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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2,900 |
1701.06740
|
Nahee Park
|
VERITAS Collaboration: S. Archambault, A. Archer, W. Benbow, R. Bird,
E. Bourbeau, M. Buchovecky, J. H. Buckley, V. Bugaev, M. Cerruti, M. P.
Connolly, W. Cui, V. V. Dwarkadas, M. Errando, A. Falcone, Q. Feng, J. P.
Finley, H. Fleischhack, L. Fortson, A. Furniss, S. Griffin, M. Hutten, D.
Hanna, J. Holder, C. A. Johnson, P. Kaaret, P. Kar, N. Kelley-Hoskins, M.
Kertzman, D. Kieda, M. Krause, S. Kumar, M. J. Lang, G. Maier, S. McArthur,
A. McCann, P. Moriarty, R. Mukherjee, D. Nieto, S. O'Brien, R. A. Ong, A. N.
Otte, N. Park, M. Pohl, A. Popkow, E. Pueschel, J. Quinn, K. Ragan, P. T.
Reynolds, G. T. Richards, E. Roache, I. Sadeh, M. Santander, G. H. Sembroski,
K. Shahinyan, P. Slane, D. Staszak, I. Telezhinsky, S. Trepanier, J. Tyler,
S. P. Wakely, A. Weinstein, T. Weisgarber, P. Wilcox, A. Wilhelm, D. A.
Williams, B. Zitzer
|
Gamma-ray observations of Tycho's SNR with VERITAS and Fermi
|
Accepted for publication in The Astrophysical Journal
| null |
10.3847/1538-4357/836/1/23
| null |
astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
High-energy gamma-ray emission from supernova remnants (SNRs) has provided a
unique perspective for studies of Galactic cosmic-ray acceleration. Tycho's SNR
is a particularly good target because it is a young, type Ia SNR that is
well-studied over a wide range of energies and located in a relatively clean
environment. Since the detection of gamma-ray emission from Tycho's SNR by
VERITAS and Fermi-LAT, there have been several theoretical models proposed to
explain its broadband emission and high-energy morphology. We report on an
update to the gamma-ray measurements of Tycho's SNR with 147 hours of VERITAS
and 84 months of Fermi-LAT observations, which represents about a factor of two
increase in exposure over previously published data. About half of the VERITAS
data benefited from a camera upgrade, which has made it possible to extend the
TeV measurements toward lower energies. The TeV spectral index measured by
VERITAS is consistent with previous results, but the expanded energy range
softens a straight power-law fit. At energies higher than 400 GeV, the
power-law index is $2.92 \pm 0.42_{\mathrm{stat}} \pm 0.20_{\mathrm{sys}}$. It
is also softer than the spectral index in the GeV energy range, $2.14 \pm
0.09_{\mathrm{stat}} \pm 0.02_{\mathrm{sys}}$, measured by this study using
Fermi--LAT data. The centroid position of the gamma-ray emission is coincident
with the center of the remnant, as well as with the centroid measurement of
Fermi--LAT above 1 GeV. The results are consistent with an SNR shell origin of
the emission, as many models assume. The updated spectrum points to a lower
maximum particle energy than has been suggested previously.
|
[{'version': 'v1', 'created': 'Tue, 24 Jan 2017 06:04:42 GMT'}]
|
2017-08-22
|
[array(['VERITAS Collaboration', '', ''], dtype=object)
array(['Archambault', 'S.', ''], dtype=object)
array(['Archer', 'A.', ''], dtype=object)
array(['Benbow', 'W.', ''], dtype=object)
array(['Bird', 'R.', ''], dtype=object)
array(['Bourbeau', 'E.', ''], dtype=object)
array(['Buchovecky', 'M.', ''], dtype=object)
array(['Buckley', 'J. H.', ''], dtype=object)
array(['Bugaev', 'V.', ''], dtype=object)
array(['Cerruti', 'M.', ''], dtype=object)
array(['Connolly', 'M. P.', ''], dtype=object)
array(['Cui', 'W.', ''], dtype=object)
array(['Dwarkadas', 'V. V.', ''], dtype=object)
array(['Errando', 'M.', ''], dtype=object)
array(['Falcone', 'A.', ''], dtype=object)
array(['Feng', 'Q.', ''], dtype=object)
array(['Finley', 'J. P.', ''], dtype=object)
array(['Fleischhack', 'H.', ''], dtype=object)
array(['Fortson', 'L.', ''], dtype=object)
array(['Furniss', 'A.', ''], dtype=object)
array(['Griffin', 'S.', ''], dtype=object)
array(['H\x7futten', 'M.', ''], dtype=object)
array(['Hanna', 'D.', ''], dtype=object)
array(['Holder', 'J.', ''], dtype=object)
array(['Johnson', 'C. A.', ''], dtype=object)
array(['Kaaret', 'P.', ''], dtype=object)
array(['Kar', 'P.', ''], dtype=object)
array(['Kelley-Hoskins', 'N.', ''], dtype=object)
array(['Kertzman', 'M.', ''], dtype=object)
array(['Kieda', 'D.', ''], dtype=object)
array(['Krause', 'M.', ''], dtype=object)
array(['Kumar', 'S.', ''], dtype=object)
array(['Lang', 'M. J.', ''], dtype=object)
array(['Maier', 'G.', ''], dtype=object)
array(['McArthur', 'S.', ''], dtype=object)
array(['McCann', 'A.', ''], dtype=object)
array(['Moriarty', 'P.', ''], dtype=object)
array(['Mukherjee', 'R.', ''], dtype=object)
array(['Nieto', 'D.', ''], dtype=object)
array(["O'Brien", 'S.', ''], dtype=object)
array(['Ong', 'R. A.', ''], dtype=object)
array(['Otte', 'A. N.', ''], dtype=object)
array(['Park', 'N.', ''], dtype=object)
array(['Pohl', 'M.', ''], dtype=object)
array(['Popkow', 'A.', ''], dtype=object)
array(['Pueschel', 'E.', ''], dtype=object)
array(['Quinn', 'J.', ''], dtype=object)
array(['Ragan', 'K.', ''], dtype=object)
array(['Reynolds', 'P. T.', ''], dtype=object)
array(['Richards', 'G. T.', ''], dtype=object)
array(['Roache', 'E.', ''], dtype=object)
array(['Sadeh', 'I.', ''], dtype=object)
array(['Santander', 'M.', ''], dtype=object)
array(['Sembroski', 'G. H.', ''], dtype=object)
array(['Shahinyan', 'K.', ''], dtype=object)
array(['Slane', 'P.', ''], dtype=object)
array(['Staszak', 'D.', ''], dtype=object)
array(['Telezhinsky', 'I.', ''], dtype=object)
array(['Trepanier', 'S.', ''], dtype=object)
array(['Tyler', 'J.', ''], dtype=object)
array(['Wakely', 'S. P.', ''], dtype=object)
array(['Weinstein', 'A.', ''], dtype=object)
array(['Weisgarber', 'T.', ''], dtype=object)
array(['Wilcox', 'P.', ''], dtype=object)
array(['Wilhelm', 'A.', ''], dtype=object)
array(['Williams', 'D. A.', ''], dtype=object)
array(['Zitzer', 'B.', ''], dtype=object)]
|
2,901 |
1908.06481
|
Gareth Roberg-Clark
|
G. T. Roberg-Clark, O. V. Agapitov, J. F. Drake, M. M. Swisdak
|
Scattering of energetic electrons by heat-flux-driven whistlers in
flares
|
Accepted for publication in The Astrophysical Journal
| null |
10.3847/1538-4357/ab5114
| null |
physics.space-ph astro-ph.SR physics.plasm-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The scattering of electrons by heat-flux-driven whistler waves is explored
with a particle-in-cell (PIC) simulation relevant to the transport of energetic
electrons in flares. The simulation is initiated with a large heat flux that is
produced using a kappa distribution of electrons with positive velocity and a
cold return current beam. This system represents energetic electrons escaping
from a reconnection-driven energy release site. This heat flux system drives
large amplitude oblique whistler waves propagating both along and against the
heat flux, as well as electron acoustic waves. While the waves are dominantly
driven by the low energy electrons, including the cold return current beam, the
energetic electrons resonate with and are scattered by the whistlers on time
scales of the order of a hundred electron cyclotron times. Peak whistler
amplitudes of $\tilde{B} / B_{0} \sim 0.125$ and angles of $\sim 60 \degree$
with respect to the background magnetic field are observed. Electron
perpendicular energy is increased while the field-aligned electron heat flux is
suppressed. The resulting scattering mean-free-paths of energetic electrons are
small compared with the typical scale size of energy release sites in flares,
which might lead to the effective confinement of energetic electrons that is
required for the production of very energetic particles.
|
[{'version': 'v1', 'created': 'Sun, 18 Aug 2019 17:11:37 GMT'}
{'version': 'v2', 'created': 'Fri, 25 Oct 2019 14:21:48 GMT'}]
|
2019-12-19
|
[array(['Roberg-Clark', 'G. T.', ''], dtype=object)
array(['Agapitov', 'O. V.', ''], dtype=object)
array(['Drake', 'J. F.', ''], dtype=object)
array(['Swisdak', 'M. M.', ''], dtype=object)]
|
2,902 |
1510.03961
|
Aaron Mazel-Gee
|
Aaron Mazel-Gee
|
Hammocks and fractions in relative $\infty$-categories
| null | null | null | null |
math.AT math.CT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the *homotopy theory* of $\infty$-categories enriched in the
$\infty$-category $sS$ of simplicial spaces. That is, we consider $sS$-enriched
$\infty$-categories as presentations of ordinary $\infty$-categories by means
of a "local" geometric realization functor $Cat_{sS} \to Cat_\infty$, and we
prove that their homotopy theory presents the $\infty$-category of
$\infty$-categories, i.e. that this functor induces an equivalence $Cat_{sS} [[
W_{DK}^{-1} ]] \xrightarrow{\sim} Cat_\infty$ from a localization of the
$\infty$-category of $sS$-enriched $\infty$-categories.
Following Dwyer--Kan, we define a *hammock localization* functor from
relative $\infty$-categories to $sS$-enriched $\infty$-categories, thus
providing a rich source of examples of $sS$-enriched $\infty$-categories.
Simultaneously unpacking and generalizing one of their key results, we prove
that given a relative $\infty$-category admitting a *homotopical three-arrow
calculus*, one can explicitly describe the hom-spaces in the $\infty$-category
presented by its hammock localization in a much more explicit and accessible
way.
As an application of this framework, we give sufficient conditions for the
Rezk nerve of a relative $\infty$-category to be a (complete) Segal space,
generalizing joint work with Low.
|
[{'version': 'v1', 'created': 'Wed, 14 Oct 2015 04:16:30 GMT'}]
|
2015-10-15
|
[array(['Mazel-Gee', 'Aaron', ''], dtype=object)]
|
2,903 |
gr-qc/0610093
|
Edward Glass
|
E.N. Glass
|
Magnetovac Cylinder to Magnetovac Torus
|
to appear in Class. Quant. Grav
|
Class.Quant.Grav. 23 (2006) 7455-7470
|
10.1088/0264-9381/23/24/016
| null |
gr-qc
| null |
A method for mapping known cylindrical magnetovac solutions to solutions in
torus coordinates is developed. Identification of the cylinder ends changes
topology from R1 x S1 to S1 x S1. An analytic Einstein-Maxwell solution for a
toroidal magnetic field in tori is presented. The toroidal interior is matched
to an asymptotically flat vacuum exterior, connected by an Israel boundary
layer.
|
[{'version': 'v1', 'created': 'Wed, 18 Oct 2006 19:55:28 GMT'}]
|
2009-11-11
|
[array(['Glass', 'E. N.', ''], dtype=object)]
|
2,904 |
nucl-ex/0109020
|
Christopher L. Morris
|
C. L. Morris, J. M. Anaya, T. J. Bowles, B. W. Filippone, P.
Geltenbort, R. E. Hill, M. Hino, S. Hoedl, G. E. Hogan, T. M. Ito, T. Kawai,
K. Kirch, S. K. Lamoreaux, C.-Y. Liu, M. Makela, L. J. Marek, J. W. Martin,
R. N. Mortensen, A. Pichlmaier, A. Saunders, S. J. Seestrom, D. Smith, W.
Teasdale, B. Tipton, M. Utsuro, A. R. Young, J. Yuan
|
Measurements of ultracold neutron lifetimes in solid deuterium
|
5 pages, 3 figures, revtex4
|
Phys.Rev.Lett.89:272501,2002
|
10.1103/PhysRevLett.89.272501
|
LA-UR01-5169
|
nucl-ex
| null |
We present the first measurements of the survival time of ultracold neutrons
(UCNs) in solid deuterium SD2. This critical parameter provides a fundamental
limitation to the effectiveness of superthermal UCN sources that utilize solid
ortho-deuterium as the source material. Superthermal UCN sources offer orders
of magnitude improvement in the available densities of UCNs, and are of great
importance to fundamental particle-physics experiments such as searches for a
static electric dipole moment and lifetime measurements of the free neutron.
These measurements are performed utilizing a SD2 source coupled to a spallation
source of neutrons, providing a demonstration of UCN production in this
geometry and permitting systematic studies of the influence of thermal
up-scatter and contamination with para-deuterium on the UCN survival time.
|
[{'version': 'v1', 'created': 'Thu, 27 Sep 2001 19:20:07 GMT'}
{'version': 'v2', 'created': 'Fri, 28 Sep 2001 17:19:58 GMT'}]
|
2019-08-17
|
[array(['Morris', 'C. L.', ''], dtype=object)
array(['Anaya', 'J. M.', ''], dtype=object)
array(['Bowles', 'T. J.', ''], dtype=object)
array(['Filippone', 'B. W.', ''], dtype=object)
array(['Geltenbort', 'P.', ''], dtype=object)
array(['Hill', 'R. E.', ''], dtype=object)
array(['Hino', 'M.', ''], dtype=object)
array(['Hoedl', 'S.', ''], dtype=object)
array(['Hogan', 'G. E.', ''], dtype=object)
array(['Ito', 'T. M.', ''], dtype=object)
array(['Kawai', 'T.', ''], dtype=object)
array(['Kirch', 'K.', ''], dtype=object)
array(['Lamoreaux', 'S. K.', ''], dtype=object)
array(['Liu', 'C. -Y.', ''], dtype=object)
array(['Makela', 'M.', ''], dtype=object)
array(['Marek', 'L. J.', ''], dtype=object)
array(['Martin', 'J. W.', ''], dtype=object)
array(['Mortensen', 'R. N.', ''], dtype=object)
array(['Pichlmaier', 'A.', ''], dtype=object)
array(['Saunders', 'A.', ''], dtype=object)
array(['Seestrom', 'S. J.', ''], dtype=object)
array(['Smith', 'D.', ''], dtype=object)
array(['Teasdale', 'W.', ''], dtype=object)
array(['Tipton', 'B.', ''], dtype=object)
array(['Utsuro', 'M.', ''], dtype=object)
array(['Young', 'A. R.', ''], dtype=object)
array(['Yuan', 'J.', ''], dtype=object)]
|
2,905 |
2001.03390
|
Aleksandr Koryagin
|
Alexander Koryagin, Darima Mylzenova, Roman Khudorozhkov, Sergey
Tsimfer
|
Seismic horizon detection with neural networks
| null | null | null | null |
cs.CV eess.IV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Over the last few years, Convolutional Neural Networks (CNNs) were
successfully adopted in numerous domains to solve various image-related tasks,
ranging from simple classification to fine borders annotation. Tracking seismic
horizons is no different, and there are a lot of papers proposing the usage of
such models to avoid time-consuming hand-picking. Unfortunately, most of them
are (i) either trained on synthetic data, which can't fully represent the
complexity of subterranean structures, (ii) trained and tested on the same
cube, or (iii) lack reproducibility and precise descriptions of the
model-building process. With all that in mind, the main contribution of this
paper is an open-sourced research of applying binary segmentation approach to
the task of horizon detection on multiple real seismic cubes with a focus on
inter-cube generalization of the predictive model.
|
[{'version': 'v1', 'created': 'Fri, 10 Jan 2020 11:30:50 GMT'}]
|
2020-01-13
|
[array(['Koryagin', 'Alexander', ''], dtype=object)
array(['Mylzenova', 'Darima', ''], dtype=object)
array(['Khudorozhkov', 'Roman', ''], dtype=object)
array(['Tsimfer', 'Sergey', ''], dtype=object)]
|
2,906 |
1703.01494
|
Philipp di Dio
|
Philipp J. di Dio and Konrad Schm\"udgen
|
The multidimensional truncated Moment Problem: Carath\'eodory Numbers
| null |
J. Math. Anal. Appl. 461 (2018), 1606--1638
|
10.1016/j.jmaa.2017.12.021
| null |
math.FA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Let $\mathcal{A}$ be a finite-dimensional subspace of
$C(\mathcal{X};\mathbb{R})$, where $\mathcal{X}$ is a locally compact Hausdorff
space, and $\mathsf{A}=\{f_1,\dots,f_m\}$ a basis of $\mathcal{A}$. A sequence
$s=(s_j)_{j=1}^m$ is called a moment sequence if $s_j=\int f_j(x) \, d\mu(x)$,
$j=1,\dots,m$, for some positive Radon measure $\mu$ on $\mathcal{X}$. Each
moment sequence $s$ has a finitely atomic representing measure $\mu$. The
smallest possible number of atoms is called the Carath\'eodory number
$\mathcal{C}_{\mathsf{A}}(s)$. The largest number $\mathcal{C}_{\mathsf{A}}(s)$
among all moment sequences $s$ is the Carath\'eodory number
$\mathcal{C}_{\mathsf{A}}$. In this paper the Carath\'eodory numbers
$\mathcal{C}_{\mathsf{A}}(s)$ and $\mathcal{C}_{\mathsf{A}}$ are studied. In
the case of differentiable functions methods from differential geometry are
used. The main emphasis is on real polynomials. For a large class of spaces of
polynomials in one variable the number $\mathcal{C}_{\mathsf{A}}$ is
determined. In the multivariate case we obtain some lower bounds and we use
results on zeros of positive polynomials to derive upper bounds for the
Carath\'eodory numbers.
|
[{'version': 'v1', 'created': 'Sat, 4 Mar 2017 17:17:46 GMT'}
{'version': 'v2', 'created': 'Fri, 21 Apr 2017 07:41:08 GMT'}]
|
2018-04-20
|
[array(['di Dio', 'Philipp J.', ''], dtype=object)
array(['Schmüdgen', 'Konrad', ''], dtype=object)]
|
2,907 |
astro-ph/9805045
|
Ron Remillard
|
C. M. Becker (1), R. A. Remillard (1), S.A. Rappaport (1), and J.E.
McClintock (2) (1=(MIT), 2=(CFA))
|
Bipolar Jets and Orbital Dynamics of the Supersoft X-Ray Source RX
J0019.8+2156
|
49 pages, including 9 figs.; latex; aasms4.sty; revised manuscript
submitted to Astrophysical Journal, May 4, 1998
| null |
10.1086/306272
| null |
astro-ph
| null |
From 1994 to 1997 we monitored the optical spectrum of RXJ0019.8+2156. This
supersoft X-ray source is one of only two accreting white dwarfs in the Galaxy
thought to be burning hydrogen on their surface as a consequence of a high rate
of mass transfer from a binary companion. Accurate orbital ephemerides are
derived from radial velocity measure- ments of HeII emission lines, which
exhibit a stable velocity semi- amplitude of 71.2 +- 3.6 km/s. We report the
discovery of transient, low-velocity, bipolar jets. These jets are respresented
by redshifted and blueshifted pairs of emission lines with an outflow velocity
of v cos(i) = 815 km/s, where i is the binary inclination angle. When present,
the jet lines also exhibit an orbital modulation of 71 km/s, which indicates
that the jets are oriented nearly perpendicular to the orbital plane. On most
occasions, the Hline profiles are further altered by P Cygni absorption. We
show that the jets and the P Cygni features have very different temporal
characteristics and binary phase dependence. The jet material and the absorbing
wind must therefore occupy very different geometries. Finally, the measured
mass function is combined with binary evolution models to suggest a limit, i <
40 deg. A particular model invoked to explain a high rate of mass transfer
requires 16 < i < 25. However, at such small inclination it is difficult to
explain the large amplitude of the orbital light curve. By contrast, a simple
model fit to the jet outflow lines indicates an orbital inclination angle of 35
< i < 60.
|
[{'version': 'v1', 'created': 'Tue, 5 May 1998 18:36:45 GMT'}]
|
2009-10-30
|
[array(['Becker', 'C. M.', ''], dtype=object)
array(['Remillard', 'R. A.', ''], dtype=object)
array(['Rappaport', 'S. A.', ''], dtype=object)
array(['McClintock', 'J. E.', ''], dtype=object)]
|
2,908 |
1104.1152
|
Guang-Yu Guo
|
J. C. Tung, Y. K. Wang and G. Y. Guo
|
Magnetic anisotropy and spin-spiral wave in V, Cr and Mn atomic chains
on Cu(001) surface: First principles calculations
|
Accepted for publication in J. Phys. D: Applied Physics
|
J. Phys. D: Applied Phys. 44 (2011) 205003
|
10.1088/0022-3727/44/20/205003
| null |
cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent ab intio studies of the magnetic properties of all 3d transition
metal(TM) freestanding atomic chains predicted that these nanowires could have
a giant magnetic anisotropy energy (MAE) and might support a spin-spiral
structure, thereby suggesting that these nanowires would have technological
applicationsin, e.g., high density magnetic data storages. In order to
investigate how the substrates may affect the magnetic properties of the
nanowires, here we systematically study the V, Cr and Mn linear atomic chains
on the Cu(001) surface based on the density functional theory with the
generalized gradient approximation. We find that V, Cr, and Mn linear chains on
the Cu(001) surface still have a stable or metastable ferromagnetic state.
However, the ferromagnetic state is unstable against formation of a
noncollinear spin-spiral structure in the Mn linear chains and also the V
linear chain on the atop sites on the Cu(001) surface, due to the frustrated
magnetic interactions in these systems. Nonetheless, the presence of the
Cu(001) substrate does destabilize the spin-spiral state already present in the
freestanding V linear chain and stabilizes the ferromagnetic state in the V
linear chain on the hollow sites on Cu(001). When spin-orbit coupling (SOC) is
included, the spin magnetic moments remain almost unchanged, due to the
weakness of SOC in 3d TM chains. Furthermore, both the orbital magnetic moments
and MAEs for the V, Cr and Mn are small, in comparison with both the
corresponding freestanding nanowires and also the Fe, Co and Ni linear chains
on the Cu (001) surface.
|
[{'version': 'v1', 'created': 'Wed, 6 Apr 2011 17:24:58 GMT'}]
|
2015-05-27
|
[array(['Tung', 'J. C.', ''], dtype=object)
array(['Wang', 'Y. K.', ''], dtype=object)
array(['Guo', 'G. Y.', ''], dtype=object)]
|
2,909 |
1802.02982
|
Shiping Liu
|
David Cushing, Riikka Kangaslampi, Yong Lin, Shiping Liu, Linyuan Lu
and Shing-Tung Yau
|
Ricci-flat cubic graphs with girth five
| null | null | null | null |
math.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We classify all connected, simple, 3-regular graphs with girth at least 5
that are Ricci-flat. We use the definition of Ricci curvature on graphs given
in Lin-Lu-Yau, Tohoku Math., 2011, which is a variation of Ollivier, J. Funct.
Anal., 2009. A graph is Ricci-flat, if it has vanishing Ricci curvature on all
edges. We show, that the only Ricci-flat cubic graphs with girth at least 5 are
the Petersen graph, the Triplex and the dodecahedral graph. This will correct
the classification in Lin-Lu-Yau, Comm. Anal. Geom., 2014, that misses the
Triplex.
|
[{'version': 'v1', 'created': 'Thu, 8 Feb 2018 17:49:30 GMT'}]
|
2018-02-09
|
[array(['Cushing', 'David', ''], dtype=object)
array(['Kangaslampi', 'Riikka', ''], dtype=object)
array(['Lin', 'Yong', ''], dtype=object)
array(['Liu', 'Shiping', ''], dtype=object)
array(['Lu', 'Linyuan', ''], dtype=object)
array(['Yau', 'Shing-Tung', ''], dtype=object)]
|
2,910 |
0909.0975
|
Rowin Meijerink
|
R. Meijerink, K.M. Pontoppidan, G.A. Blake, D.R. Poelman, C.P.
Dullemond
|
Radiative transfer models of mid-infrared H2O lines in the
Planet-forming Region of Circumstellar Disks
|
12 pages, accepted for publication in ApJ
|
Astrophys.J.704:1471-1481,2009
|
10.1088/0004-637X/704/2/1471
| null |
astro-ph.EP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The study of warm molecular gas in the inner regions of protoplanetary disks
is of key importance for the study of planet formation and especially for the
transport of H2O and organic molecules to the surfaces of rocky
planets/satellites. Recent Spitzer observations have shown that the
mid-infrared spectra of protoplanetary disks are covered in emission lines due
to water and other molecules. Here, we present a non-LTE 2D radiative transfer
model of water lines in the 10-36 mum range that can be used to constrain the
abundance structure of water vapor, given an observed spectrum, and show that
an assumption of local thermodynamic equilibrium (LTE) does not accurately
estimate the physical conditions of the water vapor emission zones. By applying
the model to published Spitzer spectra we find that: 1) most water lines are
subthermally excited, 2) the gas-to-dust ratio must be one to two orders of
magnitude higher than the canonical interstellar medium ratio of 100-200, and
3) the gas temperature must be higher than the dust temperature, and 4) the
water vapor abundance in the disk surface must be truncated beyond ~ 1 AU. A
low efficiency of water formation below ~ 300 K may naturally result in a lower
water abundance beyond a certain radius. However, we find that chemistry, may
not be sufficient to produce an abundance drop of many orders of magnitude and
speculate that the depletion may also be caused by vertical turbulent diffusion
of water vapor from the superheated surface to regions below the snow line,
where the water can freeze out and be transported to the midplane as part of
the general dust settling. Such a vertical cold finger effect is likely to be
efficient due to the lack of a replenishment mechanism of large, water-ice
coated dust grains to the disk surface.
|
[{'version': 'v1', 'created': 'Fri, 4 Sep 2009 22:46:50 GMT'}]
|
2014-11-20
|
[array(['Meijerink', 'R.', ''], dtype=object)
array(['Pontoppidan', 'K. M.', ''], dtype=object)
array(['Blake', 'G. A.', ''], dtype=object)
array(['Poelman', 'D. R.', ''], dtype=object)
array(['Dullemond', 'C. P.', ''], dtype=object)]
|
2,911 |
1904.02523
|
Sandro Sozzo
|
Sandro Sozzo
|
Explaining versus Describing Human Decisions. Hilbert Space Structures
in Decision Theory
|
16 pages, 1 figure, LateX
| null | null | null |
q-bio.NC cs.AI quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Despite the impressive success of quantum structures to model long-standing
human judgement and decision puzzles, the {\it quantum cognition research
programme} still faces challenges about its explanatory power. Indeed, quantum
models introduce new parameters, which may fit empirical data without
necessarily explaining them. Also, one wonders whether more general
non-classical structures are better equipped to model cognitive phenomena. In
this paper, we provide a {\it realistic-operational foundation of decision
processes} using a known decision-making puzzle, the {\it Ellsberg paradox}, as
a case study. Then, we elaborate a novel representation of the Ellsberg
decision situation applying standard quantum correspondence rules which map
realistic-operational entities into quantum mathematical terms. This result
opens the way towards an independent, foundational rather than
phenomenological, motivation for a general use of quantum Hilbert space
structures in human cognition.
|
[{'version': 'v1', 'created': 'Thu, 4 Apr 2019 12:53:35 GMT'}]
|
2019-04-05
|
[array(['Sozzo', 'Sandro', ''], dtype=object)]
|
2,912 |
1207.1129
|
Teddy Cheung
|
C. C. Cheung, D. Donato, N. Gehrels, K. V. Sokolovsky, M. Giroletti
|
Chandra X-ray Observations of the Two Brightest Unidentified High
Galactic Latitude Fermi-LAT gamma-ray Sources
|
ApJ, accepted. 18 pages, 5 figures
| null |
10.1088/0004-637X/756/1/33
| null |
astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present Chandra ACIS-I X-ray observations of 0FGL J1311.9-3419 and 0FGL
J1653.4-0200, the two brightest high Galactic latitude (|b|>10 deg) gamma-ray
sources from the 3 month Fermi-LAT bright source list that are still
unidentified. Both were also detected previously by EGRET, and despite
dedicated multi-wavelength follow-up, they are still not associated with
established classes of gamma-ray emitters like pulsars or radio-loud active
galactic nuclei. X-ray sources found in the ACIS-I fields of view are
catalogued, and their basic properties are determined. These are discussed as
candidate counterparts to 0FGL J1311.9-3419 and 0FGL J1653.4-0200, with
particular emphasis on the brightest of the 9 and 13 Chandra sources detected
within their respective Fermi-LAT 95% confidence regions. Further follow-up
studies, including optical photometric and spectroscopic observations are
necessary to identify these X-ray candidate counterparts in order to ultimately
reveal the nature of these enigmatic gamma-ray objects.
|
[{'version': 'v1', 'created': 'Wed, 4 Jul 2012 21:42:57 GMT'}]
|
2015-06-05
|
[array(['Cheung', 'C. C.', ''], dtype=object)
array(['Donato', 'D.', ''], dtype=object)
array(['Gehrels', 'N.', ''], dtype=object)
array(['Sokolovsky', 'K. V.', ''], dtype=object)
array(['Giroletti', 'M.', ''], dtype=object)]
|
2,913 |
1104.3295
|
Shao-Ming Fei
|
Li-Li Lan, Xiang-Bin Wang and Shao-Ming Fei
|
Photon Induced Entanglement in Atom-Cavity Systems
|
12 pages
|
Int. J. Quant. Inform. 8 (2010) 1239-1250
|
10.1142/S0219749910006976
| null |
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the evolution of quantum entanglement in double cavity systems. The
entanglement of cavity atoms induced by entangled pair of photons is
investigated. Both entanglement sudden death and entanglement sudden birth
phenomena are shown to be existed and analyzed in detail. We also propose a
strategy to enhance the entanglement between the atom in one cavity and the
photon in another cavity by using quantum Zeno effect.
|
[{'version': 'v1', 'created': 'Sun, 17 Apr 2011 10:04:59 GMT'}]
|
2011-04-19
|
[array(['Lan', 'Li-Li', ''], dtype=object)
array(['Wang', 'Xiang-Bin', ''], dtype=object)
array(['Fei', 'Shao-Ming', ''], dtype=object)]
|
2,914 |
2203.04867
|
Jake Ayres
|
M. Berben, J. Ayres, C. Duffy, R. D. H. Hinlopen, Y.-T. Hsu, M.
Leroux, I. Gilmutdinov, M. Massoudzadegan, D. Vignolles, Y. Huang, T. Kondo,
T. Takeuchi, J. R. Cooper, S. Friedemann, A. Carrington, C. Proust, N. E.
Hussey
|
Compartmentalizing the cuprate strange metal
| null | null | null | null |
cond-mat.supr-con cond-mat.str-el
|
http://creativecommons.org/licenses/by/4.0/
|
It has long been recognized that the key to unlocking the mystery of cuprate
high-Tc superconductivity lies in understanding the anomalous normal state from
which pairs form and condense. While many of its defining properties have been
identified, they are often considered either at a singular doping level or as
an isolated phenomenon as a function of doping. As a result, their relation to
each other and to the pseudogap (PG), strange metal (SM) and
non-superconducting (non-SC) regimes that define the cuprate phase diagram has
yet to be elucidated. Here, we report a high-field in-plane MR study on several
cuprate families spanning all 3 regimes that reveal a complex yet nonetheless
systematic evolution of the form of the MR, with each regime possessing its own
distinct scaling behavior. In the PG regime, the MR exhibits pure H/T^2 scaling
at low fields and H-linearity at the highest field strengths. While the
H-linearity persists inside the SM regime, the scaling changes abruptly to H/T.
The size of the H-linear slope, meanwhile, is found to be correlated with both
the T-linear resistivity coefficient and Tc, strengthening the characterization
of the SM regime as a quantum critical phase. We interpret the omnipresence of
H-linear MR across both regimes as a signature of highly anisotropic, possibly
discontinuous features on the Fermi surface. Finally, within the non-SC,
Fermi-liquid regime, we observe a recovery of conventional Kohler scaling. This
comprehensive study establishes the distinct nature of the magnetotransport
within each regime and identifies power-law scaling of the normal state MR as a
defining feature of SC hole-doped cuprates. The incompatibility of such
power-law scaling with any known variant of Boltzmann transport theory
motivates the quest for an altogether new theoretical framework, one in which
the MR is entirely decoupled from elastic impurity scattering.
|
[{'version': 'v1', 'created': 'Wed, 9 Mar 2022 16:43:43 GMT'}
{'version': 'v2', 'created': 'Tue, 29 Nov 2022 11:08:16 GMT'}]
|
2022-11-30
|
[array(['Berben', 'M.', ''], dtype=object)
array(['Ayres', 'J.', ''], dtype=object)
array(['Duffy', 'C.', ''], dtype=object)
array(['Hinlopen', 'R. D. H.', ''], dtype=object)
array(['Hsu', 'Y. -T.', ''], dtype=object)
array(['Leroux', 'M.', ''], dtype=object)
array(['Gilmutdinov', 'I.', ''], dtype=object)
array(['Massoudzadegan', 'M.', ''], dtype=object)
array(['Vignolles', 'D.', ''], dtype=object)
array(['Huang', 'Y.', ''], dtype=object)
array(['Kondo', 'T.', ''], dtype=object)
array(['Takeuchi', 'T.', ''], dtype=object)
array(['Cooper', 'J. R.', ''], dtype=object)
array(['Friedemann', 'S.', ''], dtype=object)
array(['Carrington', 'A.', ''], dtype=object)
array(['Proust', 'C.', ''], dtype=object)
array(['Hussey', 'N. E.', ''], dtype=object)]
|
2,915 |
astro-ph/0506625
|
Tsutomu Takeuchi T.
|
Tsutomu T. Takeuchi, Takako T. Ishii, Takaya Nozawa, Takashi Kozasa,
Hiroyuki Hirashita
|
A model for the infrared dust emission from forming galaxies
|
MNRAS, in press. 18 pages, 15 figures. Abstract abridged
|
Mon.Not.Roy.Astron.Soc.362:592-608,2005
|
10.1111/j.1365-2966.2005.09337.x
| null |
astro-ph
| null |
In the early epoch of galaxy evolution, dust is only supplied by supernovae
(SNe). With the aid of a new physical model of dust production by SNe developed
by Nozawa et al. (2003) (N03), we constructed a model of dust emission from
forming galaxies on the basis of the theoretical framework of Takeuchi et al.
(2003) (T03). N03 showed that the produced dust species depends strongly on the
mixing within SNe. We treated both unmixed and mixed cases and calculated the
infrared (IR) spectral energy distribution (SED) of forming galaxies for both
cases. Our model SED is less luminous than the SED of T03 model by a factor of
2-3. The difference is due to our improved treatment of UV photon absorption
cross section, as well as different grain size and species newly adopted in
this work. The SED for the unmixed case is found to have an enhanced near to
mid-IR (N-MIR) continuum radiation in its early phase of the evolution (age <
10^{7.25} yr) compared with that for the mixed case. The strong N--MIR
continuum is due to the emission from Si grains, which only exist in the
species of the unmixed dust production. We also calculated the IR extinction
curves for forming galaxies. Then we calculated the SED of a local starbursting
dwarf galaxy SBS 0335-052. Our present model SED naturally reproduced the
strong N--MIR continuum and the lack of cold FIR emission of SBS 0335-052. We
found that only the SED of unmixed case can reproduce the NIR continuum of this
galaxy. We then made a prediction for the SED of another typical star-forming
dwarf, I Zw 18. We also presented the evolution of the SED of LBGs. Finally, we
discussed the possibility of observing forming galaxies at z > 5.
|
[{'version': 'v1', 'created': 'Sat, 25 Jun 2005 13:51:33 GMT'}]
|
2009-11-13
|
[array(['Takeuchi', 'Tsutomu T.', ''], dtype=object)
array(['Ishii', 'Takako T.', ''], dtype=object)
array(['Nozawa', 'Takaya', ''], dtype=object)
array(['Kozasa', 'Takashi', ''], dtype=object)
array(['Hirashita', 'Hiroyuki', ''], dtype=object)]
|
2,916 |
1307.7320
|
Fang Fei
|
Fei Fang
|
On Schr\"odinger equations with periodic potentials and with nonperiodic
nonlinearities
|
This paper has been withdrawn by the author due to a crucial sign
error in equation
| null | null | null |
math.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the Schr\"{o}dinger equation $-\Delta u +V(x)u=f(x, u)$, where
$V$ is periodic and $f$ is non-periodic, 0 is a boundary point of the
continuous spectrum of $A:=-\Delta +V(x)$. We use M. Willem and W. M. Zou's
linking theorem and M. Schechter's method to establish an existence result for
this problem in weak superlinear cases. In a sense, we enrich a recent result
of M. Willem and W.M. Zou [M. Willem and W.M. Zou, On a Schr\"{o}dinger
Equation with Periodic Potential and Spectrum Point Zero,Indiana Univ. Math. J.
2003].
|
[{'version': 'v1', 'created': 'Sat, 27 Jul 2013 23:11:40 GMT'}
{'version': 'v2', 'created': 'Tue, 29 Oct 2013 02:24:00 GMT'}]
|
2013-10-30
|
[array(['Fang', 'Fei', ''], dtype=object)]
|
2,917 |
0901.1048
|
Joshua Stoker
|
J. B. Stoker, P. F. Mantica, D. Bazin, A. Becerril, J. S. Berryman, H.
L. Crawford, A. Estrade, C. J. Guess, G. W. Hitt, G. Lorusso, M. Matos, K.
Minamisono, F. Montes, J. Pereira, G. Perdikakis, H. Schatz, K. Smith, R. G.
T. Zegers
|
$\beta$-Decay Half-Life of the $rp$-Process Waiting Point Nuclide
$^{84}$Mo
|
Accepted for publication in PRC
|
Phys.Rev.C79:015803,2009
|
10.1103/PhysRevC.79.015803
| null |
nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A half-life of 2.2 $\pm$ 0.2 s has been deduced for the ground-state $\beta$
decay of $^{84}$Mo, more than 1$\sigma$ shorter than the previously adopted
value. $^{84}$Mo is an even-even N = Z nucleus lying on the proton dripline,
created during explosive hydrogen burning in Type I X-ray bursts in the rapid
proton capture ($rp$) process. The effect of the measured half-life on
$rp$-process reaction flow is explored. Implications on theoretical treatments
of nuclear deformation in $^{84}$Mo are also discussed.
|
[{'version': 'v1', 'created': 'Thu, 8 Jan 2009 14:12:56 GMT'}]
|
2009-01-28
|
[array(['Stoker', 'J. B.', ''], dtype=object)
array(['Mantica', 'P. F.', ''], dtype=object)
array(['Bazin', 'D.', ''], dtype=object)
array(['Becerril', 'A.', ''], dtype=object)
array(['Berryman', 'J. S.', ''], dtype=object)
array(['Crawford', 'H. L.', ''], dtype=object)
array(['Estrade', 'A.', ''], dtype=object)
array(['Guess', 'C. J.', ''], dtype=object)
array(['Hitt', 'G. W.', ''], dtype=object)
array(['Lorusso', 'G.', ''], dtype=object)
array(['Matos', 'M.', ''], dtype=object)
array(['Minamisono', 'K.', ''], dtype=object)
array(['Montes', 'F.', ''], dtype=object)
array(['Pereira', 'J.', ''], dtype=object)
array(['Perdikakis', 'G.', ''], dtype=object)
array(['Schatz', 'H.', ''], dtype=object)
array(['Smith', 'K.', ''], dtype=object)
array(['Zegers', 'R. G. T.', ''], dtype=object)]
|
2,918 |
2102.00914
|
Xiu-Lei Ren
|
X.-L. Ren, E. Epelbaum, J. Gegelia, and Ulf-G. Mei{\ss}ner
|
The $\Lambda(1405)$ in resummed chiral effective field theory
|
16 pages, 3 figures, 5 tables
| null |
10.1140/epjc/s10052-021-09386-0
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the unitarized meson-baryon scattering amplitude at leading order in
the strangeness $S=-1$ sector using time-ordered perturbation theory for a
manifestly Lorentz-invariant formulation of chiral effective field theory. By
solving the coupled-channel integral equations with the full off-shell
dependence of the effective potential and applying subtractive renormalization,
we analyze the renormalized scattering amplitudes and obtain the two-pole
structure of the $\Lambda(1405)$ resonance. We also point out the necessity of
including higher-order terms.
|
[{'version': 'v1', 'created': 'Mon, 1 Feb 2021 15:34:45 GMT'}]
|
2021-07-21
|
[array(['Ren', 'X. -L.', ''], dtype=object)
array(['Epelbaum', 'E.', ''], dtype=object)
array(['Gegelia', 'J.', ''], dtype=object)
array(['Meißner', 'Ulf-G.', ''], dtype=object)]
|
2,919 |
1210.4570
|
Katherine Rhode
|
Katherine L. Rhode (Indiana University)
|
Exploring the Correlations between Globular Cluster Populations and
Supermassive Black Holes in Giant Galaxies
|
21 pages, 7 figures, 3 tables; accepted to The Astronomical Journal
| null |
10.1088/0004-6256/144/5/154
| null |
astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper presents an analysis of the correlation between the number of
globular clusters (N_GC) in giant galaxies and the mass of the galaxies'
central supermassive black hole (M_SMBH). I construct a sample of 20
elliptical, spiral, and S0 galaxies with known SMBH masses and with
accurately-measured globular cluster system properties derived from wide-field
imaging studies. The coefficients of the best-fitting N_GC-M_SMBH relation for
the early-type galaxies are consistent with those from previous work but in
some cases have smaller relative errors. I examine the correlation between N_GC
and M_SMBH for various subsamples and find that elliptical galaxies show the
strongest correlation while S0 and pseudobulge galaxies exhibit increased
scatter. I also compare the quality of the fit of the numbers of metal-poor
globular clusters versus SMBH mass and the corresponding fit for metal-rich
globular clusters. I supplement the 20-galaxy sample with ten additional
galaxies with reliable N_GC determinations but without measured M_SMBH. I use
this larger sample to investigate correlations between N_GC and host galaxy
properties like total galaxy luminosity and stellar mass and bulge luminosity
and mass. I find that the tightest correlation is between N_GC and total galaxy
stellar mass. This lends support to the notion that N_GC and M_SMBH are not
directly linked but are correlated because both quantities depend on the host
galaxy potential. Finally, I use the N_GC-M_SMBH relation derived from the
20-galaxy sample to calculate predicted M_SMBH values for the ten galaxies with
accurate N_GC measurements but without measured SMBH masses.
|
[{'version': 'v1', 'created': 'Tue, 16 Oct 2012 20:36:15 GMT'}]
|
2015-06-11
|
[array(['Rhode', 'Katherine L.', '', 'Indiana University'], dtype=object)]
|
2,920 |
2009.04443
|
James Dent
|
James B. Dent, Thomas W. Kephart, Heinrich P\"as, Thomas J. Weiler
|
Flipped Quartification and a composite $b$-quark
|
11 pages
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An alternative "flipped" version of the quartification model is obtained by
rearrangement of the particle assignments. The model has two standard
(trinification) families and one flipped quartification family. An interesting
phenomenological implication is that the model allows for a composite
$b$-quark.
|
[{'version': 'v1', 'created': 'Wed, 9 Sep 2020 17:45:35 GMT'}]
|
2020-09-10
|
[array(['Dent', 'James B.', ''], dtype=object)
array(['Kephart', 'Thomas W.', ''], dtype=object)
array(['Päs', 'Heinrich', ''], dtype=object)
array(['Weiler', 'Thomas J.', ''], dtype=object)]
|
2,921 |
math/0312264
|
Carla Dionisi
|
Carla Dionisi
|
Stabilizers for nondegenerate matrices of boundary format and Steiner
bundles
|
14 pages, Latex
| null | null | null |
math.AG
| null |
In this paper nondegenerate multidimensional matrices of boundary format in
$V_0 \otimes ... \otimes V_p$ are investigated by their link with Steiner
vector bundles on product of projective spaces. For any nondegenerate matrix
$A$ the stabilizer for the $SL(V_0)\times ... \times SL(V_p)$-action,
$Stab(A)$, is completely described. In particular we prove that there exists an
explicit action of SL(2) on $V_0 \otimes ... \otimes V_p$ such that
$Stab(A)^0\subseteq SL(2)$ and the equality holds if and only if $A$ belongs to
a unique $SL(V_0)\times >... \times SL(V_p)$-orbit containing the identity
matrices.
|
[{'version': 'v1', 'created': 'Fri, 12 Dec 2003 17:33:04 GMT'}
{'version': 'v2', 'created': 'Tue, 16 Dec 2003 12:12:39 GMT'}]
|
2007-05-23
|
[array(['Dionisi', 'Carla', ''], dtype=object)]
|
2,922 |
2207.07523
|
Mark Rudelson
|
Xiaoyu Dong and Mark Rudelson
|
Approximately Hadamard matrices and Riesz bases in random frames
| null | null | null | null |
math.PR cs.NA math.NA
|
http://creativecommons.org/licenses/by/4.0/
|
An $n \times n$ matrix with $\pm 1$ entries which acts on $\mathbb{R}^n$ as a
scaled isometry is called Hadamard. Such matrices exist in some, but not all
dimensions. Combining number-theoretic and probabilistic tools we construct
matrices with $\pm 1$ entries which act as approximate scaled isometries in
$\mathbb{R}^n$ for all $n$. More precisely, the matrices we construct have
condition numbers bounded by a constant independent of $n$.
Using this construction, we establish a phase transition for the probability
that a random frame contains a Riesz basis. Namely, we show that a random frame
in $\mathbb{R}^n$ formed by $N$ vectors with independent identically
distributed coordinates having a non-degenerate symmetric distribution contains
many Riesz bases with high probability provided that $N \ge \exp(Cn)$. On the
other hand, we prove that if the entries are subgaussian, then a random frame
fails to contain a Riesz basis with probability close to $1$ whenever $N \le
\exp(cn)$, where $c<C$ are constants depending on the distribution of the
entries.
|
[{'version': 'v1', 'created': 'Fri, 15 Jul 2022 15:16:00 GMT'}
{'version': 'v2', 'created': 'Thu, 9 Mar 2023 13:03:22 GMT'}]
|
2023-03-10
|
[array(['Dong', 'Xiaoyu', ''], dtype=object)
array(['Rudelson', 'Mark', ''], dtype=object)]
|
2,923 |
cond-mat/0405582
|
Samuel Wehrli
|
Samuel Wehrli, T.M. Rice, Manfred Sigrist
|
Theory of the different photoemission spectra of metallic and insulating
C60 compounds
|
4 pages, 2 figures
| null |
10.1103/PhysRevB.70.233412
| null |
cond-mat.str-el
| null |
Metallic K3C60 shows pronounced structure and a sharp Fermi edge in
integrated photoemission spectra (PES) while the insulating K4C60 and K6C60
phases display only a broad structureless peak. We find that both types of
spectra can be explained by the coupling to the optic vibrations of the
K+/C60n- ionic lattice. This is suppressed in K3C60 due to metallic screening
but is strong in the insulating phases. We use the non-crossing approximation
to calculate the density of states (DOS) of electrons in K3C60 coupled to the
intramolecular Hg modes in good agreement with the experiment. For K4C60 and
K6C60 strong coupling to the low energy optic K+/C60n- modes controls the DOS
and yields broad peaks in the PES. A moment expansion is used to calculate the
position and width of these peaks which agree well with the experiment.
|
[{'version': 'v1', 'created': 'Tue, 25 May 2004 13:46:32 GMT'}]
|
2009-11-10
|
[array(['Wehrli', 'Samuel', ''], dtype=object)
array(['Rice', 'T. M.', ''], dtype=object)
array(['Sigrist', 'Manfred', ''], dtype=object)]
|
2,924 |
1209.2097
|
Nadja Kutz
|
Nadja Kutz
|
Semantic web applications with regard to math and environment
|
17 pages, 2 figures
| null | null | null |
cs.DL cs.IR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The following is an outline of possible strategies in using semantic web
techniques and math with regard to environmental issues. The article uses
concrete examples and applications and provides partially a rather basic
treatment of semantic web techniques and math in order to adress a broader
audience.
|
[{'version': 'v1', 'created': 'Fri, 7 Sep 2012 10:27:48 GMT'}]
|
2012-09-11
|
[array(['Kutz', 'Nadja', ''], dtype=object)]
|
2,925 |
0708.1505
|
Dominik Janzing
|
Dominik Janzing and Thomas Decker
|
How much is a quantum controller controlled by the controlled system?
|
17 pages, references added, results slightly improved
| null | null | null |
quant-ph
| null |
We consider unitary transformations on a bipartite system A x B. To what
extent entails the ability to transmit information from A to B the ability to
transfer information in the converse direction? We prove a dimension-dependent
lower bound on the classical channel capacity C(A<--B) in terms of the capacity
C(A-->B) for the case that the bipartite unitary operation consists of
controlled local unitaries on B conditioned on basis states on A. This can be
interpreted as a statement on the strength of the inevitable backaction of a
quantum system on its controller.
If the local operations are given by the regular representation of a finite
group G we have C(A-->B)=log |G| and C(A<--B)=log N where N is the sum over the
degrees of all inequivalent representations. Hence the information deficit
C(A-->B)-C(A<--B) between the forward and the backward capacity depends on the
"non-abelianness" of the control group. For regular representations, the ratio
between backward and forward capacities cannot be smaller than 1/2. The
symmetric group S_n reaches this bound asymptotically. However, for the general
case (without group structure) all bounds must depend on the dimensions since
it is known that the ratio can tend to zero.
|
[{'version': 'v1', 'created': 'Fri, 10 Aug 2007 19:40:16 GMT'}
{'version': 'v2', 'created': 'Tue, 21 Aug 2007 00:07:40 GMT'}]
|
2007-08-21
|
[array(['Janzing', 'Dominik', ''], dtype=object)
array(['Decker', 'Thomas', ''], dtype=object)]
|
2,926 |
2105.06710
|
Tomoya Akamatsu
|
Tomoya Akamatsu
|
A new transport distance and its associated Ricci curvature of
hypergraphs
|
15 pages; minor revisions, to appear in Anal. Geom. Metr. Spaces
|
Anal. Geom. Metr. Spaces 10 (2022) 90-108
|
10.1515/agms-2022-0135
| null |
math.MG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The coarse Ricci curvature of graphs introduced by Ollivier as well as its
modification by Lin-Lu-Yau have been studied from various aspects. In this
paper, we propose a new transport distance appropriate for hypergraphs and
study a generalization of Lin-Lu-Yau type curvature of hypergraphs. As an
application, we derive a Bonnet-Myers type estimate for hypergraphs under a
lower Ricci curvature bound associated with our transport distance. We remark
that our transport distance is new even for graphs and worthy of further study.
|
[{'version': 'v1', 'created': 'Fri, 14 May 2021 08:45:45 GMT'}
{'version': 'v2', 'created': 'Sun, 5 Jun 2022 08:58:44 GMT'}]
|
2022-06-07
|
[array(['Akamatsu', 'Tomoya', ''], dtype=object)]
|
2,927 |
physics/9811011
|
Lars Petter Endresen
|
L.P. Endresen, K. Hall, J.S. Hoye, and J. Myrheim
|
A Theory for the Membrane Potential of Living Cells
|
22 pages and 3 figures
| null | null | null |
physics.bio-ph physics.class-ph q-bio
| null |
We give an explicit formula for the membrane potential of cells in terms of
the intracellular and extracellular ionic concentrations, and derive equations
for the ionic currents that flow through channels, exchangers and electrogenic
pumps. We demonstrate that the work done by the pumps equals the change in
potential energy of the cell, plus the energy lost in downhill ionic fluxes
through the channels and exchangers. The theory is illustrated in a simple
model of spontaneously active cells in the cardiac pacemaker. The model
predicts the experimentally observed intracellular ionic concentration of
potassium, calcium, and sodium. Likewise the shapes of the simulated action
potential and five membrane currents are in good agreement with experiments. We
do not see any drift in the values of the concentrations in a long time
simulation, and we obtain the same asymptotic values when starting from the
full equilibrium situation with equal intracellular and extracellular ionic
concentrations.
|
[{'version': 'v1', 'created': 'Thu, 5 Nov 1998 17:22:32 GMT'}]
|
2007-05-23
|
[array(['Endresen', 'L. P.', ''], dtype=object)
array(['Hall', 'K.', ''], dtype=object)
array(['Hoye', 'J. S.', ''], dtype=object)
array(['Myrheim', 'J.', ''], dtype=object)]
|
2,928 |
astro-ph/9912182
|
Douglas Scott
|
Sara Seager, Dimitar D. Sasselov and Douglas Scott
|
How exactly did the Universe become neutral?
|
24 pages, including 18 figures, using emulateapj.sty, to appear in
ApJ, the code recfast can be obtained at
http://www.astro.ubc.ca/people/scott/recfast.html (in FORTRAN) and
http://cfa-www.harvard.edu/~sasselov/rec/ (in C)
|
Astrophys.J.Suppl. 128 (2000) 407-430
|
10.1086/313388
|
UBC-COS-99-07
|
astro-ph
| null |
We present a refined treatment of H, He I, and He II recombination in the
early Universe. The difference from previous calculations is that we use
multi-level atoms and evolve the population of each level with redshift by
including all bound-bound and bound-free transitions. In this framework we
follow several hundred atomic energy levels for H, He I, and He II combined.
The main improvements of this method over previous recombination calculations
are: (1) allowing excited atomic level populations to depart from an
equilibrium distribution; (2) replacing the total recombination coefficient
with recombination to and photoionization from each level directly at each
redshift step; and (3) correct treatment of the He I atom, including the
triplet and singlet states. We find that the ionization fraction x_e = n_e/n_H
is approximately 10% smaller at redshifts <~800 than in previous calculations,
due to the non-equilibrium of the excited states of H, which is caused by the
strong but cool radiation field at those redshifts. In addition we find that He
I recombination is delayed compared with previous calculations, and occurs only
just before H recombination. These changes in turn can affect the predicted
power spectrum of microwave anisotropies at the few percent level. Other
improvements such as including molecular and ionic species of H, including
complete heating and cooling terms for the evolution of the matter temperature,
including collisional rates, and including feedback of the secondary spectral
distortions on the radiation field, produce negligible change to x_e. The lower
x_e at low z found in this work affects the abundances of H molecular and ionic
species by 10-25%. However this difference is probably not larger than other
uncertainties in the reaction rates.
|
[{'version': 'v1', 'created': 'Thu, 9 Dec 1999 05:40:39 GMT'}
{'version': 'v2', 'created': 'Fri, 10 Dec 1999 01:07:12 GMT'}]
|
2009-10-31
|
[array(['Seager', 'Sara', ''], dtype=object)
array(['Sasselov', 'Dimitar D.', ''], dtype=object)
array(['Scott', 'Douglas', ''], dtype=object)]
|
2,929 |
1711.04902
|
Kai Zhou
|
Kai Zhou and Jian Ren
|
PassBio: Privacy-Preserving User-Centric Biometric Authentication
| null | null | null | null |
cs.CR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The proliferation of online biometric authentication has necessitated
security requirements of biometric templates. The existing secure biometric
authentication schemes feature a server-centric model, where a service provider
maintains a biometric database and is fully responsible for the security of the
templates. The end-users have to fully trust the server in storing, processing
and managing their private templates. As a result, the end-users' templates
could be compromised by outside attackers or even the service provider itself.
In this paper, we propose a user-centric biometric authentication scheme
(PassBio) that enables end-users to encrypt their own templates with our
proposed light-weighted encryption scheme. During authentication, all the
templates remain encrypted such that the server will never see them directly.
However, the server is able to determine whether the distance of two encrypted
templates is within a pre-defined threshold. Our security analysis shows that
no critical information of the templates can be revealed under both passive and
active attacks. PassBio follows a "compute-then-compare" computational model
over encrypted data. More specifically, our proposed Threshold Predicate
Encryption (TPE) scheme can encrypt two vectors x and y in such a manner that
the inner product of x and y can be evaluated and compared to a pre-defined
threshold. TPE guarantees that only the comparison result is revealed and no
key information about x and y can be learned. Furthermore, we show that TPE can
be utilized as a flexible building block to evaluate different distance metrics
such as Hamming distance and Euclidean distance over encrypted data. Such a
compute-then-compare computational model, enabled by TPE, can be widely applied
in many interesting applications such as searching over encrypted data while
ensuring data security and privacy.
|
[{'version': 'v1', 'created': 'Tue, 14 Nov 2017 01:37:05 GMT'}]
|
2017-11-15
|
[array(['Zhou', 'Kai', ''], dtype=object)
array(['Ren', 'Jian', ''], dtype=object)]
|
2,930 |
1802.01372
|
Odysseas Bakas
|
Odysseas Bakas, Salvador Rodriguez-Lopez, Alan Sola
|
Multi-parameter extensions of a theorem of Pichorides
|
12 pages
|
Proceedings of the American Mathematical Society 147 (2019),
1081-1095
|
10.1090/proc/14251
| null |
math.CA math.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Extending work of Pichorides and Zygmund to the $d$-dimensional setting, we
show that the supremum of $L^p$-norms of the Littlewood-Paley square function
over the unit ball of the analytic Hardy spaces $H^p_A(\mathbb{T}^d)$ blows up
like $(p-1)^{-d}$ as $p\to 1^+$. Furthermore, we obtain an $L\log^d L$-estimate
for square functions on $H^1_A(\mathbb{T}^d)$. Euclidean variants of
Pichorides's theorem are also obtained.
|
[{'version': 'v1', 'created': 'Mon, 5 Feb 2018 12:59:02 GMT'}
{'version': 'v2', 'created': 'Fri, 23 Feb 2018 17:23:44 GMT'}]
|
2018-12-27
|
[array(['Bakas', 'Odysseas', ''], dtype=object)
array(['Rodriguez-Lopez', 'Salvador', ''], dtype=object)
array(['Sola', 'Alan', ''], dtype=object)]
|
2,931 |
1404.6067
|
Johannes Carmesin
|
Nathan Bowler, Johannes Carmesin
|
On the intersection conjecture for infinite trees of matroids
| null | null | null | null |
math.CO math.LO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using a new technique, we prove a rich family of special cases of the matroid
intersection conjecture. Roughly, we prove the conjecture for pairs of tame
matroids which have a common decomposition by 2-separations into finite parts.
|
[{'version': 'v1', 'created': 'Thu, 24 Apr 2014 09:47:00 GMT'}]
|
2014-04-25
|
[array(['Bowler', 'Nathan', ''], dtype=object)
array(['Carmesin', 'Johannes', ''], dtype=object)]
|
2,932 |
0901.4832
|
Jian-Zu Zhang
|
Jian-Zu Zhang
|
Angular Momentum of Supersymmetric Cold Rydberg Atoms
|
11 pages, no figure
|
Phys.Rev.Lett.77:44-47,1996
|
10.1103/PhysRevLett.77.44
| null |
hep-th quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Semiunitary transformation is applied to discuss supersymmetrization of cold
Rydberg atoms. In the limit of vanishing kinetic energy the lowest angular
momentum of the supersymmetric cold Rydberg atom is $3\hbar/2$. A possible
experimental verification is suggested.
|
[{'version': 'v1', 'created': 'Fri, 30 Jan 2009 07:46:50 GMT'}]
|
2011-07-28
|
[array(['Zhang', 'Jian-Zu', ''], dtype=object)]
|
2,933 |
1807.08568
|
Ceyhun Bulutay
|
Shahnaz Aas and Ceyhun Bulutay
|
Strain dependence of photoluminescence and circular dichroism in
transition metal dichalcogenides: a k.p analysis
|
Revised, 10 pages, 3 figures; published version
|
Opt. Express 26(22), 28672-28681 (2018)
|
10.1364/OE.26.028672
| null |
cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Within a two-band $k\cdot p$ method we analyze different types of strain for
the $K$ valley optical characteristics of a freestanding monolayer MoS$_2$,
MoSe$_2$, WS$_2$ and WSe$_2$. We predict that circular polarization selectivity
for energies above the direct transition onset deteriorates/improves by
tensile/compressive strain. Wide range of available strained-sample
photoluminescence data can be reasonably reproduced by this simple
bandstructure combined with accounting for excitons at a variational level.
According to this model strain impacts optoelectronic properties through its
hydrostatic component, whereas the shear strain only causes a rigid wavevector
shift of the valley. Furthermore, under the stress loading of flexible
substrates the presence of Poisson's effect or the lack of it are examined
individually for the reported measurements.
|
[{'version': 'v1', 'created': 'Mon, 23 Jul 2018 12:46:27 GMT'}
{'version': 'v2', 'created': 'Mon, 22 Oct 2018 14:10:14 GMT'}]
|
2018-10-23
|
[array(['Aas', 'Shahnaz', ''], dtype=object)
array(['Bulutay', 'Ceyhun', ''], dtype=object)]
|
2,934 |
1712.00213
|
Chunhua Shen
|
Zifeng Wu, Chunhua Shen, Anton van den Hengel
|
Real-time Semantic Image Segmentation via Spatial Sparsity
| null | null | null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose an approach to semantic (image) segmentation that reduces the
computational costs by a factor of 25 with limited impact on the quality of
results. Semantic segmentation has a number of practical applications, and for
most such applications the computational costs are critical. The method follows
a typical two-column network structure, where one column accepts an input
image, while the other accepts a half-resolution version of that image. By
identifying specific regions in the full-resolution image that can be safely
ignored, as well as carefully tailoring the network structure, we can process
approximately 15 highresolution Cityscapes images (1024x2048) per second using
a single GTX 980 video card, while achieving a mean intersection-over-union
score of 72.9% on the Cityscapes test set.
|
[{'version': 'v1', 'created': 'Fri, 1 Dec 2017 07:15:28 GMT'}]
|
2017-12-04
|
[array(['Wu', 'Zifeng', ''], dtype=object)
array(['Shen', 'Chunhua', ''], dtype=object)
array(['Hengel', 'Anton van den', ''], dtype=object)]
|
2,935 |
1807.04519
|
Chandra Singh Dr.
|
Chandra B. Singh, David Garofalo and Elisabete M. de Gouveia Dal Pino
|
Magnetic reconnection and Blandford-Znajek process around rotating black
holes
|
7 pages, 3 figures, Accepted for publication in the MNRAS main
journal
| null |
10.1093/mnras/sty1405
| null |
astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We provide a semi-analytic comparison between the Blandford-Znajek (BZ) and
the magnetic reconnection power for accreting black holes in the curved
spacetime of a rotating black hole. Our main result is that for a realistic
range of astrophysical parameters, the reconnection power may compete with the
BZ power. The field lines anchored close to or on the black hole usually evolve
to open field lines in general relativistic magnetohydrodynamic (GRMHD)
simulations. The BZ power is dependent on the black hole spin while magnetic
reconnection power is independent of it for the force-free magnetic
configuration with open field lines adopted in our theoretical study. This has
obvious consequences for the time evolution of such systems particularly in the
context of black hole X-ray binary state transitions. Our results provide
analytical justification of the results obtained in GRMHD simulations.
|
[{'version': 'v1', 'created': 'Thu, 12 Jul 2018 10:25:40 GMT'}]
|
2018-07-13
|
[array(['Singh', 'Chandra B.', ''], dtype=object)
array(['Garofalo', 'David', ''], dtype=object)
array(['Pino', 'Elisabete M. de Gouveia Dal', ''], dtype=object)]
|
2,936 |
astro-ph/0110552
|
Tom Theuns
|
Tom Theuns (IoA), Saleem Zaroubi (MPA), Tae-Sun Kim (ESO)
|
Detecting HeliumII reionization from a sudden injection of entropy in
the intergalactic medium
|
4 pages, proceedings XVIIth IAP colloqium, Gaseous matter in galaxies
and intergalactic space
| null | null | null |
astro-ph
| null |
The temperature of the low-density intergalactic medium is set by the balance
between adiabatic cooling resulting from the expansion of the universe, and
photo-heating by the UV-background. A sudden injection of entropy from the
reionization will increase the temperature of the gas, leading to a broadening
of the hydrogen Lyman-alpha absorption lines produced in the IGM, and observed
in the spectra of background quasars. We present a method based on wavelets to
characterise objectively the line widths of such absorption lines. We use high
resolution hydrodynamical simulations to demonstrate that the algorithm can
detect changes in temperature of order of 50 per cent on scales > 5000 km/s. We
apply the method to a UVES/VLT spectrum of quasar 0055--269 (emission
redshift=3.7) and detect at the 99 per cent confidence level a sudden increase
in temperature below redshift z=3.3, which we interpret as evidence for
HeliumII reionization.
|
[{'version': 'v1', 'created': 'Thu, 25 Oct 2001 14:48:23 GMT'}]
|
2007-05-23
|
[array(['Theuns', 'Tom', '', 'IoA'], dtype=object)
array(['Zaroubi', 'Saleem', '', 'MPA'], dtype=object)
array(['Kim', 'Tae-Sun', '', 'ESO'], dtype=object)]
|
2,937 |
1705.11087
|
Neil Ernst
|
Neil A. Ernst and Stephany Bellomo and Ipek Ozkaya and Robert L. Nord
|
What to Fix? Distinguishing between design and non-design rules in
automated tools
|
Long version of accepted short paper at International Conference on
Software Architecture 2017 (Gothenburg, SE)
|
Proceedings of International Conference on Software Architecture,
pp 165-168, 2017
|
10.1109/ICSA.2017.25
| null |
cs.SE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Technical debt---design shortcuts taken to optimize for delivery speed---is a
critical part of long-term software costs. Consequently, automatically
detecting technical debt is a high priority for software practitioners.
Software quality tool vendors have responded to this need by positioning their
tools to detect and manage technical debt. While these tools bundle a number of
rules, it is hard for users to understand which rules identify design issues,
as opposed to syntactic quality. This is important, since previous studies have
revealed the most significant technical debt is related to design issues. Other
research has focused on comparing these tools on open source projects, but
these comparisons have not looked at whether the rules were relevant to design.
We conducted an empirical study using a structured categorization approach, and
manually classify 466 software quality rules from three industry tools---CAST,
SonarQube, and NDepend. We found that most of these rules were easily labeled
as either not design (55%) or design (19%). The remainder (26%) resulted in
disagreements among the labelers. Our results are a first step in formalizing a
definition of a design rule, in order to support automatic detection.
|
[{'version': 'v1', 'created': 'Wed, 31 May 2017 13:35:37 GMT'}]
|
2017-06-01
|
[array(['Ernst', 'Neil A.', ''], dtype=object)
array(['Bellomo', 'Stephany', ''], dtype=object)
array(['Ozkaya', 'Ipek', ''], dtype=object)
array(['Nord', 'Robert L.', ''], dtype=object)]
|
2,938 |
gr-qc/0207101
|
Eric Poisson
|
Eric Poisson
|
A reformulation of the Barrabes-Israel null-shell formalism
|
12 pages, revtex4
| null | null | null |
gr-qc
| null |
We consider a situation in which two metrics are joined at a null
hypersurface. It often occurs that the union of the two metrics gives rise to a
Ricci tensor that contains a term proportional to a Dirac delta-function
supported on the hypersurface. This singularity is associated with a thin
distribution of matter on the hypersurface, and following Barrabes and Israel,
we seek to determine its stress-energy tensor in terms of the geometric
properties of the null hypersurface. While our treatment here does not deviate
strongly from their previous work, it offers a simplification of the
computational operations involved in a typical application of the formalism,
and it gives rise to a stress-energy tensor that possesses a more recognizable
phenomenology. Our reformulation of the null-shell formalism makes systematic
use of the null generators of the singular hypersurface, which define a
preferred flow to which the flow of matter can be compared. This construction
provides the stress-energy tensor with a simple characterization in terms of a
mass density, a mass current, and an isotropic pressure. Our reformulation also
involves a family of freely-moving observers that intersect the surface layer
and perform measurements on it. This construction gives operational meaning to
the stress-energy tensor by fixing the argument of the delta-function to be
proper time as measured by these observers.
|
[{'version': 'v1', 'created': 'Thu, 25 Jul 2002 19:57:58 GMT'}]
|
2007-05-23
|
[array(['Poisson', 'Eric', ''], dtype=object)]
|
2,939 |
cond-mat/0307032
|
Tomasz Wojtowicz
|
T. Wojtowicz, W.L. Lim, X. Liu, G. Cywinski, M. Kutrowski, L.V.
Titova, K. Yee, M. Dobrowolska, J.K. Furdyna, K.M. Yu, W. Walukiewicz, G.B.
Kim, M. Cheon, X. Chen, S.M. Wang, H. Luo, I. Vurgaftman, J.R. Meyer
|
Growth and properties of ferromagnetic In(1-x)Mn(x)Sb alloys
|
Invited talk at 11th International Conference on Narrow Gap
Semiconductors, Buffalo, New York, U.S.A., June 16 - 20, 2003
| null |
10.1016/j.physe.2003.08.028
| null |
cond-mat.mtrl-sci
| null |
We discuss a new narrow-gap ferromagnetic (FM) semiconductor alloy,
In(1-x)Mn(x)Sb, and its growth by low-temperature molecular-beam epitaxy. The
magnetic properties were investigated by direct magnetization measurements,
electrical transport, magnetic circular dichroism, and the magneto-optical Kerr
effect. These data clearly indicate that In(1-x)Mn(x)Sb possesses all the
attributes of a system with carrier-mediated FM interactions, including
well-defined hysteresis loops, a cusp in the temperature dependence of the
resistivity, strong negative magnetoresistance, and a large anomalous Hall
effect. The Curie temperatures in samples investigated thus far range up to 8.5
K, which are consistent with a mean-field-theory simulation of the
carrier-induced ferromagnetism based on the 8-band effective band-orbital
method.
|
[{'version': 'v1', 'created': 'Tue, 1 Jul 2003 21:47:40 GMT'}]
|
2009-11-10
|
[array(['Wojtowicz', 'T.', ''], dtype=object)
array(['Lim', 'W. L.', ''], dtype=object)
array(['Liu', 'X.', ''], dtype=object)
array(['Cywinski', 'G.', ''], dtype=object)
array(['Kutrowski', 'M.', ''], dtype=object)
array(['Titova', 'L. V.', ''], dtype=object)
array(['Yee', 'K.', ''], dtype=object)
array(['Dobrowolska', 'M.', ''], dtype=object)
array(['Furdyna', 'J. K.', ''], dtype=object)
array(['Yu', 'K. M.', ''], dtype=object)
array(['Walukiewicz', 'W.', ''], dtype=object)
array(['Kim', 'G. B.', ''], dtype=object)
array(['Cheon', 'M.', ''], dtype=object)
array(['Chen', 'X.', ''], dtype=object)
array(['Wang', 'S. M.', ''], dtype=object)
array(['Luo', 'H.', ''], dtype=object)
array(['Vurgaftman', 'I.', ''], dtype=object)
array(['Meyer', 'J. R.', ''], dtype=object)]
|
2,940 |
hep-ph/0410204
|
Feng-Kun Guo
|
F.-K. Guo, P.-N. Shen, H.-C. Chiang, R.-G. Ping
|
Heavy Quarkonium \pi^+\pi^- Transitions and a Possible b\bar{b}q\bar{q}
State
|
17 pages, 8 figures; misprints corrected
|
Nucl.Phys.A761:269-282,2005
|
10.1016/j.nuclphysa.2005.07.019
| null |
hep-ph
| null |
$\pi^+\pi^-$ transitions of heavy quarkonia, especially the $
\Upsilon(3S)\to\Upsilon(1S)\pi^+\pi^-$ decay process, are revisited. In the
framework of the Chiral Unitary Theory (ChUT), the $S$ wave $\pi\pi$ final
state interaction (FSI) is included. It is found that when an additional
intermediate state with $J^P=1^+$ and I=1 is introduced, not only the $ \pi\pi$
invariant mass spectrum and the $cos\theta_\pi^*$ distribution in the
$\Upsilon(3S)\to\Upsilon(1S)\pi^+\pi^-$ process can simultaneously be
well-explained, but also a consistent description for other bottomonia $
\pi^+\pi^-$ transitions can be obtained. As a consequence, the mass and the
width of the intermediate state are predicted. From the quark content analysis,
this state should be a $b\bar bq\bar q$ state.
|
[{'version': 'v1', 'created': 'Thu, 14 Oct 2004 13:08:16 GMT'}
{'version': 'v2', 'created': 'Fri, 12 Aug 2005 09:02:21 GMT'}
{'version': 'v3', 'created': 'Fri, 21 Apr 2006 07:22:34 GMT'}]
|
2008-11-26
|
[array(['Guo', 'F. -K.', ''], dtype=object)
array(['Shen', 'P. -N.', ''], dtype=object)
array(['Chiang', 'H. -C.', ''], dtype=object)
array(['Ping', 'R. -G.', ''], dtype=object)]
|
2,941 |
2104.04330
|
Gary R. W. Greaves
|
Gary R.W. Greaves, Jeven Syatriadi, Pavlo Yatsyna
|
Equiangular lines in Euclidean spaces: dimensions 17 and 18
|
39 pages. Contains tables referenced in the journal version. arXiv
admin note: text overlap with arXiv:2002.08085
| null | null | null |
math.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that the maximum cardinality of an equiangular line system in 17
dimensions is 48, thereby solving a longstanding open problem. Furthermore, by
giving an explicit construction, we improve the lower bound on the maximum
cardinality of an equiangular line system in 18 dimensions to 57.
|
[{'version': 'v1', 'created': 'Fri, 9 Apr 2021 12:28:25 GMT'}
{'version': 'v2', 'created': 'Tue, 31 Jan 2023 09:12:56 GMT'}]
|
2023-02-01
|
[array(['Greaves', 'Gary R. W.', ''], dtype=object)
array(['Syatriadi', 'Jeven', ''], dtype=object)
array(['Yatsyna', 'Pavlo', ''], dtype=object)]
|
2,942 |
1608.07197
|
Luca Chiantini
|
Elena Angelini and Cristiano Bocci and Luca Chiantini
|
Real identifiability vs complex identifiability
| null |
Linear and Multilinear Algebra (2017)
|
10.1080/03081087.2017.1347137
| null |
math.AG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Let $T$ be a real tensor of (real) rank $r$. $T$ is 'identifiable' when it
has a unique decomposition in terms of rank $1$ tensors. There are cases in
which the identifiability fails over the complex field, for general tensors of
rank $r$. This behavior is quite peculiar when the rank $r$ is submaximal.
Often, the failure is due to the existence of an elliptic normal curve through
general points of the corresponding Segre, Veronese or Grassmann variety. We
prove the existence of nonempty euclidean open subsets of some variety of
tensors of rank $r$, whose elements have several decompositions over $\mathbb
C$, but only one of them is formed by real summands. Thus, in the open sets,
tensors are not identifiable over $\mathbb C$, but are identifiable over
$\mathbb R$.
We also provide examples of non trivial euclidean open subsets in a whole
space of symmetric tensors (of degree $7$ and $8$ in three variables) and of
almost unbalanced tensors Segre Product ($\mathbb P^2\times \mathbb P^4\times
\mathbb P^9$) whose elements have typical real rank equal to the complex rank,
and are identifiable over $\mathbb R$, but not over $\mathbb C$. On the
contrary, we provide examples of tensors of given real rank, for which real
identifiability cannot hold in non-trivial open subsets.
|
[{'version': 'v1', 'created': 'Thu, 25 Aug 2016 15:34:39 GMT'}
{'version': 'v2', 'created': 'Fri, 16 Sep 2016 11:35:57 GMT'}
{'version': 'v3', 'created': 'Thu, 20 Oct 2016 10:11:10 GMT'}]
|
2018-01-23
|
[array(['Angelini', 'Elena', ''], dtype=object)
array(['Bocci', 'Cristiano', ''], dtype=object)
array(['Chiantini', 'Luca', ''], dtype=object)]
|
2,943 |
2104.01940
|
Einat Minkov
|
Avishai Zagoury and Einat Minkov and Idan Szpektor and William W.
Cohen
|
What's the best place for an AI conference, Vancouver or ______: Why
completing comparative questions is difficult
|
AAAI 2021; preprint
| null | null | null |
cs.CL
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
Although large neural language models (LMs) like BERT can be finetuned to
yield state-of-the-art results on many NLP tasks, it is often unclear what
these models actually learn. Here we study using such LMs to fill in entities
in human-authored comparative questions, like ``Which country is older, India
or ______?'' -- i.e., we study the ability of neural LMs to ask (not answer)
reasonable questions. We show that accuracy in this fill-in-the-blank task is
well-correlated with human judgements of whether a question is reasonable, and
that these models can be trained to achieve nearly human-level performance in
completing comparative questions in three different subdomains. However,
analysis shows that what they learn fails to model any sort of broad notion of
which entities are semantically comparable or similar -- instead the trained
models are very domain-specific, and performance is highly correlated with
co-occurrences between specific entities observed in the training set. This is
true both for models that are pretrained on general text corpora, as well as
models trained on a large corpus of comparison questions. Our study thus
reinforces recent results on the difficulty of making claims about a deep
model's world knowledge or linguistic competence based on performance on
specific benchmark problems. We make our evaluation datasets publicly available
to foster future research on complex understanding and reasoning in such models
at standards of human interaction.
|
[{'version': 'v1', 'created': 'Mon, 5 Apr 2021 14:56:09 GMT'}]
|
2021-04-06
|
[array(['Zagoury', 'Avishai', ''], dtype=object)
array(['Minkov', 'Einat', ''], dtype=object)
array(['Szpektor', 'Idan', ''], dtype=object)
array(['Cohen', 'William W.', ''], dtype=object)]
|
2,944 |
1407.0055
|
Junho Lee
|
Junho Lee
|
A note on Gunningham's formula
|
Typos fixed and exposition changed
| null | null | null |
math.SG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Gunningham [G] constructed an extended topological quantum field theory
(TQFT) to obtain a closed formula for all spin Hurwitz numbers. In this note,
we use the gluing theorem in [LP2] to re-prove the Gunningham's formula. We
also describe a TQFT formalism naturally induced from the gluing theorem.
|
[{'version': 'v1', 'created': 'Mon, 30 Jun 2014 20:55:04 GMT'}
{'version': 'v2', 'created': 'Sun, 8 Jul 2018 03:11:18 GMT'}]
|
2018-07-10
|
[array(['Lee', 'Junho', ''], dtype=object)]
|
2,945 |
2211.11817
|
John Gliksberg
|
John Gliksberg (LI-PaRAD, UCLM), Antoine Capra, Alexandre Louvet,
Pedro Javier Garcia (UCLM), Devan Sohier (LI-PaRAD)
|
High-Quality Fault-Resiliency in Fat-Tree Networks (Extended Abstract)
| null |
2019 IEEE Symposium on High-Performance Interconnects (HOTI), Aug
2019, Santa Clara, United States. pp.9-12
|
10.1109/HOTI.2019.00015
| null |
cs.DC cs.NI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Coupling regular topologies with optimized routing algorithms is key in
pushing the performance of interconnection networks of HPC systems. In this
paper we present Dmodc, a fast deterministic routing algorithm for Parallel
Generalized Fat-Trees (PGFTs) which minimizes congestion risk even under
massive topology degradation caused by equipment failure. It applies a
modulo-based computation of forwarding tables among switches closer to the
destination, using only knowledge of subtrees for pre-modulo division. Dmodc
allows complete rerouting of topologies with tens of thousands of nodes in less
than a second, which greatly helps centralized fabric management react to
faults with high-quality routing tables and no impact to running applications
in current and future very large-scale HPC clusters. We compare Dmodc against
routing algorithms available in the InfiniBand control software (OpenSM) first
for routing execution time to show feasibility at scale, and then for
congestion risk under degradation to demonstrate robustness. The latter
comparison is done using static analysis of routing tables under random
permutation (RP), shift permutation (SP) and all-to-all (A2A) traffic patterns.
Results for Dmodc show A2A and RP congestion risks similar under heavy
degradation as the most stable algorithms compared, and near-optimal SP
congestion risk up to 1% of random degradation.
|
[{'version': 'v1', 'created': 'Mon, 21 Nov 2022 19:29:43 GMT'}]
|
2022-11-23
|
[array(['Gliksberg', 'John', '', 'LI-PaRAD, UCLM'], dtype=object)
array(['Capra', 'Antoine', '', 'UCLM'], dtype=object)
array(['Louvet', 'Alexandre', '', 'UCLM'], dtype=object)
array(['Garcia', 'Pedro Javier', '', 'UCLM'], dtype=object)
array(['Sohier', 'Devan', '', 'LI-PaRAD'], dtype=object)]
|
2,946 |
1204.3897
|
Jeff Wagg F.
|
Jeff Wagg, Alexandra Pope, Stacey Alberts, Lee Armus, Mark Brodwin,
Robert S. Bussmann, Vandana Desai, Arjun Dey, Buell Jannuzi, Emeric Le
Floc'h, Jason Melbourne, and Daniel Stern
|
CO J=2-1 line emission in cluster galaxies at z~1: fueling star
formation in dense environments
|
22 pages, 4 figures; accepted for publication in ApJ
| null |
10.1088/0004-637X/752/2/91
| null |
astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present observations of CO J=2-1 line emission in infrared-luminous
cluster galaxies at z~1 using the IRAM Plateau de Bure Interferometer. Our two
primary targets are optically faint, dust-obscured galaxies (DOGs) found to lie
within 2 Mpc of the centers of two massive (>10^14 Msun) galaxy clusters. CO
line emission is not detected in either DOG. We calculate 3-sigma upper limits
to the CO J=2-1 line luminosities, L'_CO < 6.08x10^9 and < 6.63x10^9 K km/s
pc^2. Assuming a CO-to-H_2 conversion factor derived for ultraluminous infrared
galaxies in the local Universe, this translates to limits on the cold molecular
gas mass of M_H_2 < 4.86x10^9 Msun and M_H_2 < 5.30x10^9 Msun. Both DOGs
exhibit mid-infrared continuum emission that follows a power-law, suggesting
that an AGN contributes to the dust heating. As such, estimates of the star
formation efficiencies in these DOGs are uncertain. A third cluster member with
an infrared luminosity, L_IR < 7.4x10^11 Lsun, is serendipitously detected in
CO J=2-1 line emission in the field of one of the DOGs located roughly two
virial radii away from the cluster center. The optical spectrum of this object
suggests that it is likely an obscured AGN, and the measured CO line luminosity
is L'_CO = (1.94 +/- 0.35)x10^10 K km/s pc^2, which leads to an estimated cold
molecular gas mass M_H_2 = (1.55+/-0.28)x10^10 Msun. A significant reservoir of
molecular gas in a z~1 galaxy located away from the cluster center demonstrates
that the fuel can exist to drive an increase in star-formation and AGN activity
at the outskirts of high-redshift clusters.
|
[{'version': 'v1', 'created': 'Tue, 17 Apr 2012 20:00:03 GMT'}]
|
2015-06-04
|
[array(['Wagg', 'Jeff', ''], dtype=object)
array(['Pope', 'Alexandra', ''], dtype=object)
array(['Alberts', 'Stacey', ''], dtype=object)
array(['Armus', 'Lee', ''], dtype=object)
array(['Brodwin', 'Mark', ''], dtype=object)
array(['Bussmann', 'Robert S.', ''], dtype=object)
array(['Desai', 'Vandana', ''], dtype=object)
array(['Dey', 'Arjun', ''], dtype=object)
array(['Jannuzi', 'Buell', ''], dtype=object)
array(["Floc'h", 'Emeric Le', ''], dtype=object)
array(['Melbourne', 'Jason', ''], dtype=object)
array(['Stern', 'Daniel', ''], dtype=object)]
|
2,947 |
2109.09676
|
Pujian Mao
|
Pujian Mao and Weicheng Zhao
|
Note on the asymptotic structure of Kerr-Schild form
|
v2: refs added, interpretations about several issues improved v3:
refs added, major revision, published in JHEP
|
JHEP 01 (2022) 030
|
10.1007/JHEP01(2022)030
| null |
gr-qc hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
The Kerr-Schild form provides a natural way of realizing the classical double
copy that relates exact solutions in general relativity to exact solutions in
gauge theory. In this paper, we examine the asymptotic structure of Kerr-Schild
form. In Newman-Unti gauge, we find a generic solution space satisfying the
Kerr-Schild form in series expansion around null infinity. The news function in
the solution space is chiral and can not lead to a mass loss formula. A class
of asymptotically flat complex pp-wave solutions in closed form is obtained
from the solution space.
|
[{'version': 'v1', 'created': 'Mon, 20 Sep 2021 16:45:41 GMT'}
{'version': 'v2', 'created': 'Wed, 6 Oct 2021 07:06:58 GMT'}
{'version': 'v3', 'created': 'Tue, 25 Jan 2022 13:33:45 GMT'}]
|
2022-01-26
|
[array(['Mao', 'Pujian', ''], dtype=object)
array(['Zhao', 'Weicheng', ''], dtype=object)]
|
2,948 |
1502.07069
|
Jae Dong Noh
|
Hyun-Myung Chun and Jae Dong Noh
|
Hidden entropy production by fast variables
|
6 pages, 3 figures
|
Phys. Rev. E 91, 052128 (2015)
|
10.1103/PhysRevE.91.052128
| null |
cond-mat.stat-mech
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate nonequilibrium underdamped Langevin dynamics of Brownian
particles that interact through a harmonic potential with coupling constant $K$
and are in thermal contact with two heat baths at different temperatures. The
system is characterized by a net heat flow and an entropy production in the
steady state. We compare the entropy production of the harmonic system with
that of Brownian particles linked with a rigid rod. The harmonic system may be
expected to reduce to the rigid rod system in the infinite $K$ limit. However,
we find that the harmonic system in the $K\to\infty$ limit produces more
entropy than the rigid rod system. The harmonic system has the center of mass
coordinate as a slow variable and the relative coordinate as a fast variable.
By identifying the contributions of the degrees of freedom to the total entropy
production, we show that the hidden entropy production by the fast variable is
responsible for the extra entropy production. We discuss the $K$ dependence of
each contribution.
|
[{'version': 'v1', 'created': 'Wed, 25 Feb 2015 07:14:02 GMT'}]
|
2015-05-26
|
[array(['Chun', 'Hyun-Myung', ''], dtype=object)
array(['Noh', 'Jae Dong', ''], dtype=object)]
|
2,949 |
1606.02852
|
Walter Del Pozzo
|
Walter Del Pozzo and Alberto Vecchio
|
On tests of general relativity with binary radio pulsars
|
Accepted for publication on MNRAS Letters
| null |
10.1093/mnrasl/slw116
| null |
gr-qc astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The timing of radio pulsars in binary systems provides a superb testing
ground of general relativity. Here we propose a Bayesian approach to carry out
these tests, and a relevant efficient numerical implementation, that has
several conceptual and practical advantages with respect to traditional methods
based on least-square-fits that have been used so far: (i) it accounts for the
actual structure of the likelihood function - and it is not predicated on the
Laplace approximation which is implicitly built in least-square fits that can
potentially bias the inference - (ii) it provides the ratio of the evidences of
any two models under consideration as the statistical quantity to compare
different theories, and (iii) it allows us to put joint constraints from the
monitoring of multiple systems, that can be expressed in terms of ratio of
evidences or probability intervals of global (thus not system-dependent)
parameters of the theory, if any exists. Our proposed approach optimally
exploits the progress in timing of radio pulsars and the increase in the number
of observed systems. We demonstrate the power of this framework using simulated
data sets that are representative of current observations.
|
[{'version': 'v1', 'created': 'Thu, 9 Jun 2016 08:04:42 GMT'}]
|
2016-07-27
|
[array(['Del Pozzo', 'Walter', ''], dtype=object)
array(['Vecchio', 'Alberto', ''], dtype=object)]
|
2,950 |
2211.05581
|
Yao Lei Xu
|
Yao Lei Xu, Kriton Konstantinidis, Danilo P. Mandic
|
Graph-Regularized Tensor Regression: A Domain-Aware Framework for
Interpretable Multi-Way Financial Modelling
| null | null | null | null |
q-fin.CP cs.LG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Analytics of financial data is inherently a Big Data paradigm, as such data
are collected over many assets, asset classes, countries, and time periods.
This represents a challenge for modern machine learning models, as the number
of model parameters needed to process such data grows exponentially with the
data dimensions; an effect known as the Curse-of-Dimensionality. Recently,
Tensor Decomposition (TD) techniques have shown promising results in reducing
the computational costs associated with large-dimensional financial models
while achieving comparable performance. However, tensor models are often unable
to incorporate the underlying economic domain knowledge. To this end, we
develop a novel Graph-Regularized Tensor Regression (GRTR) framework, whereby
knowledge about cross-asset relations is incorporated into the model in the
form of a graph Laplacian matrix. This is then used as a regularization tool to
promote an economically meaningful structure within the model parameters. By
virtue of tensor algebra, the proposed framework is shown to be fully
interpretable, both coefficient-wise and dimension-wise. The GRTR model is
validated in a multi-way financial forecasting setting and compared against
competing models, and is shown to achieve improved performance at reduced
computational costs. Detailed visualizations are provided to help the reader
gain an intuitive understanding of the employed tensor operations.
|
[{'version': 'v1', 'created': 'Wed, 26 Oct 2022 13:39:08 GMT'}]
|
2022-11-11
|
[array(['Xu', 'Yao Lei', ''], dtype=object)
array(['Konstantinidis', 'Kriton', ''], dtype=object)
array(['Mandic', 'Danilo P.', ''], dtype=object)]
|
2,951 |
hep-th/9511204
|
Ti-Ming Chiang
|
Ti-ming Chiang, Brian R. Greene, Mark Gross and Yakov Kanter
|
Black Hole Condensation and the Web of Calabi-Yau Manifolds
|
23 pages, 3 postscript figures, uses vanilla.sty, harvmac
|
Nucl.Phys.Proc.Suppl. 46 (1996) 82-95
| null |
CLNS-95/1376
|
hep-th
| null |
We review recent work concerning topology changing phase transitions through
black hole condensation in Type II string theory. We then also briefly describe
a present study aimed at extending the known web of interconnections between
Calabi-Yau manifolds. We show, for instance, that all 7555 Calabi-Yau
hypersurfaces in weighted projective four space are mathematically connected by
extremal transitions.
|
[{'version': 'v1', 'created': 'Wed, 29 Nov 1995 04:10:11 GMT'}]
|
2007-05-23
|
[array(['Chiang', 'Ti-ming', ''], dtype=object)
array(['Greene', 'Brian R.', ''], dtype=object)
array(['Gross', 'Mark', ''], dtype=object)
array(['Kanter', 'Yakov', ''], dtype=object)]
|
2,952 |
1009.1667
|
S Dai
|
Shuxi Dai, Xingtang Zhang, Zuliang Du, Hongxin Dang
|
Fabrication of nanopatterned DNA films by Langmuir-Blodgett technique
|
7 pages, 6 figures
|
Materials Letters, Volume 59, Issue 4, February 2005, Pages
423-429
|
10.1016/j.matlet.2004.09.038
| null |
cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Fractal-like nanopatterned DNA thin films have been fabricated on mica
substrate by Langmuir-Blodgett (LB) technique. Structures and components of DNA
nanopatterns were investigated using atomic force microscopy (AFM) and X-ray
photoelectron spectroscopy (XPS). The effect of surface pressure on the
transferred DNA composite films has been studied. Scanning force microscopic
observations revealed that the surface structure and morphology of DNA
nanopatterns can be well controlled by changing the surface pressure. The
growth mechanism of the fractal-like nanopatterns is discussed in terms of the
diffusion-limited aggregation (DLA) model. The formation of large-scale DNA
networks provided a well-defined template for the construction of nanocomposite
films. Patterns of silver metal were prepared on DNA networks by subsequent
metallization process.
|
[{'version': 'v1', 'created': 'Thu, 9 Sep 2010 01:36:57 GMT'}]
|
2010-09-10
|
[array(['Dai', 'Shuxi', ''], dtype=object)
array(['Zhang', 'Xingtang', ''], dtype=object)
array(['Du', 'Zuliang', ''], dtype=object)
array(['Dang', 'Hongxin', ''], dtype=object)]
|
2,953 |
hep-ph/9807315
| null |
Jogesh C. Pati
|
Implications of the Superkamiokande result on the nature of new physics
|
Based on the talk presented at the Neutrino-98 Conference, Takayama,
Japan, June 4-9, 1998
|
Nucl.Phys.Proc.Suppl. 77 (1999) 299-307
|
10.1016/S0920-5632(99)00432-6
|
UMD-PP-99-01
|
hep-ph
| null |
It is remarked that the SuperKamiokande (SK) discovery of $\nu_\mu$ to
$\nu_\tau$ (or $\nu_X$)-oscillation, with a $\delta m^2 \approx 10^{-2}-10^{-3}
eV^2$ and $sin^2 2 \theta > 0.8$, provides a clear need for the right-handed
(RH) neutrinos. This in turn reinforces the ideas of the left-right symmetric
gauge structure $SU(2)_L \times SU(2)_R$ as well as SU(4)-color, for which the
RH neutrinos are a compelling feature. It is noted that by assuming (a) that
B-L and $I_{3R}$, contained in a string-derived $G(224) = SU(2)_L \times
SU(2)_R \times SU(4)^c$ or SO(10), break near the GUT-scale, as opposed to an
intermediate scale, (b) the see-saw mechanism, and (c) the SU(4)-color relation
between the Dirac mass of the tau neutrino and $m_{top}$, one obtains a mass
for $\nu^\tau_L$ which is just about what is observed. This is assuming that
the SK group is actually seeing $\nu^\mu_L - \nu^\tau_L$ (rather than
$\nu_L^\mu - \nu_X$) oscillation. Following a very recent work by Babu, Wilczek
and myself, it is furthermore noted that one can quite plausibly obtain a large
$\nu_L^\mu-\nu_L^\tau$ oscillation angle, as observed, in spite of highly
non-degenerate masses of the light neutrinos: e.g. with
$m(\nu_L^\mu)/m(\nu_L^\tau)\approx 1/10-1/20$. Such non-degeneracy is of course
natural to see-saw. In this case, $\nu^e_L - \nu^\mu_L$ oscillation can be
relevant to the small angle MSW explanation of the solar neutrino puzzle.
Implications of the mass of $\nu^\tau_L$ suggested by the SK result, on proton
decay are noted. Comments are made at the end on how the SuperKamiokande result
supplements the LEP result in selecting out the route to higher unification.
|
[{'version': 'v1', 'created': 'Thu, 9 Jul 1998 19:18:40 GMT'}]
|
2009-10-31
|
[array(['Pati', 'Jogesh C.', ''], dtype=object)]
|
2,954 |
0902.1641
|
Peter D. Ditlevsen
|
Peter D. Ditlevsen
|
The bifurcation structure and noise induced transitions in the
Pleistocene glacial cycles
|
30 pages, 6 figures, submitted to Paleoceanography
| null | null | null |
nlin.CD physics.ao-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The glacial cycles are attributed to the climatic response of the orbital
changes in the irradiance to the Earth. These changes in the forcing are to
small to explain the observed climate variations as simple linear responses.
Non-linear amplifications are necessary to account for the glacial cycles. Here
an empirical model of the non-linear response is presented. From the model it
is possible to assess the role of stochastic noise in comparison to the
deterministic orbital forcing of the ice ages. The model is based on the
bifurcation structure derived from the climate history. It indicates the
dynamical origin of the Mid-Pleistocene transition (MPT) from the '41 kyr
world' to the '100 kyr world'. The dominant forcing in the latter is still the
41 kyr obliquity cycle, but the bifurcation structure of the climate system is
changed. The model indicates that transitions between glacial and interglacial
climate are assisted by internal stochastic noise in the period prior to the
last five glacial cycles, while the last five cycles are deterministic
responses to the orbital forcing.
|
[{'version': 'v1', 'created': 'Tue, 10 Feb 2009 12:43:49 GMT'}]
|
2009-02-11
|
[array(['Ditlevsen', 'Peter D.', ''], dtype=object)]
|
2,955 |
1712.02536
|
Florian Goertz
|
Adri\'an Carmona and Florian Goertz
|
Recent $\boldsymbol{B}$ Physics Anomalies - a First Hint for
Compositeness?
|
21 pages, 6 figures
| null |
10.1140/epjc/s10052-018-6437-1
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We scrutinize the recently further strengthened hints for new physics in
semileptonic $B$-meson decays, focusing on the 'clean' ratios of branching
fractions $R_K$ and $R_{K^\ast}$ and examining to which pattern of new effects
they point to. We explore in particular the hardly considered, yet fully
viable, option of new physics in the right-handed electron sector and
demonstrate how a recently proposed framework of leptons in composite Higgs
setups naturally solves both the $R_K$ and $R_{K^\ast}$ anomalies via a
peculiar structure of new physics effects, predicted by minimality of the model
and the scale of neutrino masses. Finally, we also take into account further
observables, such as ${\cal B}(B_s \to \mu^+\mu^-)$, $\Delta M_{B_s}$, and
angular observables in $B \to K^{\ast} \mu^+ \mu^-$ decays, to arrive at a
comprehensive picture of the model concerning (semileptonic) $B$ decays. We
conclude that -- since it is in good agreement with the experimental situation
in flavor physics and also allows to avoid ultra-light top partners -- the
model furnishes a very promising scenarios of Higgs compositeness in the light
of LHC data.
|
[{'version': 'v1', 'created': 'Thu, 7 Dec 2017 08:34:02 GMT'}]
|
2018-12-05
|
[array(['Carmona', 'Adrián', ''], dtype=object)
array(['Goertz', 'Florian', ''], dtype=object)]
|
2,956 |
cond-mat/0005387
|
Eugene V. Bezuglyi
|
E. V. Bezuglyi, E. N. Bratus', V. S. Shumeiko, G. Wendin, and H.
Takayanagi
|
Circuit theory of multiple Andreev reflections in diffusive SNS
junctions: the incoherent case
|
14 pages, 9 figures, title and text revised, to appear in PRB
|
Phys. Rev. B 63,14439 (2000)
|
10.1103/PhysRevB.62.14439
| null |
cond-mat.supr-con
| null |
The incoherent regime of Multiple Andreev Reflections (MAR) is studied in
long diffusive SNS junctions at applied voltages larger than the Thouless
energy. Incoherent MAR is treated as a transport problem in energy space by
means of a circuit theory for an equivalent electrical network. The current
through NS interfaces is explained in terms of diffusion flows of electrons and
holes through tunnel and Andreev resistors. These resistors in diffusive
junctions play roles analogous to the normal and Andreev reflection
coefficients in OTBK theory for ballistic junctions. The theory is applied to
the subharmonic gap structure (SGS); simple analytical results are obtained for
the distribution function and current spectral density for the limiting cases
of resistive and transparent NS interfaces. In the general case, the exact
solution is found in terms of chain-fractions, and the current is calculated
numerically. SGS shows qualitatively different behavior for even and odd
subharmonic numbers, and the maximum slopes of the differential resistance
correspond to the gap subharmonics. The influence of inelastic scattering on
the subgap anomalies of the differential resistance is analyzed.
|
[{'version': 'v1', 'created': 'Tue, 23 May 2000 18:13:30 GMT'}
{'version': 'v2', 'created': 'Thu, 17 Aug 2000 10:45:24 GMT'}]
|
2014-02-10
|
[array(['Bezuglyi', 'E. V.', ''], dtype=object)
array(["Bratus'", 'E. N.', ''], dtype=object)
array(['Shumeiko', 'V. S.', ''], dtype=object)
array(['Wendin', 'G.', ''], dtype=object)
array(['Takayanagi', 'H.', ''], dtype=object)]
|
2,957 |
1911.01981
|
Cesar Esteban
|
C. Esteban, F. Bresolin, J. Garc\'ia-Rojas, L. Toribio San Cipriano
|
Carbon, nitrogen and oxygen abundance gradients in M101 and M31
|
20 pages, 17 figures, accepted for publication in Monthly Notices of
the Royal Astronomical Society
| null |
10.1093/mnras/stz3134
| null |
astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present deep spectrophotometry of 18 HII regions in the nearby massive
spiral galaxies M101 and M31. We have obtained direct determinations of
electron temperature in all the nebulae. We detect the CII 4267 line in several
HII regions, permitting to derive the radial gradient of C/H in both galaxies.
We also determine the radial gradients of O/H, N/O, Ne/O, S/O, Cl/O and Ar/O
ratios. As in other spiral galaxies, the C/H gradients are steeper than those
of O/H producing negative slopes of the C/O gradient. The scatter of the
abundances of O with respect to the gradient fittings do not support the
presence of significant chemical inhomogeneities across the discs of the
galaxies, especially in the case of M101. We find trends in the S/O, Cl/O and
Ar/O ratios as a function of O/H in M101 that can be reduced using Te
indicators different from the standard ones for calculating some ionic
abundances. The distribution of the N/O ratio with respect to O/H is rather
flat in M31, similarly to previous findings for the MilkyWay. Using the disc
effective radius, Re, as a normalization parameter for comparing gradients, we
find that the latest estimates of Re for the Milky Way provide an excess of
metallicity in apparent contradiction with the mass-metallicity relation; a
value about two times larger might solve the problem. Finally, using different
abundance ratios diagrams we find that the enrichment timescales of C and N
result to be fairly similar despite their different nucleosynthetic origin.
|
[{'version': 'v1', 'created': 'Tue, 5 Nov 2019 18:17:20 GMT'}]
|
2019-12-18
|
[array(['Esteban', 'C.', ''], dtype=object)
array(['Bresolin', 'F.', ''], dtype=object)
array(['García-Rojas', 'J.', ''], dtype=object)
array(['Cipriano', 'L. Toribio San', ''], dtype=object)]
|
2,958 |
1706.03931
|
Ari Arapostathis
|
Ari Arapostathis, Guodong Pang
|
Infinite horizon asymptotic average optimality for large-scale parallel
server networks
|
35 pages. arXiv admin note: text overlap with arXiv:1602.03275
|
Stochastic Processes and Their Applications 129 (2019), no. 1,
283-322
|
10.1016/j.spa.2018.03.005
| null |
math.OC cs.SY
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study infinite-horizon asymptotic average optimality for parallel server
network with multiple classes of jobs and multiple server pools in the
Halfin-Whitt regime. Three control formulations are considered: 1) minimizing
the queueing and idleness cost, 2) minimizing the queueing cost under a
constraints on idleness at each server pool, and 3) fairly allocating the idle
servers among different server pools. For the third problem, we consider a
class of bounded-queue, bounded-state (BQBS) stable networks, in which any
moment of the state is bounded by that of the queue only (for both the limiting
diffusion and diffusion-scaled state processes). We show that the optimal
values for the diffusion-scaled state processes converge to the corresponding
values of the ergodic control problems for the limiting diffusion. We present a
family of state-dependent Markov balanced saturation policies (BSPs) that
stabilize the controlled diffusion-scaled state processes. It is shown that
under these policies, the diffusion-scaled state process is exponentially
ergodic, provided that at least one class of jobs has a positive abandonment
rate. We also establish useful moment bounds, and study the ergodic properties
of the diffusion-scaled state processes, which play a crucial role in proving
the asymptotic optimality.
|
[{'version': 'v1', 'created': 'Tue, 13 Jun 2017 07:29:56 GMT'}
{'version': 'v2', 'created': 'Mon, 26 Jun 2017 08:22:46 GMT'}
{'version': 'v3', 'created': 'Tue, 23 Jan 2018 04:35:53 GMT'}]
|
2019-03-20
|
[array(['Arapostathis', 'Ari', ''], dtype=object)
array(['Pang', 'Guodong', ''], dtype=object)]
|
2,959 |
1108.5269
|
Jianhong Shi
|
Jie Wang, Jianhong Shi, Linghao Tian, Xianfeng Chen
|
Tuning Optical Orbital Angular Momentum in Optical Superlattice under
Electro-optic Effect
| null | null | null | null |
physics.optics
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce a new method to generate and tune the optical orbital angular
momentum of a focused Gaussian beam passing through the optical superlattice
under the electro-optic effect. The orbital angular momentum (OAM) arises from
the curl of polarization in our calculation. We see that adjusting the external
electric field, the beam waist radius and the crystal length provides dramatic
variation of OAM of light across the transverse section. It is believed that
this invention will find its application in optical manipulation area.
|
[{'version': 'v1', 'created': 'Fri, 26 Aug 2011 09:31:46 GMT'}]
|
2011-08-29
|
[array(['Wang', 'Jie', ''], dtype=object)
array(['Shi', 'Jianhong', ''], dtype=object)
array(['Tian', 'Linghao', ''], dtype=object)
array(['Chen', 'Xianfeng', ''], dtype=object)]
|
2,960 |
1808.07678
|
Wajdi Zaghouani
|
Wajdi Zaghouani and Anis Charfi
|
Guidelines and Annotation Framework for Arabic Author Profiling
|
Proceedings of the Eleventh International Conference on Language
Resources and Evaluation (LREC 2018), The 3rd Workshop on Open-Source Arabic
Corpora and Processing Tools: with ArabicWeb16 Data Challenge. arXiv admin
note: text overlap with arXiv:1808.07674
| null | null | null |
cs.CL
|
http://creativecommons.org/licenses/by/4.0/
|
In this paper, we present the annotation pipeline and the guidelines we wrote
as part of an effort to create a large manually annotated Arabic author
profiling dataset from various social media sources covering 16 Arabic
countries and 11 dialectal regions. The target size of the annotated ARAP-Tweet
corpus is more than 2.4 million words. We illustrate and summarize our general
and dialect-specific guidelines for each of the dialectal regions selected. We
also present the annotation framework and logistics. We control the annotation
quality frequently by computing the inter-annotator agreement during the
annotation process. Finally, we describe the issues encountered during the
annotation phase, especially those related to the peculiarities of Arabic
dialectal varieties as used in social media.
|
[{'version': 'v1', 'created': 'Thu, 23 Aug 2018 09:52:26 GMT'}]
|
2018-08-24
|
[array(['Zaghouani', 'Wajdi', ''], dtype=object)
array(['Charfi', 'Anis', ''], dtype=object)]
|
2,961 |
2305.11007
|
Sk Md Adil Imam
|
Sk Md Adil Imam, Arunava Mukherjee, B. K. Agrawal, Gourab Banerjee
|
Direct mapping of tidal deformability to the iso-scalar and iso-vector
nuclear matter parameters
|
5 pages, 5 figures
| null | null | null |
nucl-th astro-ph.HE gr-qc
|
http://creativecommons.org/licenses/by/4.0/
|
Background: The equations of state (EoSs) which determine the properties of
neutron stars (NSs) are often characterized by the iso-scalar and iso-vector
nuclear matter parameters (NMPs). Recent attempts to relate the radius and
tidal deformability of a NS to the individual NMPs have been inconclusive.
These properties display strong correlations with the pressure of NS matter
which depends on several NMPs. The knowledge of minimal NMPs that determine the
NS properties will be necessary to address any connection between NS properties
(e.g., tidal deformability) and that of finite nuclei.
Purpose: To identify the important NMPs required to describe the tidal
deformability of neutron star for astrophysically relevant range of their
gravitational masses (1.2 -- 1.8 M$_\odot$) as encountered in the binary
neutron star merger events.
Method: We construct a large set of EoSs using four iso-scalar and five
iso-vector NMPs. These EOSs are employed to perform a systematic analysis to
isolate the NMPs that predominantly determine the tidal deformability, over a
wide range of NS mass. The tidal deformability is then directly mapped to these
NMPs.
Results: The tidal deformability of the NS with mass 1.2-1.8 M$_\odot$ can be
determined within 10$\%$ directly in terms of four nuclear matter parameters,
namely, the incompressibility $K_0$ and skewness $Q_0$ of symmetric nuclear
matter, and the slope $L_0$ and curvature parameter $K_{\rm sym,0}$ of symmetry
energy.
Conclusion: A function that quickly estimates the value of tidal
deformability in terms of minimal nuclear matter parameters is developed. Our
method can also be extended to other NS observables.
|
[{'version': 'v1', 'created': 'Thu, 18 May 2023 14:36:57 GMT'}
{'version': 'v2', 'created': 'Fri, 19 May 2023 10:27:11 GMT'}]
|
2023-05-22
|
[array(['Imam', 'Sk Md Adil', ''], dtype=object)
array(['Mukherjee', 'Arunava', ''], dtype=object)
array(['Agrawal', 'B. K.', ''], dtype=object)
array(['Banerjee', 'Gourab', ''], dtype=object)]
|
2,962 |
1609.07977
|
Steffen Lange
|
Steffen Lange (1), Arnd B\"acker (1,2), Roland Ketzmerick (1,2) ((1)
Institut f\"ur Theoretische Physik and Center for Dynamics, Technische
Universit\"at Dresden (2) Max-Planck-Institut f\"ur Physik komplexer Systeme)
|
What is the mechanism of power-law distributed Poincar\'e recurrences in
higher-dimensional systems?
|
4 pages, 3 figures
|
EPL, 116 (2016) 30002
|
10.1209/0295-5075/116/30002
| null |
nlin.CD math.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The statistics of Poincar\'e recurrence times in Hamiltonian systems
typically shows a power-law decay with chaotic trajectories sticking to some
phase-space regions for long times. For higher-dimensional systems the
mechanism of this power-law trapping is still unknown. We investigate trapped
orbits of a generic 4D symplectic map in phase space and frequency space and
find that, in contrast to 2D maps, the trapping is (i) not due to a hierarchy
in phase space. Instead, it occurs at the surface of the regular region, (ii)
outside of the Arnold web. The chaotic dynamics in this sticky region is (iii)
dominated by resonance channels which reach far into the chaotic region: We
observe (iii.a) clear signatures of some kind of partial transport barriers and
conjecture (iii.b) a stochastic process with an effective drift along resonance
channels. These two processes lay the basis for a future understanding of the
mechanism of power-law trapping in higher-dimensional systems.
|
[{'version': 'v1', 'created': 'Mon, 26 Sep 2016 14:14:35 GMT'}]
|
2016-12-13
|
[array(['Lange', 'Steffen', ''], dtype=object)
array(['Bäcker', 'Arnd', ''], dtype=object)
array(['Ketzmerick', 'Roland', ''], dtype=object)]
|
2,963 |
1804.01987
|
Rahul Kannan
|
Rahul Kannan (Harvard/CfA), Mark Vogelsberger (MIT), Federico
Marinacci (MIT), Ryan McKinnon (MIT), R\"udiger Pakmor (HITS) and Volker
Springel (HITS)
|
AREPO-RT: Radiation hydrodynamics on a moving mesh
|
v2, accepted for publication in MNRAS, changed to a Strang split
scheme to achieve second order convergence
| null |
10.1093/mnras/stz287
| null |
astro-ph.IM astro-ph.CO astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce AREPO-RT, a novel radiation hydrodynamic (RHD) solver for the
unstructured moving-mesh code AREPO. Our method solves the moment-based
radiative transfer equations using the M1 closure relation. We achieve second
order convergence by using a slope limited linear spatial extrapolation and a
first order time prediction step to obtain the values of the primitive
variables on both sides of the cell interface. A Harten-Lax-Van Leer flux
function, suitably modified for moving meshes, is then used to solve the
Riemann problem at the interface. The implementation is fully conservative and
compatible with the individual timestepping scheme of AREPO. It incorporates
atomic Hydrogen (H) and Helium (He) thermochemistry, which is used to couple
the ultra-violet (UV) radiation field to the gas. Additionally, infrared
radiation is coupled to the gas under the assumption of local thermodynamic
equilibrium between the gas and the dust. We successfully apply our code to a
large number of test problems, including applications such as the expansion of
${\rm H_{II}}$ regions, radiation pressure driven outflows and the levitation
of optically thick layer of gas by trapped IR radiation. The new implementation
is suitable for studying various important astrophysical phenomena, such as the
effect of radiative feedback in driving galactic scale outflows, radiation
driven dusty winds in high redshift quasars, or simulating the reionisation
history of the Universe in a self consistent manner.
|
[{'version': 'v1', 'created': 'Thu, 5 Apr 2018 18:00:00 GMT'}
{'version': 'v2', 'created': 'Fri, 1 Feb 2019 16:00:44 GMT'}]
|
2019-02-13
|
[array(['Kannan', 'Rahul', '', 'Harvard/CfA'], dtype=object)
array(['Vogelsberger', 'Mark', '', 'MIT'], dtype=object)
array(['Marinacci', 'Federico', '', 'MIT'], dtype=object)
array(['McKinnon', 'Ryan', '', 'MIT'], dtype=object)
array(['Pakmor', 'Rüdiger', '', 'HITS'], dtype=object)
array(['Springel', 'Volker', '', 'HITS'], dtype=object)]
|
2,964 |
hep-th/0305177
|
Neil Constable
|
Neil R. Constable and Finn Larsen
|
The Rolling Tachyon as a Matrix Model
|
22pages. 3 figures. v2: added reference, fixed minor typos
|
JHEP 0306 (2003) 017
|
10.1088/1126-6708/2003/06/017
| null |
hep-th
| null |
We express all correlation functions in timelike boundary Liouville theory as
unitary matrix integrals and develop efficient techniques to evaluate these
integrals. We compute large classes of correlation functions explicitly,
including an infinite number of terms in the boundary state of the rolling
tachyon. The matrix integrals arising here also determine the correlation
functions of gauge invariant operators in two dimensional Yang-Mills theory,
suggesting an equivalence between the rolling tachyon and QCD_2.
|
[{'version': 'v1', 'created': 'Tue, 20 May 2003 17:32:00 GMT'}
{'version': 'v2', 'created': 'Fri, 13 Jun 2003 19:36:42 GMT'}]
|
2009-11-10
|
[array(['Constable', 'Neil R.', ''], dtype=object)
array(['Larsen', 'Finn', ''], dtype=object)]
|
2,965 |
1609.02220
|
Benjamin Albert
|
Benjamin I. Albert
|
Heat Kernel Renormalization on Manifolds with Boundary
|
48 pages
| null | null | null |
math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the monograph Renormalization and Effective Field Theory, Costello made
two major advances towards the mathematical formulation of quantum field
theory. Firstly, he developed an inductive position space renormalization
procedure for constructing effective field theories that is based on heat
kernel regularization of the propagator. Secondly, he gave a rigorous
formulation of quantum gauge theory within effective field theory that makes
use of the BV formalism. In this work, we extend Costello's inductive
renormalization procedure from manifolds without boundary to a class of
manifolds with boundary. In addition, we reorganize the presentation of the
preexisting material, filling in details and strengthening the results.
|
[{'version': 'v1', 'created': 'Wed, 7 Sep 2016 23:31:19 GMT'}
{'version': 'v2', 'created': 'Wed, 8 Nov 2017 02:53:05 GMT'}
{'version': 'v3', 'created': 'Sun, 29 Mar 2020 00:17:47 GMT'}]
|
2020-03-31
|
[array(['Albert', 'Benjamin I.', ''], dtype=object)]
|
2,966 |
1411.0467
|
Jianbo Wang
|
Jianbo Wang
|
Moduli spaces of 6 and 7-dimensional complete intersections
|
6 pages
| null | null | null |
math.AT math.AG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper proves the existence of homeomorphic (diffeomorphic) complex
6-dimensional (7-dim) complete intersections that belong to components of the
moduli space of different dimensions. These results are given as a supplement
to earlier result on 5-dimensional complete intersections.
|
[{'version': 'v1', 'created': 'Mon, 3 Nov 2014 12:54:21 GMT'}]
|
2014-11-04
|
[array(['Wang', 'Jianbo', ''], dtype=object)]
|
2,967 |
1901.00375
|
Laurent Decreusefond
|
Ana\"is Vergne (LTCI), Laurent Decreusefond (LTCI), Philippe Martins
(LTCI)
|
Computing the $k$-coverage of a wireless network
|
Valuetools 2019, Mar 2019, Palma de Mallorca, Spain. 2019. arXiv
admin note: text overlap with arXiv:1802.08442
| null | null | null |
cs.NI cs.PF
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Coverage is one of the main quality of service of a wirelessnetwork.
$k$-coverage, that is to be covered simultaneously by $k$network nodes, is
synonym of reliability and numerous applicationssuch as multiple site MIMO
features, or handovers. We introduce here anew algorithm for computing the
$k$-coverage of a wirelessnetwork. Our method is based on the observation that
$k$-coverage canbe interpreted as $k$ layers of $1$-coverage, or simply
coverage. Weuse simplicial homology to compute the network's topology and
areduction algorithm to indentify the layers of $1$-coverage. Weprovide figures
and simulation results to illustrate our algorithm.
|
[{'version': 'v1', 'created': 'Sat, 29 Dec 2018 17:52:53 GMT'}]
|
2019-01-03
|
[array(['Vergne', 'Anaïs', '', 'LTCI'], dtype=object)
array(['Decreusefond', 'Laurent', '', 'LTCI'], dtype=object)
array(['Martins', 'Philippe', '', 'LTCI'], dtype=object)]
|
2,968 |
1701.02131
|
Pham Tuan-Anh
|
P. T. Nhung, D. T. Hoai, P. Tuan-Anh, P. N. Diep, N. T. Phuong, N. T.
Thao, P. Darriulat
|
High resolution ALMA observation of the $^{12}$CO(3-2) and 350 GHz
continuum emissions of the debris disc of 49 Ceti
|
15 pages, 11 figures, accepted for publication in MNRAS
| null |
10.1093/mnras/stx1125
| null |
astro-ph.SR astro-ph.EP astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present high resolution ALMA observations of the CO(3-2) and 350 GHz
continuum emissions of the debris disc of 49 Ceti, known to be particularly
rich in molecular gas in spite of its age. The main new results are: i) both CO
and dust discs share a same position angle and a same inclination but the gas
disc is more homogeneous, more central and thinner than the dust disc; ii)
evidence is obtained for a significant deficit of observed CO(3-2) emission at
Doppler velocities differing from the star systemic velocity by less than 1
\kms; iii) gas velocities are accurately measured and found Keplerian over a
broad range of disc radii; iv) the observed CO(3-2) line width is dominated by
Keplerian shear and upper limits are obtained to the intrinsic line width.
Simple phenomenological models of both CO(3-2) and \mbox{350 GHz} continuum
emissions are presented, requiring the use of only very few parameters. The
results are discussed in the frame of currently favoured models.
|
[{'version': 'v1', 'created': 'Mon, 9 Jan 2017 11:04:18 GMT'}
{'version': 'v2', 'created': 'Thu, 8 Jun 2017 10:54:45 GMT'}]
|
2017-06-28
|
[array(['Nhung', 'P. T.', ''], dtype=object)
array(['Hoai', 'D. T.', ''], dtype=object)
array(['Tuan-Anh', 'P.', ''], dtype=object)
array(['Diep', 'P. N.', ''], dtype=object)
array(['Phuong', 'N. T.', ''], dtype=object)
array(['Thao', 'N. T.', ''], dtype=object)
array(['Darriulat', 'P.', ''], dtype=object)]
|
2,969 |
1308.1177
|
Toan Nguyen
|
Toan T. Nguyen, Walter A. Strauss
|
Linear Stability Analysis of a Hot Plasma in a Solid Torus
|
51 pages, 1 figure. ARMA, accepted
| null |
10.1007/s00205-013-0680-2
| null |
math.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper is a first step toward understanding the effect of toroidal
geometry on the rigorous stability theory of plasmas. We consider a
collisionless plasma inside a torus, modeled by the relativistic Vlasov-Maxwell
system. The surface of the torus is perfectly conducting and it reflects the
particles specularly. We provide sharp criteria for the stability of equilibria
under the assumption that the particle distributions and the electromagnetic
fields depend only on the cross-sectional variables of the torus.
|
[{'version': 'v1', 'created': 'Tue, 6 Aug 2013 03:46:42 GMT'}]
|
2015-06-16
|
[array(['Nguyen', 'Toan T.', ''], dtype=object)
array(['Strauss', 'Walter A.', ''], dtype=object)]
|
2,970 |
2008.03210
|
Abhishek Kulkarni
|
Abhishek N. Kulkarni and Jie Fu
|
A Theory of Hypergames on Graphs for Synthesizing Dynamic Cyber Defense
with Deception
|
32 pages, 10 figures, 2 tables, Accepted Book Chapter in "Game Theory
and Machine Learning for Cyber Security" by Wiley-IEEE press, Editors:
Charles A. Kamhoua, Christopher D. Kiekintveld, Fei Fang, Quanyan Zhu
| null | null | null |
cs.CR cs.AI cs.GT cs.LO cs.NI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this chapter, we present an approach using formal methods to synthesize
reactive defense strategy in a cyber network, equipped with a set of decoy
systems. We first generalize formal graphical security models--attack
graphs--to incorporate defender's countermeasures in a game-theoretic model,
called an attack-defend game on graph. This game captures the dynamic
interactions between the defender and the attacker and their defense/attack
objectives in formal logic. Then, we introduce a class of hypergames to model
asymmetric information created by decoys in the attacker-defender interactions.
Given qualitative security specifications in formal logic, we show that the
solution concepts from hypergames and reactive synthesis in formal methods can
be extended to synthesize effective dynamic defense strategy using cyber
deception. The strategy takes the advantages of the misperception of the
attacker to ensure security specification is satisfied, which may not be
satisfiable when the information is symmetric.
|
[{'version': 'v1', 'created': 'Fri, 7 Aug 2020 14:59:28 GMT'}]
|
2020-08-10
|
[array(['Kulkarni', 'Abhishek N.', ''], dtype=object)
array(['Fu', 'Jie', ''], dtype=object)]
|
2,971 |
1805.03191
|
Onur Alper
|
Onur Alper
|
On the singular set of free interface in an optimal partition problem
|
50 pages
| null | null | null |
math.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the singular set of free interface in an optimal partition problem
for the Dirichlet eigenvalues. We prove that its upper $(n-2)$-dimensional
Minkowski content, and consequently, its $(n-2)$-dimensional Hausdorff measure
are locally finite. We also show that the singular set is countably
$(n-2)$-rectifiable, namely it can be covered by countably many $C^1$-manifolds
of dimension $(n-2)$, up to a set of $(n-2)$-dimensional Hausdorff measure
zero. Our results hold for optimal partitions on Riemannian manifolds and
harmonic maps into homogeneous trees as well.
|
[{'version': 'v1', 'created': 'Tue, 8 May 2018 17:49:00 GMT'}]
|
2018-05-09
|
[array(['Alper', 'Onur', ''], dtype=object)]
|
2,972 |
2101.09196
|
Giorgi Tutberidze
|
G. Tutberidze
|
Sharp $\left( H_{p},L_{p}\right) $ type inequalities of maximal
operators of $T$ means with respect to Vilenkin systems with monotone
coefficients
|
arXiv admin note: substantial text overlap with arXiv:1504.05974,
arXiv:1803.00627 by other authors
| null | null | null |
math.CA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we prove and discuss some new $\left( H_{p},L_{p}\right)$ type
inequalities of maximal operators of $T$ means with respect to the Vilenkin
systems with monotone coefficients. We also apply these inequalities to prove
strong convergence theorems of such $T$ means. We also show that these results
are the best possible in a special sense. As applications, both some well-known
and new results are pointed out.
|
[{'version': 'v1', 'created': 'Wed, 20 Jan 2021 09:13:46 GMT'}]
|
2021-01-25
|
[array(['Tutberidze', 'G.', ''], dtype=object)]
|
2,973 |
1012.2321
|
Matteo Pradella
|
Violetta Lonati and Dino Mandrioli and Matteo Pradella
|
Precedence Automata and Languages
|
Extended version of the paper which appeared in Proceedings of CSR
2011, Lecture Notes in Computer Science, vol. 6651, pp. 291-304, 2011.
Theorem 1 has been corrected and a complete proof is given in Appendix
| null | null | null |
cs.FL
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Operator precedence grammars define a classical Boolean and deterministic
context-free family (called Floyd languages or FLs). FLs have been shown to
strictly include the well-known visibly pushdown languages, and enjoy the same
nice closure properties. We introduce here Floyd automata, an equivalent
operational formalism for defining FLs. This also permits to extend the class
to deal with infinite strings to perform for instance model checking.
|
[{'version': 'v1', 'created': 'Fri, 10 Dec 2010 17:01:34 GMT'}
{'version': 'v2', 'created': 'Wed, 30 Nov 2011 12:04:23 GMT'}]
|
2011-12-01
|
[array(['Lonati', 'Violetta', ''], dtype=object)
array(['Mandrioli', 'Dino', ''], dtype=object)
array(['Pradella', 'Matteo', ''], dtype=object)]
|
2,974 |
2206.10846
|
Muhammad Majid Dr
|
Muhammad Majid, Aamir Arsalan, Syed Muhammad Anwar
|
A Multimodal Perceived Stress Classification Framework using Wearable
Physiological Sensors
|
Submitted in IEEE TRANSACTIONS ON COGNITIVE AND DEVELOPMENTAL SYSTEMS
| null | null | null |
eess.SY cs.SY
|
http://creativecommons.org/licenses/by/4.0/
|
Mental stress is a largely prevalent condition known to affect many people
and could be a serious health concern. The quality of human life can be
significantly improved if mental health is properly managed. Towards this, we
propose a robust method for perceived stress classification, which is based on
using multimodal data, acquired from forty subjects, including three
(electroencephalography (EEG), galvanic skin response (GSR), and
photoplethysmography (PPG)) physiological modalities. The data is acquired for
three minutes duration in an open eyes condition. A perceived stress scale
(PSS) questionnaire is used to record the stress of participants, which is then
used to assign stress labels (two- and three classes). Time (four from GSR and
PPG signals) and frequency (four from EEG signal) domain features are
extracted. Among EEG based features, using a frequency band selection algorithm
for selecting the optimum EEG frequency subband, the theta band was selected.
Further, a wrapper-based method is used for optimal feature selection. Human
stress level classification is performed using three different classifiers,
which are fed with a fusion of the selected set of features from three
modalities. A significant accuracy (95% for two classes, and 77.5% for three
classes) was achieved using the multilayer perceptron classifier.
|
[{'version': 'v1', 'created': 'Wed, 22 Jun 2022 05:13:55 GMT'}]
|
2022-06-23
|
[array(['Majid', 'Muhammad', ''], dtype=object)
array(['Arsalan', 'Aamir', ''], dtype=object)
array(['Anwar', 'Syed Muhammad', ''], dtype=object)]
|
2,975 |
1010.1112
|
Leonid Barenboim
|
Leonid Barenboim, Shlomi Dolev, and Rafail Ostrovsky
|
Deterministic and Energy-Optimal Wireless Synchronization
| null | null | null | null |
cs.DC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the problem of clock synchronization in a wireless setting where
processors must power-down their radios in order to save energy. Energy
efficiency is a central goal in wireless networks, especially if energy
resources are severely limited. In the current setting, the problem is to
synchronize clocks of $m$ processors that wake up in arbitrary time points,
such that the maximum difference between wake up times is bounded by a positive
integer $n$, where time intervals are appropriately discretized. Currently, the
best-known results for synchronization for single-hop networks of $m$
processors is a randomized algorithm due to \cite{BKO09} of O(\sqrt {n /m}
\cdot poly-log(n)) awake times per processor and a lower bound of
Omega(\sqrt{n/m}) of the number of awake times needed per processor
\cite{BKO09}. The main open question left in their work is to close the
poly-log gap between the upper and the lower bound and to de-randomize their
probabilistic construction and eliminate error probability. This is exactly
what we do in this paper.
That is, we show a {deterministic} algorithm with radio use of Theta(\sqrt {n
/m}) that never fails. We stress that our upper bound exactly matches the lower
bound proven in \cite{BKO09}, up to a small multiplicative constant. Therefore,
our algorithm is {optimal} in terms of energy efficiency and completely
resolves a long sequence of works in this area. In order to achieve these
results we devise a novel {adaptive} technique that determines the times when
devices power their radios on and off. In addition, we prove several lower
bounds on the energy efficiency of algorithms for {multi-hop networks}.
Specifically, we show that any algorithm for multi-hop networks must have radio
use of Omega(\sqrt n) per processor.
|
[{'version': 'v1', 'created': 'Wed, 6 Oct 2010 10:18:02 GMT'}]
|
2015-03-17
|
[array(['Barenboim', 'Leonid', ''], dtype=object)
array(['Dolev', 'Shlomi', ''], dtype=object)
array(['Ostrovsky', 'Rafail', ''], dtype=object)]
|
2,976 |
1803.10997
|
Luca Bonaventura
|
T.Benacchio and L.Bonaventura
|
A seamless extension of DG methods for hyperbolic problems to unbounded
domains
| null | null | null | null |
math.NA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider spectral discretizations of hyperbolic problems on unbounded
domains using Laguerre basis functions. Taking as model problem the scalar
advection equation, we perform a comprehensive stability analysis that includes
strong collocation formulations, nodal and modal weak formulations, with either
inflow or outflow boundary conditions, using either Gauss - Laguerre or Gauss -
Laguerre - Radau quadrature nodes and based on either scaled Laguerre functions
or scaled Laguerre polynomials. We show that some of these combinations give
rise to intrinsically unstable schemes, while the combination of scaled
Laguerre functions with Gauss - Laguerre - Radau nodes appears to be stable for
both strong and weak formulations. We then show how a modal discretization
approach for hyperbolic systems on an unbounded domain can be naturally and
seamlessly coupled to a discontinuous finite element discretization on a finite
domain. Examples of one dimensional hyperbolic systems are solved with the
proposed domain decomposition technique. The errors obtained with the proposed
approach are found to be small, enabling the use of the coupled scheme for the
simulation of Rayleigh damping layers in the semi-infinite part. Energy errors
and reflection ratios of the scheme in absorbing wavetrains and single Gaussian
signals show that a small number of nodes in the semi-infinite domain are
sufficient to damp the waves. The theoretical insight and numerical results
corroborate previous findings by the authors and establish the scaled Laguerre
functions-based discretization as a flexible and efficient tool for absorbing
layers as well as for the accurate simulation of waves in unbounded regions.
|
[{'version': 'v1', 'created': 'Thu, 29 Mar 2018 10:03:05 GMT'}]
|
2018-03-30
|
[array(['Benacchio', 'T.', ''], dtype=object)
array(['Bonaventura', 'L.', ''], dtype=object)]
|
2,977 |
2105.06070
|
Tao Yang
|
Tao Yang (1), Peiran Ren (1), Xuansong Xie (1) and Lei Zhang (1 and 2)
((1) DAMO Academy, Alibaba Group, (2) Department of Computing, The Hong Kong
Polytechnic University)
|
GAN Prior Embedded Network for Blind Face Restoration in the Wild
| null | null | null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Blind face restoration (BFR) from severely degraded face images in the wild
is a very challenging problem. Due to the high illness of the problem and the
complex unknown degradation, directly training a deep neural network (DNN)
usually cannot lead to acceptable results. Existing generative adversarial
network (GAN) based methods can produce better results but tend to generate
over-smoothed restorations. In this work, we propose a new method by first
learning a GAN for high-quality face image generation and embedding it into a
U-shaped DNN as a prior decoder, then fine-tuning the GAN prior embedded DNN
with a set of synthesized low-quality face images. The GAN blocks are designed
to ensure that the latent code and noise input to the GAN can be respectively
generated from the deep and shallow features of the DNN, controlling the global
face structure, local face details and background of the reconstructed image.
The proposed GAN prior embedded network (GPEN) is easy-to-implement, and it can
generate visually photo-realistic results. Our experiments demonstrated that
the proposed GPEN achieves significantly superior results to state-of-the-art
BFR methods both quantitatively and qualitatively, especially for the
restoration of severely degraded face images in the wild. The source code and
models can be found at https://github.com/yangxy/GPEN.
|
[{'version': 'v1', 'created': 'Thu, 13 May 2021 04:14:00 GMT'}]
|
2021-05-14
|
[array(['Yang', 'Tao', '', '1 and 2'], dtype=object)
array(['Ren', 'Peiran', '', '1 and 2'], dtype=object)
array(['Xie', 'Xuansong', '', '1 and 2'], dtype=object)
array(['Zhang', 'Lei', '', '1 and 2'], dtype=object)]
|
2,978 |
2303.02633
|
Shuta Ishigaki
|
Shuta Ishigaki, Shin Nakamura, Kazuaki Takasan
|
On the regularity conditions for holographic nonlinear responses:
electric conductivity and friction coefficient
|
v1: 36 pages, 13 figures, v2: 37 pages, references added, description
of conventional methods modified
| null | null |
RIKEN-iTHEMS-Report-23
|
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a new method to compute nonlinear transport coefficients in
holography, such as nonlinear DC conductivity and nonlinear friction
coefficient. The conventional method can be applied only to the models whose
action in the gravity dual has the ``square-root structure,'' i.e., the
Dirac-Born-Infeld action of the probe D-branes or the Nambu-Goto action of the
probe strings. Our method is applicable to a wider range of holographic models
whose action does not have such a square-root structure. Our method is based on
the requirement of regularity, and we propose a condition for regularity in the
form of two simultaneous equations, which we call the patchwork condition. Our
method also enables us to estimate the effective temperature of the
nonequilibrium steady states in a wider range of holographic models. We show
that a general model exhibits different effective temperatures for different
fluctuation modes.
|
[{'version': 'v1', 'created': 'Sun, 5 Mar 2023 10:22:26 GMT'}
{'version': 'v2', 'created': 'Tue, 28 Mar 2023 03:33:27 GMT'}]
|
2023-03-29
|
[array(['Ishigaki', 'Shuta', ''], dtype=object)
array(['Nakamura', 'Shin', ''], dtype=object)
array(['Takasan', 'Kazuaki', ''], dtype=object)]
|
2,979 |
0902.3986
|
Walter Innes
|
Walter R. Innes
|
Noise in a Calorimeter Readout System Using Periodic Sampling
| null | null | null |
SLAC-TN-09-02
|
physics.ins-det
|
http://creativecommons.org/licenses/publicdomain/
|
Fourier transform analysis of the calorimeter noise problem gives
quantitative results on a) the time-height correlation, b) the effect of
background on optimal shaping and on the ENC, c) sampling frequency
requirements, and d) the relation between sampling frequency and the required
quantization error.
|
[{'version': 'v1', 'created': 'Mon, 23 Feb 2009 20:31:18 GMT'}]
|
2009-02-24
|
[array(['Innes', 'Walter R.', ''], dtype=object)]
|
2,980 |
1209.5481
|
JeongHyeong Park
|
P. Gilkey, J.H. Park, and K. Sekigawa
|
Universal curvature identities III
|
16 pages
| null | null | null |
math.DG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We examine universal curvature identities for pseudo-Riemannian manifolds
with boundary. We determine the Euler-Lagrange equations associated to the
Chern-Gauss-Bonnet formula and show that they are given solely in terms of
curvature {and the second fundamental form and do not involve covariant
derivatives thus generalizing a conjecture of Berger to this context.
|
[{'version': 'v1', 'created': 'Tue, 25 Sep 2012 03:03:46 GMT'}]
|
2012-09-26
|
[array(['Gilkey', 'P.', ''], dtype=object)
array(['Park', 'J. H.', ''], dtype=object)
array(['Sekigawa', 'K.', ''], dtype=object)]
|
2,981 |
1305.6915
|
Dirk Beyer
|
Dirk Beyer, Stefan L\"owe, Evgeny Novikov, Andreas Stahlbauer, and
Philipp Wendler
|
Reusing Precisions for Efficient Regression Verification
|
14 pages, 2 figures, 6 tables
| null | null |
MIP-1302
|
cs.SE cs.PL
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Continuous testing during development is a well-established technique for
software-quality assurance. Continuous model checking from revision to revision
is not yet established as a standard practice, because the enormous resource
consumption makes its application impractical. Model checkers compute a large
number of verification facts that are necessary for verifying if a given
specification holds. We have identified a category of such intermediate results
that are easy to store and efficient to reuse: abstraction precisions. The
precision of an abstract domain specifies the level of abstraction that the
analysis works on. Precisions are thus a precious result of the verification
effort and it is a waste of resources to throw them away after each
verification run. In particular, precisions are small and thus easy to store;
they are easy to process and have a large impact on resource consumption. We
experimentally show the impact of precision reuse on industrial verification
problems, namely, 59 device drivers with 1119 revisions from the Linux kernel.
|
[{'version': 'v1', 'created': 'Wed, 29 May 2013 19:39:45 GMT'}]
|
2013-05-30
|
[array(['Beyer', 'Dirk', ''], dtype=object)
array(['Löwe', 'Stefan', ''], dtype=object)
array(['Novikov', 'Evgeny', ''], dtype=object)
array(['Stahlbauer', 'Andreas', ''], dtype=object)
array(['Wendler', 'Philipp', ''], dtype=object)]
|
2,982 |
1106.4844
|
Chao-Wei Tsai
|
Roger L. Griffith (IPAC), Chao-Wei Tsai (IPAC), Daniel Stern (JPL),
Andrew Blain (Leicester), Peter R. M. Eisenhardt (JPL), Fiona Harrison
(Caltech), Thomas H. Jarrett (IPAC), Kristin Madsen (Caltech), Spencer A.
Stanford (UC Davis), Edward L. Wright (UCLA), Jingwen Wu (JPL), Yanling Wu
(IPAC), and Lin Yan (IPAC)
|
WISE Discovery of Low Metallicity Blue Compact Dwarf Galaxies
|
Accepted for publication in ApJL
| null |
10.1088/2041-8205/736/1/L22
| null |
astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report two new low metallicity blue compact dwarf galaxies (BCDs), WISEP
J080103.93+264053.9 (hereafter W0801+26) and WISEP J170233.53+180306.4
(hereafter W1702+18), discovered using the Wide-field Infrared Survey Explorer
(WISE). We identified these two BCDs from their extremely red colors at
mid-infrared wavelengths, and obtained follow-up optical spectroscopy using the
Low Resolution Imaging Spectrometer on Keck I. The mid-infrared properties of
these two sources are similar to the well studied, extremely low metallicity
galaxy SBS 0335-052E. We determine metallicities of 12 + log(O/H) = 7.75 and
7.63 for W0801+26 and W1702+18, respectively, placing them amongst a very small
group of very metal deficient galaxies (Z < 1/10 Zsun). Their > 300 Angstrom
Hbeta equivalent widths, similar to SBS 0335-052E, imply the existence of young
(< 5 Myr) star forming regions. We measure star formation rates of 2.6 and 10.9
Msun/yr for W0801+26 and W1702+18, respectively. These BCDs, showing recent
star formation activity in extremely low metallicity environments, provide new
laboratories for studying star formation in extreme conditions and are
low-redshift analogs of the first generation of galaxies to form in the
universe. Using the all-sky WISE survey, we discuss a new method to identify
similar star forming, low metallicity BCDs.
|
[{'version': 'v1', 'created': 'Thu, 23 Jun 2011 22:13:55 GMT'}]
|
2015-05-28
|
[array(['Griffith', 'Roger L.', '', 'IPAC'], dtype=object)
array(['Tsai', 'Chao-Wei', '', 'IPAC'], dtype=object)
array(['Stern', 'Daniel', '', 'JPL'], dtype=object)
array(['Blain', 'Andrew', '', 'Leicester'], dtype=object)
array(['Eisenhardt', 'Peter R. M.', '', 'JPL'], dtype=object)
array(['Harrison', 'Fiona', '', 'Caltech'], dtype=object)
array(['Jarrett', 'Thomas H.', '', 'IPAC'], dtype=object)
array(['Madsen', 'Kristin', '', 'Caltech'], dtype=object)
array(['Stanford', 'Spencer A.', '', 'UC Davis'], dtype=object)
array(['Wright', 'Edward L.', '', 'UCLA'], dtype=object)
array(['Wu', 'Jingwen', '', 'JPL'], dtype=object)
array(['Wu', 'Yanling', '', 'IPAC'], dtype=object)
array(['Yan', 'Lin', '', 'IPAC'], dtype=object)]
|
2,983 |
2210.05387
|
Rawal Khirodkar
|
Rawal Khirodkar, Brandon Smith, Siddhartha Chandra, Amit Agrawal,
Antonio Criminisi
|
Sequential Ensembling for Semantic Segmentation
| null | null | null | null |
cs.CV cs.LG
|
http://creativecommons.org/licenses/by/4.0/
|
Ensemble approaches for deep-learning-based semantic segmentation remain
insufficiently explored despite the proliferation of competitive benchmarks and
downstream applications. In this work, we explore and benchmark the popular
ensembling approach of combining predictions of multiple,
independently-trained, state-of-the-art models at test time on popular
datasets. Furthermore, we propose a novel method inspired by boosting to
sequentially ensemble networks that significantly outperforms the naive
ensemble baseline. Our approach trains a cascade of models conditioned on class
probabilities predicted by the previous model as an additional input. A key
benefit of this approach is that it allows for dynamic computation offloading,
which helps deploy models on mobile devices. Our proposed novel ADaptive
modulatiON (ADON) block allows spatial feature modulation at various layers
using previous-stage probabilities. Our approach does not require sophisticated
sample selection strategies during training and works with multiple neural
architectures. We significantly improve over the naive ensemble baseline on
challenging datasets such as Cityscapes, ADE-20K, COCO-Stuff, and
PASCAL-Context and set a new state-of-the-art.
|
[{'version': 'v1', 'created': 'Sat, 8 Oct 2022 22:13:59 GMT'}]
|
2022-10-12
|
[array(['Khirodkar', 'Rawal', ''], dtype=object)
array(['Smith', 'Brandon', ''], dtype=object)
array(['Chandra', 'Siddhartha', ''], dtype=object)
array(['Agrawal', 'Amit', ''], dtype=object)
array(['Criminisi', 'Antonio', ''], dtype=object)]
|
2,984 |
0801.0495
|
Matthias Lenz
|
Matthias Lenz
|
Toric Ideals of Flow Polytopes
|
Withdrawn due to an error in the proof of the Main Theorem
| null | null | null |
math.CO math.AC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A referee found an error in the proof of the Main Theorem ("toric ideals of
flow polytopes are generated in degree 3") that we could not fix. More
precisely, the proof of Lemma 4.2.(ii) is incorrect.
The results on Gr\"obner bases are untouched by this.
-----
We show that toric ideals of flow polytopes are generated in degree 3. This
was conjectured by Diaconis and Eriksson for the special case of the Birkhoff
polytope. Our proof uses a hyperplane subdivision method developed by Haase and
Paffenholz.
It is known that reduced revlex Gr\"obner bases of the toric ideal of the
Birkhoff polytope $B_n$ have at most degree $n$. We show that this bound is
sharp for some revlex term orders. For $(m\times n)$-transportation polytopes,
a similar result holds: they have Gr\"obner bases of at most degree $\lfloor
mn/2\rfloor$. We construct a family of examples, where this bound is sharp.
|
[{'version': 'v1', 'created': 'Thu, 3 Jan 2008 11:51:31 GMT'}
{'version': 'v2', 'created': 'Sat, 31 Jul 2010 16:54:13 GMT'}
{'version': 'v3', 'created': 'Fri, 4 Mar 2011 12:34:35 GMT'}]
|
2011-03-07
|
[array(['Lenz', 'Matthias', ''], dtype=object)]
|
2,985 |
1811.04151
|
Wei Zeng
|
Wei Zeng, Azadeh Davoodi, Yu Hen Hu
|
Design Rule Violation Hotspot Prediction Based on Neural Network
Ensembles
| null | null | null | null |
cs.LG stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Design rule check is a critical step in the physical design of integrated
circuits to ensure manufacturability. However, it can be done only after a
time-consuming detailed routing procedure, which adds drastically to the time
of design iterations. With advanced technology nodes, the outcomes of global
routing and detailed routing become less correlated, which adds to the
difficulty of predicting design rule violations from earlier stages. In this
paper, a framework based on neural network ensembles is proposed to predict
design rule violation hotspots using information from placement and global
routing. A soft voting structure and a PCA-based subset selection scheme are
developed on top of a baseline neural network from a recent work. Experimental
results show that the proposed architecture achieves significant improvement in
model performance compared to the baseline case. For half of test cases, the
performance is even better than random forest, a commonly-used ensemble
learning model.
|
[{'version': 'v1', 'created': 'Fri, 9 Nov 2018 22:18:26 GMT'}]
|
2018-11-13
|
[array(['Zeng', 'Wei', ''], dtype=object)
array(['Davoodi', 'Azadeh', ''], dtype=object)
array(['Hu', 'Yu Hen', ''], dtype=object)]
|
2,986 |
1702.02155
|
Dietrich Bodeker
|
Dietrich Bodeker, Marc Sangel
|
Lepton asymmetry rate from quantum field theory: NLO in the hierarchical
limit
|
40 pages, 1 figure
| null |
10.1088/1475-7516/2017/06/052
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The rates for generating a matter-antimatter asymmetry in extensions of the
Standard Model (SM) containing right-handed neutrinos are the most interesting
and least trivial coefficients in the rate equations for baryogenesis through
thermal leptogenesis. We obtain a relation of these rates to finite-temperature
real-time correlation functions, similar to the Kubo formulas for transport
coefficients. Then we consider the case of hierarchical masses for the sterile
neutrinos. At leading order in their Yukawa couplings we find a simple master
formula which relates the rates to a single finite temperature three-point
spectral function. It is valid to all orders in $g$,where $g$ denotes a SM
gauge or quark Yukawa coupling. We use it to compute the rate for generating a
matter-antimatter asymmetry at next-to-leading order in g in the
non-relativistic regime. The corrections are of order $g ^ 2$, and they amount
to 4% or less.
|
[{'version': 'v1', 'created': 'Tue, 7 Feb 2017 19:00:14 GMT'}]
|
2017-07-05
|
[array(['Bodeker', 'Dietrich', ''], dtype=object)
array(['Sangel', 'Marc', ''], dtype=object)]
|
2,987 |
2307.00915
|
Marienza Caldarola
|
Marienza Caldarola, Sachiko Kuroyanagi, Savvas Nesseris, Juan
Garcia-Bellido
|
The effects of orbital precession on hyperbolic encounters
|
12 pages, 9 figures, comments welcome
| null | null |
IFT-UAM/CSIC-23-83
|
gr-qc astro-ph.CO astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The hyperbolic encounters of two massive objects are characterized by the
emission of a gravitational wave burst, with most of the energy released during
the closest approach (near the periastron). The detection of such events,
different from the well-known inspiral emission, would be an interesting
discovery and provide complementary information to observations of binary
mergers of black holes and neutron stars in the observable Universe, shedding
light, for instance, on the clustering properties of black holes and providing
valuable hints on their formation scenario. Here, we analyse the dynamics of
such phenomena in the simplest case where two compact objects follow
unbound/hyperbolic orbits. Moreover, we explore the effects of orbital
precession on the gravitational wave emission, since the precession encodes
certain general relativistic effects between two bodies. We also provide
templates for the strain of gravitational waves and the power spectrum for the
emission, and analytical expressions for the memory effect associated with such
signals.
|
[{'version': 'v1', 'created': 'Mon, 3 Jul 2023 10:20:38 GMT'}]
|
2023-07-04
|
[array(['Caldarola', 'Marienza', ''], dtype=object)
array(['Kuroyanagi', 'Sachiko', ''], dtype=object)
array(['Nesseris', 'Savvas', ''], dtype=object)
array(['Garcia-Bellido', 'Juan', ''], dtype=object)]
|
2,988 |
1109.5319
|
John Enright
|
John J. Enright and Emilio Frazzoli
|
Optimal Foraging of Renewable Resources
|
14 pages, 4 figures, submitted to IEEE Transactions on Robotics
| null | null | null |
cs.RO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Consider a team of agents in the plane searching for and visiting target
points that appear in a bounded environment according to a stochastic renewal
process with a known absolutely continuous spatial distribution. Agents must
detect targets with limited-range onboard sensors. It is desired to minimize
the expected waiting time between the appearance of a target point, and the
instant it is visited. When the sensing radius is small, the system time is
dominated by time spent searching, and it is shown that the optimal policy
requires the agents to search a region at a relative frequency proportional to
the square root of its renewal rate. On the other hand, when targets appear
frequently, the system time is dominated by time spent servicing known targets,
and it is shown that the optimal policy requires the agents to service a region
at a relative frequency proportional to the cube root of its renewal rate.
Furthermore, the presented algorithms in this case recover the optimal
performance achieved by agents with full information of the environment.
Simulation results verify the theoretical performance of the algorithms.
|
[{'version': 'v1', 'created': 'Sun, 25 Sep 2011 03:06:39 GMT'}
{'version': 'v2', 'created': 'Tue, 31 Jan 2012 21:20:05 GMT'}]
|
2012-02-02
|
[array(['Enright', 'John J.', ''], dtype=object)
array(['Frazzoli', 'Emilio', ''], dtype=object)]
|
2,989 |
0809.0268
|
Annarita Margiotta
|
A. Margiotta (for the ANTARES Collaboration)
|
Systematic uncertainties in MonteCarlo simulations of the atmospheric
muon flux in the 5-line ANTARES detector
|
4 pages, 7 figures, presented at the International Workshop on a Very
Large Volume $\nu$ Telescope for the Mediterranean Sea, 22-24 Oct. 2007,
Toulon, France
| null |
10.1016/j.nima.2008.12.183
| null |
astro-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The ANTARES detector was operated in a configuration with 5 lines for a
period of 10 months from February until November 2007. The duty cycle was
better than 80% during this period and almost 2*10**7 atmospheric muon triggers
were collected. This large sample was used to test Monte Carlo simulation
programs and to evaluate possible systematic effects due to uncertainties on
environmental parameters and detector description. First results are presented
and discussed.
|
[{'version': 'v1', 'created': 'Mon, 1 Sep 2008 15:27:17 GMT'}]
|
2019-08-13
|
[array(['Margiotta', 'A.', '', 'for the ANTARES Collaboration'],
dtype=object) ]
|
2,990 |
1803.11548
|
Alexander Johannes Edward Kreil
|
Alexander J. E. Kreil (1), Dmytro A. Bozhko (1), Halyna Yu.
Musiienko-Shmarova (1), Victor S. L'vov (2), Anna Pomyalov (2), Burkard
Hillebrands (1), Alexander A. Serga (1) ((1) Fachbereich Physik and
Landesforschungszentrum OPTIMAS, Technische Universit\"at Kaiserslautern, (2)
Department of Chemical and Biological Physics, Weizmann Institute of Science)
|
From Kinetic Instability to Bose-Einstein Condensation and Magnon
Supercurrents
|
6 pages, 3 figures
|
Phys. Rev. Lett. 121, 077203 (2018)
|
10.1103/PhysRevLett.121.077203
| null |
cond-mat.quant-gas cond-mat.other
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Evolution of an overpopulated gas of magnons to a Bose-Einstein condensate
and excitation of a magnon supercurrent, propelled by a phase gradient in the
condensate wave function, can be observed at room-temperature by means of the
Brillouin light scattering spectroscopy in an yttrium iron garnet material. We
study these phenomena in a wide range of external magnetic fields in order to
understand their properties when externally pumped magnons are transferred
towards the condensed state via two distinct channels: A multistage
Kolmogorov-Zakharov cascade of the weak-wave turbulence or a one-step
kinetic-instability process. Our main result is that opening the kinetic
instability channel leads to the formation of a much denser magnon condensate
and to a stronger magnon supercurrent compared to the cascade mechanism alone.
|
[{'version': 'v1', 'created': 'Fri, 30 Mar 2018 17:38:53 GMT'}]
|
2018-08-29
|
[array(['Kreil', 'Alexander J. E.', ''], dtype=object)
array(['Bozhko', 'Dmytro A.', ''], dtype=object)
array(['Musiienko-Shmarova', 'Halyna Yu.', ''], dtype=object)
array(["L'vov", 'Victor S.', ''], dtype=object)
array(['Pomyalov', 'Anna', ''], dtype=object)
array(['Hillebrands', 'Burkard', ''], dtype=object)
array(['Serga', 'Alexander A.', ''], dtype=object)]
|
2,991 |
1701.05919
|
Martin Mayer
|
Martin Mayer, Cheikh Birahim Ndiaye
|
Fractional Yamabe problem on locally flat conformal infinities of
Poincare-Einstein manifolds
|
The current version - as of July 2021 - corresponds to sections 5,6,7
of the previous one. We have split out the others to a separate paper
'Asymptotics of the Poisson kernel and Green's functions of the fractional
conformal Laplacian'
| null | null | null |
math.DG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study in this paper the fractional Yamabe problem first considered by
Gonzalez-Qing on the conformal infinity $(M^n , [h])$ of a Poincar\'e-Einstein
manifold $(X^{n+1} , g^+ )$ with either $n = 2$ or $n \geq 3$ and $(M^n , [h])$
is locally flat - namely $(M, h)$ is locally conformally flat. However, as for
the classical Yamabe problem, because of the involved quantization phenomena,
the variational analysis of the fractional one exhibits also a local situation
and a global one. Furthermore the latter global situation includes the case of
conformal infinities of Poincar\'e-Einstein manifolds of dimension either 2 or
of dimension greater than $2$ and which are locally flat, and hence the
minimizing technique of Aubin- Schoen in that case clearly requires an analogue
of the positive mass theorem of Schoen-Yau which is not known to hold. Using
the algebraic topological argument of Bahri-Coron, we bypass the latter
positive mass issue and show that any conformal infinity of a
Poincar\'e-Einstein manifold of dimension either $n = 2$ or of dimension $n
\geq 3$ and which is locally flat admits a Riemannian metric of constant
fractional scalar curvature.
|
[{'version': 'v1', 'created': 'Fri, 20 Jan 2017 20:46:35 GMT'}
{'version': 'v2', 'created': 'Sun, 25 Jul 2021 07:06:31 GMT'}
{'version': 'v3', 'created': 'Thu, 1 Jun 2023 15:26:58 GMT'}]
|
2023-06-02
|
[array(['Mayer', 'Martin', ''], dtype=object)
array(['Ndiaye', 'Cheikh Birahim', ''], dtype=object)]
|
2,992 |
2306.07233
|
Gregery Buzzard
|
Charles A. Bouman and Gregery T. Buzzard
|
Generative Plug and Play: Posterior Sampling for Inverse Problems
|
8 pages, submitted to 2023 IEEE Allerton Conference
| null | null | null |
cs.CV eess.IV
|
http://creativecommons.org/licenses/by/4.0/
|
Over the past decade, Plug-and-Play (PnP) has become a popular method for
reconstructing images using a modular framework consisting of a forward and
prior model. The great strength of PnP is that an image denoiser can be used as
a prior model while the forward model can be implemented using more traditional
physics-based approaches. However, a limitation of PnP is that it reconstructs
only a single deterministic image.
In this paper, we introduce Generative Plug-and-Play (GPnP), a generalization
of PnP to sample from the posterior distribution. As with PnP, GPnP has a
modular framework using a physics-based forward model and an image denoising
prior model. However, in GPnP these models are extended to become proximal
generators, which sample from associated distributions. GPnP applies these
proximal generators in alternation to produce samples from the posterior. We
present experimental simulations using the well-known BM3D denoiser. Our
results demonstrate that the GPnP method is robust, easy to implement, and
produces intuitively reasonable samples from the posterior for sparse
interpolation and tomographic reconstruction. Code to accompany this paper is
available at https://github.com/gbuzzard/generative-pnp-allerton .
|
[{'version': 'v1', 'created': 'Mon, 12 Jun 2023 16:49:08 GMT'}]
|
2023-06-14
|
[array(['Bouman', 'Charles A.', ''], dtype=object)
array(['Buzzard', 'Gregery T.', ''], dtype=object)]
|
2,993 |
2203.06196
|
Sergi Ramos-Calderer
|
Sergi Ramos-Calderer
|
Efficient quantum interpolation of natural data
|
Main: 6 pages, 4 figures. Appendix: 3 pages, 2 figures. Code
available online
| null |
10.1103/PhysRevA.106.062427
| null |
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present efficient methods to interpolate data with a quantum computer that
complement uploading techniques and quantum post-processing. The quantum
algorithms are supported by the efficient Quantum Fourier Transform (QFT) and
classical signal and imaging processing techniques, and open the door of
quantum advantage to relevant families of data. We showcase a QFT interpolation
method, a Quantum Cosine Transform (QCT) interpolation geared towards natural
data, and we improve upon them by utilizing a quantum circuit's capabilities of
processing data in superposition. A novel circuit for the QCT is presented. We
demonstrate the methods on probability distributions and quantum encoded
images, and discuss the precision of the resulting interpolations.
|
[{'version': 'v1', 'created': 'Fri, 11 Mar 2022 19:00:03 GMT'}
{'version': 'v2', 'created': 'Fri, 18 Mar 2022 13:18:07 GMT'}
{'version': 'v3', 'created': 'Mon, 18 Jul 2022 12:47:10 GMT'}]
|
2023-01-04
|
[array(['Ramos-Calderer', 'Sergi', ''], dtype=object)]
|
2,994 |
1407.2384
|
Birge Huisgen-Zimmermann
|
Birge Huisgen-Zimmermann
|
The geometry of uniserial representations of finite dimensional algebras
I
| null |
J. Pure Applied Algebra 127 (1998) 39-72
| null | null |
math.RT math.RA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It is shown that, given any finite dimensional, split basic algebra $\Lambda
= K\Gamma/I$ (where $\Gamma$ is a quiver and $I$ an admissible ideal in the
path algebra $K \Gamma$), there is a finite list of affine algebraic varieties,
the points of which correspond in a natural fashion to the isomorphism types of
uniserial left $\Lambda$-modules, and the geometry of which faithfully reflects
the constraints met in constructing such modules. A constructive coordinatized
access to these varieties is given, as well as to the accompanying natural
surjections from the varieties onto families of uniserial modules with fixed
composition series. The fibres of these maps are explored, one of the results
being a simple algorithm to resolve the isomorphism problem for uniserial
modules. Moreover, new invariants measuring the complexity of the uniserial
representation theory are derived from the geometric viewpoint. Finally, it is
proved that each affine algebraic variety arises as a variety of uniserial
modules over a suitable finite dimensional algebra, in a setting where the
points are in one-one correspondence with the isomorphism classes of uniserial
modules.
|
[{'version': 'v1', 'created': 'Wed, 9 Jul 2014 08:27:32 GMT'}]
|
2014-07-10
|
[array(['Huisgen-Zimmermann', 'Birge', ''], dtype=object)]
|
2,995 |
2209.12347
|
Vittorio Giammarino
|
Vittorio Giammarino, James Queeney, Lucas C. Carstensen, Michael E.
Hasselmo, Ioannis Ch. Paschalidis
|
Opportunities and Challenges from Using Animal Videos in Reinforcement
Learning for Navigation
| null | null | null | null |
eess.SY cs.AI cs.CV cs.LG cs.SY
|
http://creativecommons.org/licenses/by/4.0/
|
We investigate the use of animal videos (observations) to improve
Reinforcement Learning (RL) efficiency and performance in navigation tasks with
sparse rewards. Motivated by theoretical considerations, we make use of
weighted policy optimization for off-policy RL and describe the main challenges
when learning from animal videos. We propose solutions and test our ideas on a
series of 2D navigation tasks. We show how our methods can leverage animal
videos to improve performance over RL algorithms that do not leverage such
observations.
|
[{'version': 'v1', 'created': 'Sun, 25 Sep 2022 23:20:16 GMT'}
{'version': 'v2', 'created': 'Tue, 27 Sep 2022 14:47:06 GMT'}
{'version': 'v3', 'created': 'Thu, 10 Nov 2022 19:47:03 GMT'}]
|
2022-11-14
|
[array(['Giammarino', 'Vittorio', ''], dtype=object)
array(['Queeney', 'James', ''], dtype=object)
array(['Carstensen', 'Lucas C.', ''], dtype=object)
array(['Hasselmo', 'Michael E.', ''], dtype=object)
array(['Paschalidis', 'Ioannis Ch.', ''], dtype=object)]
|
2,996 |
1710.05921
|
Dale D. Kocevski
|
Dale D. Kocevski, Guillermo Barro, S.M. Faber, Avishai Dekel, Rachel
S. Somerville, Joshua A. Young, Christina C. Williams, Daniel H. McIntosh,
Antonis Georgakakis, Guenther Hasinger, Kirpal Nandra, Francesca Civano,
David M. Alexander, Omar Almaini, Christopher J. Conselice, Jennifer L.
Donley, Harry C. Ferguson, Mauro Giavalisco, Norman A. Grogin, Nimish Hathi,
Matthew Hawkins, Anton M. Koekemoer, David C. Koo, Elizabeth J. McGrath,
Bahram Mobasher, Pablo G. Perez Gonzalez, Janine Pforr, Joel R. Primack,
Paola Santini, Mauro Stefanon, Jonathan R. Trump, Arjen van der Wel, Stijn
Wuyts, and Haojing Yan
|
CANDELS: Elevated Black Hole Growth in the Progenitors of Compact
Quiescent Galaxies at z~2
|
Published in the Astrophysical Journal
|
2017ApJ...846..112K
|
10.3847/1538-4357/aa8566
| null |
astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We examine the fraction of massive ($M_{*}>10^{10} M_{\odot}$), compact
star-forming galaxies (cSFGs) that host an active galactic nucleus (AGN) at
$z\sim2$. These cSFGs are likely the direct progenitors of the compact
quiescent galaxies observed at this epoch, which are the first population of
passive galaxies to appear in large numbers in the early Universe. We identify
cSFGs that host an AGN using a combination of Hubble WFC3 imaging and Chandra
X-ray observations in four fields: the Chandra Deep Fields, the Extended Groth
Strip, and the UKIDSS Ultra Deep Survey field. We find that
$39.2^{+3.9}_{-3.6}$\% (65/166) of cSFGs at $1.4<z<3.0$ host an X-ray detected
AGN. This fraction is 3.2 times higher than the incidence of AGN in extended
star-forming galaxies with similar masses at these redshifts. This difference
is significant at the $6.2\sigma$ level. Our results are consistent with models
in which cSFGs are formed through a dissipative contraction that triggers a
compact starburst and concurrent growth of the central black hole. We also
discuss our findings in the context of cosmological galaxy evolution
simulations that require feedback energy to rapidly quench cSFGs. We show that
the AGN fraction peaks precisely where energy injection is needed to reproduce
the decline in the number density of cSFGs with redshift. Our results suggest
that the first abundant population of massive, quenched galaxies emerged
directly following a phase of elevated supermassive black hole growth and
further hints at a possible connection between AGN and the rapid quenching of
star formation in these galaxies.
|
[{'version': 'v1', 'created': 'Mon, 16 Oct 2017 18:00:00 GMT'}]
|
2017-10-18
|
[array(['Kocevski', 'Dale D.', ''], dtype=object)
array(['Barro', 'Guillermo', ''], dtype=object)
array(['Faber', 'S. M.', ''], dtype=object)
array(['Dekel', 'Avishai', ''], dtype=object)
array(['Somerville', 'Rachel S.', ''], dtype=object)
array(['Young', 'Joshua A.', ''], dtype=object)
array(['Williams', 'Christina C.', ''], dtype=object)
array(['McIntosh', 'Daniel H.', ''], dtype=object)
array(['Georgakakis', 'Antonis', ''], dtype=object)
array(['Hasinger', 'Guenther', ''], dtype=object)
array(['Nandra', 'Kirpal', ''], dtype=object)
array(['Civano', 'Francesca', ''], dtype=object)
array(['Alexander', 'David M.', ''], dtype=object)
array(['Almaini', 'Omar', ''], dtype=object)
array(['Conselice', 'Christopher J.', ''], dtype=object)
array(['Donley', 'Jennifer L.', ''], dtype=object)
array(['Ferguson', 'Harry C.', ''], dtype=object)
array(['Giavalisco', 'Mauro', ''], dtype=object)
array(['Grogin', 'Norman A.', ''], dtype=object)
array(['Hathi', 'Nimish', ''], dtype=object)
array(['Hawkins', 'Matthew', ''], dtype=object)
array(['Koekemoer', 'Anton M.', ''], dtype=object)
array(['Koo', 'David C.', ''], dtype=object)
array(['McGrath', 'Elizabeth J.', ''], dtype=object)
array(['Mobasher', 'Bahram', ''], dtype=object)
array(['Gonzalez', 'Pablo G. Perez', ''], dtype=object)
array(['Pforr', 'Janine', ''], dtype=object)
array(['Primack', 'Joel R.', ''], dtype=object)
array(['Santini', 'Paola', ''], dtype=object)
array(['Stefanon', 'Mauro', ''], dtype=object)
array(['Trump', 'Jonathan R.', ''], dtype=object)
array(['van der Wel', 'Arjen', ''], dtype=object)
array(['Wuyts', 'Stijn', ''], dtype=object)
array(['Yan', 'Haojing', ''], dtype=object)]
|
2,997 |
2304.03934
|
Ioana-Alexandra Coman
|
Miranda C. N. Cheng, Ioana Coman, Davide Passaro, Gabriele Sgroi
|
Quantum Modular $\hat Z^G$-Invariants
|
72 pages, 5 tables
| null | null | null |
hep-th math-ph math.MP math.NT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the quantum modular properties of $\hat{ Z}^G$-invariants of closed
three-manifolds. Higher depth quantum modular forms are expected to play a
central role for general three-manifolds and gauge groups $G$. In particular,
we conjecture that for plumbed three-manifolds whose plumbing graphs have $n$
junction nodes with definite signature and for rank $r$ gauge group $G$, that
$\hat{ Z}^G$ is related to a quantum modular form of depth $nr$. We prove this
for $G=SU(3)$ and for an infinite class of three-manifolds (weakly negative
Seifert with three exceptional fibers). We also investigate the relation
between the quantum modularity of $\hat{ Z}^G$-invariants of the same
three-manifold with different gauge group $G$. We conjecture a recursive
relation among the iterated Eichler integrals relevant for $\hat{ Z}^G$ with
$G=SU(2)$ and $SU(3)$, for negative Seifert manifolds with three exceptional
fibers. This is reminiscent of the recursive structure among mock modular forms
playing the role of Vafa-Witten invariants for $SU(N)$. We prove the conjecture
when the three-manifold is moreover an integral homological sphere.
|
[{'version': 'v1', 'created': 'Sat, 8 Apr 2023 06:46:15 GMT'}]
|
2023-04-11
|
[array(['Cheng', 'Miranda C. N.', ''], dtype=object)
array(['Coman', 'Ioana', ''], dtype=object)
array(['Passaro', 'Davide', ''], dtype=object)
array(['Sgroi', 'Gabriele', ''], dtype=object)]
|
2,998 |
2209.08493
|
Takashi Uchino
|
Nanami Teramachi, Aoi Hashimoto, Iku Nakaaki, Shuuichi Ooi, Minoru
Tachiki, Shunichi Arisawa, Yusuke Seto, Takahiro Sakurai, Hitoshi Ohta,
Jaroslav Valenta, Naohito Tsujii, Takao Mori, and Takashi Uchino
|
Strong phase coherence and vortex matter in a fractal system with
proximity-induced superconductivity
|
26 pages, 5 figures and 4 Supplemental figures
| null | null | null |
cond-mat.supr-con
|
http://creativecommons.org/licenses/by/4.0/
|
The proximity effect in normal/superconductor heterostructures is an
intriguing phenomenon in that the normal side takes on the properties of a
superconductor with an induced gap. However, the structural and pinning
properties of vortices inside the normal regions remain poorly understood.
Here, we report structure and superconducting properties of a proximity-coupled
Mg/MgO/MgB2 system with ~30 vol. % of superconducting MgB2, in which MgB2
nanograins are distributed in a fractal manner to form a proximity network with
clean interfaces. Conductivity and magnetic measurements demonstrate that this
proximity-coupled system acts as a fully phase coherent superconductor with
isotropic pinning. Magneto-optical imaging also reveals a rather homogeneous
flux density distribution with no apparent granularity. Furthermore, we observe
quantized proximity vortices and their clustering behavior by scanning
superconducting quantum interface device microscopy. These results show that in
contrast to the case of conventional granular superconductors, the grain
boundaries in the present sample carry high critical currents and have high
vortex pinning efficiency, resulting in a robust phase coherent state
irrespective of the low volume fraction of the MgB2 nanograins. This finding
not only reveals the features of proximity-induced vortices, but also
demonstrates an excellent phase-locked capability of the proximity-coupled
fractal system.
|
[{'version': 'v1', 'created': 'Sun, 18 Sep 2022 07:24:26 GMT'}
{'version': 'v2', 'created': 'Wed, 5 Oct 2022 07:49:44 GMT'}]
|
2022-10-06
|
[array(['Teramachi', 'Nanami', ''], dtype=object)
array(['Hashimoto', 'Aoi', ''], dtype=object)
array(['Nakaaki', 'Iku', ''], dtype=object)
array(['Ooi', 'Shuuichi', ''], dtype=object)
array(['Tachiki', 'Minoru', ''], dtype=object)
array(['Arisawa', 'Shunichi', ''], dtype=object)
array(['Seto', 'Yusuke', ''], dtype=object)
array(['Sakurai', 'Takahiro', ''], dtype=object)
array(['Ohta', 'Hitoshi', ''], dtype=object)
array(['Valenta', 'Jaroslav', ''], dtype=object)
array(['Tsujii', 'Naohito', ''], dtype=object)
array(['Mori', 'Takao', ''], dtype=object)
array(['Uchino', 'Takashi', ''], dtype=object)]
|
2,999 |
2203.03900
|
Jicheng Geng
|
Zhaobing Fan, Jicheng Geng, Shaolong Han
|
Differential operator approach to $\imath$quantum groups
| null | null | null | null |
math.QA math.RT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
For a quasi-split Satake diagram, we define a modified $q$-Weyl algebra, and
show that there is an algebra homomorphism between it and the corresponding
$\imath$quantum group. In other words, we provide a differential operator
approach to $\imath$quantum groups. Meanwhile, the Oscillator representations
are obtained. The crystal basis of the irreducible subrepresentations of these
Oscillator representations are constructed.
|
[{'version': 'v1', 'created': 'Tue, 8 Mar 2022 07:45:15 GMT'}]
|
2022-03-09
|
[array(['Fan', 'Zhaobing', ''], dtype=object)
array(['Geng', 'Jicheng', ''], dtype=object)
array(['Han', 'Shaolong', ''], dtype=object)]
|
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