime modulus $q$. As our principal tools, we use spectral theory to
develop bounds on averages of shifted convolution sums with differences ranging
over multiples of $q$, and we use the theory of Deligne and Katz to estimate
certain complete exponential sums in several variables and prove new bounds on
bilinear forms in Kloosterman sums with power savings when both variables are
near the square root of $q$. When at least one of the forms $f$ and $g$ is
non-cuspidal, we obtain an asymptotic formula for the mixed second moment of
twisted $L$-functions with a power saving error term. In particular, when both
are non-cuspidal, this gives a significant improvement on M.~Young's asymptotic
evaluation of the fourth moment of Dirichlet $L$-functions. In the general
case, the asymptotic formula with a power saving is proved under a conjectural
estimate for certain bilinear forms in Kloosterman sums.
|
[{'version': 'v1', 'created': 'Mon, 17 Nov 2014 13:20:41 GMT'}
{'version': 'v2', 'created': 'Wed, 4 Nov 2015 13:41:46 GMT'}
{'version': 'v3', 'created': 'Sat, 9 Jan 2016 22:37:44 GMT'}]
|
2020-04-28
|
[array(['Blomer', 'Valentin', ''], dtype=object)
array(['Fouvry', 'Étienne', ''], dtype=object)
array(['Kowalski', 'Emmanuel', ''], dtype=object)
array(['Michel', 'Philippe', ''], dtype=object)
array(['Milićević', 'Djordje', ''], dtype=object)]
|
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