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1.9k
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timestamp[ms]date 2007-05-23 00:00:00
2025-10-08 00:00:00
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listlengths 1
264
| vector
unknown |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1609.03979
|
Zoran Petric
|
Djordje Baralic, Zoran Petric and Sonja Telebakovic
|
Spheres as Frobenius objects
|
32 pages. Some minor corrections
| null | null | null |
math.CT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Following the pattern of the Frobenius structure usually assigned to the
1-dimensional sphere, we investigate the Frobenius structures of spheres in all
other dimensions. Starting from dimension $d=1$, all the spheres are
commutative Frobenius objects in categories whose arrows are
${(d+1)}$-dimensional cobordisms. With respect to the language of Frobenius
objects, there is no distinction between these spheres---they are all free of
additional equations formulated in this language. The corresponding structure
makes out of the 0-dimensional sphere not a commutative but a symmetric
Frobenius object. This sphere is mapped to a matrix Frobenius algebra by a
1-dimensional topological quantum field theory, which corresponds to the
representation of a class of diagrammatic algebras given by Richard Brauer.
|
[
{
"version": "v1",
"created": "Tue, 13 Sep 2016 19:01:16 GMT"
},
{
"version": "v2",
"created": "Wed, 14 Sep 2016 12:44:45 GMT"
},
{
"version": "v3",
"created": "Sat, 17 Sep 2016 19:18:49 GMT"
},
{
"version": "v4",
"created": "Mon, 28 Aug 2017 07:43:07 GMT"
},
{
"version": "v5",
"created": "Wed, 18 Jul 2018 10:01:22 GMT"
}
] | 2018-07-19T00:00:00
|
[
[
"Baralic",
"Djordje",
""
],
[
"Petric",
"Zoran",
""
],
[
"Telebakovic",
"Sonja",
""
]
] |
"LnEcfoLDCMjRcNO//VLw+2Ar5pQUZ7MLVRdCfV//z1QKSFpYDSdI3myVOvUBQbCiwH/xjz+EfkWg71wk2AhdULOVI8ETcFGOHPgEbQ0mHP2f2BzAS4g4vrg5olctBZwZFSe3v8/zgM9ixR/pou9HA0fa1iV+zaPSCVbUNjk6gzo="
|
2402.08343
|
Elie Saad
|
Elie Saad, Mariem Besbes, Marc Zolghadri, Victor Czmil, Vincent
Bourgeois
|
A New Hybrid Approach for Identifying Obsolescence Features: Applied to
Railway Signaling Infrastructure
| null | null | null | null |
eess.SY cs.SY
|
http://creativecommons.org/licenses/by/4.0/
|
Electrical component obsolescence poses a major issue especially within
systems with large life cycles. Thus, finding the optimal management solution
for each obsolescence case is as crucial as knowing what to consider when faced
with an obsolescence case. In this paper, a novel hybrid approach for
identifying features affecting electrical component obsolescence management is
introduced, which combines features engineering techniques and expert
knowledge. The method then uses machine learning to predict obsolescence
resolution techniques in order to find the optimal resolution. The motivation
behind this research is driven by the imperative need for SNCF RESEAU to
optimally address and mitigate the challenges posed by electrical component
obsolescence in railway infrastructure.
|
[
{
"version": "v1",
"created": "Tue, 13 Feb 2024 10:15:20 GMT"
}
] | 2024-02-14T00:00:00
|
[
[
"Saad",
"Elie",
""
],
[
"Besbes",
"Mariem",
""
],
[
"Zolghadri",
"Marc",
""
],
[
"Czmil",
"Victor",
""
],
[
"Bourgeois",
"Vincent",
""
]
] |
"QskOTCgiEtrwDNofLSM7Iw7/Y7flu5tzxlNw4tn/sJzM5FJ9QUBNGE6Fe2G38KbolEzdr5xO2E3Kmm0tYWo4gK0WooSUxUWmlL60rHeiZlih/4HgEoKqJ0iqr5gbBa6Y36s39ZiynX7mZJNlBOYGFd3gHah+ebIsPELWlB+eVj8="
|
1912.13340
|
Huangxin Chen
|
Huangxin Chen, Shuyu Sun
|
A new physics-preserving IMPES scheme for incompressible and immiscible
two-phase flow in heterogeneous porous media
| null | null | null | null |
math.NA cs.NA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work we consider a new efficient IMplicit Pressure Explicit
Saturation (IMPES) scheme for the simulation of incompressible and immiscible
two-phase flow in heterogeneous porous media with capillary pressure. Compared
with the conventional IMPES schemes, the new IMPES scheme is inherently
physics-preserving, namely, the new algorithm is locally mass conservative for
both phases and it also enjoys another appealing feature that the total
velocity is continuous in the normal direction. Moreover, the new scheme is
unbiased with regard to the two phases and the saturations of both phases are
bounds-preserving if the time step size is smaller than a certain value. The
key ideas in the new scheme include that the Darcy flows for both phases are
rewritten in the formulation based on the total velocity and an auxiliary
velocity referring to as the capillary potential gradient, and the total
discretized conservation equation is obtained by the summation of the
discretized conservation equation for each phase. The upwind strategy is
applied to update the saturations explicitly, and the upwind mixed finite
element methods are used to solve the pressure-velocity systems which can be
decoupled. We also present some interesting examples to demonstrate the
efficiency and robustness of the new algorithm.
|
[
{
"version": "v1",
"created": "Tue, 31 Dec 2019 15:07:55 GMT"
}
] | 2020-01-01T00:00:00
|
[
[
"Chen",
"Huangxin",
""
],
[
"Sun",
"Shuyu",
""
]
] |
"XPsAbzzpsYbYXnM9XWkdcyfzZHGUK+veRNUn+XP88FVNQFtZYEjdWGbFoyGZ0aPj4I+Zh9MI3E+sNH3oQsKdBRkMoMQT50SGEfygSBujJm2i7wUAOYOhqrW6+lsIAOEofjK1XLqChOrCAf9ZJX8QI8/ZHSd3XZLkSmfUF5RXQjo="
|
2503.03450
|
Pascal Peter
|
Julia Gierke and Pascal Peter
|
Skeletonisation Scale-Spaces
| null | null | null | null |
eess.IV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The medial axis transform is a well-known tool for shape recognition. Instead
of the object contour, it equivalently describes a binary object in terms of a
skeleton containing all centres of maximal inscribed discs. While this shape
descriptor is useful for many applications, it is also sensitive to noise:
Small boundary perturbations can result in large unwanted expansions of the
skeleton. Pruning offers a remedy by removing unwanted skeleton parts. In our
contribution, we generalise this principle to skeleton sparsification: We show
that subsequently removing parts of the skeleton simplifies the associated
shape in a hierarchical manner that obeys scale-space properties.
To this end, we provide both a continuous and discrete theory that
incorporates architectural and simplification statements as well as
invariances. We illustrate how our skeletonisation scale-spaces can be employed
for practical applications with two proof-of-concept implementations for
pruning and compression.
|
[
{
"version": "v1",
"created": "Wed, 5 Mar 2025 12:27:26 GMT"
}
] | 2025-03-06T00:00:00
|
[
[
"Gierke",
"Julia",
""
],
[
"Peter",
"Pascal",
""
]
] |
"rOkIfIinBaooF8O3fyLxK2AJIxacW7sLxEdm7P19vxXD8CIJRQhteMaHe0/nwran5QZRHx2o+o2oqGihQfs41FmbgcQRS+yMELuEbRZydN2Fv5zKBoD6LRcT4Zo7JT+JB6M1OfY6jezGRRdcJm1GH9/fHKx+vbIRDJNSFix6hj8="
|
2208.08982
|
Pierre-Olivier C\^ot\'e
|
Pierre-Olivier C\^ot\'e, Amin Nikanjam, Rached Bouchoucha, Foutse
Khomh
|
Quality issues in Machine Learning Software Systems
|
Accepted as a registered report by ICSME 2022
| null | null | null |
cs.SE cs.LG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Context: An increasing demand is observed in various domains to employ
Machine Learning (ML) for solving complex problems. ML models are implemented
as software components and deployed in Machine Learning Software Systems
(MLSSs). Problem: There is a strong need for ensuring the serving quality of
MLSSs. False or poor decisions of such systems can lead to malfunction of other
systems, significant financial losses, or even threat to human life. The
quality assurance of MLSSs is considered as a challenging task and currently is
a hot research topic. Moreover, it is important to cover all various aspects of
the quality in MLSSs. Objective: This paper aims to investigate the
characteristics of real quality issues in MLSSs from the viewpoint of
practitioners. This empirical study aims to identify a catalog of bad-practices
related to poor quality in MLSSs. Method: We plan to conduct a set of
interviews with practitioners/experts, believing that interviews are the best
method to retrieve their experience and practices when dealing with quality
issues. We expect that the catalog of issues developed at this step will also
help us later to identify the severity, root causes, and possible remedy for
quality issues of MLSSs, allowing us to develop efficient quality assurance
tools for ML models and MLSSs.
|
[
{
"version": "v1",
"created": "Thu, 18 Aug 2022 17:55:18 GMT"
},
{
"version": "v2",
"created": "Mon, 22 Aug 2022 17:43:10 GMT"
}
] | 2022-08-23T00:00:00
|
[
[
"Côté",
"Pierre-Olivier",
""
],
[
"Nikanjam",
"Amin",
""
],
[
"Bouchoucha",
"Rached",
""
],
[
"Khomh",
"Foutse",
""
]
] |
"6lkIfIgjOEzRCfpXHWkcayz9AeZcp8OhRlVy8jP9/BzEcBI9SsptGmSPG7tfcKSvhUe5LDmOCE+rummpYUS7iKWUKORZz1C4BrwSbNqicI2pORXgFqOaDUuX/RqOID/I7qsX9ZDmj3yn1J90Z2+UC53QnCh/UjJVHEtQCJGLZr8="
|
math/0202068
|
Reidun Twarock
|
P.N. Pyatov and R. Twarock
|
Construction of Diffusion Algebras
|
(13 pages, submitted to J. Math. Phys.)
| null |
10.1063/1.1473220
| null |
math.QA cond-mat.stat-mech
| null |
In cond-mat/0103603 Diffusion algebras have been introduced in the context of
one-dimensional stochastic processes with exclusion in statistical mechanics.
While this reference is focused on the needs of the physicist reader and thus
states results without proofs and focuses on the discussion of
lower-dimensional examples, it is the purpose of this paper to present a
construction formalism for Diffusion algebras and to use the latter to prove
the results in that reference.
|
[
{
"version": "v1",
"created": "Fri, 8 Feb 2002 18:33:09 GMT"
}
] | 2015-06-26T00:00:00
|
[
[
"Pyatov",
"P. N.",
""
],
[
"Twarock",
"R.",
""
]
] |
"6HkYfoqhGVrYcNl75XL8809r5HQUBrONVldh6Z9/9RjfYAtZaGZNWEwTOu2xgLFn0g35A2uMWAWQ4nygUEg/QDsW48QTx1GeFJ9waPEudtmf/TXA4YEoLoybstYOBEiYjqe1nlrvhu/mRZ/uIubHI83a3St+SKI0T2KcT/saF7g="
|
1506.06213
|
Walaa Hamouda
|
Abdelmohsen Ali and Walaa Hamouda
|
Spectrum Monitoring Using Energy Ratio Algorithm For OFDM-Based
Cognitive Radio Networks
| null | null | null | null |
cs.IT cs.NI math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper presents a spectrum monitoring algorithm for Orthogonal Frequency
Division Multiplexing (OFDM) based cognitive radios by which the primary user
reappearance can be detected during the secondary user transmission. The
proposed technique reduces the frequency with which spectrum sensing must be
performed and greatly decreases the elapsed time between the start of a primary
transmission and its detection by the secondary network. This is done by
sensing the change in signal strength over a number of reserved OFDM
sub-carriers so that the reappearance of the primary user is quickly detected.
Moreover, the OFDM impairments such as power leakage, Narrow Band Interference
(NBI), and Inter-Carrier Interference (ICI) are investigated and their impact
on the proposed technique is studied. Both analysis and simulation show that
the \emph{energy ratio} algorithm can effectively and accurately detect the
appearance of the primary user. Furthermore, our method achieves high immunity
to frequency-selective fading channels for both single and multiple receive
antenna systems, with a complexity that is approximately twice that of a
conventional energy detector.
|
[
{
"version": "v1",
"created": "Sat, 20 Jun 2015 09:07:11 GMT"
}
] | 2015-06-23T00:00:00
|
[
[
"Ali",
"Abdelmohsen",
""
],
[
"Hamouda",
"Walaa",
""
]
] |
"cPgETonh0B5+WYJUP3Lz82y5U3SA9NviGFMT+R3+9lzjYMLd+pRtDq4Hu/E28K3vFB/3S12oOgwJgFIkY149lEmGisS6xHSGp3goadomOyW7WT2gboDioky6ohCZpa6YjAEVv+KEjGyAQLtjoOZHsVXSmjh/d/IfTmtW31MOf54="
|
2501.05345
|
Matthew Brehmer
|
Matthew Brehmer
|
Video-Conferencing Beyond Screen-Sharing and Thumbnail Webcam Videos:
Gesture-Aware Augmented Reality Video for Data-Rich Remote Presentations
|
Position paper for the ACM GROUP '25 Workshop on "Beyond
Video-Conferencing": Telepresence Technologies for Extending Expertise Reach
and Specialised Skill Sharing, January 12, 2025 in Hilton Head Island, South
Carolina
| null | null | null |
cs.HC
|
http://creativecommons.org/licenses/by/4.0/
|
Synchronous data-rich conversations are commonplace within enterprise
organizations, taking place at varying degrees of formality between
stakeholders at different levels of data literacy. In these conversations,
representations of data are used to analyze past decisions, inform future
course of action, as well as persuade customers, investors, and executives.
However, it is difficult to conduct these conversations between remote
stakeholders due to poor support for presenting data when video-conferencing,
resulting in disappointing audience experiences. In this position statement, I
reflect on our recent work incorporating multimodal interaction and augmented
reality video, suggesting that video-conferencing does not need to be limited
to screen-sharing and relegating a speaker's video to a separate thumbnail
view. I also comment on future research directions and collaboration
opportunities.
|
[
{
"version": "v1",
"created": "Thu, 9 Jan 2025 16:21:12 GMT"
}
] | 2025-01-10T00:00:00
|
[
[
"Brehmer",
"Matthew",
""
]
] |
"2N8MfohmojqlovKT1UiVGwTz18lUO3ORdkVifnV+q5zFEAsdckRNmAQGOmr25bSj01rxQzOMmkeZqkwJdNFhgHsUO8DaxUyMADlALJZ2VByhPxXwEKyuKZ6R5BoPRXqYzNs3vfCiC/YvxFN1B+UGC4//Cq57SJDgTctU3RqbKqM="
|
2011.10282
|
Hang Liu
|
Hang Liu, Xiaojun Yuan, Ying-Jun Angela Zhang
|
Reconfigurable Intelligent Surface Enabled Federated Learning: A Unified
Communication-Learning Design Approach
|
Simulation codes are available at
https://github.com/liuhang1994/RIS-FL. This work has been accepted by IEEE
Transactions on Wireless Communications
| null | null | null |
cs.IT cs.LG cs.NI eess.SP math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
To exploit massive amounts of data generated at mobile edge networks,
federated learning (FL) has been proposed as an attractive substitute for
centralized machine learning (ML). By collaboratively training a shared
learning model at edge devices, FL avoids direct data transmission and thus
overcomes high communication latency and privacy issues as compared to
centralized ML. To improve the communication efficiency in FL model
aggregation, over-the-air computation has been introduced to support a large
number of simultaneous local model uploading by exploiting the inherent
superposition property of wireless channels. However, due to the heterogeneity
of communication capacities among edge devices, over-the-air FL suffers from
the straggler issue in which the device with the weakest channel acts as a
bottleneck of the model aggregation performance. This issue can be alleviated
by device selection to some extent, but the latter still suffers from a
tradeoff between data exploitation and model communication. In this paper, we
leverage the reconfigurable intelligent surface (RIS) technology to relieve the
straggler issue in over-the-air FL. Specifically, we develop a learning
analysis framework to quantitatively characterize the impact of device
selection and model aggregation error on the convergence of over-the-air FL.
Then, we formulate a unified communication-learning optimization problem to
jointly optimize device selection, over-the-air transceiver design, and RIS
configuration. Numerical experiments show that the proposed design achieves
substantial learning accuracy improvement compared with the state-of-the-art
approaches, especially when channel conditions vary dramatically across edge
devices.
|
[
{
"version": "v1",
"created": "Fri, 20 Nov 2020 08:54:13 GMT"
},
{
"version": "v2",
"created": "Tue, 8 Dec 2020 14:59:36 GMT"
},
{
"version": "v3",
"created": "Fri, 19 Mar 2021 09:25:59 GMT"
},
{
"version": "v4",
"created": "Tue, 1 Jun 2021 14:47:11 GMT"
}
] | 2024-10-30T00:00:00
|
[
[
"Liu",
"Hang",
""
],
[
"Yuan",
"Xiaojun",
""
],
[
"Zhang",
"Ying-Jun Angela",
""
]
] |
"XPtIPozsEgrYPdI9rUHnYSY7A/fEsdLTWFcybjd//Fjl5Aud8NRtWgwGC/kEV6Ln1161Cz2MGmm4yF2tc0Q9QEESIFB4w0SklpCAqN9nAG2APz/IfgGqrVyb4poaDbyprKgV1bqun3KHIL95ZWWGl8/+Eyx/d/NFSEtWntsSXr0="
|
cond-mat/9711204
|
Sebastian Eggert
|
Ann E. Mattsson, Sebastian Eggert, Henrik Johannesson (Chalmers TH,
Gothenburg, Sweden)
|
Properties of a Luttinger Liquid with Boundaries at Finite Temperature
and Size
|
18 pages in revtex format including 5 embedded figures (using epsf).
The latest complete postscript file is available from
http://fy.chalmers.se/~eggert/papers/longlutt.ps or by request from
eggert@fy.chalmers.se. To appear in Phys. Rev. B (Dec. 1997)
|
Phys. Rev. B56, p.15615 (1997).
|
10.1103/PhysRevB.56.15615
| null |
cond-mat.str-el
| null |
We use bosonization methods to calculate the exact finite-temperature
single-electron Green's function of a spinful Luttinger liquid confined by open
boundaries. The corresponding local spectral density is constructed and
analyzed in detail. The interplay between boundary, finite-size and thermal
effects are shown to dramatically influence the low-energy properties of the
system. In particular, the well-known zero-temperature critical behavior in the
bulk always crosses over to a boundary dominated regime in the vicinity of the
Fermi level. Thermal fluctuations cause an enhanced depletion of spectral
weight for small energies E, with the spectral density scaling as E^2 for E
much less than the temperature. Consequences for photoemission experiments are
discussed.
|
[
{
"version": "v1",
"created": "Thu, 20 Nov 1997 08:05:49 GMT"
}
] | 2009-10-30T00:00:00
|
[
[
"Mattsson",
"Ann E.",
"",
"Chalmers TH,\n Gothenburg, Sweden"
],
[
"Eggert",
"Sebastian",
"",
"Chalmers TH,\n Gothenburg, Sweden"
],
[
"Johannesson",
"Henrik",
"",
"Chalmers TH,\n Gothenburg, Sweden"
]
] |
"OmmAXjarm2LYCAB5h3DYs60rfbTIrsNFRBcOeSl+eVnE0Vp5WGRJOgaPO7GQcqWjwwrxa2A8SkGpPV+g2Ug1ajG26PEW51O0HjEAaHcmANjBXIwIWUqpPAepNtoMKrwpjj5lj/4jh/72lf7v76YFiozadid8GcMwS5rSjHgTCrg="
|
1809.00487
|
Toshikazu Shigeyama
|
Toshikazu Shigeyama and Kazumi Kashiyama
|
Repulsion of fallback matter due to central energy source in supernova
|
18 pages, 5 figures, 1 table, PASJ accepted
| null |
10.1093/pasj/psy108
| null |
astro-ph.SR astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The flow of fallback matter being shocked and repelled back by an energy
deposition from a central object is discussed by using newly found self-similar
solutions. We show that there exists a maximum mass accretion rate if the
adiabatic index of the flow is less than or equal to 4/3. Otherwise we can find
a solution with an arbitrarily large accretion rate by appropriately shrinking
the energy deposition region. Applying the self-similar solution to supernova
fallback, we discuss how the fate of newborn pulsars or magnetars depends on
the fallback accretion and their spin-down power. Combining the condition for
the fallback accretion to bury the surface magnetic field into the crust, we
argue that supernova fallback with a rate of dM_{fb}/dt ~ 10^{-(4-6)} M_sun /s
could be the main origin of the diversity of Galactic young neutron stars,
i.e., rotation-powered pulsars, magnetars, and central compact objects.
|
[
{
"version": "v1",
"created": "Mon, 3 Sep 2018 08:24:27 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Sep 2018 06:31:03 GMT"
}
] | 2018-10-17T00:00:00
|
[
[
"Shigeyama",
"Toshikazu",
""
],
[
"Kashiyama",
"Kazumi",
""
]
] |
"8EiAfLqnis5R3Os3FWP0ym/rZESwn5MNQsNunZvktxTA3ChleixJcyaeWyH4QrTqsAy8h3esXtwJJh8k2UAJhXGQqUQTx1H2HDmkafakEnHR3k4Aa4EorL2Krh2PBDyIGh83nQsUgV/iZY9ptWZUJ83bvYx3VrPkSBPcBLAcpno="
|
2004.11795
|
Xiaonan Li
|
Xiaonan Li, Hang Yan, Xipeng Qiu, Xuanjing Huang
|
FLAT: Chinese NER Using Flat-Lattice Transformer
|
Accepted to the ACL 2020
| null | null | null |
cs.CL
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently, the character-word lattice structure has been proved to be
effective for Chinese named entity recognition (NER) by incorporating the word
information. However, since the lattice structure is complex and dynamic, most
existing lattice-based models are hard to fully utilize the parallel
computation of GPUs and usually have a low inference-speed. In this paper, we
propose FLAT: Flat-LAttice Transformer for Chinese NER, which converts the
lattice structure into a flat structure consisting of spans. Each span
corresponds to a character or latent word and its position in the original
lattice. With the power of Transformer and well-designed position encoding,
FLAT can fully leverage the lattice information and has an excellent
parallelization ability. Experiments on four datasets show FLAT outperforms
other lexicon-based models in performance and efficiency.
|
[
{
"version": "v1",
"created": "Fri, 24 Apr 2020 15:27:49 GMT"
},
{
"version": "v2",
"created": "Sat, 23 May 2020 05:05:03 GMT"
}
] | 2020-06-01T00:00:00
|
[
[
"Li",
"Xiaonan",
""
],
[
"Yan",
"Hang",
""
],
[
"Qiu",
"Xipeng",
""
],
[
"Huang",
"Xuanjing",
""
]
] |
"LuAM/simHN5IAWMbXUPVi3B5ZdmUFaiD1mNzTn1/ORzG8EEBWVNt2A4Ne6XP4KSnxU75tzGMlmmJMUy5UUg5SROaI0RxykaIBLEE6pYmdEn3fJXKArX0PIqD/YsZBTuhTq+3Cb4KT3yyQPdqJ05UG43qTC9/UqLJZIJUHqFqzrw="
|
1701.01273
|
Miguel Angel Javaloyes
|
Miguel Angel Javaloyes and Miguel S\'anchez
|
Wind Riemannian spaceforms and Randers metrics of constant flag
curvature
|
17 pages, 4 figures
|
Eur. J. Math. 3 (2017), 1225-1244
|
10.1007/s40879-017-0186-9
| null |
math.DG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently, wind Riemannian structures (WRS) have been introduced as a
generalization of Randers and Kropina metrics. They are constructed from the
natural data for Zermelo navigation problem, namely, a Riemannian metric $g_R$
and a vector field $W$ (the wind), where, now, the restriction of mild wind
$g_R(W,W)<1$ is dropped.
Here, the models of WRS spaceforms of constant flag curvature are determined.
Indeed, the celebrated classification of Randers metrics of constant flag
curvature by Bao, Robles and Shen, extended to the Kropina case in the works by
Yoshikawa, Okubo and Sabau, can be used to obtain the local classification. For
the global one, a suitable result on completeness for WRS yields the complete
simply connected models. In particular, any of the local models in the Randers
classification does admit an extension to a unique model of wind Riemannian
structure, even if it cannot be extended as a complete Finslerian manifold.
Thus, WRS's emerge as the natural framework for the analysis of Randers
spaceforms and, prospectively, wind Finslerian structures would become
important for other global problems too. For the sake of completeness, a brief
overview about WRS (including a useful link with the conformal geometry of a
class of relativistic spacetimes) is also provided.
|
[
{
"version": "v1",
"created": "Thu, 5 Jan 2017 10:47:06 GMT"
}
] | 2018-05-22T00:00:00
|
[
[
"Javaloyes",
"Miguel Angel",
""
],
[
"Sánchez",
"Miguel",
""
]
] |
"z3sMfgKzC8hZFNPTfVPlUW9rYmI1L1MpRVdjT53//lgoSEplCgjN3iyHu6WVwajC4A91j0OMPkUd4V6pSEhNGFMYgMVRQlewGPwkSMdmHG2BehVgb4A5vaypAt+/AKypkbHn/5JzjQ/mw5956m9GYweLhgV3zfPgKF/WNDQKrjo="
|
2201.10008
|
Andreia Fonseca Silva
|
Andreia F Silva, Tiffany A Wood, Daniel J M Hodgson, John R Royer, Job
H J Thijssen, Alex Lips, Wilson C K Poon
|
Rheological design of thickened alcohol-based hand rubs
|
10 pages, 8 figures
| null |
10.1007/s00397-022-01347-y
| null |
cond-mat.soft
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The handleability and sensory perception of hand sanitisers by consumers
affect the hygiene outcome. Spillage may result in under-dosing and poor
sensory properties can lead to under-utilisation. We first propose four
principles (low run off, spreadability, smoothness and non-stickiness) for
designing the rheology of thickened alcohol-based hand rubs with acceptable
handleability and hand feel. We then evaluate a commercial hand gel and a
variety of simplified formulations thickened with microgels (Carbopol 974P,
Carbopol Ultrez 20 and Sepimax Zen), or linear polymers (Jaguar HP 120 COS),
and evaluate them against these design criteria. All four additives provide
acceptable spreadability by shear thinning to $\eta \approx 10^{-1} Pa \, s$ at
$\dot\gamma \sim 10^3 s^{-1}$. Either the finite yield stress conferred by the
microgels ($\sigma_y \gtrsim 10 Pa$) or the increase in low-shear viscosity
provided by the linear polymer ($\eta \gtrsim 1 Pa \, s$ at $\dot\gamma
\lesssim 0.1 s^{-1}$) give rise to acceptably low run-off. However, the
formulation using the linear polymer shows a filament breakage time of
$\tau_{\rm b} \approx 1 s$ in capillary rheology, which may result in
stickiness and therefore a less than optimal hand feel.
|
[
{
"version": "v1",
"created": "Mon, 24 Jan 2022 23:46:44 GMT"
},
{
"version": "v2",
"created": "Thu, 5 May 2022 10:42:01 GMT"
}
] | 2023-03-27T00:00:00
|
[
[
"Silva",
"Andreia F",
""
],
[
"Wood",
"Tiffany A",
""
],
[
"Hodgson",
"Daniel J M",
""
],
[
"Royer",
"John R",
""
],
[
"Thijssen",
"Job H J",
""
],
[
"Lips",
"Alex",
""
],
[
"Poon",
"Wilson C K",
""
]
] |
"9lGITICmOVzIHHX5f3M98y51LFUVq7PLRAYwQtX/xR2dlAscdURIXGaF6Wj0k6DjRAfZBcmMHp+p6G+8aGQJEX0VIKQT9XSWHDeibLi0HtCxfJxgY6KbLYm0vVvMBDapSLInFuK6jtDaRcdtJieEAs3YnS19LxRtTeGUkx3aHjA="
|
2507.17859
|
Lyes Saad Saoud Dr
|
Muayad Abujabal, Lyes Saad Saoud, and Irfan Hussain
|
FishDet-M: A Unified Large-Scale Benchmark for Robust Fish Detection and CLIP-Guided Model Selection in Diverse Aquatic Visual Domains
| null | null | null | null |
cs.CV cs.RO
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
Accurate fish detection in underwater imagery is essential for ecological monitoring, aquaculture automation, and robotic perception. However, practical deployment remains limited by fragmented datasets, heterogeneous imaging conditions, and inconsistent evaluation protocols. To address these gaps, we present \textit{FishDet-M}, the largest unified benchmark for fish detection, comprising 13 publicly available datasets spanning diverse aquatic environments including marine, brackish, occluded, and aquarium scenes. All data are harmonized using COCO-style annotations with both bounding boxes and segmentation masks, enabling consistent and scalable cross-domain evaluation. We systematically benchmark 28 contemporary object detection models, covering the YOLOv8 to YOLOv12 series, R-CNN based detectors, and DETR based models. Evaluations are conducted using standard metrics including mAP, mAP@50, and mAP@75, along with scale-specific analyses (AP$_S$, AP$_M$, AP$_L$) and inference profiling in terms of latency and parameter count. The results highlight the varying detection performance across models trained on FishDet-M, as well as the trade-off between accuracy and efficiency across models of different architectures. To support adaptive deployment, we introduce a CLIP-based model selection framework that leverages vision-language alignment to dynamically identify the most semantically appropriate detector for each input image. This zero-shot selection strategy achieves high performance without requiring ensemble computation, offering a scalable solution for real-time applications. FishDet-M establishes a standardized and reproducible platform for evaluating object detection in complex aquatic scenes. All datasets, pretrained models, and evaluation tools are publicly available to facilitate future research in underwater computer vision and intelligent marine systems.
|
[
{
"version": "v1",
"created": "Wed, 23 Jul 2025 18:32:01 GMT"
}
] | 2025-07-25T00:00:00
|
[
[
"Abujabal",
"Muayad",
""
],
[
"Saoud",
"Lyes Saad",
""
],
[
"Hussain",
"Irfan",
""
]
] |
"wM6Me4irEEptidLR/UP0e0Q5Q1bWP/lFHEdmerl++VzC0ARZ1BhteAaXWzk30zbnYU6kHz0pmmshplmFYWgpEAEaKNBTwla4EbrI7f42eE2BPRjCdgC6nJuX6ZsKrD6AjrdXubaSjejGRbd55meEu8+nnql9fLNlXApUD7x/Di8="
|
2107.00349
|
Vjosa Preniqi
|
Vjosa Preniqi, Kyriaki Kalimeri, Charalampos Saitis
|
Modelling Moral Traits with Music Listening Preferences and Demographics
| null | null | null | null |
cs.CY
|
http://creativecommons.org/licenses/by/4.0/
|
Music is an essential component in our everyday lives and experiences, as it
is a way that we use to express our feelings, emotions and cultures. In this
study, we explore the association between music genre preferences, demographics
and moral values by exploring self-reported data from an online survey
administered in Canada. Participants filled in the moral foundations
questionnaire, while they also provided their basic demographic information,
and music preferences. Here, we predict the moral values of the participants
inferring on their musical preferences employing classification and regression
techniques. We also explored the predictive power of features estimated from
factor analysis on the music genres, as well as the generalist/specialist (GS)
score for revealing the diversity of musical choices for each user. Our results
show the importance of music in predicting a person's moral values (.55-.69
AUROC); while knowledge of basic demographic features such as age and gender is
enough to increase the performance (.58-.71 AUROC).
|
[
{
"version": "v1",
"created": "Thu, 1 Jul 2021 10:26:29 GMT"
}
] | 2021-07-02T00:00:00
|
[
[
"Preniqi",
"Vjosa",
""
],
[
"Kalimeri",
"Kyriaki",
""
],
[
"Saitis",
"Charalampos",
""
]
] |
"Y+oNfoiGLtqAMnK37WqVaXxlS+FUn6NDZldyALf/dt3n8BitYk11mSaWeXM3WzWrwRrsRx2sisstn14p4Fn5imW2Ioh91kOMA7uoKJYmltU9LRXgM6CafpiJ6UoJR37Zxfo1ff7Yj+vDXNdkTYxUCx2q3CZ/YdOcSLrWijQKHjQ="
|
1807.09053
|
Francesco Pisacane
|
Gaetano Fiore, Francesco Pisacane
|
New fuzzy spheres through confining potentials and energy cutoffs
|
Latex file, 13 pages, 2 figures. Contribution to the proceedings of
the Corfu Summer Institute "School and Workshops on Elementary Particle
Physics and Gravity", 2-28 September 2017, Corfu, Greece. Version 3: some
misprints in the published version are corrected
|
Proceedings of Science Volume 318 (2018)
|
10.22323/1.318.0184
| null |
math-ph hep-th math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We briefly report our recent construction of new fuzzy spheres of dimensions
d=1,2 covariant under the full orthogonal group O(D), D=d+1. They are built by
imposing a suitable energy cutoff on a quantum particle in D dimensions subject
to a confining potential well V(r) with a very sharp minimum on the sphere of
radius r=1; furthermore, the cutoff and the depth of the well depend on (and
diverge with) a natural number L. The commutator of the coordinates depends
only on the angular momentum, as in Snyder noncommutative spaces. When L
diverges, the Hilbert space dimension diverges, too; S^d_L converges to S^d,
and we recover ordinary quantum mechanics on S^d. These models might be useful
in quantum field theory, quantum gravity or condensed matter physics.
|
[
{
"version": "v1",
"created": "Tue, 24 Jul 2018 12:00:46 GMT"
},
{
"version": "v2",
"created": "Fri, 17 Aug 2018 11:49:51 GMT"
},
{
"version": "v3",
"created": "Thu, 19 Dec 2019 19:43:34 GMT"
}
] | 2019-12-23T00:00:00
|
[
[
"Fiore",
"Gaetano",
""
],
[
"Pisacane",
"Francesco",
""
]
] |
"+3McfoLhmO5QEBPz91Lc+2l7dlSUx9MNVFdifR3/p1xsSBpdSg1t2m6FOuQww6XqoC7Rx3WMfm0IvvqgWAlVBGGcocAXZ1K8HHggbDsmFP2feDxAaIjtKA254g4PJayInLWnvd6tic/mRB/pIm7GIUTaxAF+zYNwKdLUPna+iro="
|
2412.09931
|
Daniel Brunner
|
Daniel Brunner
|
Reviving holographic photonic integration
| null |
Reviving holographic photonic integration, Nature Photonic 18, 402
(2024)
|
10.1038/s41566-024-01432-z
| null |
physics.optics
|
http://creativecommons.org/licenses/by/4.0/
|
Photonic integration of thick holograms in waveguiding structures could be
considered the chimera of photonics; multi-faceted and hard to tame. It is the
fundamental, and hence indispensable, concept behind compact and monolithically
integrated linear optical transformation1. The true relevance of this becomes
apparent in the high-dimensional context of unconventional optical computing,
that is, in optical neural networks. Yet, integrating such holographic
connections is very challenging. It demands high fabrication accuracy, and
numerical design of the circuit is often non-tractable for large architectures.
Both challenges are intrinsically linked to the usually large refractive index
differences between sections of such holographic optical waveguides when using
standard techniques of silicon photonics.
|
[
{
"version": "v1",
"created": "Fri, 13 Dec 2024 07:32:22 GMT"
}
] | 2024-12-16T00:00:00
|
[
[
"Brunner",
"Daniel",
""
]
] |
"kFOAbYSOFwqwyBW/dTFwuqXzc0VUI+HfUdMPOn1keFBk4E6dYQBtWmYXeews06FHQmj143WMOo0sDH1hKhk1GIOUosIT4VbGAD6AbNZnNXmM/YSADUz6P8yd6NuoBJu4rj61/eryj+PyJIdhJO+HDw3WOIl/2uJoR8PUvkp7Dj4="
|
1109.5517
|
Antoni Szczurek
|
Rafal Maciula, Roman Pasechnik and Antoni Szczurek
|
New contributions to central exclusive production of dijets in
proton-(anti)proton collisions
|
20 pages, 14 figures
| null |
10.1103/PhysRevD.84.114014
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider central exclusive production of $gg$ dijets in proton-proton
(proton-antiproton) collisions at LHC and Tevatron for different intermediate
and final gluon polarisations. The amplitude for the process is derived within
the $k_\perp$-factorization approach (with both the standard QCD and the
Lipatov's effective three-gluon verticies) and is considered in various
kinematical asymptotia, in particular, in the important limit of high-$p_\perp$
jets. Compared to earlier works we include emissions of gluons from different
gluonic $t$-channel lines as well as emission of quark-antiquark dijets.
Rapidity distributions, gluon jet $p_\perp$ distributions and invariant dijet
mass distributions are presented. We explore the competition of the standard
diagram with both jets emitted from a single $t$-channel gluon and the one with
the emission from both $t$-channel gluons. The second mechanism requires a
special treatment. We propose two different approaches. Including special
kinematics and using properties of off-diagonal gluons at small $x$ and $\xi$
we arrive to correlations in two-dimensional distributions in rapidity of one
and second jet. We find that the second contribution is much smaller than that
known from the literature. The digluon production constitutes an important
background to exclusive Higgs production.
|
[
{
"version": "v1",
"created": "Mon, 26 Sep 2011 10:10:36 GMT"
}
] | 2015-05-30T00:00:00
|
[
[
"Maciula",
"Rafal",
""
],
[
"Pasechnik",
"Roman",
""
],
[
"Szczurek",
"Antoni",
""
]
] |
"sVkZ/QykkI5QVdLTfGKscyXLVFGUn7+dRPcru4HjJXy4SUvZUwZFkkySaavw65Gz8JzsJ3+kHk8JMn2ocWo9HZsSqMQZ7VKylDhMqPonGGGZXg+AaoD4PYyK5N28MdiJgDO2NquTB8/Whb/5tsbCg5LK3ot3bpJiy0LYHagcc6o="
|
astro-ph/9909324
|
Tsutomu Takeuchi
|
Tsutomu T. Takeuchi (1) (Department of Astronomy, Kyoto University)
|
Application of the Information Criterion to the Estimation of Galaxy
Luminosity Function
|
16 pages LaTeX, no figure, accepted by ApSS
|
Astrophys.Space Sci. 271 (2000) 213-226
|
10.1023/A:1002438524580
| null |
astro-ph
| null |
To determine the exact shape of the luminosity function (LF) of galaxies is
one of the central problems in galactic astronomy and observational cosmology.
The most popular method to estimate the LF is maximum likelihood, which is
clearly understood with the concepts of the information theory. In the field of
information theory and statistical inference, great advance has been made by
the discovery of Akaike's Information Criterion (AIC). It enables us to perform
a direct comparison among different types of models with different numbers of
parameters, and provides us a common basis of the model adequacy. In this paper
we applied AIC to the determination of the shape of the LF. We first treated
the estimation using stepwise LF, and derived a formula to obtain the optimal
bin number. In addition, we studied the method to compare the goodness-of-fit
of the parametric form with stepwise LF.
|
[
{
"version": "v1",
"created": "Sun, 19 Sep 1999 18:20:54 GMT"
}
] | 2009-10-31T00:00:00
|
[
[
"Takeuchi",
"Tsutomu T.",
""
]
] |
"4WAIfprkmPrYHWtfffLceUWJQFCUvzBDVnf7T7/NvVzCUCNVY2xNii6WG3Fc9azj4A41t1WMHs8pHHup0UA9DRuYocR5z0O8ErqkafsiMP3BvxeAZ4C6LJ0Op94rJByJ0CM3vPS8hX+0xfviKIfFQ87Tnqh+FJJ0TFPcCqK4ajQ="
|
2003.10169
|
Hari K
|
Hari K and Dawood Kothawala
|
Normal coordinates based on curved tangent space
|
13 pages, 4 figures, comments added and typos fixed, matches version
accepted in Phys. Rev. D
|
Phys. Rev. D 101, 124066 (2020)
|
10.1103/PhysRevD.101.124066
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Riemann normal coordinates (RNC) at a regular event $p_0$ of a spacetime
manifold $\mathcal{M}$ are constructed by imposing: (i)
$g_{\textsf{ab}}|_{p_0}=\eta_{ab}$, and (ii)
$\Gamma^\textsf{a}_{\phantom{\textsf a}\textsf{bc}}|_{p_0}=0$. There is,
however, a third, $independent$, assumption in the definition of RNC which
essentially fixes the $density$ $of$ $geodesics$ emanating from $p_0$ to its
value in flat spacetime, viz.: (iii) the tangent space
$\mathcal{T}_{p_0}(\mathcal{M})$ is $flat$. We relax (iii) and obtain the
normal coordinates, along with the metric $g_{\textsf{ab}}$, when
$\mathcal{T}_{p_0}(\mathcal{M})$ is a maximally symmetric manifold
$\widetilde{\mathcal M}_{\Lambda}$ with curvature length $|\Lambda|^{-1/2}$. In
general, the "rest" frame defined by these coordinates is non-inertial with an
additional acceleration $\boldsymbol a = - ({\Lambda}/3) \, \boldsymbol x$
depending on the curvature of tangent space. Our geometric set-up provides a
convenient probe of local physics in a universe with a cosmological constant
$\Lambda$, now embedded into the local structure of spacetime as a fundamental
constant associated with a curved tangent space. We discuss classical and
quantum implications of the same.
|
[
{
"version": "v1",
"created": "Mon, 23 Mar 2020 10:36:12 GMT"
},
{
"version": "v2",
"created": "Mon, 8 Jun 2020 06:40:02 GMT"
}
] | 2020-06-30T00:00:00
|
[
[
"K",
"Hari",
""
],
[
"Kothawala",
"Dawood",
""
]
] |
"5WEcfhrFqDLwVPL7ZUP08WdLUtC0vxMtQJcj77UvplxGWAsxT81N3i6dG6Xw5bnjwJzVS2eEHk8JIF7oUEAdAvm1oYUTY3qYGD0ueNdkBHvJXT7gaYjprj0LylKrBLyIoKN3v8Z8jr/ywZ/z6u5GA0bbzsx33dFgKB/cPCqavqo="
|
1908.09567
|
Eirik Berge
|
Eirik Berge
|
$\alpha$-modulation spaces for step two stratified Lie groups
| null | null | null | null |
math.FA math.MG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We define and investigate $\alpha$-modulation spaces $M_{p,q}^{s,\alpha}(G)$
associated to a step two stratified Lie group $G$ with rational structure
constants. This is an extension of the Euclidean $\alpha$-modulation spaces
$M_{p,q}^{s,\alpha}(\mathbb{R}^n)$ that act as intermediate spaces between the
modulation spaces ($\alpha = 0$) in time-frequency analysis and the Besov
spaces ($\alpha = 1$) in harmonic analysis. We will illustrate that the the
group structure and dilation structure on $G$ affect the boundary cases $\alpha
= 0,1$ where the spaces $M_{p,q}^{s}(G)$ and $\mathcal{B}_{p,q}^{s}(G)$ have
non-standard translation and dilation symmetries. Moreover, we show that the
spaces $M_{p,q}^{s,\alpha}(G)$ are non-trivial and generally distinct from
their Euclidean counterparts. Finally, we examine how the metric geometry of
the coverings $\mathcal{Q}(G)$ underlying the $\alpha = 0$ case
$M_{p,q}^{s}(G)$ allows for the existence of geometric embeddings
\[F:M_{p,q}^{s}(\mathbb{R}^k) \longrightarrow{} M_{p,q}^{s}(G),\] as long as
$k$ (that only depends on $G$) is small enough. Our approach naturally gives
rise to several open problems that is further elaborated at the end of the
paper.
|
[
{
"version": "v1",
"created": "Mon, 26 Aug 2019 09:45:24 GMT"
}
] | 2019-08-27T00:00:00
|
[
[
"Berge",
"Eirik",
""
]
] |
"zXuIPqrDKcTYUtLT9VP0c2Q9Ykc0n7Mp1Vdm3bz/9VzI6FtNSkRFyK6He+WUwanmwA7zx2usXkuNrVzgSFg9QBm/oMBSxlSQGNk8LWRiNrmfuz3o5ohrL4yJoo4ZBK6hiLb3idC5ja/Cx5FtJu9GY9fKlKx22eH0KDPEOjIKirg="
|
hep-ph/0310081
|
Robert Fleischer
|
Robert Fleischer (CERN)
|
New Strategies to Extract Weak Phases from Neutral B Decays
|
8 pages, LaTeX, invited talk at the HEP2003 Europhysics Conference,
Aachen, Germany, 17-23 July 2003, to appear in the proceedings
|
Eur.Phys.J.C33:s268-s270,2004
|
10.1140/epjcd/s2003-03-130-5
|
CERN-TH/2003-241
|
hep-ph
| null |
We discuss new, theoretically clean strategies to determine the angle
$\gamma$ of the unitarity triangle from $B_d\to DK_{S(L)}$, $B_s\to
D\eta^{(')}, D\phi, ...$ decays, and point out that the $B_s\to DK_{S(L)}$ and
$B_d\to D\pi^0, D\rho^0, ...$ modes allow very interesting determinations of
the $B^0_q$--$\bar{B^0_q}$ mixing phases $\phi_s$ and $\phi_d$, respectively.
Their colour-allowed counterparts $B_s\to D_s^{(*)\pm} K^\mp, ...$ and $B_d\to
D^{(*)\pm} \pi^\mp, ...$ also offer new methods to probe $\gamma$.
|
[
{
"version": "v1",
"created": "Tue, 7 Oct 2003 10:35:37 GMT"
}
] | 2010-11-23T00:00:00
|
[
[
"Fleischer",
"Robert",
"",
"CERN"
]
] |
"kGjdfq7AGEjCFVf2dUL0vUQLFEx8vJIJUNJi35H/rVx82Bp9WiRtnGSVO6FwwTXi8O/1VVasDN2gsl+kUWo9A4mcgMQabFG+FKhFbOukKHCBfw+gYoAoPSwiZ68MJJ6IwiP3verxBevmFZ9/t+ZEi1ba2ql+BNN0bNLUjAo6V7w="
|
hep-ph/0603081
|
Thomas Konstandin
|
Thomas Konstandin, Stephan J. Huber
|
Numerical Approach to Multi Dimensional Phase Transitions
|
18 pages, 8 figures; some comments, a reference and a table added
|
JCAP 0606 (2006) 021
|
10.1088/1475-7516/2006/06/021
|
CERN-PH-TH/2006-041
|
hep-ph
| null |
We present an algorithm to analyze numerically the bounce solution of
first-order phase transitions. Our approach is well suited to treat phase
transitions with several fields. The algorithm consists of two parts. In the
first part the bounce solution without damping is determined, in which case
energy is conserved. In the second part the continuation to the physically
relevant case with damping is performed. The presented approach is numerically
stable and easily implemented.
|
[
{
"version": "v1",
"created": "Fri, 10 Mar 2006 10:06:09 GMT"
},
{
"version": "v2",
"created": "Thu, 22 Jun 2006 06:42:18 GMT"
}
] | 2009-11-11T00:00:00
|
[
[
"Konstandin",
"Thomas",
""
],
[
"Huber",
"Stephan J.",
""
]
] |
"cHkIfgihmY/4kFv/dVHcW03rdPSQn7ONRFMzaTF+/V1MSBp8agxNWGaHc+jxw7XjkB/541MsTk0IOn1oUgAVRH0c4dQXT1auGD2EaHliJMyB9h8IKcGprbkrotkJAegIt6e1v++jh+/iJZ9pouYVB9/e/Ab3TPLSLIvUHDoSDno="
|
1803.11173
|
Jarrod McClean
|
Jarrod R. McClean, Sergio Boixo, Vadim N. Smelyanskiy, Ryan Babbush,
Hartmut Neven
|
Barren plateaus in quantum neural network training landscapes
| null |
Nature Communications, Volume 9, Article Number: 4812 (2018)
|
10.1038/s41467-018-07090-4
| null |
quant-ph cs.LG physics.chem-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Many experimental proposals for noisy intermediate scale quantum devices
involve training a parameterized quantum circuit with a classical optimization
loop. Such hybrid quantum-classical algorithms are popular for applications in
quantum simulation, optimization, and machine learning. Due to its simplicity
and hardware efficiency, random circuits are often proposed as initial guesses
for exploring the space of quantum states. We show that the exponential
dimension of Hilbert space and the gradient estimation complexity make this
choice unsuitable for hybrid quantum-classical algorithms run on more than a
few qubits. Specifically, we show that for a wide class of reasonable
parameterized quantum circuits, the probability that the gradient along any
reasonable direction is non-zero to some fixed precision is exponentially small
as a function of the number of qubits. We argue that this is related to the
2-design characteristic of random circuits, and that solutions to this problem
must be studied.
|
[
{
"version": "v1",
"created": "Thu, 29 Mar 2018 17:39:09 GMT"
}
] | 2019-02-04T00:00:00
|
[
[
"McClean",
"Jarrod R.",
""
],
[
"Boixo",
"Sergio",
""
],
[
"Smelyanskiy",
"Vadim N.",
""
],
[
"Babbush",
"Ryan",
""
],
[
"Neven",
"Hartmut",
""
]
] |
"gGMMfq/GmMrYHYp/93N0+xWLdmXQg/MVVNd+fP1mf1XE0Gr5QhdtWiYV+/WgE6Rn5iz9mzUsGs0omhs4aQs0BIGQYIOTxVa2HrAgeb0mFFnMfx/ICIjpqgWrsYisJZ6Irqf3/Zq2jH/iNIf7JG/UI93alIh/eINwbmLWjvK6Xz4="
|
cond-mat/9712328
|
Aram Galstyan
|
A. G. Galstyan and M. E. Raikh (University of Utah)
|
Disorder-Induced Broadening of the Density of States for 2D Electrons
with Strong Spin-Orbit Coupling
|
12 pages, REVTeX, 4 figures
| null |
10.1103/PhysRevB.58.6736
| null |
cond-mat.mes-hall
| null |
We study theoretically the disorder-induced smearing of the density of states
in a two-dimensional electron system taking into account a spin-orbit term in
the Hamiltonian of a free electron. We show that the characteristic energy
scale for the smearing increases with increasing the spin-orbit coupling. We
also demonstrate that in the limit of a strong spin-orbit coupling the diagrams
with self-intersections give a parametrically small contribution to the
self-energy. As a result, the coherent potential approximation becomes
asymptotically exact in this limit. The tail of the density of states has the
energy scale which is much smaller than the magnitude of the smearing. We find
the shape of the tail using the instanton approach.
|
[
{
"version": "v1",
"created": "Wed, 31 Dec 1997 22:54:20 GMT"
}
] | 2009-10-30T00:00:00
|
[
[
"Galstyan",
"A. G.",
"",
"University of Utah"
],
[
"Raikh",
"M. E.",
"",
"University of Utah"
]
] |
"OGuAXiCwKG5YWBh71WPRMa07cPT8jHODVBM//Xn+fVXA3Fp9SGRtemaNO/XgU6Tj0QjxA328W9UJqF8iyE41RTmaoNIXH1s+Gj4Afz0khtnB3J0IW8goPgEBouoMISohjr91z/73i0vyBbPpp24HCt3a0Kp3XLNSTdPUnH4SCx4="
|
2409.05329
|
Emmanuel Frion
|
Marcus V. Bomfim, Emmanuel Frion, Nelson Pinto-Neto, Sandro D. P.
Vitenti
|
Primordial magnetogenesis in a bouncing model with dark energy
|
13 pages, 10 figures. Matches the published version in the Open
Journal of Astrophysics
| null |
10.33232/001c.125505
| null |
gr-qc astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
We investigate primordial magnetogenesis within a quantum bouncing model
driven by a scalar field, focusing on various non-minimal couplings between the
electromagnetic field and the scalar field. We test three cases: no coupling, a
Cauchy coupling with gradual decay, and a Gaussian coupling with rapid
fall-off. By exploring these scenarios, we assess a wide range of coupling
strengths across different scales. The scalar field, with an exponential
potential, behaves as pressureless matter in the asymptotic past of the
contracting phase, as stiff matter around the bounce, and as dark energy during
the expanding phase. Our findings reveal that, among the tested cases, only the
Gaussian coupling can explain the generation of primordial magnetic fields on
cosmological scales.
|
[
{
"version": "v1",
"created": "Mon, 9 Sep 2024 05:13:19 GMT"
},
{
"version": "v2",
"created": "Tue, 10 Sep 2024 15:44:31 GMT"
},
{
"version": "v3",
"created": "Sun, 3 Nov 2024 15:52:01 GMT"
}
] | 2024-11-06T00:00:00
|
[
[
"Bomfim",
"Marcus V.",
""
],
[
"Frion",
"Emmanuel",
""
],
[
"Pinto-Neto",
"Nelson",
""
],
[
"Vitenti",
"Sandro D. P.",
""
]
] |
"5msQfpLgut5YUFj3fVD0WUbDINbwn9sNUNci6Tnu9lzFSBtlR21JWiaFX2mQQJPz8p69o3euXWEpLl8w2UhdRzmwi8QTY1K+GD1geP0mIuDZLR4Aqoip7amMox6JJK6oGl3vvqq8ju/mIad5oORBh43a3I13XoJyaQPeBPKUzzo="
|
2209.11661
|
Eike Hermann M\"uller
|
Eike Hermann M\"uller
|
Exact conservation laws for neural network integrators of dynamical
systems
|
24 pages, 16 figures; to appear in Journal of Computational Physics
| null |
10.1016/j.jcp.2023.112234
| null |
math.DS cs.LG gr-qc physics.comp-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The solution of time dependent differential equations with neural networks
has attracted a lot of attention recently. The central idea is to learn the
laws that govern the evolution of the solution from data, which might be
polluted with random noise. However, in contrast to other machine learning
applications, usually a lot is known about the system at hand. For example, for
many dynamical systems physical quantities such as energy or (angular) momentum
are exactly conserved. Hence, the neural network has to learn these
conservation laws from data and they will only be satisfied approximately due
to finite training time and random noise. In this paper we present an
alternative approach which uses Noether's Theorem to inherently incorporate
conservation laws into the architecture of the neural network. We demonstrate
that this leads to better predictions for three model systems: the motion of a
non-relativistic particle in a three-dimensional Newtonian gravitational
potential, the motion of a massive relativistic particle in the Schwarzschild
metric and a system of two interacting particles in four dimensions.
|
[
{
"version": "v1",
"created": "Fri, 23 Sep 2022 15:45:05 GMT"
},
{
"version": "v2",
"created": "Sun, 14 May 2023 12:36:33 GMT"
}
] | 2023-06-14T00:00:00
|
[
[
"Müller",
"Eike Hermann",
""
]
] |
"6HsMbpqjMM5YmJOXdXvwcGZJSUV8j4MVREdLybdvt1XswAoda81N3m6eG6Xh5KTgxAyd44GO3m2pun+pSFMtRKUcoMRTw5aUHL8AfL1iNF3BfRxAJIHpqQuJpRutBLyJjr+39ZKg3dryBZf9oGcUS8+7nKx34aJwaRPcDfKbn7w="
|
0705.2108
|
Sergey Masalovich
|
S. Masalovich
|
Method to measure neutron beam polarization with 2x1 Neutron Spin Filter
|
13 pages, 3 figures, submitted to Nucl. Instrum. Methods A on 02
January 2007
|
Nucl.Instrum.Meth.A581:791-798,2007
|
10.1016/j.nima.2007.08.150
| null |
nucl-ex
| null |
A method to measure a beam polarization with the use of polarized 3He gas is
discussed. It is shown that special design of the Neutron Spin Filter cell
allows for a fast and accurate measurement. The accuracy of this method is
analyzed.
|
[
{
"version": "v1",
"created": "Tue, 15 May 2007 10:10:30 GMT"
}
] | 2013-11-20T00:00:00
|
[
[
"Masalovich",
"S.",
""
]
] |
"hmjIXi7gOFrT2H32dfh+czlLXGRsv4OREtN9f5l79Vzs2AoVWkRFriWEeyJ487XuEAv5l3WsHAeopj0oSmExD2GSYMMS5VC+EnDkKvnycGSD/RioIQB7PbkK4YiMJTiojg8nnuJwju+mVPfh8mcsA8272At2BLJiTTLWrr9K57w="
|
2307.15570
|
Wentao Cai
|
Jingjing Pan and Wentao Cai
|
Error analysis of energy-conservative BDF2-FE scheme for the 2D
Navier-Stokes equations with variable density
|
22 pages, 1 figures
| null | null | null |
math.NA cs.NA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we present an error estimate of a second-order linearized
finite element (FE) method for the 2D Navier-Stokes equations with variable
density. In order to get error estimates, we first introduce an equivalent form
of the original system. Later, we propose a general BDF2-FE method for solving
this equivalent form, where the Taylor-Hood FE space is used for discretizing
the Navier-Stokes equations and conforming FE space is used for discretizing
density equation. We show that our scheme ensures discrete energy dissipation.
Under the assumption of sufficient smoothness of strong solutions, an error
estimate is presented for our numerical scheme for variable density
incompressible flow in two dimensions. Finally, some numerical examples are
provided to confirm our theoretical results.
|
[
{
"version": "v1",
"created": "Fri, 28 Jul 2023 14:06:21 GMT"
}
] | 2023-07-31T00:00:00
|
[
[
"Pan",
"Jingjing",
""
],
[
"Cai",
"Wentao",
""
]
] |
"fWMIbhijEMjU2FLaXVv88Wb56QOXo7P7VMVnOT9//hlM4B0NwghN2CaG0SnR1YLjwC2x6VOs208YtH3oUlMJlJmaYMQRzlKkFP2gbL+jpc+hrhdAOcGJPiG5sNuIBasp7DKlHby2jErCAZtoZG9EI8/OXY13zKJEeN6GnpN7Ujg="
|
2411.13976
|
Mohammad Kafini
|
Mohammad Kafini
|
Blow-up result for a piezoelectric beams system with magnetic effects
|
13 pages, no figures
| null | null | null |
math.AP
|
http://creativecommons.org/licenses/by/4.0/
|
The system under studying is for a piezoelectric beams system with magnetic
effects, frictional dampings and source terms. We use the concavity method to
study the competition of the dampings and the sources that leads to a blow-up
result for solutions with negative initial energy.
|
[
{
"version": "v1",
"created": "Thu, 21 Nov 2024 09:43:27 GMT"
}
] | 2024-11-22T00:00:00
|
[
[
"Kafini",
"Mohammad",
""
]
] |
"cdlQbo7gqN5R2NA3fVnca2bzbXLQ16ecQJN1zZmu5hVMwMsFCQTN2OaOiWU0RLLjco+0h9Ou3mUMoDilYVC0xF2YIdESx1aMGD2weLpygN2BSBxAKIBp6y24qtsJoKuIsju/9/CyjO/ivN9pMiYUA9/6XAh/F7KgTHPanDoefjo="
|
2406.09808
|
Andrea Vaccaro
|
Grigoris Kopsacheilis, Hung-Chang Liao, Aaron Tikuisis, Andrea Vaccaro
|
Uniform property $\Gamma$ and the small boundary property
|
24 pages; minor edits. This version has been accepted on Transactions of the AMS
| null | null | null |
math.OA math.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We prove that, for a free action $\alpha \colon G \curvearrowright X$ of a countably infinite discrete amenable group on a compact metric space, the small boundary property is implied by uniform property $\Gamma$ of the Cartan subalgebra $(C(X) \subseteq C(X) \rtimes_\alpha G)$. The reverse implication has been demonstrated by Kerr and Szab\'o for free actions, from which we obtain that these two conditions are equivalent. We moreover show that, if $\alpha$ is also minimal, then almost finiteness of $\alpha$ is implied by tracial $\mathcal{Z}$-stability of the subalgebra $(C(X) \subseteq C(X) \rtimes_\alpha G)$. The reverse implication is due to Kerr, resulting in the equivalence of these two properties as well. As an application, we prove that if $\alpha \colon G \curvearrowright X$ and $\beta \colon H \curvearrowright Y$ are free actions and $\alpha$ has the small boundary property, then $\alpha \times \beta \colon G \times H \curvearrowright X \times Y$ has the small boundary property. An analogous permanence property is obtained for almost finiteness in case $\alpha$ and $\beta$ are free minimal actions.
|
[
{
"version": "v1",
"created": "Fri, 14 Jun 2024 08:02:37 GMT"
},
{
"version": "v2",
"created": "Fri, 21 Jun 2024 08:42:27 GMT"
},
{
"version": "v3",
"created": "Wed, 09 Apr 2025 20:00:46 GMT"
},
{
"version": "v4",
"created": "Fri, 09 May 2025 09:06:17 GMT"
}
] | 2025-05-12T00:00:00
|
[
[
"Kopsacheilis",
"Grigoris",
""
],
[
"Liao",
"Hung-Chang",
""
],
[
"Tikuisis",
"Aaron",
""
],
[
"Vaccaro",
"Andrea",
""
]
] |
"8XEYH4PjEYDqUtUX5XD883Nr9YSUx7M5VENi3bd979QAYVoUTgdNXGyHOo0wwLmnwA5R80O8HEsgqd+hcFp2ROubocAXZ1SwGNUcyLAiNhmfWyzIa5g4P4i7jpYNAqwZiaY3z1K7gG9mRbetJudUA8+6lgV+3eGQDefcO7sKiiw="
|
2309.11930
|
Bo Ye
|
Bo Ye, Kai Gan, Tong Wei and Min-Ling Zhang
|
Bridging the Gap: Learning Pace Synchronization for Open-World
Semi-Supervised Learning
| null | null | null | null |
cs.LG cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In open-world semi-supervised learning, a machine learning model is tasked
with uncovering novel categories from unlabeled data while maintaining
performance on seen categories from labeled data. The central challenge is the
substantial learning gap between seen and novel categories, as the model learns
the former faster due to accurate supervisory information. Moreover, capturing
the semantics of unlabeled novel category samples is also challenging due to
the missing label information. To address the above issues, we introduce 1) the
adaptive synchronizing marginal loss which imposes class-specific negative
margins to alleviate the model bias towards seen classes, and 2) the
pseudo-label contrastive clustering which exploits pseudo-labels predicted by
the model to group unlabeled data from the same category together in the output
space. Extensive experiments on benchmark datasets demonstrate that previous
approaches may significantly hinder novel class learning, whereas our method
strikingly balances the learning pace between seen and novel classes, achieving
a remarkable 3% average accuracy increase on the ImageNet dataset. Importantly,
we find that fine-tuning the self-supervised pre-trained model significantly
boosts the performance, which is overlooked in prior literature. Our code is
available at https://github.com/yebo0216best/LPS-main.
|
[
{
"version": "v1",
"created": "Thu, 21 Sep 2023 09:44:39 GMT"
},
{
"version": "v2",
"created": "Wed, 17 Apr 2024 12:27:25 GMT"
}
] | 2024-04-18T00:00:00
|
[
[
"Ye",
"Bo",
""
],
[
"Gan",
"Kai",
""
],
[
"Wei",
"Tong",
""
],
[
"Zhang",
"Min-Ling",
""
]
] |
"immELoiimiZgD9IX/UIwo2QZB1TUD7HDc1d2Zb1/9xxC8AlJZRBtmgwHe/cmyaynwg61lxCs2smpqxitQE55wXESqfBT1kbYF7iE7N52VM2Fmz3KNoO2JA6V65ueZH6IjrMlvbSiD27mZbd5Z23Uu42tWKx/NLMCTQNUHntTKi8="
|
1911.04836
|
Eleonora Quadrivi
|
M. Nastasi, A. Paonessa, E. Previtali, E. Quadrivi, M. Sisti, S.
Aiello, G. Andronico, V. Antonelli, W. Baldini, M. Bellato, A. Bergnoli, A.
Brigatti, R. Brugnera, A. Budano, M. Buscemi, A. Cammi, R. Caruso, D. Chiesa,
C. Clementi, D. Corti, S. Costa, F. Dal Corso, X.F. Ding, S. Dusini, A.
Fabbri, G. Fiorentini, R. Ford, A. Formozov, G. Galet, A. Garfagnini, M.
Giammarchi, A. Giaz, M. Grassi, R. Isocrate, C. Landini, I. Lippi, P.
Lombardi, Y. Malyshkin, F. Mantovani, S.M. Mari, F. Marini, C. Martellini, A.
Martini, E. Meroni, M. Mezzetto, L. Miramonti, P. Montini, M. Montuschi, F.
Ortica, A. Paoloni, S. Parmeggiano, N. Pelliccia, G. Ranucci, A.C. Re, B.
Ricci, A. Romani, P. Saggese, G. Salamanna, F.H. Sawi, A. Serafini, G.
Settanta, C. Sirignano, L. Stanco, V. Strati, C. Tuv\`e, G. Verde, L. Votano
|
$^{222}$Rn contamination mechanisms on acrylic surfaces
| null | null | null | null |
physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, the $^{222}$Rn contamination mechanisms on acrylic surfaces
have been investigated. $^{222}$Rn can represent a significant background
source for low-background experiments, and acrylic is a suitable material for
detector design thanks to its purity and transparency. Four acrylic samples
have been exposed to a $^{222}$Rn rich environment for different time periods,
being contaminated by $^{222}$Rn and its progenies. Subsequently, the time
evolution of radiocontaminants activity on the samples has been evaluated with
$\alpha$ and $\gamma$ measurements, highlighting the role of different decay
modes in the contamination process. A detailed analysis of the alpha spectra
allowed to quantify the implantation depth of the contaminants. Moreover, a
study of both $\alpha$ and $\gamma$ measurements pointed out the $^{222}$Rn
diffusion inside the samples.
|
[
{
"version": "v1",
"created": "Tue, 12 Nov 2019 13:26:04 GMT"
}
] | 2019-11-13T00:00:00
|
[
[
"Nastasi",
"M.",
""
],
[
"Paonessa",
"A.",
""
],
[
"Previtali",
"E.",
""
],
[
"Quadrivi",
"E.",
""
],
[
"Sisti",
"M.",
""
],
[
"Aiello",
"S.",
""
],
[
"Andronico",
"G.",
""
],
[
"Antonelli",
"V.",
""
],
[
"Baldini",
"W.",
""
],
[
"Bellato",
"M.",
""
],
[
"Bergnoli",
"A.",
""
],
[
"Brigatti",
"A.",
""
],
[
"Brugnera",
"R.",
""
],
[
"Budano",
"A.",
""
],
[
"Buscemi",
"M.",
""
],
[
"Cammi",
"A.",
""
],
[
"Caruso",
"R.",
""
],
[
"Chiesa",
"D.",
""
],
[
"Clementi",
"C.",
""
],
[
"Corti",
"D.",
""
],
[
"Costa",
"S.",
""
],
[
"Corso",
"F. Dal",
""
],
[
"Ding",
"X. F.",
""
],
[
"Dusini",
"S.",
""
],
[
"Fabbri",
"A.",
""
],
[
"Fiorentini",
"G.",
""
],
[
"Ford",
"R.",
""
],
[
"Formozov",
"A.",
""
],
[
"Galet",
"G.",
""
],
[
"Garfagnini",
"A.",
""
],
[
"Giammarchi",
"M.",
""
],
[
"Giaz",
"A.",
""
],
[
"Grassi",
"M.",
""
],
[
"Isocrate",
"R.",
""
],
[
"Landini",
"C.",
""
],
[
"Lippi",
"I.",
""
],
[
"Lombardi",
"P.",
""
],
[
"Malyshkin",
"Y.",
""
],
[
"Mantovani",
"F.",
""
],
[
"Mari",
"S. M.",
""
],
[
"Marini",
"F.",
""
],
[
"Martellini",
"C.",
""
],
[
"Martini",
"A.",
""
],
[
"Meroni",
"E.",
""
],
[
"Mezzetto",
"M.",
""
],
[
"Miramonti",
"L.",
""
],
[
"Montini",
"P.",
""
],
[
"Montuschi",
"M.",
""
],
[
"Ortica",
"F.",
""
],
[
"Paoloni",
"A.",
""
],
[
"Parmeggiano",
"S.",
""
],
[
"Pelliccia",
"N.",
""
],
[
"Ranucci",
"G.",
""
],
[
"Re",
"A. C.",
""
],
[
"Ricci",
"B.",
""
],
[
"Romani",
"A.",
""
],
[
"Saggese",
"P.",
""
],
[
"Salamanna",
"G.",
""
],
[
"Sawi",
"F. H.",
""
],
[
"Serafini",
"A.",
""
],
[
"Settanta",
"G.",
""
],
[
"Sirignano",
"C.",
""
],
[
"Stanco",
"L.",
""
],
[
"Strati",
"V.",
""
],
[
"Tuvè",
"C.",
""
],
[
"Verde",
"G.",
""
],
[
"Votano",
"L.",
""
]
] |
"9GnUXJzsugrXDPHzbXI8owQrUE1wKtON1qdq29n/8HzE8AotUCRZ2maUGyD+wqOjYg391EevHw/psGcsyG85hSmeIc8TxVy/FLw2aOIiAGjTb77gI6HaLZiN9QqNJSKhijMXX6tOreqyZNNw62YsF9/YnCx/A/ZYQALQnhMaTik="
|
1903.12411
|
Cedric Buron
|
C\'edric Buron, Zahia Guessoum (SMA), Sylvain Ductor (UECE)
|
MCTS-based Automated Negotiation Agent (Extended Abstract)
| null |
AAMAS 2019, May 2019, Montreal, Canada
| null | null |
cs.AI cs.MA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper introduces a new Negotiating Agent for automated negotiation on
continuous domains and without considering a specified deadline. The agent
bidding strategy relies on Monte Carlo Tree Search, which is a trendy method
since it has been used with success on games with high branching factor such as
Go. It uses two opponent modeling techniques for its bidding strategy and its
utility: Gaussian process regression and Bayesian learning. Evaluation is done
by confronting the existing agents that are able to negotiate in such context:
Random Walker, Tit-for-tat and Nice Tit-for-Tat. None of those agents succeeds
in beating our agent; moreover the modular and adaptive nature of our approach
is a huge advantage when it comes to optimize it in specific applicative
contexts.
|
[
{
"version": "v1",
"created": "Fri, 29 Mar 2019 09:21:53 GMT"
}
] | 2019-04-01T00:00:00
|
[
[
"Buron",
"Cédric",
"",
"SMA"
],
[
"Guessoum",
"Zahia",
"",
"SMA"
],
[
"Ductor",
"Sylvain",
"",
"UECE"
]
] |
"yXYsb4CklNphGdqffWCVOT3tFMJFC7HnbVVzbT9//dTEYGAdekJsWLQGO+w1w7Cv4B68ehGuGKkI6nyLcc38Ce0OAER82cXskLXwaP2mJN3lexzoP6LoLVqbvJgHh3+Y7sslfJKCiDySjddogqdUJ93OnIh/VrPUbuRMTrITHq0="
|
0704.2298
|
Tao Wang
|
Tower Wang
|
Probing Alpha-Vacua of Black Holes in LHC
|
14 pages, 8 eps figures, improved substantially
| null | null |
USTC-ICTS-07-02
|
hep-th hep-ph
| null |
Motivated by the idea of alpha-vacua in Schwarzschild spacetime, we studied
the deformed spectrum of Hawking radiation. Such a deformation would leave
signatures on the small black hole evaporation in LHC because their vacuum
deviates from the Unruh state.
|
[
{
"version": "v1",
"created": "Wed, 18 Apr 2007 13:31:08 GMT"
},
{
"version": "v2",
"created": "Fri, 25 May 2007 12:04:47 GMT"
},
{
"version": "v3",
"created": "Tue, 30 Oct 2007 01:26:23 GMT"
}
] | 2007-10-30T00:00:00
|
[
[
"Wang",
"Tower",
""
]
] |
"MGkQfSrliE7YEVrXVWJQ83fLYBL4j5svUtOv39juHl1kmHrFA0553i6XGeDgoIPjjI+Fe+Ok3s8JoJ/kSVo5D9OWoIbQL1O2GL04LNQuAHmJXzUgaohpryy/pxmvNIyJgDfyneo0nG/k1aP7qEZcB8Tazsx2X4HwDVfAXMwWqz4="
|
cond-mat/0507231
|
Abolfazl Ramezanpour
|
A. Ramezanpour, S. Moghimi-Araghi
|
Spanning Trees in Random Satisfiability Problems
|
12 pages, 5 figures, published version
|
J. Phys. A: Math. Gen. 39 (2006) 4901-4909
|
10.1088/0305-4470/39/18/008
| null |
cond-mat.dis-nn cond-mat.stat-mech
| null |
Working with tree graphs is always easier than with loopy ones and spanning
trees are the closest tree-like structures to a given graph. We find a
correspondence between the solutions of random K-satisfiability problem and
those of spanning trees in the associated factor graph. We introduce a modified
survey propagation algorithm which returns null edges of the factor graph and
helps us to find satisfiable spanning trees. This allows us to study
organization of satisfiable spanning trees in the space spanned by spanning
trees.
|
[
{
"version": "v1",
"created": "Mon, 11 Jul 2005 05:27:40 GMT"
},
{
"version": "v2",
"created": "Sun, 23 Apr 2006 11:39:29 GMT"
}
] | 2009-11-11T00:00:00
|
[
[
"Ramezanpour",
"A.",
""
],
[
"Moghimi-Araghi",
"S.",
""
]
] |
"/WlNf4ygk9gYHdMffVNaszR748JUD6PbUHU7bn3/+VxG4Dh96kptGgwWMbWSQ6xnxgx9jhGMmG0AqlwqUiA92vSnIcRYw0WkFLS2qYk2Fu2NeR3IaqAcLhkZrpa8Bp6I7aO1/9bwhn8yR5d6Jq1TQ93aHAh+yLNDffHELLNLTy4="
|
astro-ph/0701553
|
Jelle de Plaa
|
J. de Plaa, N. Werner, J.A.M. Bleeker, Jacco Vink, J.S. Kaastra, M.
Mendez
|
Constraining supernova models using the hot gas in clusters of galaxies
|
13 pages, 10 figures, accepted for publication in A&A
| null |
10.1051/0004-6361:20066382
| null |
astro-ph
| null |
The hot Intra-Cluster Medium (ICM) in clusters of galaxies is a very large
repository of metals produced by supernovae. We aim to accurately measure the
abundances in the ICM of many clusters and compare these data with metal yields
produced by supernovae. Using the data archive of the XMM-Newton X-ray
observatory, we compile a sample of 22 clusters. We fit spectra extracted from
the core regions and determine the abundances of silicon, sulfur, argon,
alcium, iron, and nickel. The abundances from the spectral fits are
subsequently fitted to supernova yields determined from several supernova type
Ia and core-collapse supernova models. We find that the argon and calcium
abundances cannot be fitted with currently favoured supernova type Ia models.
We obtain a major improvement of the fit, when we use an empirically modified
delayed-detonation model that is calibrated on the Tycho supernova remnant. The
two modified parameters are the density where the sound wave in the supernova
turns into a shock and the ratio of the specific internal energies of ions and
electrons at the shock. Our fits also suggest that the core-collapse supernovae
that contributed to the enrichment of the ICM had progenitors which were
already enriched. The Ar/Ca ratio in clusters is a good touchstone for
determining the quality of type Ia models. The core-collapse contribution,
which is about 50% and not strongly dependent on the IMF or progenitor
metallicity, does not have a significant impact on the Ar/Ca ratio. The number
ratio between supernova type Ia and core-collapse supernovae suggests that
binary systems in the appropriate mass range are very efficient (~ 5-16%) in
eventually forming supernova type Ia explosions.
|
[
{
"version": "v1",
"created": "Fri, 19 Jan 2007 09:02:44 GMT"
}
] | 2007-05-23T00:00:00
|
[
[
"de Plaa",
"J.",
""
],
[
"Werner",
"N.",
""
],
[
"Bleeker",
"J. A. M.",
""
],
[
"Vink",
"Jacco",
""
],
[
"Kaastra",
"J. S.",
""
],
[
"Mendez",
"M.",
""
]
] |
"5GjAfJqumg5kTPvTfXK1x4fLRNS0L5PPQpNvRznMt3hH0CtdSixN3ySdWzlYarfjcI81LF+MWl8Jsl9w00EJQBm0qIRV/UW+Fz38KdduYmXBfw8oMYC4rSuN6goPJD4J7Is3l524Ef+i5fpx80ZMAc3Y3a13VLBUTJPQhLg6big="
|
2310.14886
|
Julian Quast
|
Julian Quast
|
Deformations of $G$-valued pseudocharacters
|
53 pages
| null | null | null |
math.NT math.RT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We define a deformation space of V. Lafforgue's $G$-valued pseudocharacters
of a profinite group $\Gamma$ for a possibly disconnected reductive group $G$.
We show, that this definition generalizes Chenevier's construction. We show
that the universal pseudodeformation ring is noetherian and that the functor of
continuous $G$-pseudocharacters on affinoid $\mathbb{Q}_p$-algebras is
represented by a quasi-Stein rigid analytic space, whenever $\Gamma$ is
topologically finitely generated. We also show that the pseudodeformation ring
is noetherian, when $\Gamma$ satisfies Mazur's condition $\Phi_p$ and $G$
satisfies a certain invariant-theoretic condition. For $G = \mathrm{Sp}_{2n}$
we describe three types of obstructed loci in the special fiber of the
universal pseudodeformation space of an arbitrary residual pseudocharacter and
give upper bounds for their dimension.
|
[
{
"version": "v1",
"created": "Mon, 23 Oct 2023 12:55:04 GMT"
}
] | 2023-10-24T00:00:00
|
[
[
"Quast",
"Julian",
""
]
] |
"uHuMbwKjAZRQGEIf5VKks2ItpBW2T7sp1Efm1ff9dVhKeFtcyiNs3G6HOsXxwbilwA91p3OGXJmAoPShSGh8hOufocAWwFOKmp0UaLYkDvmYOBzA6Kg6Liyq7lcdBK6Jmac+KVY5h+7mhxfrJm/UC1eKzKN+36OQSJLUknlaAzo="
|
cond-mat/9712015
|
Zachary Ha
|
Z. N. C. Ha (NHMFL,Tallahasee)
|
New Paired-Wavefunction for the Frustrated Antiferromagnetic Spin-Half
Chain
| null | null | null |
NHMFL-97-11
|
cond-mat.str-el cond-mat.supr-con
| null |
I propose a new paired-wavefunction with a parameter that continuously
interpolates from the 1D Jastrow-product to the Majumdar-Ghosh
dimer-wavefunction appropriate for the frustrated Heisenberg $S = 1/2$
antiferromagnet. This spin paired-state constructed in $S_z$ basis is an
alternative to the well-known resonating-valence-bond basis state for
describing the $S = 0$ ground-state with no apparent long-range spin order.
Some numerical evidences are presented.
|
[
{
"version": "v1",
"created": "Mon, 1 Dec 1997 17:13:57 GMT"
}
] | 2007-05-23T00:00:00
|
[
[
"Ha",
"Z. N. C.",
"",
"NHMFL,Tallahasee"
]
] |
"IGlIfhagLEqQWBR/tVrV/j1r7Fz0tPPERFNZbfl/KVyc6AtdSgZt3Gaca+Xxw6Rr0Qr1g3OsTlGAqV3oWg0dQX206eQW1lGuHDwE2rUmJPCCfYWAasopHwGikOoNIziIpy83v/9jJv7mhbJtpm8GCN3alCt6TPMCRwLUljoTKrw="
|
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