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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
7,300 |
2210.13188
|
Hong Xuan
|
Hong Xuan, Xi Chen
|
Dissecting Deep Metric Learning Losses for Image-Text Retrieval
|
arXiv admin note: text overlap with arXiv:2201.11307
|
WACV2023
| null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Visual-Semantic Embedding (VSE) is a prevalent approach in image-text
retrieval by learning a joint embedding space between the image and language
modalities where semantic similarities would be preserved. The triplet loss
with hard-negative mining has become the de-facto objective for most VSE
methods. Inspired by recent progress in deep metric learning (DML) in the image
domain which gives rise to new loss functions that outperform triplet loss, in
this paper, we revisit the problem of finding better objectives for VSE in
image-text matching. Despite some attempts in designing losses based on
gradient movement, most DML losses are defined empirically in the embedding
space. Instead of directly applying these loss functions which may lead to
sub-optimal gradient updates in model parameters, in this paper we present a
novel Gradient-based Objective AnaLysis framework, or \textit{GOAL}, to
systematically analyze the combinations and reweighting of the gradients in
existing DML functions. With the help of this analysis framework, we further
propose a new family of objectives in the gradient space exploring different
gradient combinations. In the event that the gradients are not integrable to a
valid loss function, we implement our proposed objectives such that they would
directly operate in the gradient space instead of on the losses in the
embedding space. Comprehensive experiments have demonstrated that our novel
objectives have consistently improved performance over baselines across
different visual/text features and model frameworks. We also showed the
generalizability of the GOAL framework by extending it to other models using
triplet family losses including vision-language model with heavy cross-modal
interactions and have achieved state-of-the-art results on the image-text
retrieval tasks on COCO and Flick30K.
|
[{'version': 'v1', 'created': 'Fri, 21 Oct 2022 06:48:27 GMT'}]
|
2022-10-25
|
[array(['Xuan', 'Hong', ''], dtype=object)
array(['Chen', 'Xi', ''], dtype=object)]
|
7,301 |
1009.0283
|
Nickolas Moeckel
|
Nickolas Moeckel and Cathie J. Clarke
|
Collisional formation of very massive stars in dense clusters
|
8 pages, accepted to MNRAS
| null |
10.1111/j.1365-2966.2010.17659.x
| null |
astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the contraction of accreting protoclusters using an extension
of n-body techniques that incorporates the accretional growth of stars from the
gaseous reservoir in which they are embedded. Following on from Monte Carlo
studies by Davis et al., we target our experiments toward populous clusters
likely to experience collisions as a result of accretion-driven contraction. We
verify that in less extreme star forming environments, similar to Orion, the
stellar density is low enough that collisions are unimportant, but that
conditions suitable for stellar collisions are much more easily satisfied in
large-n clusters, i.e. n ~ 30,000 (we argue, however, that the density of the
Arches cluster is insufficient for us to expect stellar collisions to have
occurred in the cluster's prior evolution). We find that the character of the
collision process is not such that it is a route toward smoothly filling the
top end of the mass spectrum. Instead, runaway growth of one or two extreme
objects can occur within less than 1 Myr after accretion is shut off, resulting
in a few objects with masses several times the maximum reached by accretion.
The rapid formation of these objects is due to not just the post-formation
dynamical evolution of the clusters, but an interplay of dynamics and the
accretional growth of the stars. We find that accretion-driven cluster
shrinkage results in a distribution of gas and stars that offsets the
disruptive effect of gas expulsion, and we propose that the process can lead to
massive binaries and early mass segregation in star clusters.
|
[{'version': 'v1', 'created': 'Wed, 1 Sep 2010 21:27:23 GMT'}
{'version': 'v2', 'created': 'Thu, 9 Sep 2010 13:17:49 GMT'}]
|
2015-05-19
|
[array(['Moeckel', 'Nickolas', ''], dtype=object)
array(['Clarke', 'Cathie J.', ''], dtype=object)]
|
7,302 |
1901.04717
|
Karel Zidek
|
Ond\v{r}ej Denk, Kaibo Zheng, Donatas Zigmantas, Karel \v{Z}\'idek
|
Compressive imaging of transient absorption dynamics on the femtosecond
timescale
|
13 pages, 6 figures
| null |
10.1364/OE.27.010234
| null |
physics.optics
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Femtosecond spectroscopy is an important tool for tracking rapid photoinduced
processes in a variety of materials. To spatially map the processes in a sample
would substantially expand the capabilities of the method. This is, however,
difficult to achieve due to the necessity to use low-noise detection and to
maintain feasible data acquisition time. Here we demonstrate realization of an
imaging pump-probe setup, featuring sub-100 fs temporal resolution, by a
straightforward modification of a standard pump-probe technique, using a
randomly structured probe beam. The structured beam, made by a diffuser,
enabled us to computationally reconstruct the maps of transient absorption
dynamics based on the concept of compressed sensing. We demonstrate the
functionality of the setup in two proof-of-principle experiments, were we
achieve spatial resolution of 20 \mu m. The presented concept provides a
feasible route to imaging, using the pump-probe technique and ultrafast
spectroscopy in general.
|
[{'version': 'v1', 'created': 'Tue, 15 Jan 2019 09:05:11 GMT'}]
|
2019-05-01
|
[array(['Denk', 'Ondřej', ''], dtype=object)
array(['Zheng', 'Kaibo', ''], dtype=object)
array(['Zigmantas', 'Donatas', ''], dtype=object)
array(['Žídek', 'Karel', ''], dtype=object)]
|
7,303 |
2203.08420
|
Vidya Setlur
|
Vidya Setlur and Melanie Tory
|
How do you Converse with an Analytical Chatbot? Revisiting Gricean
Maxims for Designing Analytical Conversational Behavior
|
17 pages, 8 figures
| null | null | null |
cs.HC
|
http://creativecommons.org/licenses/by/4.0/
|
Chatbots have garnered interest as conversational interfaces for a variety of
tasks. While general design guidelines exist for chatbot interfaces, little
work explores analytical chatbots that support conversing with data. We explore
Gricean Maxims to help inform the basic design of effective conversational
interaction. We also draw inspiration from natural language interfaces for data
exploration to support ambiguity and intent handling. We ran Wizard of Oz
studies with 30 participants to evaluate user expectations for text and voice
chatbot design variants. Results identified preferences for intent
interpretation and revealed variations in user expectations based on the
interface affordances. We subsequently conducted an exploratory analysis of
three analytical chatbot systems (text + chart, voice + chart, voice-only) that
implement these preferred design variants. Empirical evidence from a second
30-participant study informs implications specific to data-driven conversation
such as interpreting intent, data orientation, and establishing trust through
appropriate system responses.
|
[{'version': 'v1', 'created': 'Wed, 16 Mar 2022 06:48:01 GMT'}]
|
2022-03-17
|
[array(['Setlur', 'Vidya', ''], dtype=object)
array(['Tory', 'Melanie', ''], dtype=object)]
|
7,304 |
quant-ph/0006046
|
Kal Gerd Vollbrecht
|
R.F. Werner, K.G.H. Vollbrecht
|
A counterexample to a conjectured entanglement inequality
|
references added
| null | null | null |
quant-ph
| null |
We give an explicit counterexample to an entanglement inequality suggested in
a recent paper [quant-ph/0005126] by Benatti and Narnhofer. The inequality
would have had far-reaching consequences, including the additivity of the
entanglement of formation.
|
[{'version': 'v1', 'created': 'Fri, 9 Jun 2000 12:37:33 GMT'}
{'version': 'v2', 'created': 'Tue, 13 Jun 2000 12:12:56 GMT'}]
|
2007-05-23
|
[array(['Werner', 'R. F.', ''], dtype=object)
array(['Vollbrecht', 'K. G. H.', ''], dtype=object)]
|
7,305 |
1404.1383
|
Lawrence Brown
|
Lawrence G. Brown
|
Some directed subsets of C*-algebras and semicontinuity theory
|
I intend to submit this for publication if I continue to believe that
Proposition 1 is new
|
Proc. Amer. Math. Soc., 143, No. 9, (2015), 3895-3899
| null | null |
math.OA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The main result concerns a sigma-unital C*-algebra A, a strongly lower
semicontinuous element h of A**, the enveloping von Neumann algebra, and the
set of self-adjoint elements a of A such that a \le h - delta 1 for some delta
> 0, where 1 is the identity of A**. The theorem is that this set is directed
upward. It follows that if this set is non-empty, then h is the limit of an
increasing net of self-adjoint elements of A. A complement to the main result,
which may be new even if h = 1, is that if a and b are self-adjoint in A, a \le
h, and b \le h - delta 1 for delta > 0, then there is a self-adjoint c in A
such that c \le h, a \le c, and b \le c.
|
[{'version': 'v1', 'created': 'Fri, 4 Apr 2014 20:04:52 GMT'}]
|
2017-06-09
|
[array(['Brown', 'Lawrence G.', ''], dtype=object)]
|
7,306 |
astro-ph/9908054
|
Jorge Horvath
|
J.E. Horvath (IAG/USP, Sao Paulo and Steward Obs., U.of Arizona)
|
Strange stars in low-mass binary pulsar systems
|
6 pages, no figures, PlainTex file submitted to IJMPD
|
Int.J.Mod.Phys. D8 (1999) 669-675
|
10.1142/S021827189900047X
|
IAG preprint 99-22
|
astro-ph
| null |
Based on observational facts and a variety of theoretical arguments we
discuss in this work the possibility that pulsars in Low-Mass Binary Pulsar
systems could be strange stars rather than neutron stars. It is shown that,
although subject to reasonable uncertainties, the consideration of the physics
of the SQM core and thin normal crusts leads to the prediction of several
observed features of the magnetic field history of these systems whitin this
working hypothesis.
|
[{'version': 'v1', 'created': 'Fri, 6 Aug 1999 00:53:50 GMT'}]
|
2009-10-31
|
[array(['Horvath', 'J. E.', '',
'IAG/USP, Sao Paulo and Steward Obs., U.of Arizona'], dtype=object)]
|
7,307 |
1804.09221
|
Michael Kemeny
|
Michael Kemeny
|
Betti Numbers of Curves and Multiple-Point Loci
|
Final version
| null | null | null |
math.AG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We construct Eagon--Northcott cycles on Hurwitz space and compare their
classes to Kleiman's multiple point loci. Applying this construction towards
the classification of Betti tables of canonical curves, we find that the value
of the extremal Betti number records the number of minimal pencils. The result
holds under transversality hypotheses equivalent to the virtual cycles having a
geometric interpretation. We analyse the case of two minimal pencils, showing
that the transversality hypotheses hold generically.
|
[{'version': 'v1', 'created': 'Tue, 24 Apr 2018 19:16:07 GMT'}
{'version': 'v2', 'created': 'Fri, 21 Dec 2018 21:54:55 GMT'}
{'version': 'v3', 'created': 'Tue, 15 Jan 2019 20:12:49 GMT'}
{'version': 'v4', 'created': 'Mon, 26 Apr 2021 20:36:07 GMT'}
{'version': 'v5', 'created': 'Thu, 3 Mar 2022 00:42:06 GMT'}]
|
2022-03-04
|
[array(['Kemeny', 'Michael', ''], dtype=object)]
|
7,308 |
1809.08459
|
Daniel Brown
|
Daniel C. Brown, Shawn F. Johnson, Cale F. Brownstead
|
Simulation and Testing Results for a Sub-Bottom Imaging Sonar
|
10 pages, 7 figures Revision: Fixed typo in author name
| null | null | null |
eess.SP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The problem of detecting buried unexploded ordnance (UXO) is addressed with a
sensor deployed from a shallow-draft surface vessel. This sonar system produces
three dimensional synthetic aperture sonar (SAS) imagery of both surficial and
buried UXO across a range of environments. The sensor's hardware design was
based in part upon data created using a hybrid modeling approach that combined
results from separate environmental scattering and target scattering models.
This hybrid model produced synthetic sensor data where the
sensor/environment/target space could be modified to explore the expected
operating conditions. The simulated data were also used to adapt a set of
existing signal processing algorithms for formation of three-dimensional
acoustic imagery.
Recently, the sonar system has been integrated to a test platform, and
experiments have been conducted at a trial site in the Foster Joseph Sayers
Reservoir near Howard, PA. This test site has been prepared with several buried
man-made objects. Initial results show that fully buried targets can be
detected.
|
[{'version': 'v1', 'created': 'Sat, 22 Sep 2018 17:44:38 GMT'}
{'version': 'v2', 'created': 'Thu, 4 Oct 2018 11:27:16 GMT'}]
|
2018-10-05
|
[array(['Brown', 'Daniel C.', ''], dtype=object)
array(['Johnson', 'Shawn F.', ''], dtype=object)
array(['Brownstead', 'Cale F.', ''], dtype=object)]
|
7,309 |
2104.06880
|
Erik Burman
|
Erik Burman
|
Weighted error estimates for transient transport problems discretized
using continuous finite elements with interior penalty stabilization on the
gradient jumps
| null | null | null | null |
math.NA cs.NA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we consider the semi-discretization in space of a first order
scalar transport equation. For the space discretization we use standard
continuous finite elements. To obtain stability we add a penalty on the jump of
the gradient over element faces. We recall some global error estimates for
smooth and rough solutions and then prove a new local error estimate for the
transient linear transport equation. In particular we show that in the
stabilized method the effect of non-smooth features in the solution decay
exponentially from the space time zone where the solution is rough so that
smooth features will be transported unperturbed. Locally the $L^2$-norm error
converges with the expected order $O(h^{k+\frac12})$. We then illustrate the
results numerically. In particular we show the good local accuracy in the
smooth zone of the stabilized method and that the standard Galerkin fails to
approximate a solution that is smooth at the final time if discontinuities have
been present in the solution at some time during the evolution.
|
[{'version': 'v1', 'created': 'Wed, 14 Apr 2021 14:21:40 GMT'}
{'version': 'v2', 'created': 'Mon, 19 Apr 2021 14:48:39 GMT'}
{'version': 'v3', 'created': 'Thu, 16 Sep 2021 11:30:46 GMT'}]
|
2021-09-17
|
[array(['Burman', 'Erik', ''], dtype=object)]
|
7,310 |
2104.05651
|
Per Sebastian Skardal
|
Lluis Arola-Fernandez, Per Sebastian Skardal, and Alex Arenas
|
Geometric unfolding of synchronization dynamics on networks
| null | null |
10.1063/5.0053837
| null |
nlin.AO
|
http://creativecommons.org/licenses/by/4.0/
|
We study the synchronized state in a population of network-coupled,
heterogeneous oscillators. In particular, we show that the steady-state
solution of the linearized dynamics may be written as a geometric series whose
subsequent terms represent different spatial scales of the network. Namely,
each addition term incorporates contributions from wider network neighborhoods.
We prove that this geometric expansion converges for arbitrary frequency
distributions and for both undirected and directed networks provided that the
adjacency matrix is primitive. We also show that the error in the truncated
series grows geometrically with the second largest eigenvalue of the normalized
adjacency matrix, analogously to the rate of convergence to the stationary
distribution of a random walk. Lastly, we derive a local approximation for the
synchronized state by truncating the spatial series, at the first neighborhood
term, to illustrate the practical advantages of our approach.
|
[{'version': 'v1', 'created': 'Mon, 12 Apr 2021 17:21:17 GMT'}]
|
2021-06-30
|
[array(['Arola-Fernandez', 'Lluis', ''], dtype=object)
array(['Skardal', 'Per Sebastian', ''], dtype=object)
array(['Arenas', 'Alex', ''], dtype=object)]
|
7,311 |
cs/0701123
|
David Doty
|
David Doty and Philippe Moser
|
Feasible Depth
|
Accepted to Computation and Logic in the Real World, Proceedings of
the 3rd Conference on Computability in Europe (CiE), 2007
| null | null | null |
cs.CC cs.IT math.IT
| null |
This paper introduces two complexity-theoretic formulations of Bennett's
logical depth: finite-state depth and polynomial-time depth. It is shown that
for both formulations, trivial and random infinite sequences are shallow, and a
slow growth law holds, implying that deep sequences cannot be created easily
from shallow sequences. Furthermore, the E analogue of the halting language is
shown to be polynomial-time deep, by proving a more general result: every
language to which a nonnegligible subset of E can be reduced in uniform
exponential time is polynomial-time deep.
|
[{'version': 'v1', 'created': 'Fri, 19 Jan 2007 22:10:50 GMT'}
{'version': 'v2', 'created': 'Mon, 26 Feb 2007 05:54:54 GMT'}
{'version': 'v3', 'created': 'Wed, 11 Apr 2007 21:21:57 GMT'}]
|
2007-07-13
|
[array(['Doty', 'David', ''], dtype=object)
array(['Moser', 'Philippe', ''], dtype=object)]
|
7,312 |
1712.06045
|
Anatoly Kotikov Vassilievich
|
Bernd A. Kniehl, Anatoly V. Kotikov
|
SUSY-like relation in evolution of gluon and quark jet multiplicities
|
4 pages, talk given at the International Workshop "Supersymmetries
and Quantum Symmetries" (SQS'2017), July 31 - August 5, 2017 and the IVth
Russian-Spanish Congress "Particle, Nuclear, Astroparticle Physics and
Cosmology", September 4 - 8, 2017
| null |
10.1134/S1063779618050258
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show the new relationship [1] between the anomalous dimensions, resummed
through next-to-next-to-leading-logarithmic order, in the
Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) evolution equations for the
first Mellin moments D{q,g}(\mu2) of the quark and gluon fragmentation
functions, which correspond to the average hadron multiplicities in jets
initiated by quarks and gluons, respectively. This relationship, which is
independent of the number of quark flavors, strongly improves previous
treatments by allowing for an exact solution of the evolution equations. So
far, such relationships have only been known from supersymmetric QCD.
|
[{'version': 'v1', 'created': 'Sun, 17 Dec 2017 02:12:24 GMT'}
{'version': 'v2', 'created': 'Fri, 22 Dec 2017 09:37:20 GMT'}]
|
2018-11-14
|
[array(['Kniehl', 'Bernd A.', ''], dtype=object)
array(['Kotikov', 'Anatoly V.', ''], dtype=object)]
|
7,313 |
1208.1123
|
Joachim Kaldasch
|
Joachim Kaldasch
|
Evolutionary Model of the Growth and Size of Firms
| null | null |
10.1016/j.physa.2012.01.027
| null |
q-fin.GN stat.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The key idea of this model is that firms are the result of an evolutionary
process. Based on demand and supply considerations the evolutionary model
presented here derives explicitly Gibrat's law of proportionate effects as the
result of the competition between products. Applying a preferential attachment
mechanism for firms the theory allows to establish the size distribution of
products and firms. Also established are the growth rate and price distribution
of consumer goods. Taking into account the characteristic property of human
activities to occur in bursts, the model allows also an explanation of the
size-variance relationship of the growth rate distribution of products and
firms. Further the product life cycle, the learning (experience) curve and the
market size in terms of the mean number of firms that can survive in a market
are derived. The model also suggests the existence of an invariant of a market
as the ratio of total profit to total revenue. The relationship between a
neo-classic and an evolutionary view of a market is discussed. The comparison
with empirical investigations suggests that the theory is able to describe the
main stylized facts concerning the size and growth of firms.
|
[{'version': 'v1', 'created': 'Mon, 6 Aug 2012 09:28:08 GMT'}]
|
2015-06-11
|
[array(['Kaldasch', 'Joachim', ''], dtype=object)]
|
7,314 |
1810.03508
|
Cristina Acciarri
|
Cristina Acciarri, Andrea Lucchini
|
The generating graph of the abelian groups
| null | null | null | null |
math.GR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
For a group $G,$ let $\Gamma(G)$ denote the graph defined on the elements of
$G$ in such a way that two distinct vertices are connected by an edge if and
only if they generate $G$. Moreover let $\Gamma^*(G)$ be the subgraph of
$\Gamma(G)$ that is induced by all the vertices of $\Gamma(G)$ that are not
isolated. We prove that if $G$ is a 2-generated non-cyclic abelian group then
$\Gamma^*(G)$ is connected. Moreover $\mathrm{diam}(\Gamma^*(G))=2$ if the
torsion subgroup of $G$ is non-trivial and $\mathrm{diam}(\Gamma^*(G))=\infty$
otherwise. If $F$ is the free group of rank 2, then $\Gamma^*(F)$ is connected
and we deduce from $\mathrm{diam}(\Gamma^*(\mathbb{Z}\times
\mathbb{Z}))=\infty$ that $\mathrm{diam}(\Gamma^*(F))=\infty.$
|
[{'version': 'v1', 'created': 'Mon, 8 Oct 2018 14:52:23 GMT'}]
|
2018-10-09
|
[array(['Acciarri', 'Cristina', ''], dtype=object)
array(['Lucchini', 'Andrea', ''], dtype=object)]
|
7,315 |
astro-ph/9308042
| null |
Luca Zampieri, Roberto Turolla and Aldo Treves
|
Dynamically Comptonized Spectra from Near Critical Accretion onto
Neutron Stars
|
18 pages (figures available on request), TeX, Ref. SISSA 96/93/A
|
Astrophys.J. 419 (1993) 311
|
10.1086/173485
| null |
astro-ph
| null |
We investigate the effects of dynamical Comptonization on the emergent
radiation spectrum produced by near critical accretion onto a neutron star. The
flow dynamics and the transfer of radiation are self--consistently solved in
the case of a spherically symmetric, ``cold'', pure scattering flow, including
general relativity. A sequence of models, each characterized by the value of
the total observed luminosity, was obtained assuming that the spectrum at the
star surface is black body in shape. It is found that when the luminosity
approaches the Eddington limit dynamical effects become important shifting the
spectrum to the blue and producing a power--law, high--energy tail. The
relevance of these results in connection with the observed spectral properties
of LMXBs, and of Cyg X--2 in particular, are discussed.
|
[{'version': 'v1', 'created': 'Fri, 27 Aug 1993 17:52:01 GMT'}]
|
2009-10-22
|
[array(['Zampieri', 'Luca', ''], dtype=object)
array(['Turolla', 'Roberto', ''], dtype=object)
array(['Treves', 'Aldo', ''], dtype=object)]
|
7,316 |
1810.13037
|
Bruce Hrivnak
|
Bruce J. Hrivnak, Griet Van de Steene, Hans Van Winckel, Wenxian Lu,
and Julius Sperauskas
|
Variability in Proto-Planetary Nebulae: V. Velocity and Light Curve
Analyses of IRAS 17436+5003, 18095+2704, and 19475+3119
|
Accepted for publication in Astron. J.: 33 pages, 12 figures
| null | null | null |
astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We have obtained contemporaneous light, color, and radial velocity data for
three proto-planetary nebulae (PPNe) over the years 2007 to 2015. The light and
velocity curves of each show similar periods of pulsation, with photometric
periods of 42 and 50 days for IRAS 17436+5003, 102 days for IRAS 18095+2704,
and 35 days for IRAS 19475+3119. The light and velocity curves are complex with
multiple periods and small, variable amplitudes. Nevertheless, at least over
limited time intervals, we were able to identify dominant periods in the light,
color, and velocity curves and compare the phasing of each. The color curves
appear to peak with or slightly after the light curves while the radial
velocity curves peak about a quarter of a cycle before the light curves.
Similar results were found previously for two other PPNe, although for them the
light and color appeared to be in phase. Thus it appears that PPNe are
brightest when smallest and hottest. These phase results differ from those
found for classical Cepheid variables, where the light and velocity differ by
half a cycle, and are hottest at about average size and expanding. However,
they do appear to have similar phasing to the larger amplitude pulsations seen
in RV Tauri variables. Presently, few pulsation models exist for PPNe, and
these do not fit the observations well, especially the longer periods observed.
Model fits to these new light and velocity curves would allow masses to be
determined for these post-AGB objects, and thereby provide important
constraints to post-AGB stellar evolution models of low and intermediate-mass
stars.
|
[{'version': 'v1', 'created': 'Tue, 30 Oct 2018 23:48:26 GMT'}]
|
2018-11-01
|
[array(['Hrivnak', 'Bruce J.', ''], dtype=object)
array(['Van de Steene', 'Griet', ''], dtype=object)
array(['Van Winckel', 'Hans', ''], dtype=object)
array(['Lu', 'Wenxian', ''], dtype=object)
array(['Sperauskas', 'Julius', ''], dtype=object)]
|
7,317 |
1212.3492
|
Herbert Hamber
|
Herbert W. Hamber, Reiko Toriumi and Ruth M. Williams
|
Wheeler-DeWitt Equation in 3 + 1 Dimensions
|
44 pages, 5 figures. arXiv admin note: text overlap with
arXiv:1207.3759
| null |
10.1103/PhysRevD.88.084012
| null |
hep-th gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Physical properties of the quantum gravitational vacuum state are explored by
solving a lattice version of the Wheeler-DeWitt equation. The constraint of
diffeomorphism invariance is strong enough to uniquely determine the structure
of the vacuum wave functional in the limit of infinitely fine triangulations of
the three-sphere. In the large fluctuation regime the nature of the wave
function solution is such that a physically acceptable ground state emerges,
with a finite non-perturbative correlation length naturally cutting off any
infrared divergences. The location of the critical point in Newton's constant
$G_c$, separating the weak from the strong coupling phase, is obtained, and it
is inferred from the structure of the wave functional that fluctuations in the
curvatures become unbounded at this point. Investigations of the vacuum wave
functional further suggest that for weak enough coupling, $G<G_c$, a
pathological ground state with no continuum limit appears, where configurations
with small curvature have vanishingly small probability. One is then lead to
the conclusion that the weak coupling, perturbative ground state of quantum
gravity is non-perturbatively unstable, and that gravitational screening cannot
be physically realized in the lattice theory. The results we find are in
general agreement with the Euclidean lattice gravity results, and lend further
support to the claim that the Lorentzian and Euclidean lattice formulations for
gravity describe the same underlying non-perturbative physics.
|
[{'version': 'v1', 'created': 'Fri, 14 Dec 2012 14:51:15 GMT'}
{'version': 'v2', 'created': 'Fri, 4 Jan 2013 13:27:40 GMT'}
{'version': 'v3', 'created': 'Fri, 12 Jul 2013 18:01:00 GMT'}]
|
2015-06-12
|
[array(['Hamber', 'Herbert W.', ''], dtype=object)
array(['Toriumi', 'Reiko', ''], dtype=object)
array(['Williams', 'Ruth M.', ''], dtype=object)]
|
7,318 |
math/0409177
|
Zhaoyong Huang
|
Zhaoyong Huang
|
$k$-Gorenstein Modules
|
18 pages. The statement of Lemma 3.2 is strengthened and the
corresponding proof is changed. To appear in Acta Mathematica Sinica (English
Series)
| null | null | null |
math.RA math.RT
| null |
Let $\Lambda$ and $\Gamma$ be artin algebras and $_{\Lambda}U_{\Gamma}$ a
faithfully balanced selforthogonal bimodule. In this paper, we first introduce
the notion of $k$-Gorenstein modules with respect to $_{\Lambda}U_{\Gamma}$ and
then characterize it in terms of the $U$-resolution dimension of some special
injective modules and the property of the functors ${\rm Ext}^{i}({\rm
Ext}^{i}(-, U), U)$ preserving monomorphisms, which develops a classical result
of Auslander. As an application, we study the properties of dual modules
relative to Gorenstein bimodules. In addition, we give some properties of
$_{\Lambda}U_{\Gamma}$ with finite left or right injective dimension.
|
[{'version': 'v1', 'created': 'Fri, 10 Sep 2004 06:59:49 GMT'}
{'version': 'v2', 'created': 'Wed, 7 Sep 2005 02:28:41 GMT'}]
|
2007-05-23
|
[array(['Huang', 'Zhaoyong', ''], dtype=object)]
|
7,319 |
1806.07174
|
Farshid Rayhan
|
Farshid Rayhan, Sajid Ahmed, Zaynab Mousavian, Dewan Md Farid,
Swakkhar Shatabda
|
FRnet-DTI: Deep Convolutional Neural Networks with Evolutionary and
Structural Features for Drug-Target Interaction
| null |
2019
|
10.1016/j.heliyon.2020.e03444
| null |
cs.LG stat.ML
|
http://creativecommons.org/publicdomain/zero/1.0/
|
The task of drug-target interaction prediction holds significant importance
in pharmacology and therapeutic drug design. In this paper, we present
FRnet-DTI, an auto encoder and a convolutional classifier for feature
manipulation and drug target interaction prediction. Two convolutional neural
neworks are proposed where one model is used for feature manipulation and the
other one for classification. Using the first method FRnet-1, we generate 4096
features for each of the instances in each of the datasets and use the second
method, FRnet-2, to identify interaction probability employing those features.
We have tested our method on four gold standard datasets exhaustively used by
other researchers. Experimental results shows that our method significantly
improves over the state-of-the-art method on three of the four drug-target
interaction gold standard datasets on both area under curve for Receiver
Operating Characteristic(auROC) and area under Precision Recall curve(auPR)
metric. We also introduce twenty new potential drug-target pairs for
interaction based on high prediction scores. Codes Available: https: // github.
com/ farshidrayhanuiu/ FRnet-DTI/ Web Implementation: http: // farshidrayhan.
pythonanywhere. com/ FRnet-DTI/
|
[{'version': 'v1', 'created': 'Tue, 19 Jun 2018 12:01:57 GMT'}
{'version': 'v2', 'created': 'Fri, 22 Jun 2018 09:14:56 GMT'}
{'version': 'v3', 'created': 'Fri, 31 Aug 2018 08:25:11 GMT'}]
|
2020-05-26
|
[array(['Rayhan', 'Farshid', ''], dtype=object)
array(['Ahmed', 'Sajid', ''], dtype=object)
array(['Mousavian', 'Zaynab', ''], dtype=object)
array(['Farid', 'Dewan Md', ''], dtype=object)
array(['Shatabda', 'Swakkhar', ''], dtype=object)]
|
7,320 |
2005.03206
|
Amy Lovell
|
A.E. Lovell, P. Talou, I. Stetcu, and K.J. Kelly
|
Correlations Between Fission Fragment and Neutron Anisotropies in
Neutron-Induced Fission
|
10 pages, 7 figures, submitted to Phys. Rev. C
|
Phys. Rev. C 102, 024621 (2020)
|
10.1103/PhysRevC.102.024621
|
LA-UR-20-22603
|
nucl-th nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Several sources of angular anisotropy for fission fragments and prompt
neutrons have been studied in neutron-induced fission reactions. These include
kinematic recoils of the target from the incident neutron beam and the
fragments from the emission of the prompt neutrons, preferential directions of
the emission of the fission fragments with respect to the beam axis due to the
population of particular transition states at the fission barrier, and
forward-peaked angular distributions of pre-equilibrium neutrons which are
emitted before the formation of a compound nucleus. In addition, there are
several potential sources of angular anisotropies that are more difficult to
disentangle: the angular distributions of prompt neutrons from fully
accelerated fragments or from scission neutrons, and the emission of neutrons
from fission fragments that are not fully accelerated. In this work, we study
the effects of the first group of anisotropy sources, particularly exploring
the correlations between the fission fragment anisotropy and the resulting
neutron anisotropy. While kinematic effects were already accounted for in our
Hauser-Feshbach Monte Carlo code, $\mathtt{CGMF}$, anisotropic angular
distributions for the fission fragments and pre-equilibrium neutrons resulting
from neutron-induced fission on $^{233,234,235,238}$U, $^{239,241}$Pu, and
$^{237}$Np have been introduced for the first time. The effects of these
sources of anisotropy are examined over a range of incident neutron energies,
from thermal to 20 MeV, and compared to experimental data from the Chi-Nu
liquid scintillator array. The anisotropy of the fission fragments is reflected
in the anisotropy of the prompt neutrons, especially as the outgoing energy of
the prompt neutrons increases, allowing for an extraction of the fission
fragment anisotropy to be made from a measurement of the neutrons.
|
[{'version': 'v1', 'created': 'Thu, 7 May 2020 02:14:54 GMT'}]
|
2020-09-02
|
[array(['Lovell', 'A. E.', ''], dtype=object)
array(['Talou', 'P.', ''], dtype=object)
array(['Stetcu', 'I.', ''], dtype=object)
array(['Kelly', 'K. J.', ''], dtype=object)]
|
7,321 |
1706.05150
|
He-Da Wang
|
He-Da Wang, Teng Zhang, Ji Wu
|
The Monkeytyping Solution to the YouTube-8M Video Understanding
Challenge
|
Submitted to the CVPR 2017 Workshop on YouTube-8M Large-Scale Video
Understanding
| null | null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This article describes the final solution of team monkeytyping, who finished
in second place in the YouTube-8M video understanding challenge. The dataset
used in this challenge is a large-scale benchmark for multi-label video
classification. We extend the work in [1] and propose several improvements for
frame sequence modeling. We propose a network structure called Chaining that
can better capture the interactions between labels. Also, we report our
approaches in dealing with multi-scale information and attention pooling. In
addition, We find that using the output of model ensemble as a side target in
training can boost single model performance. We report our experiments in
bagging, boosting, cascade, and stacking, and propose a stacking algorithm
called attention weighted stacking. Our final submission is an ensemble that
consists of 74 sub models, all of which are listed in the appendix.
|
[{'version': 'v1', 'created': 'Fri, 16 Jun 2017 05:39:53 GMT'}]
|
2017-06-19
|
[array(['Wang', 'He-Da', ''], dtype=object)
array(['Zhang', 'Teng', ''], dtype=object)
array(['Wu', 'Ji', ''], dtype=object)]
|
7,322 |
2306.15805
|
Martin Dieguez
|
Juan Pablo Aguilera and Mart\'in Di\'eguez and David Fern\'andez-Duque
and Brett McLean
|
G\"odel-Dummett linear temporal logic
|
arXiv admin note: substantial text overlap with arXiv:2205.00574,
arXiv:2205.05182
| null | null | null |
cs.LO cs.AI cs.CC
|
http://creativecommons.org/licenses/by/4.0/
|
We investigate a version of linear temporal logic whose propositional
fragment is G\"odel-Dummett logic (which is well known both as a
superintuitionistic logic and a t-norm fuzzy logic). We define the logic using
two natural semantics: first a real-valued semantics, where statements have a
degree of truth in the real unit interval and second a `bi-relational'
semantics. We then show that these two semantics indeed define one and the same
logic: the statements that are valid for the real-valued semantics are the same
as those that are valid for the bi-relational semantics. This G\"odel temporal
logic does not have any form of the finite model property for these two
semantics: there are non-valid statements that can only be falsified on an
infinite model. However, by using the technical notion of a quasimodel, we show
that every falsifiable statement is falsifiable on a finite quasimodel,
yielding an algorithm for deciding if a statement is valid or not. Later, we
strengthen this decidability result by giving an algorithm that uses only a
polynomial amount of memory, proving that G\"odel temporal logic is
PSPACE-complete. We also provide a deductive calculus for G\"odel temporal
logic, and show this calculus to be sound and complete for the above-mentioned
semantics, so that all (and only) the valid statements can be proved with this
calculus.
|
[{'version': 'v1', 'created': 'Tue, 27 Jun 2023 21:19:52 GMT'}]
|
2023-06-29
|
[array(['Aguilera', 'Juan Pablo', ''], dtype=object)
array(['Diéguez', 'Martín', ''], dtype=object)
array(['Fernández-Duque', 'David', ''], dtype=object)
array(['McLean', 'Brett', ''], dtype=object)]
|
7,323 |
hep-th/9707189
|
Denny Fliegner
|
D. Fliegner (Heidelberg U., ITP), P. Haberl (RWTH Aachen, ITP), M.G.
Schmidt (Heidelberg U., ITP), C. Schubert (Humboldt U. Berlin)
|
The Higher Derivative Expansion of the Effective Action by the String
Inspired Method. Part II
|
37 pages, LaTeX, 3 figures, typos corrected, to appear in Ann. Phys.
(N.Y.)
|
Annals Phys. 264 (1998) 51-74
|
10.1006/aphy.1997.5778
|
HD-THEP-97/24, HUB-EP-97/42
|
hep-th
| null |
We apply the string inspired worldline formalism to the calculation of the
higher derivative expansion of one-loop effective actions in non-Abelian gauge
theory. For this purpose, we have completely computerized the method, using the
symbolic manipulation programs FORM, PERL and M. Explicit results are given to
sixth order in the inverse mass expansion, reduced to a minimal basis of
invariants specifically adapted to the method. Detailed comparisons are made
with other gauge-invariant algorithms for calculating the same expansion. This
includes an explicit check of all coefficients up to fifth order.
|
[{'version': 'v1', 'created': 'Tue, 22 Jul 1997 21:09:27 GMT'}
{'version': 'v2', 'created': 'Wed, 11 Mar 1998 09:10:55 GMT'}]
|
2009-10-30
|
[array(['Fliegner', 'D.', '', 'Heidelberg U., ITP'], dtype=object)
array(['Haberl', 'P.', '', 'RWTH Aachen, ITP'], dtype=object)
array(['Schmidt', 'M. G.', '', 'Heidelberg U., ITP'], dtype=object)
array(['Schubert', 'C.', '', 'Humboldt U. Berlin'], dtype=object)]
|
7,324 |
1503.03544
|
Jae Sung Lee
|
Joong Hyun Kim, Mikiko Ito, Soo Mee Kim, Seong Jong Hong, Jae Sung Lee
|
Design Optimization of a Small-animal SPECT System Using LGSO Continuous
Crystal and a Micro Parallel-hole Collimator
|
19 pages of text, 2 tables, and 7 figures
| null | null | null |
physics.med-ph physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The aim of this study was to optimize the design of a monolithic LGSO
scintillation crystal and micro parallel-hole collimator for the development of
a small-animal single photon emission computed tomography (SPECT) system with
compact size, low-cost and reasonable performance through Monte Carlo
simulation. L0.9GSO crystals with surface area of 50 mm X 50 mm were
investigated for the design optimization. The intrinsic detection efficiency,
intrinsic spatial resolution, and intrinsic energy resolution of crystals were
estimated for different crystal thicknesses and photon energies (using I-125
and Tc-99m sources). Two kinds of surface treatments (providing polished and
rough surfaces) were compared by optical photon simulation. The standard
deviation of the angle between a micro-facet and the mean surface was set to
0.1 and 6.0 for polished and rough surfaces, respectively. For comparison, the
intrinsic performance of NaI(Tl) was also investigated. A multi-photomultiplier
tube was designed with 16 X 16 anode pixels having size of 2.8 mm X 2.8 mm and
pitch of 3.04 mm, and a 1.5 mm thickness glass window. The length of the micro
collimator was also optimized. Finally, the performance of the SPECT system was
assessed and an ultra-micro hot spot phantom image was obtained in simulation.
The 1-mm-thick LGSO was sufficient to detect most incident photons from I-125
but a thickness of 3 mm was required for Tc-99m imaging. Polished crystal
yielded better intrinsic spatial resolution (~540 {\mu}m) and lower light
output than rough crystal. Energy resolutions of I-125 and Tc-99m were ~36.9%
and ~19.1%. With the optimized collimator length, spatial resolution of ~1 mm
and sensitivity of ~100 cps/MBq were achieved with a four-head SPECT system. A
hot rod with a diameter of 1.0 mm was resolved in the SPECT image of
ultra-micro hot spot phantom.
|
[{'version': 'v1', 'created': 'Thu, 12 Mar 2015 01:05:39 GMT'}]
|
2015-03-13
|
[array(['Kim', 'Joong Hyun', ''], dtype=object)
array(['Ito', 'Mikiko', ''], dtype=object)
array(['Kim', 'Soo Mee', ''], dtype=object)
array(['Hong', 'Seong Jong', ''], dtype=object)
array(['Lee', 'Jae Sung', ''], dtype=object)]
|
7,325 |
1703.07866
|
Yiftach Barnea
|
Yiftach Barnea and Jan-Christoph Schlage-Puchta
|
Large normal subgroup growth and large characteristic subgroup growth
| null | null | null | null |
math.GR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The maximal normal subgroup growth type of a finitely generated group is
$n^{\log n}$. Very little is known about groups with this type of growth. In
particular, the following is a long standing problem: Let $\Gamma$ be a group
and $\Delta$ a subgroup of finite index. Suppose $\Delta$ has normal subgroup
growth of type $n^{\log n}$, does $\Gamma$ has normal subgroup growth of type
$n^{\log n}$? We give a positive answer in some cases, generalizing a result of
M\"uller and the second author and a result of Gerdau. For instance, suppose
$G$ is a profinite group and $H$ an open subgroup of $G$. We show that if $H$
is a generalized Golod-Shafarevich group, then $G$ has normal subgroup growth
of type of $n^{\log n}$. We also use our methods to show that one can find a
group with characteristic subgroup growth of type $n^{\log n}$.
|
[{'version': 'v1', 'created': 'Wed, 22 Mar 2017 21:39:20 GMT'}
{'version': 'v2', 'created': 'Mon, 17 Jun 2019 10:12:48 GMT'}]
|
2019-06-18
|
[array(['Barnea', 'Yiftach', ''], dtype=object)
array(['Schlage-Puchta', 'Jan-Christoph', ''], dtype=object)]
|
7,326 |
2007.00868
|
Daniel Gonzalez
|
Daniel J. Gonzalez and H. Harry Asada
|
Design and Analysis of 6-DOF Triple Scissor Extender Robots with
Applications in Aircraft Assembly
| null |
in IEEE Robotics and Automation Letters, vol. 2, no. 3, pp.
1420-1427, July 2017
|
10.1109/LRA.2017.2671366
| null |
cs.RO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A new type of parallel robot mechanism with an extendable structure is
presented, and its kinematic properties and design parameters are analyzed. The
Triple Scissor Extender (TSE) is a 6 Degree-Of-Freedom robotic mechanism for
reaching high ceilings and positioning an end effector. Three scissor
mechanisms are arranged in parallel, with the bottom ends coupled to linear
slides, and the top vertex attached to an end effector plate. Arbitrary
positions and orientations of the end effector can be achieved through the
coordinated motion of the six linear actuators located at the base. By changing
key geometric parameters, the TSE's design can yield a specific desired
workspace volume and differential motion behavior. A general kinematic model
for diverse TSEs is derived, and the kinematic properties, including workspace,
singularity, and the Jacobian singular values, are evaluated. From these
expressions, four key design parameters are identified, and their sensitivity
upon the workspace volume and the Jacobian singular values is analyzed. A case
study in autonomous aircraft assembly is presented using the insights gained
from the design parameter studies.
|
[{'version': 'v1', 'created': 'Thu, 2 Jul 2020 04:30:45 GMT'}]
|
2020-07-03
|
[array(['Gonzalez', 'Daniel J.', ''], dtype=object)
array(['Asada', 'H. Harry', ''], dtype=object)]
|
7,327 |
2112.06676
|
Shin-Ichiro Iai
|
Shiro Goto and Shin-ichiro Iai
|
Gorensteinness in Rees algebras of powers of parameter ideals
|
29 pages
| null | null | null |
math.AC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper gives a necessary and sufficient condition for Gorensteinness in
Rees algebras of the $d$-th power of parameter ideals in certain Noetherian
local rings of dimension $d\ge 2$. The main result of this paper produces many
Gorenstein Rees algebras over non-Cohen-Macaulay local rings. For example, the
Rees algebra $\mathcal{R}(\mathfrak{q}^d)=\oplus_{i\ge 0}\mathfrak{q}^{di}$ is
Gorenstein for every parameter ideal $\mathfrak{q}$ that is a reduction of the
maximal ideal in a $d$-dimensional Buchsbaum local ring of depth 1 and
multiplicity 2.
|
[{'version': 'v1', 'created': 'Mon, 13 Dec 2021 13:52:45 GMT'}
{'version': 'v2', 'created': 'Sun, 27 Nov 2022 16:45:28 GMT'}]
|
2022-11-29
|
[array(['Goto', 'Shiro', ''], dtype=object)
array(['Iai', 'Shin-ichiro', ''], dtype=object)]
|
7,328 |
1908.10683
|
Claudio Hail
|
Claudio U. Hail, Gabriel Schnoering, Mehdi Damak, Dimos Poulikakos,
Hadi Eghlidi
|
A plasmonic painter's method of color mixing for a continuous RGB
palette
|
33 pages, 15 figures
|
ACS Nano 14 (2020) 1783-1791
|
10.1021/acsnano.9b07523
| null |
physics.optics
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The ability of mixing colors with remarkable results had long been exclusive
to the talents of master painters. By finely combining colors at different
amounts on the palette intuitively, they obtain smooth gradients with any given
color. Creating such smooth color variations through scattering by the
structural patterning of a surface, as opposed to color pigments, has long
remained a challenge. Here, we borrow from the painter's approach and
demonstrate color mixing generated by an optical metasurface. We propose a
single-layer plasmonic color pixel and a method for nanophotonic structural
color mixing based on the additive RGB color model. The color pixels consist of
plasmonic nanorod arrays that generate vivid primary colors and enable
independent control of color brightness without affecting chromaticity, by
simply varying geometric in-plane parameters. By interleaving different nanorod
arrays, we combine up to three primary colors on a single pixel. Based on this,
two and three color mixing is demonstrated, enabling the continuous coverage of
a plasmonic RGB color gamut and yielding a palette with a virtually unlimited
number of colors. With this multi-resonant color pixel, we show the
photorealistic printing of color and monochrome images at the nanoscale, with
ultra-smooth transitions in color and brightness. Our color mixing approach can
be applied to a broad range of scatterer designs and materials, and has the
potential to be used for multi-wavelength color filters and dynamic
photorealistic displays.
|
[{'version': 'v1', 'created': 'Tue, 27 Aug 2019 11:41:46 GMT'}]
|
2020-04-10
|
[array(['Hail', 'Claudio U.', ''], dtype=object)
array(['Schnoering', 'Gabriel', ''], dtype=object)
array(['Damak', 'Mehdi', ''], dtype=object)
array(['Poulikakos', 'Dimos', ''], dtype=object)
array(['Eghlidi', 'Hadi', ''], dtype=object)]
|
7,329 |
1912.00599
|
Tan Zhang
|
Tan Zhang, Zhihai Cui, Zhijun Wang, Hongming Weng, Zhong Fang
|
BaHgSn: A Dirac semimetal with surface hourglass fermions
| null |
Phys. Rev. B 101, 115145 (2020)
|
10.1103/PhysRevB.101.115145
| null |
cond-mat.mtrl-sci cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We proposed that BaHgSn is a Dirac semimetal (DSM) which can host
hourglass-like surface states (HSSs) as protected by nonsymmorphic glide
symmetry. Compared to KHgSb, an isostructural topological crystalline insulator
with the same HSSs, BaHgSn has an additional band inversion at $\Gamma$ point.
This band inversion is induced by the stronger interlayer coupling among Hg-Sn
honeycomb layers than that among Hg-Sb-layers in KHgSb, which leads to bulk
Dirac nodes in BaHgSn along the layer stacking direction $\Gamma$-$A$. In
addition, the mirror Chern number $C_{i}$ protected by the mirror plane
$\overline{M}_{z}$ ($k_z$=0) changes from 2 in KHgSb to 3 in BaHgSn. Therefore,
when a compressive uniaxial strain is applied along the $y$ axis to break the
rotation symmetry protecting the DSM state, BaHgSn becomes a strong topological
insulator with $Z_{2}$ indices of $(1;000)$ and the topological surface Dirac
cone co-exists with HSSs on the (010) surface. The Wilson-loop spectra have
been calculated to verify these topological features. The calculated surface
states, the Fermi surfaces and their quasiparticle interference patterns are
ready to be compared with experimental measurements.
|
[{'version': 'v1', 'created': 'Mon, 2 Dec 2019 07:08:36 GMT'}
{'version': 'v2', 'created': 'Fri, 13 Mar 2020 06:34:49 GMT'}]
|
2020-04-08
|
[array(['Zhang', 'Tan', ''], dtype=object)
array(['Cui', 'Zhihai', ''], dtype=object)
array(['Wang', 'Zhijun', ''], dtype=object)
array(['Weng', 'Hongming', ''], dtype=object)
array(['Fang', 'Zhong', ''], dtype=object)]
|
7,330 |
hep-th/0309174
|
Jacek Wosiek
|
J. Wosiek (M. Smoluchowski Institute of Physics, Jagellonian
University, Krakow)
|
Recent progress in supersymmetric Yang-Mills quantum mechanics in
various dimensions
|
19 pages, 4 figures, presented at the Workshop on Random Geometry,
Krakow, May 15 - 17, 2003
|
Acta Phys.Polon. B34 (2003) 5103-5118
| null |
TPJU-6/2003, MPP-2003-72
|
hep-th
| null |
We review the last year progress in understanding supersymmetric SU(2)
Yang-Mills quantum mechanics in four and ten space-time dimensions. The four
dimensional system is now well under control and the precise spectrum is
obtained in all channels. In D=10 some new results are also available.
|
[{'version': 'v1', 'created': 'Wed, 17 Sep 2003 11:31:27 GMT'}]
|
2007-05-23
|
[array(['Wosiek', 'J.', '',
'M. Smoluchowski Institute of Physics, Jagellonian\n University, Krakow'],
dtype=object) ]
|
7,331 |
1605.03275
|
Florentin Smarandache
|
Ion Patrascu, Florentin Smarandache
|
Complements to Classic Topics of Circles Geometry
|
180 pages; many geometrical figures
|
Pons Editions, Brussels, 2016
| null | null |
math.GM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We approach several themes of classical geometry of the circle and complete
them with some original results, showing that not everything in traditional
math is revealed, and that it still has an open character. The topics were
chosen according to authors aspiration and attraction, as a poet writes lyrics
about spring according to his emotions.
|
[{'version': 'v1', 'created': 'Wed, 11 May 2016 04:38:45 GMT'}]
|
2016-05-12
|
[array(['Patrascu', 'Ion', ''], dtype=object)
array(['Smarandache', 'Florentin', ''], dtype=object)]
|
7,332 |
1812.03672
|
Yoann Tarricq
|
F. Durret, Y. Tarricq, I. M\'arquez, H. Ashkar, C. Adami
|
The link between brightest cluster galaxy properties and large scale
extensions of 38 DAFT/FADA and CLASH clusters in the redshift range 0.2<z<0.9
|
13 pages, 7 figures, Accepted for publication in A&A
|
A&A 622, A78 (2019)
|
10.1051/0004-6361/201834374
| null |
astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the context of large scale structure formation, clusters of galaxies are
located at the nodes of the cosmic web, and continue to accrete galaxies and
groups along filaments. They show sometimes a very large extension and a
preferential direction. Brightest cluster galaxies (BCGs) are believed to grow
through the accretion of many small galaxies, and their structural properties
are expected to vary with redshift. In some cases BCGs show an orientation
comparable to that of the cluster to which they belong. We analyse the
morphological properties of 38 BCGs from the DAFT/FADA and CLASH surveys and
compare the position angles of their major axes to the direction of the cluster
elongation at Mpc scale. The morphological properties of the BCGs were studied
by applying the GALFIT software to HST images and fitting the light
distribution with one or two Sersic laws, or with a Nuker plus a Sersic law.
The cluster elongations were estimated by computing density maps of red
sequence galaxies. The analysis of the 38 BCGs shows that in 11 cases a single
Sersic law is sufficient to account for the surface brightness, while for all
the other clusters two laws are necessary. For the outer Sersic component, the
effective radius increases with decreasing redshift, and the effective surface
brightness decreases with effective radius, following the Kormendy law. An
agreement between the major axis of the BCG and the cluster elongation at large
scale within +-30 deg is found for 12 clusters out of the 21 for which both PAs
can be defined. The variation with redshift of the effective radius of the
outer Sersic component agrees with the growing of BCGs by accretion of smaller
galaxies from z=0.9 to 0.2. The directions of the elongations of BCGs and of
their host clusters and large scale structures agree for 12 objects out of 21,
implying that a larger sample is necessary to reach more definite conclusions.
|
[{'version': 'v1', 'created': 'Mon, 10 Dec 2018 08:42:49 GMT'}
{'version': 'v2', 'created': 'Tue, 18 Dec 2018 21:43:21 GMT'}]
|
2019-02-06
|
[array(['Durret', 'F.', ''], dtype=object)
array(['Tarricq', 'Y.', ''], dtype=object)
array(['Márquez', 'I.', ''], dtype=object)
array(['Ashkar', 'H.', ''], dtype=object)
array(['Adami', 'C.', ''], dtype=object)]
|
7,333 |
1506.04927
|
Marco Baity-Jesi
|
Marco Baity-Jesi, Victor Martin-Mayor, Giorgio Parisi and Sergio
Perez-Gaviro
|
Soft Modes, Localization and Two-Level Systems in Spin Glasses
|
13 pages, 14 figures. Version accepted for publication in Phys. Rev.
Lett
|
Phys. Rev. Lett. 115, 267205 (2015)
|
10.1103/PhysRevLett.115.267205
| null |
cond-mat.dis-nn cond-mat.soft
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the three-dimensional Heisenberg spin glass in a random field we study the
properties of the inherent structures that are obtained by an instantaneous
cooling from infinite temperature. For not too large field the density of
states $g(\omega)$ develops localized soft {\em plastic} modes and reaches zero
as $\omega^4$ (for large fiels a gap appears). When we perturb the system
adding a force along the softest mode one reaches very similar minima of the
energy, separated by small barriers, that appear to be good candidates for
classical two-level systems.
|
[{'version': 'v1', 'created': 'Tue, 16 Jun 2015 11:44:51 GMT'}
{'version': 'v2', 'created': 'Mon, 30 Nov 2015 16:32:06 GMT'}]
|
2015-12-29
|
[array(['Baity-Jesi', 'Marco', ''], dtype=object)
array(['Martin-Mayor', 'Victor', ''], dtype=object)
array(['Parisi', 'Giorgio', ''], dtype=object)
array(['Perez-Gaviro', 'Sergio', ''], dtype=object)]
|
7,334 |
1410.6296
|
Arnold Janssen Prof. Dr.
|
Philipp Heesen, Arnold Janssen
|
Dynamic adaptive multiple tests with finite sample FDR control
|
20 pages
| null | null | null |
math.ST stat.TH
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The present paper introduces new adaptive multiple tests which rely on the
estimation of the number of true null hypotheses and which control the false
discovery rate (FDR) at level alpha for finite sample size. We derive exact
formulas for the FDR for a large class of adaptive multiple tests which apply
to a new class of testing procedures. In the following, generalized Storey
estimators and weighted versions are introduced and it turns out that the
corresponding adaptive step up and step down tests control the FDR. The present
results also include particular dynamic adaptive step wise tests which use a
data dependent weighting of the new generalized Storey estimators. In addition,
a converse of the Benjamini Hochberg (1995) theorem is given. The Benjamini
Hochberg (1995) test is the only "distribution free" step up test with FDR
independent of the distribution of the p-values of false null hypotheses.
|
[{'version': 'v1', 'created': 'Thu, 23 Oct 2014 09:07:11 GMT'}]
|
2014-10-24
|
[array(['Heesen', 'Philipp', ''], dtype=object)
array(['Janssen', 'Arnold', ''], dtype=object)]
|
7,335 |
1912.01390
|
Yudai Seino
|
Y. Seino, T. Inada, T. Yamazaki, T. Namba, S. Asai
|
New Estimation of the Curvature Effect for the X-ray Vacuum Diffraction
Induced by an Intense Laser Field
|
8 pages, 3 figures
|
Prog Theor Exp Phys (2020)
|
10.1093/ptep/ptaa084
| null |
hep-ph hep-ex physics.optics
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Quantum electrodynamics predicts x-ray diffractions under a high-intensity
laser field via virtual charged particles, and this phenomenon is called as
vacuum diffraction (VD). In this paper, we derive a new formula to describe VD
in a head-on collision geometry of an XFEL pulse and a laser pulse. A wavefront
curvature of the XFEL pulse is newly considered in this formula. With this
formula, we also discuss the curvature effect on VD signals based on realistic
parameters at SACLA XFEL facility.
|
[{'version': 'v1', 'created': 'Thu, 28 Nov 2019 08:11:29 GMT'}]
|
2020-07-29
|
[array(['Seino', 'Y.', ''], dtype=object)
array(['Inada', 'T.', ''], dtype=object)
array(['Yamazaki', 'T.', ''], dtype=object)
array(['Namba', 'T.', ''], dtype=object)
array(['Asai', 'S.', ''], dtype=object)]
|
7,336 |
1606.06253
|
Daniel J. Thompson
|
David Constantine, Jean-Fran\c{c}ois Lafont, Daniel J. Thompson
|
The weak specification property for geodesic flows on CAT(-1) spaces
|
30 pages, 2 figures. v5: minor corrections. To appear in Groups,
Geometry and Dynamics
|
Groups Geom. Dyn. 14 (2020), pgs. 297-336
| null | null |
math.DS math.MG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We prove that the geodesic flow on a compact locally CAT(-1) space has the
weak specification property, and give various applications. We show that every
H\"older potential on the space of geodesics has a unique equilibrium state. We
establish the equidistribution of weighted periodic orbits and the large
deviations principle for all such measures. The thermodynamic results are
proved for the class of expansive flows with weak specification.
|
[{'version': 'v1', 'created': 'Mon, 20 Jun 2016 19:06:33 GMT'}
{'version': 'v2', 'created': 'Thu, 27 Jul 2017 21:43:40 GMT'}
{'version': 'v3', 'created': 'Thu, 8 Mar 2018 02:02:49 GMT'}
{'version': 'v4', 'created': 'Thu, 28 Jun 2018 19:57:29 GMT'}
{'version': 'v5', 'created': 'Fri, 17 May 2019 14:00:30 GMT'}]
|
2020-04-22
|
[array(['Constantine', 'David', ''], dtype=object)
array(['Lafont', 'Jean-François', ''], dtype=object)
array(['Thompson', 'Daniel J.', ''], dtype=object)]
|
7,337 |
1703.08830
|
Kay Jin Lim
|
Kay Jin Lim
|
Straightening rule for an $m'$-truncated polynomial ring
| null | null | null | null |
math.RT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a certain quotient of a polynomial ring categorified by both the
isomorphic Green rings of the symmetric groups and Schur algebras generated by
the signed Young permutation modules and mixed powers respectively. They have
bases parametrised by pairs of partitions whose second partitions are multiples
of the odd prime $p$ the characteristic of the underlying field. We provide an
explicit formula rewriting a signed Young permutation module (respectively,
mixed power) in terms of signed Young permutation modules (respectively, mixed
powers) labelled by those pairs of partitions. As a result, for each partition
$\lambda$, we discovered the number of compositions $\delta$ such that $\delta$
can be rearranged to $\lambda$ and whose partial sums of $\delta$ are not
divisible by $p$.
|
[{'version': 'v1', 'created': 'Sun, 26 Mar 2017 15:54:18 GMT'}
{'version': 'v2', 'created': 'Wed, 17 Oct 2018 07:21:27 GMT'}]
|
2018-10-18
|
[array(['Lim', 'Kay Jin', ''], dtype=object)]
|
7,338 |
chao-dyn/9304007
|
Petr Kurka
|
Petr Kurka (Charles University, Prague)
|
One-dimensional dynamics and factors of finite automata
|
Latex, 15 pages
| null | null | null |
chao-dyn nlin.CD
| null |
We argue that simple dynamical systems are factors of finite automata,
regarded as dynamical systems on discontinuum. We show that any homeomorphism
of the real interval is of this class. An orientation preserving homeomorphism
of the circle is a factor of a finite automaton iff its rotation number is
rational. Any $S$-unimodal system on the real interval, whose kneading sequence
is either periodic odd or preperiodic, is also a factor of a finite automaton,
while $S$-unimodal systems at limits of period doubling bifurcations are not.
|
[{'version': 'v1', 'created': 'Fri, 16 Apr 1993 13:34:54 GMT'}]
|
2008-02-03
|
[array(['Kurka', 'Petr', '', 'Charles University, Prague'], dtype=object)]
|
7,339 |
1706.03521
|
Xuelei Sui
|
Xuelei Sui, Tao Hu, Jianfeng Wang, Bing-Lin Gu, Wenhui Duan, Mao-sheng
Miao
|
Voltage-Controllable Colossal Magnetocrystalline Anisotropy in Single
Layer Transition Metal Dichalcogenides
| null |
Phys. Rev. B 96, 041410 (2017)
|
10.1103/PhysRevB.96.041410
| null |
cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Materials with large magnetocrystalline anisotropy and strong electric field
effects are highly needed to develop new types of memory devices based on
electric field control of spin orientations. Instead of using modified
transition metal films, we propose that certain monolayer transition metal
dichalcogenides are the ideal candidate materials for this purpose. Using
density functional calculations, we show that they exhibit not only a large
magnetocrystalline anisotropy (MCA), but also colossal voltage modulation under
external field. Notably, in some materials like CrSe_2 and FeSe_2, where spins
show a strong preference for in-plane orientation, they can be switched to
out-of-plane direction. This effect is attributed to the large band character
alteration that the transition metal d-states undergo around the Fermi energy
due to the electric field. We further demonstrate that strain can also greatly
change MCA, and can help to improve the modulation efficiency while combined
with an electric field.
|
[{'version': 'v1', 'created': 'Mon, 12 Jun 2017 09:03:52 GMT'}]
|
2017-08-02
|
[array(['Sui', 'Xuelei', ''], dtype=object)
array(['Hu', 'Tao', ''], dtype=object)
array(['Wang', 'Jianfeng', ''], dtype=object)
array(['Gu', 'Bing-Lin', ''], dtype=object)
array(['Duan', 'Wenhui', ''], dtype=object)
array(['Miao', 'Mao-sheng', ''], dtype=object)]
|
7,340 |
2204.02176
|
Indira Chatterji
|
Indira Chatterji and Guido Mislin
|
On the Idempotent Conjecture for Sidki Doubles
|
16 pages
| null | null | null |
math.GR
|
http://creativecommons.org/licenses/by/4.0/
|
Let $G$ be a group and $X(G)$ its Sidki Double. The idempotent conjecture
says that there should be no non-trivial idempotent in the complex group ring
of a torsion-free group. We investigate this conjecture for the Sidki double of
a torsion-free group, and obtain a partial result.
|
[{'version': 'v1', 'created': 'Tue, 5 Apr 2022 13:01:09 GMT'}]
|
2022-04-06
|
[array(['Chatterji', 'Indira', ''], dtype=object)
array(['Mislin', 'Guido', ''], dtype=object)]
|
7,341 |
1703.00717
|
Yshai Avishai
|
Y. Avishai and Y. B. Band
|
Simple spin-orbit based devices for electron spin polarization
|
9 PRB pages
|
Phys. Rev. B 95, 104429 (2017)
|
10.1103/PhysRevB.95.104429
| null |
cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose quantum devices having spin-orbit coupling (but no magnetic fields
or magnetic materials) that, when attached to leads, yield a high degree of
transmitted electron polarization. An example of such a simple device is
treated within a tight binding model composed of two 1D chains coupled by
several consecutive rungs (i.e., a ladder) and subject to a gate voltage. The
ensuing scattering problem (with Rashba spin-orbit coupling) is solved, and a
sizable polarization is predicted. When the ladder is twisted into a helix (as
in DNA), the curvature energy augments the polarization. For a system with
random spin-orbit coupling, the distribution of polarization is broad, hence a
high degree of polarization can be obtained in a measurement of a given
disorder-realization. When disorder occurs in a double helix structure then,
depending on scattering energy, the variance of the polarization distribution
can increase even further due to helix curvature.
|
[{'version': 'v1', 'created': 'Thu, 2 Mar 2017 11:12:23 GMT'}
{'version': 'v2', 'created': 'Wed, 15 Mar 2017 02:58:12 GMT'}]
|
2017-03-29
|
[array(['Avishai', 'Y.', ''], dtype=object)
array(['Band', 'Y. B.', ''], dtype=object)]
|
7,342 |
cond-mat/9701218
|
Thomas Hagenaars
|
T.J. Hagenaars, E.H. Brandt, R.E. Hetzel, W. Hanke, M. Leghissa, G.
Saemann-Ischenko
|
Vortex-line liquid phases: Longitudinal superconductivity in the lattice
London model
|
8 pages, Revtex, with eps figures. To appear in Phys. Rev. B
|
Phys. Rev. B 55 (1997) 11706
|
10.1103/PhysRevB.55.11706
| null |
cond-mat.supr-con
| null |
We study the vortex-line lattice and liquid phases of a clean type-II
superconductor by means of Monte Carlo simulations of the lattice London model.
Motivated by a recent controversy regarding the presence, within this model, of
a vortex-liquid regime with longitudinal superconducting coherence over long
length scales, we directly compare two different ways to calculate the
longitudinal coherence. For an isotropic superconductor, we interpret our
results in terms of a temperature regime within the liquid phase in which
longitudinal superconducting coherence extends over length scales larger than
the system thickness studied. We note that this regime disappears in the
moderately anisotropic case due to a proliferation, close to the flux-line
lattice melting temperature, of vortex loops between the layers.
|
[{'version': 'v1', 'created': 'Thu, 30 Jan 1997 14:01:54 GMT'}]
|
2009-10-30
|
[array(['Hagenaars', 'T. J.', ''], dtype=object)
array(['Brandt', 'E. H.', ''], dtype=object)
array(['Hetzel', 'R. E.', ''], dtype=object)
array(['Hanke', 'W.', ''], dtype=object)
array(['Leghissa', 'M.', ''], dtype=object)
array(['Saemann-Ischenko', 'G.', ''], dtype=object)]
|
7,343 |
1004.1831
|
Amos Altshuler
|
Amos Altshuler
|
On Space's Topology
| null | null | null | null |
gr-qc math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It seems to be a common belief that the space in which we live is a
space-time manifold of dimension at least four. In the present article we wish
to draw attention to a slightly different possibility - a space-time
pseudomanifold (or even a generalized pseudomanifold of one dimension or
another). Basically, a pseudomanifold is in a sense a manifold K with certain
irremovable singularities inherited in the topological structure of K, and
prior and independent to any metric or differential structure imposed on K. We
explain this term for dimension 3, but it holds analogously for higher
dimensions as well ([5], [2,Sec.4]).
|
[{'version': 'v1', 'created': 'Sun, 11 Apr 2010 18:36:24 GMT'}]
|
2010-04-13
|
[array(['Altshuler', 'Amos', ''], dtype=object)]
|
7,344 |
1810.01612
|
Shi-Ju Ran
|
Shi-Ju Ran, Bin Xi, Cheng Peng, Gang Su, and Maciej Lewenstein
|
Efficient Quantum Simulation for Thermodynamics of Infinite-size
Many-body Systems in Arbitrary Dimensions
|
9 pages, 9 figures
|
Phys. Rev. B 99, 205132 (2019)
|
10.1103/PhysRevB.99.205132
| null |
cond-mat.str-el physics.comp-ph quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work we propose to simulate many-body thermodynamics of infinite-size
quantum lattice models in one, two, and three dimensions, in terms of few-body
models of only O(10) sites, which we coin as quantum entanglement simulators
(QES's). The QES is described by a temperature-independent Hamiltonian, with
the boundary interactions optimized by the tensor network methods to mimic the
entanglement between the bulk and environment in a finite-size canonical
ensemble. The reduced density matrix of the physical bulk then gives that of
the infinite-size canonical ensemble under interest. We show that the QES can,
for instance, accurately simulate varieties of many-body phenomena, including
finite-temperature crossover and algebraic excitations of the one-dimensional
spin liquid, the phase transitions and low-temperature physics of the two- and
three-dimensional antiferromagnets, and the crossovers of the two-dimensional
topological system. Our work provides an efficient way to explore the
thermodynamics of intractable quantum many-body systems with easily accessible
systems.
|
[{'version': 'v1', 'created': 'Wed, 3 Oct 2018 07:28:05 GMT'}
{'version': 'v2', 'created': 'Sat, 17 Nov 2018 13:28:32 GMT'}
{'version': 'v3', 'created': 'Wed, 22 May 2019 01:53:56 GMT'}]
|
2019-05-23
|
[array(['Ran', 'Shi-Ju', ''], dtype=object)
array(['Xi', 'Bin', ''], dtype=object)
array(['Peng', 'Cheng', ''], dtype=object)
array(['Su', 'Gang', ''], dtype=object)
array(['Lewenstein', 'Maciej', ''], dtype=object)]
|
7,345 |
1110.1680
|
Silas Hoffman
|
Silas Hoffman, Ya. M. Blanter, Yaroslav Tserkovnyak
|
Nonlinear Dynamics in a Magnetic Josephson Junction
|
8 pages, 5 figures
| null |
10.1103/PhysRevB.86.054427
| null |
cond-mat.mes-hall cond-mat.supr-con
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We theoretically consider a Josephson junction formed by a ferromagnetic
spacer with a strong spin-orbit interaction or a magnetic spin valve, i.e., a
bilayer with one static and one free layer. Electron spin transport facilitates
a nonlinear dynamical coupling between the magnetic moment and charge current,
which consists of normal and superfluid components. By phenomenologically
adding reactive and dissipative interactions (guided by structural and Onsager
symmetries), we construct magnetic torques and charge pumping, whose
microscopic origins are also discussed. A stability analysis of our coupled
nonlinear systems generates a rich phase diagram with fixed points, limit
cycles, and quasiperiodic states. Our findings reduce to the known phase
diagrams for current-biased nonmagnetic Josephson junctions, on the one hand,
and spin-torque driven magnetic films, on the other, in the absence of coupling
between the magnetic and superconducting order parameters.
|
[{'version': 'v1', 'created': 'Fri, 7 Oct 2011 23:38:11 GMT'}]
|
2015-05-30
|
[array(['Hoffman', 'Silas', ''], dtype=object)
array(['Blanter', 'Ya. M.', ''], dtype=object)
array(['Tserkovnyak', 'Yaroslav', ''], dtype=object)]
|
7,346 |
2109.07948
|
Imed Zaguia
|
Maurice Pouzet and Imed Zaguia
|
Metric properties of incomparability graphs with an emphasis on paths
|
27 pages, 6 figures
| null | null | null |
math.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We describe some metric properties of incomparability graphs. We consider the
problem of the existence of infinite paths, either induced or isometric, in the
incomparability graph of a poset. Among other things, we show that if the
incomparability graph of a poset is connected and has infinite diameter, then
it contains an infinite induced path. Furthermore, if the diameter of the set
of vertices of degree at least $3$ is infinite, then the graph contains as an
induced subgraph either a comb or a kite.
|
[{'version': 'v1', 'created': 'Thu, 16 Sep 2021 13:04:38 GMT'}
{'version': 'v2', 'created': 'Fri, 18 Feb 2022 21:16:14 GMT'}]
|
2022-02-22
|
[array(['Pouzet', 'Maurice', ''], dtype=object)
array(['Zaguia', 'Imed', ''], dtype=object)]
|
7,347 |
2101.12541
|
Zhichao Fang
|
Zhichao Fang (1), Jie Zhao (1 and 2), Hong Li (1), Yang Liu (1) ((1)
Inner Mongolia University, (2) Inner Mongolia University of Finance and
Economics)
|
Finite Volume Element Methods for Two-Dimensional Time Fractional
Reaction-Diffusion Equations on Triangular Grids
|
22 pages,1 figure
| null | null | null |
math.NA cs.NA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, the time fractional reaction-diffusion equations with the
Caputo fractional derivative are solved by using the classical $L1$-formula and
the finite volume element (FVE) methods on triangular grids. The existence and
uniqueness for the fully discrete FVE scheme are given. The stability result
and optimal \textit{a priori} error estimate in $L^2(\Omega)$-norm are derived,
but it is difficult to obtain the corresponding results in $H^1(\Omega)$-norm,
so another analysis technique is introduced and used to achieve our goal.
Finally, two numerical examples in different spatial dimensions are given to
verify the feasibility and effectiveness.
|
[{'version': 'v1', 'created': 'Fri, 29 Jan 2021 12:26:03 GMT'}]
|
2021-02-01
|
[array(['Fang', 'Zhichao', '', '1 and 2'], dtype=object)
array(['Zhao', 'Jie', '', '1 and 2'], dtype=object)
array(['Li', 'Hong', ''], dtype=object)
array(['Liu', 'Yang', ''], dtype=object)]
|
7,348 |
1005.0175
|
Marcus Werner Beims Prof
|
MS Cust\'odio and MW Beims
|
Intrinsic stickiness in open integrable billiards: tiny border effects
|
06 pages, 5 figures.
| null |
10.1103/PhysRevE.83.056201
| null |
physics.class-ph nlin.CD
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Rounding border effects at the escape point of open integrable billiards are
analyzed via the escape times statistics and emission angles. The model is the
rectangular billiard and the shape of the escape point is assumed to have a
semicircular form. Stickiness and self-similar structures for the escape times
and emission angles are generated inside "backgammon" like stripes of initial
conditions. These stripes are born at the boundary between two different
emission angles but same escape times. As the rounding effects increase,
backgammon stripes start to overlap and the escape times statistics obeys the
power law decay and anomalous diffusion is expected. Tiny rounded borders
(around $0.1\%$ from the whole billiard size) are shown to be sufficient to
generate the sticky motion, while borders larger than $10\%$ are enough to
produce escape times with chaotic decay.
|
[{'version': 'v1', 'created': 'Mon, 3 May 2010 01:43:29 GMT'}]
|
2015-05-18
|
[array(['Custódio', 'MS', ''], dtype=object)
array(['Beims', 'MW', ''], dtype=object)]
|
7,349 |
0902.1080
|
Baptiste Jeudy
|
Baptiste Jeudy (LAHC), Christine Largeron (LAHC), Fran\c{c}ois
Jacquenet (LAHC)
|
A Model for Managing Collections of Patterns
| null |
ACM Symposium on Applied Computing, Seoul : Cor\'ee, R\'epublique
de (2007)
| null | null |
cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Data mining algorithms are now able to efficiently deal with huge amount of
data. Various kinds of patterns may be discovered and may have some great
impact on the general development of knowledge. In many domains, end users may
want to have their data mined by data mining tools in order to extract patterns
that could impact their business. Nevertheless, those users are often
overwhelmed by the large quantity of patterns extracted in such a situation.
Moreover, some privacy issues, or some commercial one may lead the users not to
be able to mine the data by themselves. Thus, the users may not have the
possibility to perform many experiments integrating various constraints in
order to focus on specific patterns they would like to extract. Post processing
of patterns may be an answer to that drawback. Thus, in this paper we present a
framework that could allow end users to manage collections of patterns. We
propose to use an efficient data structure on which some algebraic operators
may be used in order to retrieve or access patterns in pattern bases.
|
[{'version': 'v1', 'created': 'Fri, 6 Feb 2009 12:50:12 GMT'}]
|
2009-02-09
|
[array(['Jeudy', 'Baptiste', '', 'LAHC'], dtype=object)
array(['Largeron', 'Christine', '', 'LAHC'], dtype=object)
array(['Jacquenet', 'François', '', 'LAHC'], dtype=object)]
|
7,350 |
2209.08768
|
Hang Zhou
|
Hang Zhou, Dongyi Wei and Fang Yao
|
Theory of functional principal component analysis for noisy and
discretely observed data
| null | null | null | null |
math.ST stat.TH
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Functional data analysis is an important research field in statistics which
treats data as random functions drawn from some infinite-dimensional functional
space, and functional principal component analysis (FPCA) based on
eigen-decomposition plays a central role for data reduction and representation.
After nearly three decades of research, there remains a key problem unsolved,
namely, the perturbation analysis of covariance operator for diverging number
of eigencomponents obtained from noisy and discretely observed data. This is
fundamental for studying models and methods based on FPCA, while there has not
been substantial progress since Hall, M\"uller and Wang (2006)'s result for a
fixed number of eigenfunction estimates. In this work, we aim to establish a
unified theory for this problem, deriving the moment bounds of eigenfunctions
and asymptotic distributions of eigenvalues for a wide range of sampling
schemes. Our results provide insight into the phenomenon when the
$\mathcal{L}^{2}$ bound of eigenfunction estimates with diverging indices is
minimax optimal as if the curves are fully observed, and reveal the transition
of convergence rates from nonparametric to parametric regimes in connection to
sparse or dense sampling. We also propose a double truncation technique to
derive the uniform convergence (in time domain) of estimated eigenfunctions for
the first time. The technical arguments in this work are useful for handling
the perturbation series with noisy and discretely observed data and can be
applied in models or those involving inverse problems based on FPCA as
regularization, such as functional linear regression.
|
[{'version': 'v1', 'created': 'Mon, 19 Sep 2022 05:16:19 GMT'}
{'version': 'v2', 'created': 'Sun, 25 Dec 2022 05:00:30 GMT'}
{'version': 'v3', 'created': 'Tue, 30 May 2023 16:11:03 GMT'}]
|
2023-05-31
|
[array(['Zhou', 'Hang', ''], dtype=object)
array(['Wei', 'Dongyi', ''], dtype=object)
array(['Yao', 'Fang', ''], dtype=object)]
|
7,351 |
1301.4485
|
F. Luke Wolcott
|
F. Luke Wolcott
|
Bousfield lattices of non-Noetherian rings: some quotients and products
|
24 pages. to appear in Homology, Homotopy, and Applications
| null | null | null |
math.AT math.AC math.CT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the context of a well generated tensor triangulated category, Section 3
investigates the relationship between the Bousfield lattice of a quotient and
quotients of the Bousfield lattice. In Section 4 we develop a general framework
to study the Bousfield lattice of the derived category of a commutative or
graded-commutative ring, using derived functors induced by extension of
scalars. Section 5 applies this work to extend results of Dwyer and Palmieri
[DP08] to new non-Noetherian rings.
|
[{'version': 'v1', 'created': 'Fri, 18 Jan 2013 20:32:44 GMT'}
{'version': 'v2', 'created': 'Mon, 14 Jul 2014 22:18:30 GMT'}]
|
2014-07-16
|
[array(['Wolcott', 'F. Luke', ''], dtype=object)]
|
7,352 |
1701.00304
|
Sylvester Gates Jr.
|
S. James Gates Jr., Forrest Guyton, Siddhartha Harmalkar, David S.
Kessler, Vadim Korotkikh, and Victor A. Meszaros
|
Adinkras From Ordered Quartets of BC${}_4$ Coxeter Group Elements and
Regarding 1,358,954,496 Matrix Elements of the Gadget
|
LaTeX twice, 56pp, 30 tables, 5 figures, latest version includes link
to updated code, minor corrections, and additional support about inequivalent
representations and tetrahedral geometry comments added along with
observations about similarity with results previously found by Nekrasov
| null |
10.1007/JHEP06(2017)006
|
Univ. of Maryland PPN UMDEPP-017-011, Brown Univ. PPN HET-1678
|
hep-th math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We examine values of the Adinkra Holoraumy-induced Gadget representation
space metric over all possible four-color, four-open node, and four-closed node
adinkras. Of the 1,358,954,496 gadget matrix elements, only 226,492,416 are
non-vanishing and take on one of three values: $-1/3$, $1/3$, or $1$ and thus a
subspace isomorphic to a description of a body-centered tetrahedral molecule
emerges.
|
[{'version': 'v1', 'created': 'Mon, 2 Jan 2017 02:15:47 GMT'}
{'version': 'v2', 'created': 'Sat, 4 Feb 2017 04:22:47 GMT'}
{'version': 'v3', 'created': 'Mon, 20 Mar 2017 11:15:37 GMT'}
{'version': 'v4', 'created': 'Mon, 22 May 2017 18:26:50 GMT'}
{'version': 'v5', 'created': 'Wed, 24 May 2017 10:45:54 GMT'}]
|
2017-06-28
|
[array(['Gates', 'S. James', 'Jr.'], dtype=object)
array(['Guyton', 'Forrest', ''], dtype=object)
array(['Harmalkar', 'Siddhartha', ''], dtype=object)
array(['Kessler', 'David S.', ''], dtype=object)
array(['Korotkikh', 'Vadim', ''], dtype=object)
array(['Meszaros', 'Victor A.', ''], dtype=object)]
|
7,353 |
hep-th/0212224
|
Thorsten Ohl
|
Thorsten Ohl (Wuerzburg University), Juergen Reuter (Karlsruhe
University)
|
Clockwork SUSY: Supersymmetric Ward and Slavnov-Taylor Identities At
Work in Green's Functions and Scattering Amplitudes
|
12 pages, feynmp.sty. References added, minor typos corrected and
clarified the scope of the paper in the introduction, published version
|
Eur.Phys.J.C30:525-536,2003
|
10.1140/epjc/s2003-01301-7
|
WUE-ITP-2002-038, TTP 02-42
|
hep-th hep-ph
| null |
We study the cancellations among Feynman diagrams that implement the Ward and
Slavnov-Taylor identities corresponding to the conserved supersymmetry current
in supersymmetric quantum field theories. In particular, we show that the
Faddeev-Popov ghosts of gauge- and supersymmetries never decouple from the
physical fields, even for abelian gauge groups. The supersymmetric
Slavnov-Taylor identities provide efficient consistency checks for automatized
calculations and can verify the supersymmetry of Feynman rules and the
numerical stability of phenomenological predictions simultaneously.
|
[{'version': 'v1', 'created': 'Wed, 18 Dec 2002 20:50:20 GMT'}
{'version': 'v2', 'created': 'Thu, 19 Dec 2002 18:03:07 GMT'}
{'version': 'v3', 'created': 'Mon, 2 Jun 2003 14:30:54 GMT'}
{'version': 'v4', 'created': 'Thu, 9 Oct 2003 18:27:01 GMT'}
{'version': 'v5', 'created': 'Tue, 27 May 2008 10:35:20 GMT'}]
|
2008-11-26
|
[array(['Ohl', 'Thorsten', '', 'Wuerzburg University'], dtype=object)
array(['Reuter', 'Juergen', '', 'Karlsruhe\n University'], dtype=object)]
|
7,354 |
1701.06501
|
Victor-Emmanuel Brunel
|
Victor-Emmanuel Brunel, Ankur Moitra, Philippe Rigollet, John Urschel
|
Maximum likelihood estimation of determinantal point processes
| null | null | null | null |
math.ST stat.TH
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Determinantal point processes (DPPs) have wide-ranging applications in
machine learning, where they are used to enforce the notion of diversity in
subset selection problems. Many estimators have been proposed, but surprisingly
the basic properties of the maximum likelihood estimator (MLE) have received
little attention. The difficulty is that it is a non-concave maximization
problem, and such functions are notoriously difficult to understand in high
dimensions, despite their importance in modern machine learning. Here we study
both the local and global geometry of the expected log-likelihood function. We
prove several rates of convergence for the MLE and give a complete
characterization of the case where these are parametric. We also exhibit a
potential curse of dimensionality where the asymptotic variance of the MLE
scales exponentially with the dimension of the problem. Moreover, we exhibit an
exponential number of saddle points, and give evidence that these may be the
only critical points.
|
[{'version': 'v1', 'created': 'Mon, 23 Jan 2017 17:01:26 GMT'}
{'version': 'v2', 'created': 'Fri, 3 Mar 2017 19:36:58 GMT'}
{'version': 'v3', 'created': 'Fri, 21 Jul 2017 20:28:05 GMT'}]
|
2017-07-25
|
[array(['Brunel', 'Victor-Emmanuel', ''], dtype=object)
array(['Moitra', 'Ankur', ''], dtype=object)
array(['Rigollet', 'Philippe', ''], dtype=object)
array(['Urschel', 'John', ''], dtype=object)]
|
7,355 |
2201.06860
|
Michele Missikoff
|
Michele Missikoff
|
A Knowledge-driven Business Process Analysis Canvas
|
15 pages, 3 fugures, 4 tables
| null | null | null |
cs.SE cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Business process (BP) analysis represents a first key phase of information
system development. It consists in the gathering of domain knowledge and its
organization to be later used in the software development, and beyond (e.g.,
for Business Process Reengineering). The quality of the developed information
system largely depends on how the BP analysis has been carried out and the
quality of the produced requirement specification documents. Despite the fact
that the issue is on the table for decades, business process analysis is still
a critical phase of information systems development. One promising strategy is
an early and more important involvement of business experts in the BP analysis.
This paper presents a methodology that aims at an early involvement of business
experts while providing a formal grounding that guarantees the quality of the
produced specifications. To this end, we propose the Business Process Analysis
Canvas, a knowledge framework organized in eight knowledge sections aimed at
supporting the business expert in carrying out the analysis, eventually
yielding a BP analysis Ontology.
|
[{'version': 'v1', 'created': 'Tue, 18 Jan 2022 10:34:00 GMT'}]
|
2022-01-19
|
[array(['Missikoff', 'Michele', ''], dtype=object)]
|
7,356 |
1810.06735
|
Sarah Frei
|
Sarah Frei
|
Moduli spaces of sheaves on K3 surfaces and Galois representations
|
16 pages. Minor changes to match published version, which appeared in
Selecta Math
| null | null | null |
math.AG math.NT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider two K3 surfaces defined over an arbitrary field, together with a
smooth proper moduli space of stable sheaves on each. When the moduli spaces
have the same dimension, we prove that if the \'etale cohomology groups (with
Q_ell coefficients) of the two surfaces are isomorphic as Galois
representations, then the same is true of the two moduli spaces. In particular,
if the field of definition is finite and the K3 surfaces have equal zeta
functions, then so do the moduli spaces, even when the moduli spaces are not
birational.
|
[{'version': 'v1', 'created': 'Mon, 15 Oct 2018 22:37:13 GMT'}
{'version': 'v2', 'created': 'Wed, 17 Jul 2019 23:09:36 GMT'}
{'version': 'v3', 'created': 'Wed, 12 May 2021 22:14:09 GMT'}]
|
2021-05-14
|
[array(['Frei', 'Sarah', ''], dtype=object)]
|
7,357 |
2207.04431
|
Loukas Grimanellis
|
L. Grimanellis and G. Papadopoulos
|
TCFHs, IIB warped AdS backgrounds and hidden symmetries
|
29 pages
| null |
10.1007/JHEP05(2023)110
| null |
hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We present the twisted covariant form hierarchies (TCFHs) on the internal
spaces of all type IIB warped AdS backgrounds. As a result we demonstrate that
the form bilinears on the internal spaces satisfy a generalisation of the
conformal Killing-Yano equation. We also explore some of the properties of the
TCFHs, like for example the holonomy of the TCFH connections. In addition, we
present examples where the form bilinears generate hidden symmetries for
particle probes propagating on the internal spaces of some AdS backgrounds.
These include the maximally supersymmetric AdS$_5$ solution as well as some of
the near horizon geometries of intersecting IIB branes.
|
[{'version': 'v1', 'created': 'Sun, 10 Jul 2022 10:46:26 GMT'}]
|
2023-05-31
|
[array(['Grimanellis', 'L.', ''], dtype=object)
array(['Papadopoulos', 'G.', ''], dtype=object)]
|
7,358 |
1306.1882
|
Pavel Shevchenko V
|
Pavel V. Shevchenko and Gareth W. Peters
|
Loss Distribution Approach for Operational Risk Capital Modelling under
Basel II: Combining Different Data Sources for Risk Estimation
| null |
The Journal of Governance and Regulation 2(3), pages 33-57, (2013)
| null | null |
q-fin.RM q-fin.ST
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The management of operational risk in the banking industry has undergone
significant changes over the last decade due to substantial changes in
operational risk environment. Globalization, deregulation, the use of complex
financial products and changes in information technology have resulted in
exposure to new risks very different from market and credit risks. In response,
Basel Committee for banking Supervision has developed a regulatory framework,
referred to as Basel II, that introduced operational risk category and
corresponding capital requirements. Over the past five years, major banks in
most parts of the world have received accreditation under the Basel II Advanced
Measurement Approach (AMA) by adopting the loss distribution approach (LDA)
despite there being a number of unresolved methodological challenges in its
implementation. Different approaches and methods are still under hot debate. In
this paper, we review methods proposed in the literature for combining
different data sources (internal data, external data and scenario analysis)
which is one of the regulatory requirement for AMA.
|
[{'version': 'v1', 'created': 'Sat, 8 Jun 2013 04:58:09 GMT'}]
|
2014-05-22
|
[array(['Shevchenko', 'Pavel V.', ''], dtype=object)
array(['Peters', 'Gareth W.', ''], dtype=object)]
|
7,359 |
2201.11720
|
Maosheng Yang
|
Maosheng Yang, Elvin Isufi, Michael T. Schaub, Geert Leus
|
Simplicial Convolutional Filters
|
16 pages, 13 figures, 2 tables
| null |
10.1109/TSP.2022.3207045
| null |
eess.SP cs.LG cs.SI math.AT math.SP
|
http://creativecommons.org/licenses/by-sa/4.0/
|
We study linear filters for processing signals supported on abstract
topological spaces modeled as simplicial complexes, which may be interpreted as
generalizations of graphs that account for nodes, edges, triangular faces etc.
To process such signals, we develop simplicial convolutional filters defined as
matrix polynomials of the lower and upper Hodge Laplacians. First, we study the
properties of these filters and show that they are linear and shift-invariant,
as well as permutation and orientation equivariant. These filters can also be
implemented in a distributed fashion with a low computational complexity, as
they involve only (multiple rounds of) simplicial shifting between upper and
lower adjacent simplices. Second, focusing on edge-flows, we study the
frequency responses of these filters and examine how we can use the
Hodge-decomposition to delineate gradient, curl and harmonic frequencies. We
discuss how these frequencies correspond to the lower- and the upper-adjacent
couplings and the kernel of the Hodge Laplacian, respectively, and can be tuned
independently by our filter designs. Third, we study different procedures for
designing simplicial convolutional filters and discuss their relative
advantages. Finally, we corroborate our simplicial filters in several
applications: to extract different frequency components of a simplicial signal,
to denoise edge flows, and to analyze financial markets and traffic networks.
|
[{'version': 'v1', 'created': 'Thu, 27 Jan 2022 18:26:27 GMT'}
{'version': 'v2', 'created': 'Wed, 14 Sep 2022 12:57:58 GMT'}]
|
2022-10-19
|
[array(['Yang', 'Maosheng', ''], dtype=object)
array(['Isufi', 'Elvin', ''], dtype=object)
array(['Schaub', 'Michael T.', ''], dtype=object)
array(['Leus', 'Geert', ''], dtype=object)]
|
7,360 |
math/9903024
|
Huai-Dong Cao
|
Huai-Dong Cao and Jian Zhou
|
Formal Frobenius manifold structure on equivariant cohomology
|
AMS-LaTex, 14 pages
| null | null | null |
math.DG
| null |
For a closed K\"{a}hler manifold with a Hamiltonian action of a connected
compact Lie group by holomorphic isometries, we construct a formal Frobenius
manifold structure on the equivariant cohomology by exploiting a natural DGBV
algebra structure on the Cartan model.
|
[{'version': 'v1', 'created': 'Tue, 2 Mar 1999 20:53:00 GMT'}]
|
2007-05-23
|
[array(['Cao', 'Huai-Dong', ''], dtype=object)
array(['Zhou', 'Jian', ''], dtype=object)]
|
7,361 |
1812.00902
|
Petr Mandrik
|
Petr Mandrik (for the FCC study group)
|
Prospect for top quark FCNC searches at the FCC-hh
|
4 pages, 2 figures, 1 table, presented at IV international conference
on particle physics and astrophysics
| null |
10.1088/1742-6596/1390/1/012044
| null |
hep-ex hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
FCC-hh is a proposed future energy-frontier hadron collider, which goal is to
provide high luminosity proton collisions at a centre-of-mass energy of 100
TeV. The FCC-hh has an extremely rich physics program ranging from standard
model (SM) measurements to direct searches for physics beyond the standard
model (BSM). One of the processes sensitive to new physics is flavour-changing
neutral currents (FCNC) that extremely rare in the SM but have enhanced
behavior in several BSM scenarios. In this report we present results of
projections of FCNC searches in top quark interactions to the FCC-hh conditions
based on Monte-Carlo simulation of FCC-hh detector.
|
[{'version': 'v1', 'created': 'Mon, 3 Dec 2018 17:02:47 GMT'}
{'version': 'v2', 'created': 'Mon, 10 Dec 2018 15:13:16 GMT'}]
|
2020-01-08
|
[array(['Mandrik', 'Petr', '', 'for the FCC study group'], dtype=object)]
|
7,362 |
math/9812009
|
Boris Shoikhet
|
Boris Shoikhet (Independent University, Moscow)
|
On the Duflo formula for $L_\infty$-algebras and Q-manifolds
|
11 pages, LaTeX2e
| null | null | null |
math.QA
| null |
We prove a direct analogue of the classical Duflo formula in the case of
$L_\infty$-algebras. We conjecture an analogous formula in the case of an
arbitrary Q-manifold. When $G$ is a compact connected Lie group, the Duflo
theorem for the Q-manifold $(\Pi TG,d_{DR})$ is exactly the Duflo theorem for
the Lie algebra $g = Lie G$. The corresponding theorem for the Q-manifold $(\Pi
TM,d_{DR})$, where $M$ is an arbitrary smooth manifold, is a generalization of
the Duflo theorem for the case of smooth manifolds. On the other hand, the
Duflo theorem for the Q-manifold $(\Pi \bar T_{hol} M, \bar\partial)$, where
$M$ is a complex manifold, is a generalization of the M. Kontsevich's ``theorem
on complex manifold'' [K1], Sect. 8.4.
|
[{'version': 'v1', 'created': 'Tue, 1 Dec 1998 19:42:25 GMT'}
{'version': 'v2', 'created': 'Mon, 7 Dec 1998 12:32:39 GMT'}]
|
2007-05-23
|
[array(['Shoikhet', 'Boris', '', 'Independent University, Moscow'],
dtype=object) ]
|
7,363 |
1804.00834
|
Seiji Sakoda
|
Seiji Sakoda
|
Path integrals of a particle in a finite interval and on the half-line
| null | null | null | null |
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We make use of point transformations to introduce new canonical variables for
systems defined on a finite interval and on the half-line so that new position
variables should take all real values from $-\infty$ to $\infty$. The
completeness of eigenvectors of new momentum operators enables us to formulate
time sliced path integrals for such systems. Short time kernels thus obtained
require extension of the range of variables to the covering space in order to
take all reflected paths into account. Upon this extension we determine phase
factors attached to the amplitude for paths reflected at boundaries by taking
singularities of the potential into account. It will be shown that the phase
factor depends on parameters that characterize the potential; and further that
the well-know minus sign in the amplitude for odd times reflection of a
particle in a box should be understood as the special case for the
corresponding value of the parameter of the potential.
|
[{'version': 'v1', 'created': 'Tue, 3 Apr 2018 06:00:48 GMT'}
{'version': 'v2', 'created': 'Mon, 3 Sep 2018 05:36:58 GMT'}]
|
2018-09-05
|
[array(['Sakoda', 'Seiji', ''], dtype=object)]
|
7,364 |
2107.06391
|
Yunhui Wu
|
Yunhui Wu, Jose Ordonez-Miranda, Laurent Jalabert, Saeko Tachikawa,
Roman Anufriev, Hiroyuki Fujita, Sebastian Volz, and Masahiro Nomura
|
Observation of quasi-ballistic thermal transport of surface
phonon-polaritons over hundreds of micrometres
| null | null | null | null |
cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Long-distance propagation of heat carriers is essential for efficient heat
dissipation in microelectronics. However, in dielectric nanomaterials, the
primary heat carriers - phonons - can propagate ballistically only for hundreds
of nanometres, which limits their heat conduction efficiency. Theory predicts
that surface phonon-polaritons (SPhPs) can overcome this limitation and conduct
heat without dissipation for hundreds of micrometres. In this work, we
experimentally demonstrate such long-distance heat transport by SPhPs. Using
the 3$\omega$ technique, we measure the in-plane thermal conductivity of SiN
nanomembranes for different heater-sensor distances (100 and 200 $\mu$m),
membrane thicknesses (30 - 200 nm), and temperatures (300 - 400 K). We find
that in contrast with thick membranes, thin nanomembranes support heat
conduction by SPhPs, as evidenced by an increase in the thermal conductivity
with temperature. Remarkably, the thermal conductivity measured 200 $\mu$m away
from the heater are consistently higher than that measured 100 $\mu$m closer.
This result suggests that heat conduction by SPhPs is quasi-ballistic over at
least hundreds of micrometres. Thus, our findings show that SPhPs can enhance
heat dissipation in polar nanomembranes and find applications in thermal
management, near-field radiation, and polaritonics.
|
[{'version': 'v1', 'created': 'Mon, 12 Jul 2021 09:52:32 GMT'}]
|
2021-07-15
|
[array(['Wu', 'Yunhui', ''], dtype=object)
array(['Ordonez-Miranda', 'Jose', ''], dtype=object)
array(['Jalabert', 'Laurent', ''], dtype=object)
array(['Tachikawa', 'Saeko', ''], dtype=object)
array(['Anufriev', 'Roman', ''], dtype=object)
array(['Fujita', 'Hiroyuki', ''], dtype=object)
array(['Volz', 'Sebastian', ''], dtype=object)
array(['Nomura', 'Masahiro', ''], dtype=object)]
|
7,365 |
1511.06626
|
Christopher Tibbs
|
C. T. Tibbs, R. Paladini, K. Cleary, S. J. C. Muchovej, A. M. M.
Scaife, M. A. Stevenson, R. J. Laureijs, N. Ysard, K. J. B. Grainge, Y. C.
Perrott, C. Rumsey, J. Villadsen
|
Using cm Observations to Constrain the Abundance of Very Small Dust
Grains in Galactic Cold Cores
|
Accepted for publication in MNRAS
| null |
10.1093/mnras/stv2759
| null |
astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this analysis we illustrate how the relatively new emission mechanism
known as spinning dust can be used to characterize dust grains in the
interstellar medium. We demonstrate this by using spinning dust emission
observations to constrain the abundance of very small dust grains (a $\lesssim$
10nm) in a sample of Galactic cold cores. Using the physical properties of the
cores in our sample as inputs to a spinning dust model, we predict the expected
level of emission at a wavelength of 1cm for four different very small dust
grain abundances, which we constrain by comparing to 1cm CARMA observations.
For all of our cores we find a depletion of very small grains, which we suggest
is due to the process of grain growth. This work represents the first time that
spinning dust emission has been used to constrain the physical properties of
interstellar dust grains.
|
[{'version': 'v1', 'created': 'Fri, 20 Nov 2015 15:01:03 GMT'}]
|
2016-01-27
|
[array(['Tibbs', 'C. T.', ''], dtype=object)
array(['Paladini', 'R.', ''], dtype=object)
array(['Cleary', 'K.', ''], dtype=object)
array(['Muchovej', 'S. J. C.', ''], dtype=object)
array(['Scaife', 'A. M. M.', ''], dtype=object)
array(['Stevenson', 'M. A.', ''], dtype=object)
array(['Laureijs', 'R. J.', ''], dtype=object)
array(['Ysard', 'N.', ''], dtype=object)
array(['Grainge', 'K. J. B.', ''], dtype=object)
array(['Perrott', 'Y. C.', ''], dtype=object)
array(['Rumsey', 'C.', ''], dtype=object)
array(['Villadsen', 'J.', ''], dtype=object)]
|
7,366 |
1702.00004
|
Jacob Spear Mr
|
J. L. Spear, N. Pliatsikas, N. Kalfagiannis, P. Patsalas, D. C.
Koutsogeorgis
|
Localised surface plasmon resonance spectroscopy: naked nanoparticle
sensing
|
3 pages & 3 figures, research letter
| null | null | null |
physics.ins-det cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a simplified yet sophisticated variation to localised surface
plasmon resonance spectroscopy, which makes use of naked or non-functionalised,
nanoparticle templates. These nanoparticle templates, produced with a rapid and
scalable process, namely laser annealing, were used as a highly sensitive
surface sensor to monitor the adsorption of both metallic lead and a lead salt
from aqueous solutions, showing a measurable optical response due to a surface
abundance of lead as low as 100 ppm from 0.3 ml of Pb2SO4 solutions, with
concentrations less than 20 ppm. This proposed method enables the end user to
rapidly assess the surface abundance of lead from a simple optical reflectance
measurement and could serve as a platform for in situ analysis within water
filtration and cleaning systems.
|
[{'version': 'v1', 'created': 'Tue, 31 Jan 2017 13:05:02 GMT'}]
|
2017-02-02
|
[array(['Spear', 'J. L.', ''], dtype=object)
array(['Pliatsikas', 'N.', ''], dtype=object)
array(['Kalfagiannis', 'N.', ''], dtype=object)
array(['Patsalas', 'P.', ''], dtype=object)
array(['Koutsogeorgis', 'D. C.', ''], dtype=object)]
|
7,367 |
math/9712227
|
Walter D. Neumann
|
Walter D. Neumann, Gadde A. Swarup
|
Canonical decompositions of 3-manifolds
|
20 pages. Published copy, also available at
http://www.maths.warwick.ac.uk/gt/GTVol1/paper3.abs.html
|
Geom. Topol. 1 (1997) 21-40
|
10.2140/gt.1997.1.21
|
G&T migration 1997-3
|
math.GT
| null |
We describe a new approach to the canonical decompositions of 3-manifolds
along tori and annuli due to Jaco-Shalen and Johannson (with ideas from
Waldhausen) - the so-called JSJ-decomposition theorem. This approach gives an
accessible proof of the decomposition theorem; in particular it does not use
the annulus-torus theorems, and the theory of Seifert fibrations does not need
to be developed in advance.
|
[{'version': 'v1', 'created': 'Thu, 4 Dec 1997 07:00:23 GMT'}
{'version': 'v2', 'created': 'Wed, 30 Jul 1997 00:00:00 GMT'}]
|
2014-11-11
|
[array(['Neumann', 'Walter D.', ''], dtype=object)
array(['Swarup', 'Gadde A.', ''], dtype=object)]
|
7,368 |
1104.0139
|
Oleg Petracic
|
A. Ebbing, O. Hellwig, L. Agudo, G. Eggeler, and O. Petracic
|
Tuning the magnetic properties of Co nanoparticles by Pt capping
| null |
Physical Review B 84, 012405 (2011)
|
10.1103/PhysRevB.84.012405
| null |
cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that by capping Co nanoparticles with small amounts of Pt strong
changes of the magnetic properties can be induced. The Co nanoparticles have a
mean diameter of 2.7 nm. From magnetometry measurements we find that for zero
and for small amounts of Pt (nominal thickness t(Pt) < 0.7 nm) the
nanoparticles behave superparamagnetic like. With increasing t(Pt) the blocking
temperature is enhanced from 16 up to 108 K. Capping with Pd yields comparable
results. However, for values t(Pt) > 1 nm a strongly coupled state is
encountered resembling a ferromagnet with a T_c approx. 400 K
|
[{'version': 'v1', 'created': 'Fri, 1 Apr 2011 10:53:33 GMT'}]
|
2015-05-27
|
[array(['Ebbing', 'A.', ''], dtype=object)
array(['Hellwig', 'O.', ''], dtype=object)
array(['Agudo', 'L.', ''], dtype=object)
array(['Eggeler', 'G.', ''], dtype=object)
array(['Petracic', 'O.', ''], dtype=object)]
|
7,369 |
astro-ph/9712083
|
John Barrow
|
Kandaswamy Subramanian and John D. Barrow
|
Magnetohydrodynamics in the Early Universe and the Damping of Non-linear
Alfven Waves
|
45 pages, Tex file, no figures
|
Phys.Rev.D58:083502,1998
|
10.1103/PhysRevD.58.083502
| null |
astro-ph
| null |
The evolution and viscous damping of cosmic magnetic fields in the early
universe, is analysed. Using the fact that the fluid, electromagnetic, and
shear viscous energy-momentum tensors are all conformally invariant, the
evolution is transformed from the expanding universe setting into that in flat
spacetime. Particular attention is paid to the evolution of nonlinear Alfven
modes. For a small enough magnetic field, which satisfies our observational
constraints, these wave modes either oscillate negligibly or, when they do
oscillate, become overdamped. Hence they do not suffer Silk damping on galactic
and subgalactic scales. The smallest scale which survives damping depends on
the field strength and is of order a dimensionless Alfven velocity times the
usual baryon-photon Silk damping scale. After recombination, nonlinear effects
can convert the Alfven mode into compressional, gravitationally unstable waves
and seed cosmic structures if the cosmic magnetic field is sufficiently strong.
|
[{'version': 'v1', 'created': 'Fri, 5 Dec 1997 14:12:17 GMT'}]
|
2011-09-29
|
[array(['Subramanian', 'Kandaswamy', ''], dtype=object)
array(['Barrow', 'John D.', ''], dtype=object)]
|
7,370 |
2003.13099
|
Carlo Vittorio Cannistraci
|
Mengqiao Xu, Qian Pan, Alessandro Muscoloni, Haoxiang Xia, Carlo
Vittorio Cannistraci
|
Modular gateway-ness connectivity and structural core organization in
maritime network science
| null | null |
10.1038/s41467-020-16619-5
| null |
physics.soc-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Around 80% of global trade by volume is transported by sea, and thus the
maritime transportation system is fundamental to the world economy. To better
exploit new international shipping routes, we need to understand the current
ones and their complex systems association with international trade. We
investigate the structure of the global liner shipping network (GLSN), finding
it is an economic small-world network with a trade-off between high
transportation efficiency and low wiring cost. To enhance understanding of this
trade-off, we examine the modular segregation of the GLSN; we study
provincial-, connector-hub ports and propose the definition of gateway-hub
ports, using three respective structural measures. The gateway-hub
structural-core organization seems a salient property of the GLSN, which proves
importantly associated to network integration and function in realizing the
cargo transportation of international trade. This finding offers new insights
into the GLSN's structural organization complexity and its relevance to
international trade.
|
[{'version': 'v1', 'created': 'Sun, 29 Mar 2020 18:18:52 GMT'}]
|
2020-07-01
|
[array(['Xu', 'Mengqiao', ''], dtype=object)
array(['Pan', 'Qian', ''], dtype=object)
array(['Muscoloni', 'Alessandro', ''], dtype=object)
array(['Xia', 'Haoxiang', ''], dtype=object)
array(['Cannistraci', 'Carlo Vittorio', ''], dtype=object)]
|
7,371 |
2104.13929
|
Justin Kaidi
|
Justin Kaidi, Mario Martone
|
A new rank-2 Argyres-Douglas theory
|
6 pages
|
Phys. Rev. D 104, 085004 (2021)
|
10.1103/PhysRevD.104.085004
| null |
hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We provide evidence for the existence of a new strongly-coupled four
dimensional $\mathcal{N}=2$ superconformal field theory arising as a
non-trivial IR fixed point on the Coulomb branch of the mass-deformed
superconformal Lagrangian theory with gauge group $G_2$ and four fundamental
hypermultiplets. Notably, our analysis proceeds by using various geometric
constraints to bootstrap the data of the theory, and makes no explicit
reference to the Seiberg-Witten curve. We conjecture a corresponding VOA and
check that the vacuum character satisfies a linear modular differential
equation of fourth order. We also propose an identification with existing class
$\mathcal{S}$ constructions.
|
[{'version': 'v1', 'created': 'Wed, 28 Apr 2021 18:00:01 GMT'}
{'version': 'v2', 'created': 'Sat, 5 Jun 2021 00:41:58 GMT'}]
|
2021-10-04
|
[array(['Kaidi', 'Justin', ''], dtype=object)
array(['Martone', 'Mario', ''], dtype=object)]
|
7,372 |
2203.09841
|
Elisa Iacomini
|
Michael Herty and Elisa Iacomini
|
Filtering methods for coupled inverse problems
| null | null | null | null |
math.NA cs.NA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We are interested in ensemble methods to solve multi-objective optimization
problems. An ensemble Kalman method is proposed to solve a formulation of the
nonlinear problem using a weighted function approach. An analysis of the mean
field limit of the ensemble method yields an explicit update formula for the
weights. Numerical examples show the improved performance of the proposed
method.
|
[{'version': 'v1', 'created': 'Fri, 18 Mar 2022 10:30:26 GMT'}]
|
2022-03-21
|
[array(['Herty', 'Michael', ''], dtype=object)
array(['Iacomini', 'Elisa', ''], dtype=object)]
|
7,373 |
1211.4786
|
Bj\"orn Obry
|
Bj\"orn Obry (1), Thomas Meyer (1), Philipp Pirro (1), Thomas
Br\"acher (1 and 2), Bert L\"agel (3), Julia Osten (4), Thomas Strache (4),
J\"urgen Fassbender (4) and Burkard Hillebrands (1) ((1) Fachbereich Physik
and Forschungszentrum OPTIMAS, Technische Universit\"at Kaiserslautern,
Germany, (2) Graduate School Materials Science in Mainz, Germany, (3) Nano
Structuring Center, Technische Universit\"at Kaiserslautern, Germany, (4)
Institut f\"ur Ionenstrahlphysik und Materialforschung, Helmholtz-Zentrum
Dresden-Rossendorf, Germany, and Technische Universit\"at Dresden, Germany)
|
Microscopic magnetic structuring of a spin-wave waveguide by ion
implantation in a Ni(81)Fe(19) layer
|
Submitted to Applied Physics Letters, 4 pages, 3 figures
|
Appl. Phys. Lett. 102, 022409 (2013)
|
10.1063/1.4775759
| null |
cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the spin-wave excitation in microscopic waveguides fabricated
by localized Cr+ ion implantation in a ferromagnetic Ni(81)Fe(19) film. We
demonstrate that spin-wave waveguides can be conveniently made by this
technique. The magnetic patterning technique yields an increased damping and a
reduction in saturation magnetization in the implanted regions that can be
extracted from Brillouin light scattering measurements of the spin-wave
excitation spectra. Furthermore, the waveguide performance as well as the
internal field of the waveguide depend on the doping fluence. The results prove
that localized ion implantation is a powerful tool for the patterning of magnon
spintronic devices.
|
[{'version': 'v1', 'created': 'Tue, 20 Nov 2012 16:00:45 GMT'}]
|
2013-10-09
|
[array(['Obry', 'Björn', '', '1 and 2'], dtype=object)
array(['Meyer', 'Thomas', '', '1 and 2'], dtype=object)
array(['Pirro', 'Philipp', '', '1 and 2'], dtype=object)
array(['Brächer', 'Thomas', '', '1 and 2'], dtype=object)
array(['Lägel', 'Bert', ''], dtype=object)
array(['Osten', 'Julia', ''], dtype=object)
array(['Strache', 'Thomas', ''], dtype=object)
array(['Fassbender', 'Jürgen', ''], dtype=object)
array(['Hillebrands', 'Burkard', ''], dtype=object)]
|
7,374 |
1511.00639
|
Alexander Patkowski
|
Alexander E Patkowski
|
On some Integrals associated with the Riesz function
|
Accepted at Journal of Combinatorics and Number Theory
| null | null | null |
math.NT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore some integrals associated with the Riesz function and establish
relations to other functions from number theory that have appeared in the
literature. We also comment on properties of these functions.
|
[{'version': 'v1', 'created': 'Mon, 2 Nov 2015 19:21:17 GMT'}
{'version': 'v2', 'created': 'Sat, 29 Jul 2017 03:47:30 GMT'}]
|
2017-08-01
|
[array(['Patkowski', 'Alexander E', ''], dtype=object)]
|
7,375 |
1910.12503
|
Riccardo Rurali
|
Marta De Luca, Xavier Cartoix\`a, Javier Mart\'in-S\'anchez, Miquel
L\'opez-Su\'arez, Rinaldo Trotta, Riccardo Rurali, and Ilaria Zardo
|
New insights in the lattice dynamics of monolayers, bilayers, and
trilayers of WSe2 and unambiguous determination of few-layer-flakes'
thickness
| null |
De Luca et al., 2D Mater. 7, 025004 (2020)
|
10.1088/2053-1583/ab5dec
| null |
cond-mat.mtrl-sci cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Among the most common few-layers transition metal dichalcogenides (TMDs),
WSe2 is the most challenging material from the lattice dynamics point of view.
Indeed, for a long time the main two phonon modes (A1g and E12g) have been
wrongly assigned. In the last few years, these two modes have been properly
interpreted, and their quasi-degeneracy in the monolayer has been used for its
identification. In this work, we show that this approach has a limited validity
and we propose an alternative, more general approach, based on multi-phonon
bands. Moreover, we show and interpret all the peaks (about 40) appearing in
the Raman spectra of monolayers, bilayers, and trilayers of WSe2 by combining
experimental wavelength- and polarization-dependent Raman studies with
density-functional theory calculations providing the phonon dispersions, the
polarization-resolved first-order Raman spectra, and the one- and two-phonon
density of states. This complete study not only offers a method to distinguish
between monolayers, bilayers, and trilayers with no need of optical images and
atomic force microscopy, but it also sheds light on the interpretation of
single and multi-phonon bands appearing in the inelastic light scattering
experiments of layered WSe2; some of these bands were never observed before,
and some were observed and uncertainly assigned. We promote the full
understanding of the lattice dynamics of this material that is crucial for the
realization of optoelectronics devices and of novel phononic metamaterials,
such as TMDs superlattices.
|
[{'version': 'v1', 'created': 'Mon, 28 Oct 2019 08:42:15 GMT'}]
|
2020-03-03
|
[array(['De Luca', 'Marta', ''], dtype=object)
array(['Cartoixà', 'Xavier', ''], dtype=object)
array(['Martín-Sánchez', 'Javier', ''], dtype=object)
array(['López-Suárez', 'Miquel', ''], dtype=object)
array(['Trotta', 'Rinaldo', ''], dtype=object)
array(['Rurali', 'Riccardo', ''], dtype=object)
array(['Zardo', 'Ilaria', ''], dtype=object)]
|
7,376 |
0806.0233
|
Volker Kaibel
|
Yuri Faenza and Volker Kaibel
|
Extended Formulations for Packing and Partitioning Orbitopes
|
16 pages
| null | null | null |
math.CO math.OC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We give compact extended formulations for the packing and partitioning
orbitopes (with respect to the full symmetric group) described and analyzed in
(Kaibel and Pfetsch, 2008). These polytopes are the convex hulls of all
0/1-matrices with lexicographically sorted columns and at most, resp. exactly,
one 1-entry per row. They are important objects for symmetry reduction in
certain integer programs.
Using the extended formulations, we also derive a rather simple proof of the
fact that basically shifted-column inequalities suffice in order to describe
those orbitopes linearly.
|
[{'version': 'v1', 'created': 'Mon, 2 Jun 2008 09:09:41 GMT'}]
|
2008-06-14
|
[array(['Faenza', 'Yuri', ''], dtype=object)
array(['Kaibel', 'Volker', ''], dtype=object)]
|
7,377 |
1501.00522
|
Jun He Dr.
|
Jun He
|
The internal structures of the nucleon resonances $N(1875)$ and
$N(2120)$
|
5 pages, 2 figures
|
Phys.Rev. C91 (2015) 1, 018201
|
10.1103/PhysRevC.91.018201
| null |
nucl-th hep-lat hep-ph nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A nucleon resonance with spin-parity $J^P=3/2^-$ and mass about 2.1 GeV is
essential to reproduce the photoproduction cross sections for $\Lambda(1520)$
released by the LEPS and CLAS Collaborations. It can be explained as the third
nucleon resonance state $[3/2^-]_3$ in the constituent quark model so that
there is no position to settle the $N(1875)$ which is listed in the PDG as the
third $N3/2^-$ nucleon resonance. An interpretation is proposed that the
$N(1875)$ is from the interaction of a decuplet baryon $\Sigma(1385)$ and a
octet meson $K$, which is favored by a calculation of binding energy and decay
pattern in a Bethe-Salpeter approach.
|
[{'version': 'v1', 'created': 'Sat, 3 Jan 2015 03:14:03 GMT'}]
|
2015-04-27
|
[array(['He', 'Jun', ''], dtype=object)]
|
7,378 |
1509.00542
|
Thomas Boiveau
|
Thomas Boiveau
|
Fitted and unfitted domain decomposition using penalty free Nitsche
method for the Poisson problem with discontinuous material parameters
| null | null | null | null |
math.NA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we study the stability of the non symmetric version of the
Nitsche's method without penalty for domain decomposition. The Poisson problem
is considered as a model problem. The computational domain is divided into two
subdomain that can have different material parameters. In the first half of the
paper we are interested in nonconforming domain decomposition, each subdomain
is meshed independently of each other. In the second half, we study unfitted
domain decomposition, the computational domain has only one mesh and we allow
the interface to cut elements of the mesh. The fictitious domain method is used
to handle this specificity. We prove $H^1$-convergence and $L^2$-convergence of
the error in both cases. Some numerical results are provided to corroborate the
theoretical study.
|
[{'version': 'v1', 'created': 'Wed, 2 Sep 2015 01:58:09 GMT'}]
|
2015-09-03
|
[array(['Boiveau', 'Thomas', ''], dtype=object)]
|
7,379 |
1001.0991
|
Alexey Kuznetsov
|
Alexey Kuznetsov
|
On extrema of stable processes
|
Published in at http://dx.doi.org/10.1214/10-AOP577 the Annals of
Probability (http://www.imstat.org/aop/) by the Institute of Mathematical
Statistics (http://www.imstat.org)
|
Annals of Probability 2011, Vol. 39, No. 3, 1027-1060
|
10.1214/10-AOP577
|
IMS-AOP-AOP577
|
math.PR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the Wiener--Hopf factorization and the distribution of extrema for
general stable processes. By connecting the Wiener--Hopf factors with a certain
elliptic-like function we are able to obtain many explicit and general results,
such as infinite series representations and asymptotic expansions for the
density of supremum, explicit expressions for the Wiener--Hopf factors and the
Mellin transform of the supremum, quasi-periodicity and functional identities
for these functions, finite product representations in some special cases and
identities in distribution satisfied by the supremum functional.
|
[{'version': 'v1', 'created': 'Thu, 7 Jan 2010 07:29:00 GMT'}
{'version': 'v2', 'created': 'Mon, 14 Jun 2010 15:11:11 GMT'}
{'version': 'v3', 'created': 'Fri, 8 Apr 2011 09:54:40 GMT'}]
|
2011-04-11
|
[array(['Kuznetsov', 'Alexey', ''], dtype=object)]
|
7,380 |
2111.09247
|
Marcella Palese
|
Marcella Palese, Ekkehart Winterroth
|
A cohomological obstruction in higher dimensional Chern--Simons gauge
theories
|
20 pages. arXiv admin note: text overlap with arXiv:2103.03037
|
Int. Jour. Geom. Meth. Mod. Phys. 19 (03) (2022) 2250032
|
10.1142/S0219887822500323
| null |
hep-th math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study a set of cohomology classes which emerge in the cohomological
formulations of the calculus of variations as obstructions to the existence of
(global) solutions of the Euler--Lagrange equations of Chern--Simons gauge
theories in higher dimensions $2p+1 > 3$.
|
[{'version': 'v1', 'created': 'Wed, 17 Nov 2021 17:26:06 GMT'}]
|
2022-03-16
|
[array(['Palese', 'Marcella', ''], dtype=object)
array(['Winterroth', 'Ekkehart', ''], dtype=object)]
|
7,381 |
1712.04474
|
Dibyendu Roy
|
Pooja Manasi and Dibyendu Roy
|
Light propagation through one-dimensional interacting open quantum
systems
|
18 pages, 11 figures
|
Phys. Rev. A 98, 023802 (2018)
|
10.1103/PhysRevA.98.023802
| null |
quant-ph cond-mat.mes-hall cond-mat.stat-mech
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We apply the quantum Langevin equations approach to study nonlinear light
propagation through one-dimensional interacting open quantum lattice models. We
write a large set of quantum Langevin equations of lattice operators obtained
after integrating out the light fields and use them to derive nonequilibrium
features of the lattice models. We first consider a Heisenberg like interacting
spin-1/2 chain with nearest-neighbor coupling. The transient and steady-state
transport properties of an incoming monochromatic laser light are calculated
for this model. We find how the local features of the spin chain and the chain
length dependence of light transport coefficient evolve with an increasing
power of the incident light. The steady-state light transmission coefficient at
a higher power depends non-monotonically on the interaction in a finite chain.
While the nonlinear light transmission in our studied model seems to be
ballistic in the absence of interaction and for a high interaction, it shows an
apparent system-size dependence at intermediate interactions. Later, we extend
this method to the long-range interaction between spins of the
driven-dissipative lattice model and to incorporate various losses typical in
many atomic and solid-state systems.
|
[{'version': 'v1', 'created': 'Tue, 12 Dec 2017 19:14:22 GMT'}
{'version': 'v2', 'created': 'Fri, 3 Aug 2018 13:18:08 GMT'}]
|
2018-08-06
|
[array(['Manasi', 'Pooja', ''], dtype=object)
array(['Roy', 'Dibyendu', ''], dtype=object)]
|
7,382 |
1009.4018
|
Chikashi Arita
|
Chikashi Arita and Kohei Motegi
|
Spin-spin correlation functions of the q-VBS state of an integer spin
model
| null |
Journal of Mathematical Physics 52, 063303 (2011)
|
10.1063/1.3598424
| null |
math-ph cond-mat.stat-mech math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the valence-bond-solid ground state of the q-deformed higher-spin
AKLT model (q-VBS state). We investigate the eigenvalues and eigenvectors of a
matrix (G matrix), which is constructed from the matrix product representation
of the q-VBS state. We compute the longitudinal and transverse spin-spin
correlation functions, and determine the correlation amplitudes and correlation
lengths for real q.
|
[{'version': 'v1', 'created': 'Tue, 21 Sep 2010 08:26:13 GMT'}
{'version': 'v2', 'created': 'Tue, 27 Sep 2011 12:49:19 GMT'}
{'version': 'v3', 'created': 'Mon, 2 Jan 2012 22:03:31 GMT'}]
|
2015-05-20
|
[array(['Arita', 'Chikashi', ''], dtype=object)
array(['Motegi', 'Kohei', ''], dtype=object)]
|
7,383 |
1608.07622
|
Youshan Tao
|
Youshan Tao and Michael Winkler
|
Critical mass for infinite-time aggregation in a chemotaxis model with
indirect signal production
|
37 pages, to appear in Journal of the European Mathematical Society
| null | null | null |
math.AP
|
http://creativecommons.org/licenses/by/4.0/
|
We study the Neumann initial-boundary problem for the chemotaxis system $$
\left\{\begin{array}{ll} u_t= \Delta u - \nabla \cdot (u\nabla v), & x\in
\Omega, \, t>0, 0=\Delta v - \mu(t)+w, & x\in \Omega, \, t>0, \tau w_t + \delta
w = u, & x\in \Omega, \, t>0, \end{array} \right. \qquad \qquad (\star) $$ in
the unit disk $\Omega:=B_1(0)\subset \R^2$, where $\delta\ge 0$ and $\tau>0$
are given parameters and $\mu(t):=\mint_\Omega w(x,t)dx$, $t>0$. It is shown
that this problem exhibits a novel type of critical mass phenomenon with regard
to the formation of singularities, which drastically differs from the
well-known threshold property of the classical Keller-Segel system, as obtained
upon formally taking $\tau\to 0$, in that it refers to blow-up in infinite time
rather than in finite time: Specifically, it is first proved that for any
sufficiently regular nonnegative initial data $u_0$ and $w_0$, ($\star$)
possesses a unique global classical solution. In particular, this shows that in
sharp contrast to classical Keller-Segel-type systems reflecting immediate
signal secretion by the cells themselves, the indirect mechanism of signal
production in ($\star$) entirely rules out any occurrence of blow-up in finite
time. However, within the framework of radially symmetric solutions it is next
proved that whenever $\delta>0$ and $\io u_0<8\pi\delta$, the solution remains
uniformly bounded, whereas for any choice of $\delta\ge 0$ and $m>8\pi\delta$,
one can find initial data such that $\io u_0=m$, and such that for the
corresponding solution we have \bas \|u(\cdot,t)\|_{L^\infty(\Omega)} \to
\infty \qquad \mbox{as} t\to\infty.
|
[{'version': 'v1', 'created': 'Fri, 26 Aug 2016 22:53:11 GMT'}
{'version': 'v2', 'created': 'Tue, 4 Apr 2017 13:31:11 GMT'}]
|
2017-04-05
|
[array(['Tao', 'Youshan', ''], dtype=object)
array(['Winkler', 'Michael', ''], dtype=object)]
|
7,384 |
1009.2853
|
Andreas H\"oring
|
Andreas H\"oring, Claire Voisin
|
Anticanonical divisors and curve classes on Fano manifolds
|
17 pages, changed metadata
| null | null | null |
math.AG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It is well known that the Hodge conjecture with rational coefficients holds
for degree 2n-2 classes on complex projective n-folds. In this paper we study
the more precise question if on a rationally connected complex projective
n-fold the integral Hodge classes of degree 2n-2 are generated over $\mathbb Z$
by classes of curves. We combine techniques from the theory of singularities of
pairs on the one hand and infinitesimal variation of Hodge structures on the
other hand to give an affirmative answer to this question for a large class of
manifolds including Fano fourfolds. In the last case, one step in the proof is
the following result of independent interest: There exist anticanonical
divisors with isolated canonical singularities on a smooth Fano fourfold.
|
[{'version': 'v1', 'created': 'Wed, 15 Sep 2010 07:04:10 GMT'}
{'version': 'v2', 'created': 'Mon, 4 Dec 2017 20:16:52 GMT'}]
|
2017-12-06
|
[array(['Höring', 'Andreas', ''], dtype=object)
array(['Voisin', 'Claire', ''], dtype=object)]
|
7,385 |
0804.2863
|
Shibaji Roy
|
Ashok Das, Sudhakar Panda and Shibaji Roy
|
Origin of the geometric tachyon
|
4 pages, revtex, v2: eq.(22), (24) and (25) corrected
|
Phys.Rev.D78:061901,2008
|
10.1103/PhysRevD.78.061901
| null |
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The motion of a Dp-brane in the background of a stack of coincident
NS5-branes is analysed as the motion of a relativistic point particle in the
transverse space of the five-branes. In this system, the particle experiences a
proper acceleration orthogonal to its proper velocity due to the background
dilaton field which changes the dynamics from that of a simple geodesic motion.
In particular, we show that in the vicinity of the five-branes, it is this
acceleration which is responsible for modifying the motion of the radial mode
to that of an inverted simple harmonic oscillator leading to the tachyonic
instability.
|
[{'version': 'v1', 'created': 'Thu, 17 Apr 2008 17:48:08 GMT'}
{'version': 'v2', 'created': 'Wed, 30 Apr 2008 16:34:44 GMT'}]
|
2009-11-13
|
[array(['Das', 'Ashok', ''], dtype=object)
array(['Panda', 'Sudhakar', ''], dtype=object)
array(['Roy', 'Shibaji', ''], dtype=object)]
|
7,386 |
1711.10347
|
Salim Rostam
|
Salim Rostam
|
Stuttering blocks of Ariki-Koike algebras
|
47 pages. v2: Proposition 2.14 now follows from a result of Fayers.
Minor changes. To appear in Algebraic Combinatorics
|
Algebraic Combinatorics, Volume 2 (2019) no. 1, p. 75-118
|
10.5802/alco.40
| null |
math.RT math.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study a shift action defined on multipartitions and on residue multisets
of their Young diagrams. We prove that the minimal orbit cardinality among all
multipartitions associated to a given multiset depends only on the orbit
cardinality of the multiset. Using abaci, this problem reduces to a convex
optimisation problem over the integers with linear constraints. We solve it by
proving an existence theorem for binary matrices with prescribed row, column
and block sums. Finally, we give some applications to the representation theory
of the Hecke algebra of the complex reflection group $G(r,p,n)$.
|
[{'version': 'v1', 'created': 'Tue, 28 Nov 2017 15:38:47 GMT'}
{'version': 'v2', 'created': 'Fri, 23 Nov 2018 08:56:31 GMT'}]
|
2019-04-18
|
[array(['Rostam', 'Salim', ''], dtype=object)]
|
7,387 |
hep-th/9904168
|
Albert Schwarz
|
Albert Schwarz (UCDavis)
|
Quantum observables, Lie algebra homology and TQFT
|
10 pages
|
Lett.Math.Phys. 49 (1999) 115-122
| null |
UCD-9904
|
hep-th
| null |
Let us consider a Lie (super)algebra $G$ spanned by $T_{\alpha}$ where
$T_{\alpha}$ are quantum observables in BV-formalism. It is proved that for
every tensor $c^{\alpha_1...\alpha_k}$ that determines a homology class of the
Lie algebra $G$ the expression $c^{\alpha_1...\alpha_k}T_{\alpha
_1}...T_{\alpha_k}$ is again a quantum observables. This theorem is used to
construct quantum observables in BV sigma-model. We apply this construction to
explain Kontsevich's results about the relation between homology of the Lie
algebra of Hamiltonian vector fields and topological invariants of manifolds.
|
[{'version': 'v1', 'created': 'Sun, 25 Apr 1999 06:04:04 GMT'}]
|
2007-05-23
|
[array(['Schwarz', 'Albert', '', 'UCDavis'], dtype=object)]
|
7,388 |
0706.2391
|
Sergey V. Lototsky
|
S. V. Lototsky and K. Stemmann
|
From Random Processes to Generalized Fields: A Unified Approach to
Stochastic Integration
| null | null | null | null |
math.PR
| null |
The paper studies stochastic integration with respect to Gaussian processes
and fields. It is more convenient to work with a field than a process: by
definition, a field is a collection of stochastic integrals for a class of
deterministic integrands. The problem is then to extend the definition to
random integrands. An orthogonal decomposition of chaos space of the random
field leads to two such extensions, corresponding to the \Ito-Skorokhod and the
Stratononovich integrals, and provides an efficient tool to study these
integrals, both analytically and numerically. For a Gaussian process, a natural
definition of the integral follows from a canonical correspondence between
random processes and a special class of random fields.
|
[{'version': 'v1', 'created': 'Sat, 16 Jun 2007 01:14:44 GMT'}]
|
2007-06-19
|
[array(['Lototsky', 'S. V.', ''], dtype=object)
array(['Stemmann', 'K.', ''], dtype=object)]
|
7,389 |
2102.12247
|
Jiale Chen
|
Jiale Chen, Yuqing Kong and Yuxuan Lu
|
Equal Affection or Random Selection: the Quality of Subjective Feedback
from a Group Perspective
| null | null | null | null |
cs.GT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the setting where a group of agents is asked a single subjective
multi-choice question (e.g. which one do you prefer? cat or dog?), we are
interested in evaluating the quality of the collected feedback. However, the
collected statistics are not sufficient to reflect how informative the feedback
is since fully informative feedback (equal affection of the choices) and fully
uninformative feedback (random selection) have the same uniform statistics.
Here we distinguish the above two scenarios by additionally asking for
respondents' predictions about others' choices. We assume that informative
respondents' predictions strongly depend on their own choices while
uninformative respondents' do not. With this assumption, we propose a new
definition for uninformative feedback and correspondingly design a family of
evaluation metrics, called f-variety, for group-level feedback which can 1)
distinguish informative feedback and uninformative feedback (separation) even
if their statistics are both uniform and 2) decrease as the ratio of
uninformative respondents increases (monotonicity). We validate our approach
both theoretically and numerically. Moreover, we conduct two real-world case
studies about 1) comparisons about athletes and 2) comparisons about stand-up
comedians to show the superiority of our approach.
|
[{'version': 'v1', 'created': 'Wed, 24 Feb 2021 12:16:00 GMT'}]
|
2021-02-25
|
[array(['Chen', 'Jiale', ''], dtype=object)
array(['Kong', 'Yuqing', ''], dtype=object)
array(['Lu', 'Yuxuan', ''], dtype=object)]
|
7,390 |
0804.4437
|
Matthew B. Stone
|
M. B. Stone, M. D. Lumsden, S. Chang, E. C. Samulon, C. D. Batista, I.
R. Fisher
|
Singlet-triplet dispersion reveals additional frustration in the
triangular dimer compound Ba$_3$Mn$_2$O$_8$
|
4 pages, 3 color figures, submitted to an APS physical review journal
| null |
10.1103/PhysRevLett.100.237201
| null |
cond-mat.str-el
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present single crystal inelastic neutron scattering measurements of the
S=1 dimerized quasi-two-dimensional antiferromagnet Ba$_3$Mn$_2$O$_8$. The
singlet-triplet dispersion reveals nearest-neighbor and next-nearest-neighbor
ferromagnetic interactions between adjacent bilayers that compete against each
other. Although the inter-bilayer exchange is comparable to the intra-bilayer
exchange, this additional frustration reduces the effective coupling along the
c-axis and leads to a quasi-two dimensional behavior. In addition, the obtained
exchange values are able to reproduce the four critical fields in the phase
diagram.
|
[{'version': 'v1', 'created': 'Mon, 28 Apr 2008 15:56:21 GMT'}]
|
2009-11-13
|
[array(['Stone', 'M. B.', ''], dtype=object)
array(['Lumsden', 'M. D.', ''], dtype=object)
array(['Chang', 'S.', ''], dtype=object)
array(['Samulon', 'E. C.', ''], dtype=object)
array(['Batista', 'C. D.', ''], dtype=object)
array(['Fisher', 'I. R.', ''], dtype=object)]
|
7,391 |
2206.12504
|
Henrike Fleischhack Dr.
|
Eric A. Charles and Henrike Fleischhack and Clio Sleator
|
Gamma-ray detector and mission design simulations
|
To be included in the "Handbook of X-ray and Gamma-ray Astrophysics",
Ed. C. Bambi, A. Santangelo
| null |
10.1007/978-981-16-4544-0_54-1
| null |
astro-ph.IM astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Detectors for gamma-ray astronomy are complex: they often comprise multiple
sub-systems and utilize new and/or custom-developed detector components and
readout electronics. Gamma rays are typically not detected directly:
ground-based detectors measure extensive air showers of charged particles
initiated by cosmic gamma-rays, and even so-called "direct detection"
experiments on balloons or satellites usually reconstruct the incoming
gamma-ray photons' properties from the secondary particles produced in the
detector. At the same time, there are few "standard candles" and no feasible
terrestrial sources of high-energy and very-high-energy gamma rays that could
be used to calibrate the detectors. Simulations of particles interacting in the
atmosphere and/or with the instrument are thus ubiquitous in gamma-ray
astronomy. These simulations are used in event reconstruction and data
analysis, to characterize detector performance, and to optimize detector
design. In this chapter, we give an overview of how and why simulations are
used in gamma-ray astronomy, as well as their limitations. We discuss extensive
air shower simulations, simulations of gamma rays and secondary particles
interacting in the detector, and simulations of the readout electronics. We
provide examples for software packages that are used for various aspects of
simulations in gamma-ray astronomy. Lastly, we describe the performance metrics
and instrument response functions that are generated from these simulations,
which are critical to instrument design and data analysis.
|
[{'version': 'v1', 'created': 'Fri, 24 Jun 2022 22:13:07 GMT'}]
|
2023-04-05
|
[array(['Charles', 'Eric A.', ''], dtype=object)
array(['Fleischhack', 'Henrike', ''], dtype=object)
array(['Sleator', 'Clio', ''], dtype=object)]
|
7,392 |
1105.4472
|
Paola Frediani
|
Elisabetta Colombo, Paola Frediani
|
Prym map and second gaussian map for Prym-canonical line bundles
|
Final version. To appear in Advances in Mathematics
| null | null | null |
math.AG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that the second fundamental form of the Prym map lifts the second
gaussian map of the Prym-canonical bundle. We prove, by degeneration to binary
curves, that this gaussian map is surjective for the general point [C,A] of R_g
for g > 19.
|
[{'version': 'v1', 'created': 'Mon, 23 May 2011 11:43:30 GMT'}
{'version': 'v2', 'created': 'Fri, 13 Jul 2012 13:23:50 GMT'}
{'version': 'v3', 'created': 'Mon, 25 Feb 2013 09:31:27 GMT'}]
|
2013-02-26
|
[array(['Colombo', 'Elisabetta', ''], dtype=object)
array(['Frediani', 'Paola', ''], dtype=object)]
|
7,393 |
1806.04582
|
Yasin Yilmaz
|
Almuthanna T. Nassar and Yasin Yilmaz
|
Reinforcement Learning-based Resource Allocation in Fog RAN for IoT with
Heterogeneous Latency Requirements
| null | null | null | null |
cs.NI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In light of the quick proliferation of Internet of things (IoT) devices and
applications, fog radio access network (Fog-RAN) has been recently proposed for
fifth generation (5G) wireless communications to assure the requirements of
ultra-reliable low-latency communication (URLLC) for the IoT applications which
cannot accommodate large delays. Hence, fog nodes (FNs) are equipped with
computing, signal processing and storage capabilities to extend the inherent
operations and services of the cloud to the edge. We consider the problem of
sequentially allocating the FN's limited resources to the IoT applications of
heterogeneous latency requirements. For each access request from an IoT user,
the FN needs to decide whether to serve it locally utilizing its own resources
or to refer it to the cloud to conserve its valuable resources for future users
of potentially higher utility to the system (i.e., lower latency requirement).
We formulate the Fog-RAN resource allocation problem in the form of a Markov
decision process (MDP), and employ several reinforcement learning (RL) methods,
namely Q-learning, SARSA, Expected SARSA, and Monte Carlo, for solving the MDP
problem by learning the optimum decision-making policies. We verify the
performance and adaptivity of the RL methods and compare it with the
performance of a fixed-threshold-based algorithm. Extensive simulation results
considering 19 IoT environments of heterogeneous latency requirements
corroborate that RL methods always achieve the best possible performance
regardless of the IoT environment.
|
[{'version': 'v1', 'created': 'Sun, 27 May 2018 15:04:58 GMT'}
{'version': 'v2', 'created': 'Tue, 15 Jan 2019 22:01:22 GMT'}]
|
2019-01-17
|
[array(['Nassar', 'Almuthanna T.', ''], dtype=object)
array(['Yilmaz', 'Yasin', ''], dtype=object)]
|
7,394 |
2103.13097
|
Jacques Magnaudet
|
Jean-Lou Pierson, Mohammed Kharrouba and Jacques Magnaudet
|
Hydrodynamic torque on a steadily rotating slender cylinder
|
10 pages, 8 figures
|
Phys. Rev. Fluids 6, 094303 (2021)
|
10.1103/PhysRevFluids.6.094303
| null |
physics.flu-dyn
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
Using fully-resolved simulations, we investigate the torque experienced by a
finite-length circular cylinder rotating steadily perpendicularly to its
symmetry axis. The aspect ratio $\chi$, i.e. the ratio of the length of the
cylinder to its diameter, is varied from 1 to 15. In the creeping-flow regime,
we employ the slender-body theory to derive the expression of the torque up to
order 4 with respect to the small parameter $1/\ln(2\chi)$. Numerical results
agree well with the corresponding predictions for $\chi\gtrsim3$. We introduce
an \textit{ad hoc} modification in the theoretical prediction to fit the
numerical results obtained with shorter cylinders, and a second modification to
account for the increase of the torque resulting from finite inertial effects.
In strongly inertial regimes, a prominent wake pattern made of two pairs of
counter-rotating vortices takes place. Nevertheless the flow remains stationary
and exhibits two distinct symmetries, one of which implies that the
contributions to the torque arising from the two cylinder ends are identical.
We build separate empirical formulas for the contributions of pressure and
viscous stress to the torque provided by the lateral surface and the cylinder
ends. We show that, in each contribution, the dominant scaling law may be
inferred from simple physical arguments. This approach eventually results in an
empirical formula for the rotation-induced torque valid throughout the range of
inertial regimes and aspect ratios considered in the simulations.
|
[{'version': 'v1', 'created': 'Wed, 24 Mar 2021 11:16:21 GMT'}]
|
2021-09-15
|
[array(['Pierson', 'Jean-Lou', ''], dtype=object)
array(['Kharrouba', 'Mohammed', ''], dtype=object)
array(['Magnaudet', 'Jacques', ''], dtype=object)]
|
7,395 |
1908.03751
|
Karl Dilcher
|
Karl Dilcher and Larry Ericksen
|
Polynomial analogues of restricted multicolor b-ary partition functions
| null | null | null | null |
math.NT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Given an integer base $b\geq 2$, a number $\rho\geq 1$ of colors, and a
finite sequence $\Lambda=(\lambda_1,\ldots,\lambda_\rho)$ of positive integers,
we introduce the concept of a $\Lambda$-restricted $\rho$-colored $b$-ary
partition of an integer $n\geq 1$. We also define a sequence of polynomials in
$\lambda_1+\cdots+\lambda_\rho$ variables, and prove that the $n$th polynomial
characterizes all $\Lambda$-restricted $\rho$-colored $b$-ary partitions of
$n$. In the process we define a recurrence relation for the polynomials in
question, obtain explicit formulas and identify a factorization theorem.
|
[{'version': 'v1', 'created': 'Sat, 10 Aug 2019 13:30:10 GMT'}]
|
2019-08-13
|
[array(['Dilcher', 'Karl', ''], dtype=object)
array(['Ericksen', 'Larry', ''], dtype=object)]
|
7,396 |
2012.03974
|
Josh Borrow
|
Josh Borrow (Durham & MIT), Matthieu Schaller (Leiden), Richard G.
Bower (Durham), and Joop Schaye (Leiden)
|
Sphenix: Smoothed Particle Hydrodynamics for the next generation of
galaxy formation simulations
|
Accepted for publication in MNRAS
| null |
10.1093/mnras/stab3166
| null |
astro-ph.GA astro-ph.IM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Smoothed Particle Hydrodynamics (SPH) is a ubiquitous numerical method for
solving the fluid equations, and is prized for its conservation properties,
natural adaptivity, and simplicity. We introduce the Sphenix SPH scheme, which
was designed with three key goals in mind: to work well with sub-grid physics
modules that inject energy, be highly computationally efficient (both in terms
of compute and memory), and to be Lagrangian. Sphenix uses a Density-Energy
equation of motion, along with variable artificial viscosity and conduction,
including limiters designed to work with common sub-grid models of galaxy
formation. In particular, we present and test a novel limiter that prevents
conduction across shocks, preventing spurious radiative losses in feedback
events. Sphenix is shown to solve many difficult test problems for traditional
SPH, including fluid mixing and vorticity conservation, and it is shown to
produce convergent behaviour in all tests where this is appropriate. Crucially,
we use the same parameters within Sphenix for the various switches throughout,
to demonstrate the performance of the scheme as it would be used in production
simulations.
|
[{'version': 'v1', 'created': 'Mon, 7 Dec 2020 19:00:07 GMT'}
{'version': 'v2', 'created': 'Thu, 28 Oct 2021 13:51:29 GMT'}]
|
2021-11-17
|
[array(['Borrow', 'Josh', '', 'Durham & MIT'], dtype=object)
array(['Schaller', 'Matthieu', '', 'Leiden'], dtype=object)
array(['Bower', 'Richard G.', '', 'Durham'], dtype=object)
array(['Schaye', 'Joop', '', 'Leiden'], dtype=object)]
|
7,397 |
1902.00344
|
Suo Liu
|
Suo Liu, Ganghua Lin, Xiao Yang, Xiaofan Wang, Jiangtao Su, Yuanyong
Deng
|
Standard Magnetic Field Production at Huairou Solar Observing Station
|
2page, 1 figure
|
Long-Term Datasets for the Understanding of Solar and Stellar
Magnetic Cycles Proceedings IAU Symposium No. 340, 2018
|
10.1017/S1743921318001333
| null |
astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The regular solar observations are operated at Huairou Solar Observing
Station (HSOS) since 1987, which make the construction of long-term magnetic
field datasets available to understand solar magnetic field and cycles. There
exist some inconveniences for solar physicist to use these data, because the
data storage medium and format at HSOS experienced some changes. Additionally,
the processes of magnetic field calibration are not easy to deal with for who
are not familiar with these data. Here shows that the magnetic field of HSOS
are further processed toward international standards, in order to explore HSOS
observations data for scientific research.
|
[{'version': 'v1', 'created': 'Fri, 1 Feb 2019 14:15:51 GMT'}]
|
2019-02-04
|
[array(['Liu', 'Suo', ''], dtype=object)
array(['Lin', 'Ganghua', ''], dtype=object)
array(['Yang', 'Xiao', ''], dtype=object)
array(['Wang', 'Xiaofan', ''], dtype=object)
array(['Su', 'Jiangtao', ''], dtype=object)
array(['Deng', 'Yuanyong', ''], dtype=object)]
|
7,398 |
1510.05331
|
Irina Holmes
|
Irina Holmes, Robert Rahm, Scott Spencer
|
Two-Weight Inequalities for Commutators with Fractional Integral
Operators
| null |
Studia Math, Volume 233, Number 3, Year 2016, Pages 279-291
| null | null |
math.CA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we investigate weighted norm inequalities for the commutator of
a fractional integral operator and multiplication by a function. In particular,
we show that, for $\mu,\lambda\in A_{p,q}$ and $\alpha/n+1/q=1/p$, the norm $\|
[b,I_\alpha]:L^p(\mu^p)\to L^q(\lambda^q) \|$ is equivalent to the norm of $b$
in the weighted BMO space $BMO(\nu)$, where $\nu=\mu\lambda^{-1}$. This work
extends some of the results on this topic existing in the literature, and
continues a line of investigation which was initiated by Bloom in 1985 and was
recently developed further by the first author, Lacey, and Wick.
|
[{'version': 'v1', 'created': 'Mon, 19 Oct 2015 01:35:36 GMT'}]
|
2016-09-29
|
[array(['Holmes', 'Irina', ''], dtype=object)
array(['Rahm', 'Robert', ''], dtype=object)
array(['Spencer', 'Scott', ''], dtype=object)]
|
7,399 |
0903.1721
|
Vladimir Spokoiny
|
V. Spokoiny
|
A penalized exponential risk bound in parametric estimation
| null | null | null | null |
math.ST stat.TH
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The paper offers a novel unified approach to studying the accuracy of
parameter estimation by the quasi likelihood method. Important features of the
approach are: (1) The underlying model {is not assumed to be parametric}. (2)
No conditions on parameter identifiability are required. The parameter set can
be unbounded. (3) The model assumptions are quite general and there is no
specific structural assumptions like independence or weak dependence of
observations. The imposed conditions on the model are very mild and can be
easily checked in specific applications. (4) The established risk bounds are
{nonasymptotic} and valid for large, moderate and small samples. (5) The main
result is the concentration property of the quasi MLE giving an nonasymptotic
exponential bound for the probability that the considered estimate deviates out
of a small neighborhood of the "true" point.
In standard situations under mild regularity conditions, the usual
consistency and rate results can be easily obtained as corollaries from the
established risk bounds. % The approach and the results are illustrated on the
example of generalized linear and single-index models.
|
[{'version': 'v1', 'created': 'Tue, 10 Mar 2009 09:54:45 GMT'}]
|
2009-03-11
|
[array(['Spokoiny', 'V.', ''], dtype=object)]
|
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