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2207.04628
Karl Winsor
Karl Winsor
Dense real Rel flow orbits and absolute period leaves
32 pages, comments welcome
null
null
null
math.DS math.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show the existence of a dense orbit for real Rel flows on the area-1 locus of every connected component of every stratum of holomorphic 1-forms with at least 2 distinct zeros. For this purpose, we establish a general density criterion for ${\rm SL}(2,\mathbb{R})$-orbit closures, based on finding an orbit of a real Rel flow whose closure contains a horocycle. This criterion can be verified using explicit constructions of holomorphic 1-forms with a periodic horizontal foliation. Our constructions also provide explicit examples of dense leaves of the absolute period foliation and many subfoliations of these loci.
[ { "version": "v1", "created": "Mon, 11 Jul 2022 04:58:52 GMT" }, { "version": "v2", "created": "Fri, 23 Dec 2022 06:20:19 GMT" } ]
2022-12-26T00:00:00
[ [ "Winsor", "Karl", "" ] ]
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physics/0602125
Ruggero Santilli Maria
Ruggero Maria Santilli
The Novel ''Controlled Intermediate Nuclear Fusion'' and its Possible Industrial Realization as Predicted by Hadronic Mechanics and Chemistry
32 pages, 5 figures. Journal of Applied Sciences, in press
null
10.3923/jas.2007.1679.1698
IBR-TP-09-05
physics.gen-ph
null
In this note, we propose, apparently for the first time, a new type of controlled nuclear fusion called "intermediate" because occurring at energies intermediate between those of the ''cold'' and ''hot'' fusions, and propose a specific industrial realization. For this purpose: 1) We show that known limitations of quantum mechanics, quantum chemistry and special relativity cause excessive departures from the conditions occurring for all controlled fusions; 2) We outline the covering hadronic mechanics, hadronic chemistry and isorelativity specifically conceived, constructed and verified during the past two decades for new cleans energies and fuels; 3) We identify seven physical laws predicted by the latter disciplines that have to be verified by all controlled nuclear fusions to occur; 4) We review the industrial research conducted to date in the selection of the most promising engineering realization as well as optimization of said seven laws; and 5) We propose with construction details a specific {\it hadronic reactor} (patented and international patents pending), consisting of actual equipment specifically intended for the possible industrial production of the clean energy released by representative cases of controlled intermediate fusions for independent scrutiny by interested colleagues.
[ { "version": "v1", "created": "Fri, 17 Feb 2006 22:25:18 GMT" } ]
2016-11-15T00:00:00
[ [ "Santilli", "Ruggero Maria", "" ] ]
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1809.07387
Frederic Moisy
St\'ephane Perrard, Adri\'an Lozano-Dur\'an, Marc Rabaud, Michael Benzaquen and Fr\'ed\'eric Moisy
Turbulent windprint on a liquid surface
J. Fluid Mech. 2019 (in press)
J. Fluid Mech. 873, 1020-1054 (2019)
10.1017/jfm.2019.318
null
physics.flu-dyn physics.geo-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the effect of a light turbulent wind on a liquid surface, below the onset of wave generation. In that regime, the liquid surface is populated by small disorganised deformations elongated in the streamwise direction. Formally identified recently by Paquier et al. (2015), the deformations that occur below the wave onset were named wrinkles. We provide here a theoretical framework for this wrinkle regime, using the viscous response of a free surface liquid submitted to arbitrary normal and tangential interfacial stresses at its upper boundary. We relate the spatio-temporal spectrum of the surface deformations to that of the applied interfacial pressure and shear stress fluctuations. For that, we evaluate the spatio-temporal statistics of the turbulent forcing using Direct Numerical Simulation of a turbulent air channel flow, assuming no coupling between the air and the liquid flows. Combining theory and numerical simulation, we thus obtain synthetic wrinkles that reproduce previous experimental investigations. We show that the wrinkles are a multi-scale superposition of random wakes generated by the turbulent fluctuations. They result mainly from the nearly isotropic pressure fluctuations generated in the boundary layer, rather than from the elongated shear stress fluctuations. The wrinkle regime described in this paper naturally arises as the viscous-saturated asymptotic of the inviscid growth theory of Phillips (1957). Experiments indicate that the onset of exponential wave growth depends on the liquid viscosity. Our theory suggests that the empirical criterion for the onset is satisfied when the wrinkle amplitude reaches a given fraction of the viscous sublayer thickness. It indicates that the turbulent fluctuations near the onset may play a role in the triggering of exponential wave growth.
[ { "version": "v1", "created": "Wed, 19 Sep 2018 19:45:12 GMT" }, { "version": "v2", "created": "Fri, 12 Apr 2019 20:47:27 GMT" } ]
2020-12-01T00:00:00
[ [ "Perrard", "Stéphane", "" ], [ "Lozano-Durán", "Adrián", "" ], [ "Rabaud", "Marc", "" ], [ "Benzaquen", "Michael", "" ], [ "Moisy", "Frédéric", "" ] ]
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2508.17186
Zhenghui Zhao
Zhenghui Zhao, Chen Wu, Di Wang, Hongruixuan Chen, Cuiqun Chen, Zhuo Zheng, Bo Du, Liangpei Zhang
Advancing Weakly-Supervised Change Detection in Satellite Images via Adversarial Class Prompting
null
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Weakly-Supervised Change Detection (WSCD) aims to distinguish specific object changes (e.g., objects appearing or disappearing) from background variations (e.g., environmental changes due to light, weather, or seasonal shifts) in paired satellite images, relying only on paired image (i.e., image-level) classification labels. This technique significantly reduces the need for dense annotations required in fully-supervised change detection. However, as image-level supervision only indicates whether objects have changed in a scene, WSCD methods often misclassify background variations as object changes, especially in complex remote-sensing scenarios. In this work, we propose an Adversarial Class Prompting (AdvCP) method to address this co-occurring noise problem, including two phases: a) Adversarial Prompt Mining: After each training iteration, we introduce adversarial prompting perturbations, using incorrect one-hot image-level labels to activate erroneous feature mappings. This process reveals co-occurring adversarial samples under weak supervision, namely background variation features that are likely to be misclassified as object changes. b) Adversarial Sample Rectification: We integrate these adversarially prompt-activated pixel samples into training by constructing an online global prototype. This prototype is built from an exponentially weighted moving average of the current batch and all historical training data. Our AdvCP can be seamlessly integrated into current WSCD methods without adding additional inference cost. Experiments on ConvNet, Transformer, and Segment Anything Model (SAM)-based baselines demonstrate significant performance enhancements. Furthermore, we demonstrate the generalizability of AdvCP to other multi-class weakly-supervised dense prediction scenarios. Code is available at https://github.com/zhenghuizhao/AdvCP
[ { "version": "v1", "created": "Sun, 24 Aug 2025 02:02:16 GMT" } ]
2025-08-26T00:00:00
[ [ "Zhao", "Zhenghui", "" ], [ "Wu", "Chen", "" ], [ "Wang", "Di", "" ], [ "Chen", "Hongruixuan", "" ], [ "Chen", "Cuiqun", "" ], [ "Zheng", "Zhuo", "" ], [ "Du", "Bo", "" ], [ "Zhang", "Liangpei", "" ] ]
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2309.03816
Eneko Aranguren
Eneko Aranguren and Jos\'e A. Font and Nicolas Sanchis-Gual and Ra\"ul Vera
Revisiting the $I$-Love-$Q$ relations for superfluid neutron stars
18 pages, 3 figures. Reference added, typos and minor corrections, and some discussion expanded, to agree with the published version
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null
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gr-qc astro-ph.HE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the tidal problem and the resulting $I$-Love-$Q$ approximate universal relations for rotating superfluid neutron stars in the Hartle-Thorne formalism. Superfluid stars are described in this work by means of a two-fluid model consisting of superfluid neutrons and all other charged constituents. We employ a stationary and axisymmetric perturbation scheme to second order around a static and spherically symmetric background. Recently, we used this scheme to study isolated rotating superfluid stars. In this paper it is applied to analyze the axially symmetric sector of the tidal problem in a binary system. We show that a consistent use of perturbative matching theory amends the original two-fluid formalism for the tidal problem to account for the possible non-zero value of the energy density at the boundary of the star. This is exemplified by building numerically different stellar models spanning three equations of state. Significant departures from universality are found when the correct matching relations are not taken into account. We also present an augmented set of universal relations for superfluid neutron stars which includes the contribution to the total mass of the star at second order, $\delta M$. Therefore, our results complete the set of universal relations for rotating superfluid stars, generalizing our previous findings in the perfect fluid case.
[ { "version": "v1", "created": "Thu, 7 Sep 2023 16:12:27 GMT" }, { "version": "v2", "created": "Wed, 22 Nov 2023 14:36:28 GMT" } ]
2023-11-23T00:00:00
[ [ "Aranguren", "Eneko", "" ], [ "Font", "José A.", "" ], [ "Sanchis-Gual", "Nicolas", "" ], [ "Vera", "Raül", "" ] ]
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1505.05336
Rita Bernabei
R. Bernabei (1), P. Belli (1), S. d'Angelo (1), A. Di Marco (1), F. Montecchia (1,5), A. d'Angelo (2), A. Incicchitti (2), F. Cappella (3), V. Caracciolo (3), R. Cerulli (3), C.J. Dai (4), H.L. He (4), H.H. Kuang (4), X.H. Ma (4), X.D. Sheng (4), R.G. Wang (4), Z.P. Ye (4,6) ((1) Univ. Roma Tor Vergata and INFN Roma Tor Vergata, (2) Univ. Roma and INFN Roma, (3) INFN LNGS, (4) IHEP Beijing, (5) Univ. Tor Vergata, (6) Univ. Jing Gangshan)
Investigating Earth shadowing effect with DAMA/LIBRA-phase1
22 pages, 9 figures, 1 table; in publication on Eur. Phys. J. C
Eur. Phys. J. C 75 (2015) 239
10.1140/epjc/s10052-015-3473-y
null
hep-ph astro-ph.GA hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the present paper the results obtained in the investigation of possible diurnal effects for low-energy single-hit scintillation events of DAMA/LIBRA-phase1 (1.04 ton $\times$ yr exposure) have been analysed in terms of an effect expected in case of Dark Matter (DM) candidates inducing nuclear recoils and having high cross-section with ordinary matter, which implies low DM local density in order to fulfill the DAMA/LIBRA DM annual modulation results. This effect is due to the different Earth depths crossed by those DM candidates during the sidereal day.
[ { "version": "v1", "created": "Wed, 20 May 2015 12:06:53 GMT" } ]
2015-07-03T00:00:00
[ [ "Bernabei", "R.", "" ], [ "Belli", "P.", "" ], [ "d'Angelo", "S.", "" ], [ "Di Marco", "A.", "" ], [ "Montecchia", "F.", "" ], [ "d'Angelo", "A.", "" ], [ "Incicchitti", "A.", "" ], [ "Cappella", "F.", "" ], [ "Caracciolo", "V.", "" ], [ "Cerulli", "R.", "" ], [ "Dai", "C. J.", "" ], [ "He", "H. L.", "" ], [ "Kuang", "H. H.", "" ], [ "Ma", "X. H.", "" ], [ "Sheng", "X. D.", "" ], [ "Wang", "R. G.", "" ], [ "Ye", "Z. P.", "" ] ]
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1809.01463
Danila Cherkashin
Mikhail Basok, Danila Cherkashin, Nikita Rastegaev, Yana Teplitskaya
On uniqueness in Steiner problem
null
null
null
null
math.MG math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove that the set of $n$-point configurations for which the solution of the planar Steiner problem is not unique has the Hausdorff dimension at most $2n-1$ (as a subset of $\mathbb{R}^{2n}$). Moreover, we show that the Hausdorff dimension of the set of $n$-point configurations on which at least two locally minimal trees have the same length is also at most $2n-1$. Methods we use essentially require rely upon the theory of subanalytic sets developed in~\cite{bierstone1988semianalytic}. Motivated by this approach we develop a general setup for the similar problem of uniqueness of the Steiner tree where the Euclidean plane is replace by an arbitrary analytic Riemannian manifold $M$. In this setup we argue that the set of configurations possessing two locally-minimal trees of the same length either has the dimension $n\dim M-1$ or has a non-empty interior. We provide an example of a two-dimensional surface for which the last alternative holds. In addition to abovementioned results, we study the set of set of $n$-point configurations for which there is a unique solution of the Steiner problem in $\mathbb{R}^d$. We show that this set is path-connected.
[ { "version": "v1", "created": "Wed, 5 Sep 2018 12:47:32 GMT" }, { "version": "v2", "created": "Sat, 29 Sep 2018 08:35:32 GMT" }, { "version": "v3", "created": "Tue, 21 Mar 2023 13:28:57 GMT" } ]
2023-03-22T00:00:00
[ [ "Basok", "Mikhail", "" ], [ "Cherkashin", "Danila", "" ], [ "Rastegaev", "Nikita", "" ], [ "Teplitskaya", "Yana", "" ] ]
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1910.01848
S{\o}ren Ulstrup
Klara Volckaert, Habib Rostami, Deepnarayan Biswas, Igor Markovi\'c, Federico Andreatta, Charlotte E. Sanders, Paulina Majchrzak, Cephise Cacho, Richard T. Chapman, Adam Wyatt, Emma Springate, Daniel Lizzit, Luca Bignardi, Silvano Lizzit, Sanjoy K. Mahatha, Marco Bianchi, Nicola Lanata, Phil D. C. King, Jill A. Miwa, Alexander V. Balatsky, Philip Hofmann and S{\o}ren Ulstrup
Momentum-resolved linear dichroism in bilayer MoS$_2$
10 pages including supporting information, 3 figures in the main paper and 4 figures in the supporting information
Phys. Rev. B 100, 241406 (2019)
10.1103/PhysRevB.100.241406
null
cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Inversion-symmetric crystals are optically isotropic and thus naively not expected to show dichroism effects in optical absorption and photoemission processes. Here, we find a strong linear dichroism effect (up to 42.4%) in the conduction band of inversion-symmetric bilayer MoS$_2$, when measuring energy- and momentum-resolved snapshots of excited electrons by time- and angle-resolved photoemission spectroscopy. We model the polarization-dependent photoemission intensity in the transiently-populated conduction band using the semiconductor Bloch equations and show that the observed dichroism emerges from intralayer single-particle effects within the isotropic part of the dispersion. This leads to optical excitations with an anisotropic momentum-dependence in an otherwise inversion symmetric material.
[ { "version": "v1", "created": "Fri, 4 Oct 2019 09:32:58 GMT" } ]
2019-12-18T00:00:00
[ [ "Volckaert", "Klara", "" ], [ "Rostami", "Habib", "" ], [ "Biswas", "Deepnarayan", "" ], [ "Marković", "Igor", "" ], [ "Andreatta", "Federico", "" ], [ "Sanders", "Charlotte E.", "" ], [ "Majchrzak", "Paulina", "" ], [ "Cacho", "Cephise", "" ], [ "Chapman", "Richard T.", "" ], [ "Wyatt", "Adam", "" ], [ "Springate", "Emma", "" ], [ "Lizzit", "Daniel", "" ], [ "Bignardi", "Luca", "" ], [ "Lizzit", "Silvano", "" ], [ "Mahatha", "Sanjoy K.", "" ], [ "Bianchi", "Marco", "" ], [ "Lanata", "Nicola", "" ], [ "King", "Phil D. C.", "" ], [ "Miwa", "Jill A.", "" ], [ "Balatsky", "Alexander V.", "" ], [ "Hofmann", "Philip", "" ], [ "Ulstrup", "Søren", "" ] ]
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2206.14428
Luca Guido Molinari
Luca Guido Molinari
Graphene nanocones and Pascal matrices
15 pages, 3 figures. Incongruences in notation have been removed
null
null
null
math.CO math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
I conjecture three identities for the determinant of adjacency matrices of graphene triangles and trapezia with Bloch (and more general) boundary conditions. For triangles, the parametric determinant is equal to the characteristic polynomial of the symmetric Pascal matrix. For trapezia it is equal to the determinant of a sub-matrix. Finally, the determinant of the tight binding matrix equals its permanent. The conjectures are supported by analytic evaluations and Mathematica, for moderate sizes. They establish connections with counting problems of partitions, lozenge tilings of hexagons, dense loops on a cylinder.
[ { "version": "v1", "created": "Wed, 29 Jun 2022 06:59:15 GMT" }, { "version": "v2", "created": "Sun, 21 Aug 2022 04:47:29 GMT" } ]
2022-08-23T00:00:00
[ [ "Molinari", "Luca Guido", "" ] ]
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0910.4049
Nizami Gasilov
N. Gasilov, \c{S}ahin Emrah Amrahov, A. Golayoglu Fatullayev, H. I. Karakas, O. Akin
A Geometric Approach to Solve Fuzzy Linear Systems
null
CMES: Computer Modeling in Engineering & Sciences, Vol. 75, No. 3, pp. 189-204, 2011
10.3970/cmes.2011.075.189
null
cs.NA math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, linear systems with a crisp real coefficient matrix and with a vector of fuzzy triangular numbers on the right-hand side are studied. A new method, which is based on the geometric representations of linear transformations, is proposed to find solutions. The method uses the fact that a vector of fuzzy triangular numbers forms a rectangular prism in n-dimensional space and that the image of a parallelepiped is also a parallelepiped under a linear transformation. The suggested method clarifies why in general case different approaches do not generate solutions as fuzzy numbers. It is geometrically proved that if the coefficient matrix is a generalized permutation matrix, then the solution of a fuzzy linear system (FLS) is a vector of fuzzy numbers irrespective of the vector on the right-hand side. The most important difference between this and previous papers on FLS is that the solution is sought as a fuzzy set of vectors (with real components) rather than a vector of fuzzy numbers. Each vector in the solution set solves the given FLS with a certain possibility. The suggested method can also be applied in the case when the right-hand side is a vector of fuzzy numbers in parametric form. However, in this case, -cuts of the solution can not be determined by geometric similarity and additional computations are needed.
[ { "version": "v1", "created": "Wed, 21 Oct 2009 11:20:37 GMT" }, { "version": "v2", "created": "Tue, 12 Apr 2011 08:06:58 GMT" } ]
2011-11-03T00:00:00
[ [ "Gasilov", "N.", "" ], [ "Amrahov", "Şahin Emrah", "" ], [ "Fatullayev", "A. Golayoglu", "" ], [ "Karakas", "H. I.", "" ], [ "Akin", "O.", "" ] ]
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1903.11953
Pan Liu
Pan Liu and Carola-Bibiane Sch\"onlieb
Learning optimal orders of the underlying Euclidean norm in total variation image denoising
null
null
null
null
math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A novel class of semi-norms, generalising the notion of the isotropic total variation $TV_{2}$ and the an-isotropic total variation $TV_{1}$ is introduced. A supervised learning method via bilevel optimisation is proposed for the computation of optimal parameters for this class of regularizers. Existence of solutions to the bilevel optimisation approach is proven. Moreover, a finite-dimensional approximation scheme for the bilevel optimisation approach is introduced that can numerically compute a global optimizer to any given accuracy.
[ { "version": "v1", "created": "Thu, 28 Mar 2019 13:22:37 GMT" } ]
2019-03-29T00:00:00
[ [ "Liu", "Pan", "" ], [ "Schönlieb", "Carola-Bibiane", "" ] ]
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1606.05331
Bruce Smith
Bruce K. Smith
The Pattern Basis Approach to Circuit Complexity
101 pages, 4 figures
null
null
null
cs.CC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We describe and motivate a proposed new approach to lowerbounding the circuit complexity of boolean functions, based on a new formalization of "patterns" as elements of a special basis of the vector space of all truth table properties. We prove that a "pattern basis" with certain properties would lead to a useful complexity formula of a specific form, and speculate on how to find such a basis. This formula might take as long to compute on arbitrary functions as a brute-force search among circuits, thus addressing the natural proofs barrier, but has a form amenable to proving lower bounds for well-understood explicit functions.
[ { "version": "v1", "created": "Thu, 16 Jun 2016 19:43:28 GMT" } ]
2016-06-17T00:00:00
[ [ "Smith", "Bruce K.", "" ] ]
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1305.0551
Martin Laming
J. Martin Laming, J. Dan Moses, Yuan-Kuen Ko, Chee K. Ng, Cara E. Rakowski, and Allan J. Tylka
On the Remote Detection of Suprathermal Ions in the Solar Corona and their Role as Seeds for Solar Energetic Particle Production
15 pages, emulateapj, 6 figures, accepted by ApJ
null
10.1088/0004-637X/770/1/73
null
astro-ph.SR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Forecasting large Solar Energetic Particle (SEP) events associated with shocks driven by fast coronal mass ejections (CME) pose a major difficulty in the field of Space Weather. Besides issues associated with CME initiation, the SEP intensities are difficult to predict, spanning 3 orders of magnitude at any given CME speed. Many lines of indirect evidence point to the pre-existence of suprathermal seed particles for injection into the acceleration process as a key ingredient limiting the SEP intensity of a given event. This paper outlines the observational and theoretical basis for the inference that a suprathermal particle population is present prior to large SEP events, explores various scenarios for generating seed particles and their observational signatures, and explains how such suprathermals could be detected through measuring the wings of the H I Ly-alpha line.
[ { "version": "v1", "created": "Thu, 2 May 2013 19:45:17 GMT" } ]
2019-08-19T00:00:00
[ [ "Laming", "J. Martin", "" ], [ "Moses", "J. Dan", "" ], [ "Ko", "Yuan-Kuen", "" ], [ "Ng", "Chee K.", "" ], [ "Rakowski", "Cara E.", "" ], [ "Tylka", "Allan J.", "" ] ]
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1709.09746
Ma Yong-Liang
Yong-Liang Ma and Masayasu Harada
Chiral partner structure of doubly heavy baryons with heavy quark spin-flavor symmetry
7 pages
null
10.1088/1361-6471/aac86e
null
hep-ph hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The spectrum of the doubly heavy baryons is estimated with respect to the new observation from the LHCb collaboration [Aaij:2017ueg] by using the chiral partner structure and heavy quark spin-flavor symmetry. The effects of heavy quark flavor symmetry breaking and light quark flavor symmetry are considered. The mass splitting of doubly heavy baryons with the same spin but opposite parity arises from the generalized Goldberger-Treiman relation. The intermultiplet one-pion transition and intramultiplet radiative transitions are also be estimated.
[ { "version": "v1", "created": "Wed, 27 Sep 2017 21:53:18 GMT" } ]
2018-08-01T00:00:00
[ [ "Ma", "Yong-Liang", "" ], [ "Harada", "Masayasu", "" ] ]
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1707.03951
Shuang-Liang Li
Shuang-Liang Li, Fu-Guo Xie
A strong negative correlation between radio loudness $R_{\rm UV}$ and optical-to-X-ray spectral index $\alpha_{\rm ox}$ in low-luminosity AGNs
8 pages, 3 figures, 2 tables. Accepted by MNRAS
null
10.1093/mnras/stx1778
null
astro-ph.HE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It has been argued for years that the accretion mode changes from bright active galactic nuclei (AGNs) to low-luminosity AGNs (LLAGNs) at a rough dividing point of bolometric Eddington ratio $\lambda \sim 10^{-2}$. In this work, we strengthen this scenario through investigation of the relationship between the radio loudness $R_{\rm UV}$ and the optical-to-X-ray spectral index $\alpha_{\rm ox}$ in LLAGNs with $10^{-6} \lesssim \lambda \lesssim 10^{-3}$. We compile from literature a sample of 32 LLAGNs, consisting 18 LINERs and 14 low Eddington ratio Seyfert galaxies, and observe a strong negative $R_{\rm UV}$--$\alpha_{\rm ox}$ relationship, with large scatter in both $R_{\rm UV}$ and $\alpha_{\rm ox}$. We further demonstrate that this negative correlation, and the additional two negative relationships reported in literature ($R_{\rm UV}$--$\lambda$ and $\alpha_{\rm ox}$--$\lambda$ correlations), can be understood consistently and comprehensively under the truncated accretion--jet model, the model that has been applied successfully applied to LLAGNs. We argue that the scatter in the observations are (mainly) due to the spread in the viscosity parameter $\alpha$ of a hot accretion flow, a parameter that potentially can serve as a diagnose of the strength and/or configuration of magnetic fields in accretion flows.
[ { "version": "v1", "created": "Thu, 13 Jul 2017 01:51:07 GMT" } ]
2017-08-16T00:00:00
[ [ "Li", "Shuang-Liang", "" ], [ "Xie", "Fu-Guo", "" ] ]
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0706.0211
Joanne D. Cohn
J.D. Cohn, A.E. Evrard, M. White, D. Croton, E. Ellingson
Red Sequence Cluster Finding in the Millennium Simulation
final version to appear in MNRAS. Appendix added on purity and completeness, small shift in red sequence due to correcting an error in finding it
null
10.1111/j.1365-2966.2007.12479.x
null
astro-ph
null
We investigate halo mass selection properties of red-sequence cluster finders using galaxy populations of the Millennium Simulation (MS). A clear red sequence exists for MS galaxies in massive halos at redshifts z < 1, and we use this knowledge to inform a cluster-finding algorithm applied to 500 Mpc/h projections of the simulated volume. At low redshift (z=0.4), we find that 90% of the clusters found have galaxy membership dominated by a single, real-space halo, and that 10% are blended systems for which no single halo contributes a majority of a cluster's membership. At z=1, the fraction of blends increases to 22%, as weaker redshift evolution in observed color extends the comoving length probed by a fixed range of color. Other factors contributing to the increased blending at high-z include broadening of the red sequence and confusion from a larger number of intermediate mass halos hosting bright red galaxies of magnitude similar to those in higher mass halos. Our method produces catalogs of cluster candidates whose halo mass selection function, p(M|\Ngal,z), is characterized by a bimodal log-normal model with a dominant component that reproduces well the real-space distribution, and a redshift-dependent tail that is broader and displaced by a factor ~2 lower in mass. We discuss implications for X-ray properties of optically selected clusters and offer ideas for improving both mock catalogs and cluster-finding in future surveys.
[ { "version": "v1", "created": "Fri, 1 Jun 2007 20:04:45 GMT" }, { "version": "v2", "created": "Mon, 17 Sep 2007 14:21:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Cohn", "J. D.", "" ], [ "Evrard", "A. E.", "" ], [ "White", "M.", "" ], [ "Croton", "D.", "" ], [ "Ellingson", "E.", "" ] ]
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cs/0505017
Merc\`e Claverol
Manuel Abellanas, Merc\`e Claverol, and Ferran Hurtado
Point set stratification and Delaunay depth
17 pages, 16 figures
null
null
null
cs.CG
null
In the study of depth functions it is important to decide whether we want such a function to be sensitive to multimodality or not. In this paper we analyze the Delaunay depth function, which is sensitive to multimodality and compare this depth with others, as convex depth and location depth. We study the stratification that Delaunay depth induces in the point set (layers) and in the whole plane (levels), and we develop an algorithm for computing the Delaunay depth contours, associated to a point set in the plane, with running time O(n log^2 n). The depth of a query point p with respect to a data set S in the plane is the depth of p in the union of S and p. When S and p are given in the input the Delaunay depth can be computed in O(n log n), and we prove that this value is optimal.
[ { "version": "v1", "created": "Sun, 8 May 2005 16:36:42 GMT" } ]
2007-05-23T00:00:00
[ [ "Abellanas", "Manuel", "" ], [ "Claverol", "Mercè", "" ], [ "Hurtado", "Ferran", "" ] ]
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2401.17398
Cristian Stelea
Vitalie Lungu, Marina-Aura Dariescu, Ciprian Dariescu and Cristian Stelea
Charged particles moving around a spherically symmetric dilatonic black hole
27 pages, 9 figures, v3. major revision, added references. Matches the published version
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hep-th gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For the static spherically symmetric dilatonic black hole described by the Gibbons-Maeda-Garfinkle-Horowitz-Strominger geometry, we analyze the timelike trajectories for electrically charged test particles. Both cases of an electric black hole and a magnetic one are considered. Finally, we are obtaining the solution to the Klein--Gordon equation in terms of Heun confluent functions and the corresponding energy spectrum. A special attention is given to the role of the dilaton parameter.
[ { "version": "v1", "created": "Tue, 30 Jan 2024 19:29:55 GMT" }, { "version": "v2", "created": "Mon, 5 Feb 2024 19:50:40 GMT" }, { "version": "v3", "created": "Sun, 12 May 2024 11:08:29 GMT" } ]
2024-05-14T00:00:00
[ [ "Lungu", "Vitalie", "" ], [ "Dariescu", "Marina-Aura", "" ], [ "Dariescu", "Ciprian", "" ], [ "Stelea", "Cristian", "" ] ]
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physics/0601085
Kyung Hyuk Kim
Kyung Hyuk Kim and Hong Qian
Fluctuation Theorems of Brownian Particles Controlled by a Maxwell's Demon
4 pages
Phys. Rev. E 75, 022102 (2007)
10.1103/PhysRevE.75.022102
null
physics.class-ph
null
We study the stochastic dynamics of Brownian particles in a heat bath and subject to an active feedback control by an external, Maxwell's demon-like agent. The agent uses the information of the velocity of a particle and reduces its thermal agitation by applying a force. The entropy of the particle and the heat bath as a whole, thus, reduces. Entropy pumping [Phys. Rev. Lett. 93, 120602 (2004)] quantifies the entropy reduction. We discover that the entropy pumping has a dual role of work and heat contributing to free energy changes and entropy production of the open-system with the feedback control. Generalized Jarzynski equality and fluctuation theorems for work functional and entropy production are developed with the presence of the entropy pumping.
[ { "version": "v1", "created": "Thu, 12 Jan 2006 10:43:49 GMT" } ]
2007-05-23T00:00:00
[ [ "Kim", "Kyung Hyuk", "" ], [ "Qian", "Hong", "" ] ]
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2006.00058
Christopher George
Christopher A. George, Eduardo A. Barrera, Kenric P. Nelson
Applying the Decisiveness and Robustness Metrics to Convolutional Neural Networks
null
null
null
null
cs.LG cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We review three recently-proposed classifier quality metrics and consider their suitability for large-scale classification challenges such as applying convolutional neural networks to the 1000-class ImageNet dataset. These metrics, referred to as the "geometric accuracy," "decisiveness," and "robustness," are based on the generalized mean ($\rho$ equals 0, 1, and -2/3, respectively) of the classifier's self-reported and measured probabilities of correct classification. We also propose some minor clarifications to standardize the metric definitions. With these updates, we show some examples of calculating the metrics using deep convolutional neural networks (AlexNet and DenseNet) acting on large datasets (the German Traffic Sign Recognition Benchmark and ImageNet).
[ { "version": "v1", "created": "Fri, 29 May 2020 20:05:06 GMT" } ]
2020-06-02T00:00:00
[ [ "George", "Christopher A.", "" ], [ "Barrera", "Eduardo A.", "" ], [ "Nelson", "Kenric P.", "" ] ]
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1902.03268
Sean Li
Sean Li
Stratified $\beta$-numbers and traveling salesman in Carnot groups
Proved new statements about insufficiency of non-stratified beta numbers (Prop 1.4) as well as different characterizations of stratified betas (Prop 1.6). Implemented referee suggested simplifications of many proofs. Fixed many typos
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null
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math.MG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a modified version of P. Jones's $\beta$-numbers for Carnot groups which we call {\it stratified $\beta$-numbers}. We show that an analogue of Jones's traveling salesman theorem on 1-rectifiability of sets holds for any Carnot group if we replace previous notions of $\beta$-numbers in Carnot groups with stratified $\beta$-numbers. As we generalize both directions of the traveling salesman theorem, we get a characterization of subsets of Carnot groups that lie on finite length rectifiable curves. Our proof expands upon previous analysis of the Hebisch-Sikora norm for Carnot groups. In particular, we find new estimates on the drift between almost parallel line segments that take advantage of the stratified $\beta$'s and also develop a Taylor expansion technique of the norm. We also give an example of a Carnot group for which a traveling salesman theorem based on the unmodified $\beta$-numbers must exhibit a gap between the necessary and sufficient directions.
[ { "version": "v1", "created": "Fri, 8 Feb 2019 19:42:00 GMT" }, { "version": "v2", "created": "Fri, 25 Jun 2021 11:37:54 GMT" } ]
2021-06-28T00:00:00
[ [ "Li", "Sean", "" ] ]
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2109.08237
Efrat Shimron
Efrat Shimron, Jonathan I. Tamir, Ke Wang, Michael Lustig
Subtle Data Crimes: Naively training machine learning algorithms could lead to overly-optimistic results
16 pages, 7 figures, two tables. Submitted to a journal
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null
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cs.LG
http://creativecommons.org/licenses/by/4.0/
While open databases are an important resource in the Deep Learning (DL) era, they are sometimes used "off-label": data published for one task are used for training algorithms for a different one. This work aims to highlight that in some cases, this common practice may lead to biased, overly-optimistic results. We demonstrate this phenomenon for inverse problem solvers and show how their biased performance stems from hidden data preprocessing pipelines. We describe two preprocessing pipelines typical of open-access databases and study their effects on three well-established algorithms developed for Magnetic Resonance Imaging (MRI) reconstruction: Compressed Sensing (CS), Dictionary Learning (DictL), and DL. In this large-scale study we performed extensive computations. Our results demonstrate that the CS, DictL and DL algorithms yield systematically biased results when naively trained on seemingly-appropriate data: the Normalized Root Mean Square Error (NRMSE) improves consistently with the preprocessing extent, showing an artificial increase of 25%-48% in some cases. Since this phenomenon is generally unknown, biased results are sometimes published as state-of-the-art; we refer to that as subtle data crimes. This work hence raises a red flag regarding naive off-label usage of Big Data and reveals the vulnerability of modern inverse problem solvers to the resulting bias.
[ { "version": "v1", "created": "Thu, 16 Sep 2021 22:00:15 GMT" }, { "version": "v2", "created": "Fri, 24 Sep 2021 01:31:51 GMT" }, { "version": "v3", "created": "Tue, 14 Dec 2021 05:35:43 GMT" } ]
2021-12-15T00:00:00
[ [ "Shimron", "Efrat", "" ], [ "Tamir", "Jonathan I.", "" ], [ "Wang", "Ke", "" ], [ "Lustig", "Michael", "" ] ]
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0706.1367
Jesus I?arrea
Jesus Inarrea
Anharmonic behavior in Microwave-driven resistivity oscillations in Hall bars
3 pages, 2 figures. Accepted in Applied Physics Letters
null
10.1063/1.2751585
null
cond-mat.mes-hall
null
We analyzed the magnetoresistivity of a two-dimensional electron system excited by microwave radiation in a regime of high intensities and low frequencies. In such a regime, recent experiments show that different features appear in the magnetoresistivity response which suggest an anharmonic behavior. These features consist mainly in distorted oscillations and new resonance peaks at the subharmonics of the cyclotron frequency. We follow the model of microwave-driven electron orbits motion which become anharmonic when the ratio of microwave intensity to microwave frequency is large enough.
[ { "version": "v1", "created": "Sun, 10 Jun 2007 17:56:08 GMT" } ]
2009-11-13T00:00:00
[ [ "Inarrea", "Jesus", "" ] ]
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1806.05128
Sven Jarohs
Nicola Abatangelo, Serena Dipierro, Mouhamed Moustapha Fall, Sven Jarohs, Alberto Salda\~na
Positive powers of the Laplacian in the half-space under Dirichlet boundary conditions
null
null
null
null
math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present explicit formulas for solutions to nonhomogeneous boundary value problems involving any positive power of the Laplacian in the half-space. For non-integer powers the operator becomes nonlocal and this requires a suitable extension of Dirichlet-type boundary conditions. A key ingredient in our proofs is a point inversion transformation which preserves harmonicity and allows us to use known results for the ball. We include uniqueness statements, regularity estimates, and describe the growth or decay of solutions at infinity and at the boundary.
[ { "version": "v1", "created": "Wed, 13 Jun 2018 16:03:42 GMT" }, { "version": "v2", "created": "Mon, 13 Aug 2018 06:27:35 GMT" } ]
2018-08-14T00:00:00
[ [ "Abatangelo", "Nicola", "" ], [ "Dipierro", "Serena", "" ], [ "Fall", "Mouhamed Moustapha", "" ], [ "Jarohs", "Sven", "" ], [ "Saldaña", "Alberto", "" ] ]
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1404.0368
Ricardo W. Nunes
R. Longuinhos, E. A. Moujaes, S. S. Alexandre, and R. W. Nunes
Theoretical chemistry of $\alpha$-graphyne: functionalization, symmetry breaking, and generation of Dirac-fermion mass
9 pages in two column format, 7 figures and 2 tables Submitted for publication in Chemistry of Materials
null
null
null
cond-mat.mtrl-sci cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the electronic structure and lattice stability of pristine and functionalized (with either hydrogen or oxygen) $\alpha$-graphyne systems. We identify lattice instabilities due to soft-phonon modes, and describe two mechanisms leading to gap opening in the Dirac-fermion electronic spectrum of these systems: symmetry breaking, connected with the lattice instabilities, and partial incorporation of an $sp^3$-hybrid character in the covalent-bonding network of a buckled hydrogenated $\alpha$-graphyne lattice that retains the symmetries of the parent pristine $\alpha$-graphyne. In the case of an oxygen-functionalized $\alpha$-graphyne structure, each O atom binds asymmetrically to two twofold-coordinated C atoms, breaking inversion and mirror symmetries, and leading to the opening of a sizeable gap of 0.22 eV at the Dirac point. Generally, mirror symmetries are found to suffice for the occurrence of gapless Dirac cones in these $\alpha$-graphyne systems, even in the absence of inversion symmetry centers. Moreover, we analyze the gapless and gapped Dirac cones of pristine and functionalized $\alpha$-graphynes from the perspective of the dispersion relations for massless and massive free Dirac fermions. We find that mirror-symmetry breaking mimics a Dirac-fermion mass-generation mechanism in the oxygen-functionalized $\alpha$-graphyne, leading to gap opening and to isotropic electronic dispersions with a rather small electron-hole asymmetry. In the hydrogen-functionalized case, we find that carriers show a remarkable anisotropy, behaving as massless fermions along the M-K line in the Brillouin zone and as massive fermions along the $\Gamma$-K line.
[ { "version": "v1", "created": "Tue, 1 Apr 2014 19:51:37 GMT" } ]
2014-04-02T00:00:00
[ [ "Longuinhos", "R.", "" ], [ "Moujaes", "E. A.", "" ], [ "Alexandre", "S. S.", "" ], [ "Nunes", "R. W.", "" ] ]
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1207.4557
Enrico Bozzo
E. Bozzo, C. Ferrigno, M. Tuerler, A. Manousakis, and M. Falanga
IGRJ18179-1621: An obscured X-ray pulsar discovered by INTEGRAL
Accepted for publication on A&A V2. Corrected few typos
null
10.1051/0004-6361/201219344
null
astro-ph.HE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on all the INTEGRAL and Swift data collected during the first outburst observed from IGRJ18179-1621. The broad-band spectral analysis showed that the X-ray emission from the source is heavily absorbed (N_H~10^23 cm^-2), and well described by a flat power-law with a high energy rollover (cutoff energy 9-12 keV, e-folding energy 4-7 keV). We found some evidence of a cyclotron absorption feature at 22\pm1 keV. Together with the pulsations at 11.8s discovered in the XRT data, this evidence would suggest that IGRJ18179-1621 is an obscured magnetized accreting neutron star, possibly part of a supergiant high mass X-ray binary or a Be X-ray binary system.
[ { "version": "v1", "created": "Thu, 19 Jul 2012 06:10:53 GMT" }, { "version": "v2", "created": "Sun, 22 Jul 2012 05:37:15 GMT" } ]
2015-06-05T00:00:00
[ [ "Bozzo", "E.", "" ], [ "Ferrigno", "C.", "" ], [ "Tuerler", "M.", "" ], [ "Manousakis", "A.", "" ], [ "Falanga", "M.", "" ] ]
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0912.1906
Gary Ballantyne Dr.
Gary J. Ballantyne
Envelope Soliton Oscillator for UWB
10 pages, 2 figures
null
null
null
nlin.PS nlin.AO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An electronic oscillator is shown to support an envelope soliton pulse. The oscillator comprises a loop, formed by a nonlinear transmission line, an amplifier, a bandpass filter and a saturable absorber. The soliton is suitable for ultra-wideband radio-frequency communication; its existence and stability are demonstrated with simulations.
[ { "version": "v1", "created": "Thu, 10 Dec 2009 02:23:24 GMT" } ]
2009-12-11T00:00:00
[ [ "Ballantyne", "Gary J.", "" ] ]
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1312.6279
Michal Czakon
P. Baernreuther, M. Czakon and P. Fiedler
Virtual amplitudes and threshold behaviour of hadronic top-quark pair-production cross sections
28 pages, 3 figures, 4 tables, results for the virtual amplitudes attached in Mathematica format
null
10.1007/JHEP02(2014)078
TTK-13-28
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the two-loop virtual amplitudes for the production of a top-quark pair in gluon fusion. The evaluation method is based on a numerical solution of differential equations for master integrals in function of the quark velocity and scattering angle starting from a boundary at high-energy. The results are given for the renormalized infrared finite remainders on a large grid and have recently been used in the calculation of the total cross sections at the next-to-next-to-leading order. For convenience, we also give the known results for the quark annihilation case on the same grid. Outside of the kinematical range covered by the grid, we provide threshold and high-energy expansions. From expansions of the two-loop virtual amplitudes, we determine the threshold behavior of the total cross sections at next-to-next-to-leading order for the quark annihilation and gluon fusion channels including previously unknown constant terms. In our analysis of the quark annihilation channel, we uncover the presence of a velocity enhanced logarithm of Coulombic origin, which was missed in a previous study.
[ { "version": "v1", "created": "Sat, 21 Dec 2013 17:53:30 GMT" } ]
2015-06-18T00:00:00
[ [ "Baernreuther", "P.", "" ], [ "Czakon", "M.", "" ], [ "Fiedler", "P.", "" ] ]
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2011.09622
Pouria Dadras
Pouria Dadras, Alexei Kitaev
Perturbative calculations of entanglement entropy
17 pages, 7 figures, fixing an error in section 3.5 has lead to a much simpler result. An alternative, shorter derivation is given. (new contributions by a new author, Pengfei Zhang.)
null
10.1007/JHEP03(2021)198
null
hep-th gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper is an attempt to extend the recent understanding of the Page curve for evaporating black holes to more general systems coupled to a heat bath. Although calculating the von Neumann entropy by the replica trick is usually a challenge, we have identified two solvable cases. For the initial section of the Page curve, we sum up the perturbation series in the system-bath coupling $\kappa$; the most interesting contribution is of order $2s$, where $s$ is the number of replicas. For the saturated regime, we consider the effect of an external impulse on the entropy at a later time and relate it to OTOCs. A significant simplification occurs in the maximal chaos case such that the effect may be interpreted in terms of an intermediate object, analogous to the branching surface of a replica wormhole.
[ { "version": "v1", "created": "Thu, 19 Nov 2020 02:51:04 GMT" }, { "version": "v2", "created": "Sun, 30 Oct 2022 19:28:58 GMT" } ]
2022-11-01T00:00:00
[ [ "Dadras", "Pouria", "" ], [ "Kitaev", "Alexei", "" ] ]
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2407.14839
ShiHong Ding
Shihong Ding, Long Yang, Luo Luo, Cong Fang
Optimizing over Multiple Distributions under Generalized Quasar-Convexity Condition
null
null
null
null
math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study a typical optimization model where the optimization variable is composed of multiple probability distributions. Though the model appears frequently in practice, such as for policy problems, it lacks specific analysis in the general setting. For this optimization problem, we propose a new structural condition/landscape description named generalized quasar-convexity (GQC) beyond the realms of convexity. In contrast to original quasar-convexity \citep{hinder2020near}, GQC allows an individual quasar-convex parameter $\gamma_i$ for each variable block $i$ and the smaller of $\gamma_i$ implies less block-convexity. To minimize the objective function, we consider a generalized oracle termed as the internal function that includes the standard gradient oracle as a special case. We provide optimistic mirror descent (OMD) for multiple distributions and prove that the algorithm can achieve an adaptive $\tilde{\mathcal{O}}((\sum_{i=1}^d1/\gamma_i)\epsilon^{-1})$ iteration complexity to find an $epsilon$-suboptimal global solution without pre-known the exact values of $\gamma_i$ when the objective admits "polynomial-like" structural. Notably, it achieves iteration complexity that does not explicitly depend on the number of distributions and strictly faster $(\sum_{i=1}^d 1/\gamma_i \text{ v.s. } d\max_{i\in[1:d]} 1/\gamma_i)$ than mirror decent methods. We also extend GQC to the minimax optimization problem proposing the generalized quasar-convexity-concavity (GQCC) condition and a decentralized variant of OMD with regularization. Finally, we show the applications of our algorithmic framework on discounted Markov Decision Processes problem and Markov games, which bring new insights on the landscape analysis of reinforcement learning.
[ { "version": "v1", "created": "Sat, 20 Jul 2024 10:47:34 GMT" }, { "version": "v2", "created": "Thu, 24 Oct 2024 15:52:18 GMT" } ]
2024-10-25T00:00:00
[ [ "Ding", "Shihong", "" ], [ "Yang", "Long", "" ], [ "Luo", "Luo", "" ], [ "Fang", "Cong", "" ] ]
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1103.4250
Aya Ishihara
IceCube Collaboration: R. Abbasi, Y. Abdou, T. Abu-Zayyad, J. Adams, J. A. Aguilar, M. Ahlers, K. Andeen, J. Auffenberg, X. Bai, M. Baker, S. W. Barwick, R. Bay, J. L. Bazo Alba, K. Beattie, J. J. Beatty, S. Bechet, J. K. Becker, K.-H. Becker, M. L. Benabderrahmane, S. BenZvi, J. Berdermann, P. Berghaus, D. Berley, E. Bernardini, D. Bertrand, D. Z. Besson, D. Bindig, M. Bissok, E. Blaufuss, J. Blumenthal, D. J. Boersma, C. Bohm, D. Bose, S. B\"oser, O. Botner, J. Braun, A. M. Brown, S. Buitink, M. Carson, D. Chirkin, B. Christy, J. Clem, F. Clevermann, S. Cohen, C. Colnard, D. F. Cowen, M. V. D'Agostino, M. Danninger, J. Daughhetee, J. C. Davis, C. De Clercq, L. Demir\"ors, T. Denger, O. Depaepe, F. Descamps, P. Desiati, G. de Vries-Uiterweerd, T. DeYoung, J. C. D\'iaz-V\'elez, M. Dierckxsens, J. Dreyer, J. P. Dumm, R. Ehrlich, J. Eisch, R. W. Ellsworth, O. Engdeg{\aa}rd, S. Euler, P. A. Evenson, O. Fadiran, A. R. Fazely, A. Fedynitch, T. Feusels, K. Filimonov, C. Finley, T. Fischer-Wasels, M. M. Foerster, B. D. Fox, A. Franckowiak, R. Franke, T. K. Gaisser, J. Gallagher, M. Geisler, L. Gerhardt, L. Gladstone, T. Gl\"usenkamp, A. Goldschmidt, J. A. Goodman, D. Gora, D. Grant, T. Griesel, A. Gro{\ss}, S. Grullon, M. Gurtner, C. Ha, A. Hallgren, F. Halzen, K. Han, K. Hanson, D. Heinen, K. Helbing, P. Herquet, S. Hickford, G. C. Hill, K. D. Hoffman, A. Homeier, K. Hoshina, D. Hubert, W. Huelsnitz, J.-P. H\"ul{\ss}, P. O. Hulth, K. Hultqvist, S. Hussain, A. Ishihara, J. Jacobsen, G. S. Japaridze, H. Johansson, J. M. Joseph, K.-H. Kampert, A. Kappes, T. Karg, A. Karle, J. L. Kelley, P. Kenny, J. Kiryluk, F. Kislat, S. R. Klein, J.-H. K\"ohne, G. Kohnen, H. Kolanoski, L. K\"opke, S. Kopper, D. J. Koskinen, M. Kowalski, T. Kowarik, M. Krasberg, T. Krings, G. Kroll, T. Kuwabara, M. Labare, S. Lafebre, K. Laihem, H. Landsman, M. J. Larson, R. Lauer, J. L\"unemann, J. Madsen, P. Majumdar, A. Marotta, R. Maruyama, K. Mase, H. S. Matis, K. Meagher, M. Merck, P. M\'esz\'aros, T. Meures, E. Middell, N. Milke, J. Miller, T. Montaruli, R. Morse, S. M. Movit, R. Nahnhauer, J. W. Nam, U. Naumann, P. Nie{\ss}en, D. R. Nygren, S. Odrowski, A. Olivas, M. Olivo, A. O'Murchadha, M. Ono, S. Panknin, L. Paul, C. P\'erez de los Heros, J. Petrovic, A. Piegsa, D. Pieloth, R. Porrata, J. Posselt, P. B. Price, G. T. Przybylski, K. Rawlins, P. Redl, E. Resconi, W. Rhode, M. Ribordy, A. Rizzo, J. P. Rodrigues, P. Roth, F. Rothmaier, C. Rott, T. Ruhe, D. Rutledge, B. Ruzybayev, D. Ryckbosch, H.-G. Sander, M. Santander, S. Sarkar, K. Schatto, T. Schmidt, A. Sch\"onwald, A. Schukraft, A. Schultes, O. Schulz, M. Schunck, D. Seckel, B. Semburg, S. H. Seo, Y. Sestayo, S. Seunarine, A. Silvestri, A. Slipak, G. M. Spiczak, C. Spiering, M. Stamatikos, T. Stanev, G. Stephens, T. Stezelberger, R. G. Stokstad, A. St\"ossl, S. Stoyanov, E. A. Strahler, T. Straszheim, M. St\"ur, G. W. Sullivan, Q. Swillens, H. Taavola, I. Taboada, A. Tamburro, A. Tepe, S. Ter-Antonyan, S. Tilav, P. A. Toale, S. Toscano, D. Tosi, D. Tur\v{c}an, N. van Eijndhoven, J. Vandenbroucke, A. Van Overloop, J. van Santen, M. Vehring, M. Voge, C. Walck, T. Waldenmaier, M. Wallraff, M. Walter, Ch. Weaver, C. Wendt, S. Westerhoff, N. Whitehorn, K. Wiebe, C. H. Wiebusch, D. R. Williams, R. Wischnewski, H. Wissing, M. Wolf, T. R. Wood, K. Woschnagg, C. Xu, X. W. Xu, G. Yodh, S. Yoshida, P. Zarzhitsky
Constraints on the Extremely-high Energy Cosmic Neutrino Flux with the IceCube 2008-2009 Data
9 pages, 4 figures. This corresponds to the paper Phys.Rev.D 83, 092003(2011), and its erratum Phys.Rev.D 84, 079902(2011)
Phys.Rev.D83:092003(2011); Phys.Rev.D84:079902(2011)
10.1103/PhysRevD.83.092003 10.1103/PhysRevD.84.079902
null
astro-ph.CO astro-ph.IM hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on a search for extremely-high energy neutrinos with energies greater than $10^6$ GeV using the data taken with the IceCube detector at the South Pole. The data was collected between April 2008 and May 2009 with the half completed IceCube array. The absence of signal candidate events in the sample of 333.5 days of livetime significantly improves model independent limit from previous searches and allows to place a limit on the diffuse flux of cosmic neutrinos with an $E^{-2}$ spectrum in the energy range $2.0 \times 10^{6}$ $-$ $6.3 \times 10^{9}$ GeV to a level of $E^2 \phi \leq 3.6 \times 10^{-8}$ ${\rm GeV cm^{-2} sec^{-1}sr^{-1}}$.
[ { "version": "v1", "created": "Tue, 22 Mar 2011 12:07:38 GMT" }, { "version": "v2", "created": "Thu, 19 May 2011 05:45:16 GMT" }, { "version": "v3", "created": "Tue, 25 Oct 2011 06:12:31 GMT" } ]
2016-07-12T00:00:00
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2006.05916
Philipp del Hougne
Philipp del Hougne, Dmitry V. Savin, Olivier Legrand, Ulrich Kuhl
Implementing Non-Universal Features with a Random Matrix Theory Approach: Application to Space-to-Configuration Multiplexing
5 pages including 4 figures + 7 pages Supplemental Material
Phys. Rev. E 102, 010201 (2020)
10.1103/PhysRevE.102.010201
null
physics.app-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the efficiency of multiplexing spatially encoded information across random configurations of a metasurface-programmable chaotic cavity in the microwave domain. The distribution of the effective rank of the channel matrix is studied to quantify the channel diversity and to assess a specific system's performance. System-specific features such as unstirred field components give rise to nontrivial inter-channel correlations and need to be properly accounted for in modelling based on random matrix theory. To address this challenge, we propose a two-step hybrid approach. Based on an ensemble of experimentally measured scattering matrices for different random metasurface configurations, we first learn a system-specific pair of coupling matrix and unstirred contribution to the Hamiltonian, and then add an appropriately weighted stirred contribution. We verify that our method is capable of reproducing the experimentally found distribution of the effective rank with good accuracy. The approach can also be applied to other wave phenomena in complex media.
[ { "version": "v1", "created": "Wed, 10 Jun 2020 16:07:12 GMT" } ]
2020-08-05T00:00:00
[ [ "del Hougne", "Philipp", "" ], [ "Savin", "Dmitry V.", "" ], [ "Legrand", "Olivier", "" ], [ "Kuhl", "Ulrich", "" ] ]
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2204.12789
Nicolas Boull\'e
Nicolas Boull\'e, Seick Kim, Tianyi Shi, Alex Townsend
Learning Green's functions associated with time-dependent partial differential equations
34 pages, 3 figures
Journal of Machine Learning Research 23 (2022) 1-34
null
null
math.NA cs.LG cs.NA math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Neural operators are a popular technique in scientific machine learning to learn a mathematical model of the behavior of unknown physical systems from data. Neural operators are especially useful to learn solution operators associated with partial differential equations (PDEs) from pairs of forcing functions and solutions when numerical solvers are not available or the underlying physics is poorly understood. In this work, we attempt to provide theoretical foundations to understand the amount of training data needed to learn time-dependent PDEs. Given input-output pairs from a parabolic PDE in any spatial dimension $n\geq 1$, we derive the first theoretically rigorous scheme for learning the associated solution operator, which takes the form of a convolution with a Green's function $G$. Until now, rigorously learning Green's functions associated with time-dependent PDEs has been a major challenge in the field of scientific machine learning because $G$ may not be square-integrable when $n>1$, and time-dependent PDEs have transient dynamics. By combining the hierarchical low-rank structure of $G$ together with randomized numerical linear algebra, we construct an approximant to $G$ that achieves a relative error of $\smash{\mathcal{O}(\Gamma_\epsilon^{-1/2}\epsilon)}$ in the $L^1$-norm with high probability by using at most $\smash{\mathcal{O}(\epsilon^{-\frac{n+2}{2}}\log(1/\epsilon))}$ input-output training pairs, where $\Gamma_\epsilon$ is a measure of the quality of the training dataset for learning $G$, and $\epsilon>0$ is sufficiently small.
[ { "version": "v1", "created": "Wed, 27 Apr 2022 09:23:39 GMT" }, { "version": "v2", "created": "Thu, 4 Aug 2022 12:52:55 GMT" } ]
2022-08-05T00:00:00
[ [ "Boullé", "Nicolas", "" ], [ "Kim", "Seick", "" ], [ "Shi", "Tianyi", "" ], [ "Townsend", "Alex", "" ] ]
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2402.15683
David Gamba
David Gamba, Yulin Yu, Yuan Yuan, Grant Schoenebeck, Daniel M. Romero
Exit Ripple Effects: Understanding the Disruption of Socialization Networks Following Employee Departures
Published in proceedings of the ACM Web Conference 2024 (WWW '24), May 13--17, 2024, Singapore, Singapore
null
10.1145/3589334.3645634
null
cs.SI cs.CY physics.soc-ph
http://creativecommons.org/licenses/by-nc-sa/4.0/
Amidst growing uncertainty and frequent restructurings, the impacts of employee exits are becoming one of the central concerns for organizations. Using rich communication data from a large holding company, we examine the effects of employee departures on socialization networks among the remaining coworkers. Specifically, we investigate how network metrics change among people who historically interacted with departing employees. We find evidence of ``breakdown" in communication among the remaining coworkers, who tend to become less connected with fewer interactions after their coworkers' departure. This effect appears to be moderated by both external factors, such as periods of high organizational stress, and internal factors, such as the characteristics of the departing employee. At the external level, periods of high stress correspond to greater communication breakdown; at the internal level, however, we find patterns suggesting individuals may end up better positioned in their networks after a network neighbor's departure. Overall, our study provides critical insights into managing workforce changes and preserving communication dynamics in the face of employee exits.
[ { "version": "v1", "created": "Sat, 24 Feb 2024 02:02:53 GMT" } ]
2024-02-27T00:00:00
[ [ "Gamba", "David", "" ], [ "Yu", "Yulin", "" ], [ "Yuan", "Yuan", "" ], [ "Schoenebeck", "Grant", "" ], [ "Romero", "Daniel M.", "" ] ]
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0806.2742
Yaroslav Kartashov
Fangwei Ye, Yaroslav V. Kartashov, Victor A. Vysloukh, Lluis Torner
Nonlinear switching of low-index defect modes in photonic lattices
13 pages, 4 figures, to appear in Physical Review A
Physical Review A 78, 013847 (2008)
10.1103/PhysRevA.78.013847
null
physics.optics nlin.PS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We address nonlinear signal switching between two low-index defect channels induced in periodic optical lattices. In contrast to conventional directional couplers, where the guiding mechanism is total internal reflection or refraction, in such Bragg-type coupler, the guidance is of a photonic-bandgap origin. The coupling length in the low-index coupler is controlled by the lattice parameters and by the channel spacing. In the nonlinear regime the Bragg-type coupler behaves as an all-optical switch, exhibiting a remarkable difference of switching power for focusing versus defocusing nonlinearity.
[ { "version": "v1", "created": "Tue, 17 Jun 2008 09:57:21 GMT" } ]
2009-11-13T00:00:00
[ [ "Ye", "Fangwei", "" ], [ "Kartashov", "Yaroslav V.", "" ], [ "Vysloukh", "Victor A.", "" ], [ "Torner", "Lluis", "" ] ]
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1905.10351
Cornelius Fritz
Cornelius Fritz, Michael Lebacher, G\"oran Kauermann
Tempus Volat, Hora Fugit -- A Survey of Tie-Oriented Dynamic Network Models in Discrete and Continuous Time
null
null
10.1111/stan.12198
null
cs.SI stat.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Given the growing number of available tools for modeling dynamic networks, the choice of a suitable model becomes central. The goal of this survey is to provide an overview of tie-oriented dynamic network models. The survey is focused on introducing binary network models with their corresponding assumptions, advantages, and shortfalls. The models are divided according to generating processes, operating in discrete and continuous time. First, we introduce the Temporal Exponential Random Graph Model (TERGM) and the Separable TERGM (STERGM), both being time-discrete models. These models are then contrasted with continuous process models, focusing on the Relational Event Model (REM). We additionally show how the REM can handle time-clustered observations, i.e., continuous time data observed at discrete time points. Besides the discussion of theoretical properties and fitting procedures, we specifically focus on the application of the models on two networks that represent international arms transfers and email exchange. The data allow to demonstrate the applicability and interpretation of the network models.
[ { "version": "v1", "created": "Thu, 23 May 2019 13:47:59 GMT" }, { "version": "v2", "created": "Mon, 26 Aug 2019 08:26:50 GMT" }, { "version": "v3", "created": "Wed, 28 Aug 2019 15:36:05 GMT" } ]
2022-01-05T00:00:00
[ [ "Fritz", "Cornelius", "" ], [ "Lebacher", "Michael", "" ], [ "Kauermann", "Göran", "" ] ]
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1604.02192
Chiara Tonini
Chiara Tonini, Simon J. Mutch, Darren J. Croton, J. Stuart B. Wyithe
The growth of disks and bulges during hierarchical galaxy formation. I: fast evolution vs secular processes
Accepted on MNRAS; 24 pages, 11 figures
null
10.1093/mnras/stw956
null
astro-ph.GA astro-ph.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a theoretical model for the evolution of mass, angular momentum and size of galaxy disks and bulges, and we implement it into the semi-analytic galaxy formation code SAGE. The model follows both secular and violent evolutionary channels, including smooth accretion, disk instabilities, minor and major mergers. We find that the combination of our recipe with hierarchical clustering produces two distinct populations of bulges: merger-driven bulges, akin to classical bulges and ellipticals, and instability-driven bulges, akin to secular (or pseudo-)bulges. The model mostly reproduces the mass-size relation of gaseous and stellar disks, the evolution of the mass-size relation of ellipticals, the Faber-Jackson relation, and the magnitude-colour diagram of classical and secular bulges. The model predicts only a small overlap of merger-driven and instability-driven components in the same galaxy, and predicts different bulge types as a function of galaxy mass and disk fraction. Bulge type also affects the star formation rate and colour at a given luminosity. The model predicts a population of merger-driven red ellipticals that dominate both the low-mass and high-mass ends of the galaxy population, and span all dynamical ages; merger-driven bulges in disk galaxies are dynamically old and do not interfere with subsequent evolution of the star-forming component. Instability-driven bulges dominate the population at intermediate galaxy masses, especially thriving in massive disks. The model green valley is exclusively populated by instability-driven bulge hosts. Through the present implementation the mass accretion history is perceivable in the galaxy structure, morphology and colours.
[ { "version": "v1", "created": "Thu, 7 Apr 2016 23:04:03 GMT" }, { "version": "v2", "created": "Wed, 20 Apr 2016 04:13:27 GMT" } ]
2016-04-27T00:00:00
[ [ "Tonini", "Chiara", "" ], [ "Mutch", "Simon J.", "" ], [ "Croton", "Darren J.", "" ], [ "Wyithe", "J. Stuart B.", "" ] ]
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2208.04936
Weiyu Zhang
Becky Pham, Weiyu Zhang
Young women's cognition of commercial digital signage in shopping malls: A situated action approach
A previous version of the paper was presented in June 2016 at the 66th Annual Conference of the International Communication Association, Fukuoka, Japan
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cs.HC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Existing literature on digital signage is growing but has not always emphasized the cognitive processes of the audience. This research aims to address this gap by studying how young women in Singapore cognize commercial digital signage in shopping malls and what cause them to do so. Using cognitive ethnography and taking the situated action approach, our findings suggest a comprehensive list of factors, both external and internal, that influence young women's cognition of commercial digital signage in both positive and negative ways. The research's practical implications are discussed.
[ { "version": "v1", "created": "Thu, 4 Aug 2022 05:44:18 GMT" } ]
2022-08-11T00:00:00
[ [ "Pham", "Becky", "" ], [ "Zhang", "Weiyu", "" ] ]
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chem-ph/9506004
Bo Soderberg
B. J\"onsson, M. Ullner (Phys. Chemistry 2, Lund U.), C. Peterson, O. Sommelius and B. S\"oderberg (Theor. Phys. 2, Lund U.)
Titrating Polyelectrolytes - Variational Calculations and Monte Carlo Simulations
22 pages, PostScript, 9 figures
null
null
LU TP 95-1
chem-ph cond-mat hep-lat physics.chem-ph
null
Variational methods are used to calculate structural and thermodynamical properties of a titrating polyelectrolyte in a discrete representation. The Coulomb interactions are emulated by harmonic repulsive forces, the force constants being used as variational parameters to minimize the free energy. For the titrating charges, a mean field approach is used. The accuracy is tested against Monte Carlo data for up to 1000 monomers. For an unscreened chain, excellent agreement is obtained for the end-to-end distance and the apparent dissociation constant. With screening, the thermodynamical properties are invariably well described, although the structural agreement deteriorates. A very simple rigid-rod approximation is also considered, giving surprisingly good results for certain properties.
[ { "version": "v1", "created": "Thu, 15 Jun 1995 13:55:43 GMT" } ]
2008-02-03T00:00:00
[ [ "Jönsson", "B.", "", "Phys. Chemistry 2, Lund U." ], [ "Ullner", "M.", "", "Phys. Chemistry 2, Lund U." ], [ "Peterson", "C.", "", "Theor. Phys. 2, Lund U." ], [ "Sommelius", "O.", "", "Theor. Phys. 2, Lund U." ], [ "Söderberg", "B.", "", "Theor. Phys. 2, Lund U." ] ]
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1705.06181
Nikolai Dokuchaev
Nikolai Dokuchaev
Spectrum degeneracy for functions on branching lines and impact on extrapolation and sampling
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The paper studies functions defined on continuous branching lines connected into a system. A notion of spectrum degeneracy for these functions is introduced. This degeneracy is based on the properties of the Fourier transforms for processes representing functions on the branches. It is shown that processes with this spectrum degeneracy are everywhere dense in the set of processes equivalent to functions on the branching lines. Some applications to extrapolation and sampling are considered.
[ { "version": "v1", "created": "Wed, 17 May 2017 14:39:32 GMT" }, { "version": "v2", "created": "Sat, 20 May 2017 01:43:54 GMT" }, { "version": "v3", "created": "Sun, 21 Oct 2018 06:26:46 GMT" } ]
2018-10-23T00:00:00
[ [ "Dokuchaev", "Nikolai", "" ] ]
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cond-mat/0208576
Henning Schomerus
R. G. Nazmitdinov, H.-S. Sim, H. Schomerus, I. Rotter
Shot noise and transport in small quantum cavities with large openings
4 pages, 3 figures
Phys. Rev. B 66, 241302(R) (2002)
10.1103/PhysRevB.66.241302
null
cond-mat.mes-hall
null
We present a dynamical analysis of the transport through small quantum cavities with large openings. The systematic suppression of shot noise is used to distinguish direct, deterministic from indirect, indeterministic transport processes. The analysis is based on quantum mechanical calculations of $S$ matrices and their poles for quantum billiards with convex boundaries of different shape and two open channels in each of the two attached leads. Direct processes are supported when special states couple strongly to the leads, and can result in deterministic transport as signified by a striking system-specific suppression of shot noise.
[ { "version": "v1", "created": "Thu, 29 Aug 2002 11:31:38 GMT" } ]
2007-05-23T00:00:00
[ [ "Nazmitdinov", "R. G.", "" ], [ "Sim", "H. -S.", "" ], [ "Schomerus", "H.", "" ], [ "Rotter", "I.", "" ] ]
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2110.07900
Yuichi Motoyama
Yuichi Motoyama, Ryo Tamura, Kazuyoshi Yoshimi, Kei Terayama, Tsuyoshi Ueno, Koji Tsuda
Bayesian optimization package: PHYSBO
12 pages, 6 figures
Computer Physics Communications 278, 108405 (2022)
10.1016/j.cpc.2022.108405
null
physics.comp-ph cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
PHYSBO (optimization tools for PHYSics based on Bayesian Optimization) is a Python library for fast and scalable Bayesian optimization. It has been developed mainly for application in the basic sciences such as physics and materials science. Bayesian optimization is used to select an appropriate input for experiments/simulations from candidate inputs listed in advance in order to obtain better output values with the help of machine learning prediction. PHYSBO can be used to find better solutions for both single and multi-objective optimization problems. At each cycle in the Bayesian optimization, a single proposal or multiple proposals can be obtained for the next experiments/simulations. These proposals can be obtained interactively for use in experiments. PHYSBO is available at https://github.com/issp-center-dev/PHYSBO.
[ { "version": "v1", "created": "Fri, 15 Oct 2021 07:29:44 GMT" }, { "version": "v2", "created": "Wed, 25 May 2022 00:55:33 GMT" } ]
2022-05-26T00:00:00
[ [ "Motoyama", "Yuichi", "" ], [ "Tamura", "Ryo", "" ], [ "Yoshimi", "Kazuyoshi", "" ], [ "Terayama", "Kei", "" ], [ "Ueno", "Tsuyoshi", "" ], [ "Tsuda", "Koji", "" ] ]
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2502.06694
ATLAS Collaboration
ATLAS Collaboration
Search for long-lived charged particles using large specific ionisation loss and time of flight in 140 $fb^{-1}$ of $pp$ collisions at $\sqrt{s}\ = 13$ TeV with the ATLAS detector
Comments: 56 pages in total, author list starting page 39, 14 figures, 9 tables, submitted to JHEP. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HMBS-2024-68/
JHEP 07 (2025) 140
10.1007/JHEP07(2025)140
CERN-EP-2025-008
hep-ex
http://creativecommons.org/licenses/by/4.0/
This paper presents a search for massive, charged, long-lived particles with the ATLAS detector at the Large Hadron Collider using an integrated luminosity of 140 $fb^{-1}$ of proton-proton collisions at $\sqrt{s}=13$ TeV. These particles are expected to move significantly slower than the speed of light. In this paper, two signal regions provide complementary sensitivity. In one region, events are selected with at least one charged-particle track with high transverse momentum, large specific ionisation measured in the pixel detector, and time of flight to the hadronic calorimeter inconsistent with the speed of light. In the other region, events are selected with at least two tracks of opposite charge which both have a high transverse momentum and an anomalously large specific ionisation. The search is sensitive to particles with lifetimes greater than about 3 ns with masses ranging from 200 GeV to 3 TeV. The results are interpreted to set constraints on the supersymmetric pair production of long-lived R-hadrons, charginos and staus, with mass limits extending beyond those from previous searches in broad ranges of lifetime.
[ { "version": "v1", "created": "Mon, 10 Feb 2025 17:18:11 GMT" } ]
2025-07-16T00:00:00
[ [ "ATLAS Collaboration", "", "" ] ]
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2210.05512
Amin Abolghasemi
Amin Abolghasemi, Arian Askari, Suzan Verberne
On the Interpolation of Contextualized Term-based Ranking with BM25 for Query-by-Example Retrieval
Proceedings of the 2022 ACM SIGIR International Conference on the Theory of Information Retrieval
null
10.1145/3539813.3545133
null
cs.IR
http://creativecommons.org/licenses/by/4.0/
Term-based ranking with pre-trained transformer-based language models has recently gained attention as they bring the contextualization power of transformer models into the highly efficient term-based retrieval. In this work, we examine the generalizability of two of these deep contextualized term-based models in the context of query-by-example (QBE) retrieval in which a seed document acts as the query to find relevant documents. In this setting -- where queries are much longer than common keyword queries -- BERT inference at query time is problematic as it involves quadratic complexity. We investigate TILDE and TILDEv2, both of which leverage BERT tokenizer as their query encoder. With this approach, there is no need for BERT inference at query time, and also the query can be of any length. Our extensive evaluation on the four QBE tasks of SciDocs benchmark shows that in a query-by-example retrieval setting TILDE and TILDEv2 are still less effective than a cross-encoder BERT ranker. However, we observe that BM25 could show a competitive ranking quality compared to TILDE and TILDEv2 which is in contrast to the findings about the relative performance of these three models on retrieval for short queries reported in prior work. This result raises the question about the use of contextualized term-based ranking models being beneficial in QBE setting. We follow-up on our findings by studying the score interpolation between the relevance score from TILDE (TILDEv2) and BM25. We conclude that these two contextualized term-based ranking models capture different relevance signals than BM25 and combining the different term-based rankers results in statistically significant improvements in QBE retrieval. Our work sheds light on the challenges of retrieval settings different from the common evaluation benchmarks.
[ { "version": "v1", "created": "Tue, 11 Oct 2022 15:03:39 GMT" } ]
2022-10-12T00:00:00
[ [ "Abolghasemi", "Amin", "" ], [ "Askari", "Arian", "" ], [ "Verberne", "Suzan", "" ] ]
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1211.2273
Ken Henisey
Ken B. Henisey, Omer M. Blaes, and P. Chris Fragile
Variability from Nonaxisymmetric Fluctuations Interacting with Standing Shocks in Tilted Black Hole Accretion Disks
accepted in ApJ October 1, 2012
null
10.1088/0004-637X/760/1/1
null
astro-ph.HE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the spatial and temporal behavior of fluid in fully three-dimensional, general relativistic, magnetohydrodynamical simulations of both tilted and untilted black hole accretion flows. We uncover characteristically greater variability in tilted simulations at frequencies similar to those predicted by the formalism of trapped modes, but ultimately conclude that its spatial structure is inconsistent with a modal interpretation. We find instead that previously identified, transient, over-dense clumps orbiting on roughly Keplerian trajectories appear generically in our global simulations, independent of tilt. Associated with these fluctuations are acoustic spiral waves interior to the orbits of the clumps. We show that the two nonaxisymmetric standing shock structures that exist in the inner regions of these tilted flows effectively amplify the variability caused by these spiral waves to markedly higher levels than in untilted flows, which lack standing shocks. Our identification of clumps, spirals, and spiral-shock interactions in these fully general relativistic, magnetohydrodynamical simulations suggests that these features may be important dynamical elements in models which incorporate tilt as a way to explain the observed variability in black hole accretion flows.
[ { "version": "v1", "created": "Sat, 10 Nov 2012 00:50:15 GMT" }, { "version": "v2", "created": "Wed, 14 Nov 2012 21:35:13 GMT" } ]
2012-11-16T00:00:00
[ [ "Henisey", "Ken B.", "" ], [ "Blaes", "Omer M.", "" ], [ "Fragile", "P. Chris", "" ] ]
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2501.12858
L. V. Bogdanov
L. V. Bogdanov
Differential and other reductions of the self-dual conformal structure equations
14 pages
null
null
null
nlin.SI math-ph math.DG math.MP
http://creativecommons.org/licenses/by/4.0/
The dispersionless integrable system we consider here was introduced to the literature rather recently, it is connected with the general local form of self-dual conformal structure (SDCS) for the signature (2,2). In integrability framework this system possesses a rich structure of reductions, including differential reductions. We will discuss several characteristic reductions for this system, using the Lax pair, hierarchy structure and the dressing scheme. We use reductions to construct solutions for the SDCS equations. One of our goals is to present type B SDCS system and consider its relations with the SDCS system.
[ { "version": "v1", "created": "Wed, 22 Jan 2025 13:11:55 GMT" } ]
2025-01-23T00:00:00
[ [ "Bogdanov", "L. V.", "" ] ]
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2401.10619
Otacilio Bezerra Leite Neto
Otacilio B. L. Neto, Michela Mulas, Francesco Corona
A model-based framework for controlling activated sludge plants
38 pages, 31 figures
null
null
null
eess.SY cs.SY math.OC
http://creativecommons.org/licenses/by-nc-nd/4.0/
This work presents a general framework for the advanced control of a common class of activated sludge plants (ASPs). Based on a dynamic model of the process and plant sensors and actuators, we design and configure a highly customisable Output Model-Predictive Controller (Output MPC) for the flexible operation of ASPs as water resource recovery facilities. The controller consists of a i) Moving-Horizon Estimator for determining the state of the process, from plant measurements, and ii) a Model-Predictive Controller for determining the optimal actions to attain high-level operational goals. The Output MPC can be configured to satisfy the technological limits of the plant equipment, as well as operational desiderata defined by plant personnel. We consider exemplary problems and show that the framework is able to control ASPs for tasks of practical relevance, ranging from wastewater treatment subject to normative limits, to the production of an effluent with varying nitrogen content, and energy recovery.
[ { "version": "v1", "created": "Fri, 19 Jan 2024 10:52:44 GMT" } ]
2024-01-22T00:00:00
[ [ "Neto", "Otacilio B. L.", "" ], [ "Mulas", "Michela", "" ], [ "Corona", "Francesco", "" ] ]
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2305.02981
Sergej Chicherin
Sergej Chicherin, Karen Efremyan
Adversarially-Guided Portrait Matting
null
null
null
null
cs.CV
http://creativecommons.org/licenses/by-sa/4.0/
We present a method for generating alpha mattes using a limited data source. We pretrain a novel transformerbased model (StyleMatte) on portrait datasets. We utilize this model to provide image-mask pairs for the StyleGAN3-based network (StyleMatteGAN). This network is trained unsupervisedly and generates previously unseen imagemask training pairs that are fed back to StyleMatte. We demonstrate that the performance of the matte pulling network improves during this cycle and obtains top results on the human portraits and state-of-the-art metrics on animals dataset. Furthermore, StyleMatteGAN provides high-resolution, privacy-preserving portraits with alpha mattes, making it suitable for various image composition tasks. Our code is available at https://github.com/chroneus/stylematte
[ { "version": "v1", "created": "Thu, 4 May 2023 16:45:04 GMT" }, { "version": "v2", "created": "Tue, 23 May 2023 11:50:01 GMT" } ]
2023-05-24T00:00:00
[ [ "Chicherin", "Sergej", "" ], [ "Efremyan", "Karen", "" ] ]
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2409.05235
Jianyuan Ni
Raunak Sarbajna, Karima Elgarroussi, Hoang D Vo, Jianyuan Ni, Christoph F. Eick
COVID19-CBABM: A City-Based Agent Based Disease Spread Modeling Framework
null
null
null
null
cs.CG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In response to the ongoing pandemic and health emergency of COVID-19, several models have been used to understand the dynamics of virus spread. Some employ mathematical models like the compartmental SEIHRD approach and others rely on agent-based modeling (ABM). In this paper, a new city-based agent-based modeling approach called COVID19-CBABM is introduced. It considers not only the transmission mechanism simulated by the SEHIRD compartments but also models people movements and their interactions with their surroundings, particularly their interactions at different types of Points of Interest (POI), such as supermarkets. Through the development of knowledge extraction procedures for Safegraph data, our approach simulates realistic conditions based on spatial patterns and infection conditions considering locations where people spend their time in a given city. Our model was implemented in Python using the Mesa-Geo framework. COVID19-CBABM is portable and can be easily extended by adding more complicated scenarios. Therefore, it is a useful tool to assist the government and health authorities in evaluating strategic decisions and actions efficiently against this epidemic, using the unique mobility patterns of each city.
[ { "version": "v1", "created": "Sun, 8 Sep 2024 22:36:50 GMT" } ]
2024-09-10T00:00:00
[ [ "Sarbajna", "Raunak", "" ], [ "Elgarroussi", "Karima", "" ], [ "Vo", "Hoang D", "" ], [ "Ni", "Jianyuan", "" ], [ "Eick", "Christoph F.", "" ] ]
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1509.05903
Serge Tabachnikov
Serge Tabachnikov
Skewers
null
null
null
null
math.MG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The skewer of a pair of skew lines in space is their common perpendicular. To configuration theorems of plane projective geometry involving points and lines (such as Pappus or Desargues) there correspond configuration theorems in space: points and lines in the plane are replaced by lines is space, the incidence between a line and a point translates as the intersection of two lines at right angle, and the operations of connecting two points by a line or by intersecting two lines at a point translate as taking the skewer of two lines. These configuration theorems hold in elliptic, Euclidean, and hyperbolic geometries. This correspondence principle extends to plane configuration theorems involving polarity. For example, the theorem that the three altitudes of a triangle are concurrent corresponds to the Petersen-Morley theorem that the common normals of the opposite sides of a space right-angled hexagon have a common normal. We define analogs of plane circles (they are 2-parameter families of lines in space) and extend the correspondence principle to plane theorems involving circles. We also discuss the skewer versions of the Sylvester problem: given a finite collection of pairwise skew lines such that the skewer of any pair intersects at least one other line at right angle, do all the line have to share a skewer? The answer is positive in the elliptic and Euclidean geometries, but negative in the hyperbolic one.
[ { "version": "v1", "created": "Sat, 19 Sep 2015 15:28:15 GMT" } ]
2015-09-22T00:00:00
[ [ "Tabachnikov", "Serge", "" ] ]
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2504.01969
Ana Isabel Castillo Pereda
Ana I. C. Pereda
Systemic Risk and Default Cascades in Global Equity Markets: Extending the Gai-Kapadia Framework with Stochastic Simulations and Network Analysis
19 pages, 9 figures, 6 table
null
null
null
q-fin.RM
http://creativecommons.org/licenses/by/4.0/
This study pioneers the application of the Gai-Kapadia framework, originally developed for interbank contagion, to global equity markets. It offers a novel approach to assess systemic risk and default cascades. Using a 20-asset network (13 Brazilian and 7 developed market assets) from 2015 to 2025, we construct exposure-based networks from price co-movements, applying thresholds theta = 0.3 and theta = 0.5 to capture significant interconnections. Cascade dynamics are evaluated through Monte Carlo simulations (n = 1000) with shocks ranging from 10 to 50 percent, complemented by deterministic propagation analysis. Results show that high clustering among Brazilian assets (Ci approx 1.0) leads to localized contagion, with an average of 2.0 failed assets per simulation. In contrast, developed markets with lower connectivity (Ci approx 0.2 to 0.4) show resilience, with zero failures beyond Brazil in all scenarios. Network visualizations highlight structural vulnerabilities: deterministic cascades reach up to 20 assets at theta = 0.3, but only 3 to 4 at theta = 0.5. Risk measures such as VaR and CVaR at 95 percent confidence confirm higher tail risks in emerging markets. This adaptation of the Gai-Kapadia model provides a robust framework for systemic risk assessment. The findings suggest that regulators should target high-clustering nodes in emerging markets, while portfolio managers may benefit from the resilience of developed markets to enhance diversification.
[ { "version": "v1", "created": "Thu, 20 Mar 2025 15:20:20 GMT" }, { "version": "v2", "created": "Fri, 4 Apr 2025 08:32:34 GMT" } ]
2025-04-07T00:00:00
[ [ "Pereda", "Ana I. C.", "" ] ]
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2402.03982
Yusu Hong
Yusu Hong and Junhong Lin
On Convergence of Adam for Stochastic Optimization under Relaxed Assumptions
NeurIPS 2024
null
null
null
math.OC cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Adaptive Momentum Estimation (Adam) algorithm is highly effective in training various deep learning tasks. Despite this, there's limited theoretical understanding for Adam, especially when focusing on its vanilla form in non-convex smooth scenarios with potential unbounded gradients and affine variance noise. In this paper, we study vanilla Adam under these challenging conditions. We introduce a comprehensive noise model which governs affine variance noise, bounded noise and sub-Gaussian noise. We show that Adam can find a stationary point with a $\mathcal{O}(\text{poly}(\log T)/\sqrt{T})$ rate in high probability under this general noise model where $T$ denotes total number iterations, matching the lower rate of stochastic first-order algorithms up to logarithm factors. More importantly, we reveal that Adam is free of tuning step-sizes with any problem-parameters, yielding a better adaptation property than the Stochastic Gradient Descent under the same conditions. We also provide a probabilistic convergence result for Adam under a generalized smooth condition which allows unbounded smoothness parameters and has been illustrated empirically to more accurately capture the smooth property of many practical objective functions.
[ { "version": "v1", "created": "Tue, 6 Feb 2024 13:19:26 GMT" }, { "version": "v2", "created": "Sat, 22 Feb 2025 03:07:15 GMT" } ]
2025-02-25T00:00:00
[ [ "Hong", "Yusu", "" ], [ "Lin", "Junhong", "" ] ]
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2505.21857
Mijung Park
Mijung Park
Revisiting Bayesian Model Averaging in the Era of Foundation Models
null
null
null
null
cs.LG stat.ML
http://creativecommons.org/licenses/by-nc-nd/4.0/
We revisit the classical, full-fledged Bayesian model averaging (BMA) paradigm to ensemble pre-trained and/or lightly-finetuned foundation models to enhance the classification performance on image and text data. To make BMA tractable under foundation models, we introduce trainable linear classifiers that take frozen features from the pre-trained foundation models as inputs. The model posteriors over the linear classifiers tell us which linear heads and frozen features are better suited for a given dataset, resulting in a principled model ensembling method. Furthermore, we propose a computationally cheaper, optimizable model averaging scheme (OMA). In OMA, we directly optimize the model ensemble weights, just like those weights based on model posterior distributions in BMA, by reducing the amount of surprise (expected entropy of the predictions) we get from predictions of ensembled models. With the rapid development of foundation models, these approaches will enable the incorporation of future, possibly significantly better foundation models to enhance the performance of challenging classification tasks.
[ { "version": "v1", "created": "Wed, 28 May 2025 01:03:28 GMT" } ]
2025-05-29T00:00:00
[ [ "Park", "Mijung", "" ] ]
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2105.12899
Xijun Li
Xijun Li, Weilin Luo, Mingxuan Yuan, Jun Wang, Jiawen Lu, Jie Wang, Jinhu Lu and Jia Zeng
Learning to Optimize Industry-Scale Dynamic Pickup and Delivery Problems
null
null
null
null
cs.AI
http://creativecommons.org/licenses/by-nc-sa/4.0/
The Dynamic Pickup and Delivery Problem (DPDP) is aimed at dynamically scheduling vehicles among multiple sites in order to minimize the cost when delivery orders are not known a priori. Although DPDP plays an important role in modern logistics and supply chain management, state-of-the-art DPDP algorithms are still limited on their solution quality and efficiency. In practice, they fail to provide a scalable solution as the numbers of vehicles and sites become large. In this paper, we propose a data-driven approach, Spatial-Temporal Aided Double Deep Graph Network (ST-DDGN), to solve industry-scale DPDP. In our method, the delivery demands are first forecast using spatial-temporal prediction method, which guides the neural network to perceive spatial-temporal distribution of delivery demand when dispatching vehicles. Besides, the relationships of individuals such as vehicles are modelled by establishing a graph-based value function. ST-DDGN incorporates attention-based graph embedding with Double DQN (DDQN). As such, it can make the inference across vehicles more efficiently compared with traditional methods. Our method is entirely data driven and thus adaptive, i.e., the relational representation of adjacent vehicles can be learned and corrected by ST-DDGN from data periodically. We have conducted extensive experiments over real-world data to evaluate our solution. The results show that ST-DDGN reduces 11.27% number of the used vehicles and decreases 13.12% total transportation cost on average over the strong baselines, including the heuristic algorithm deployed in our UAT (User Acceptance Test) environment and a variety of vanilla DRL methods. We are due to fully deploy our solution into our online logistics system and it is estimated that millions of USD logistics cost can be saved per year.
[ { "version": "v1", "created": "Thu, 27 May 2021 01:16:00 GMT" } ]
2021-05-28T00:00:00
[ [ "Li", "Xijun", "" ], [ "Luo", "Weilin", "" ], [ "Yuan", "Mingxuan", "" ], [ "Wang", "Jun", "" ], [ "Lu", "Jiawen", "" ], [ "Wang", "Jie", "" ], [ "Lu", "Jinhu", "" ], [ "Zeng", "Jia", "" ] ]
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2109.09029
Zheng Dong
Zheng Dong, Shixiang Zhu, Yao Xie, Jorge Mateu, Francisco J. Rodr\'iguez-Cort\'es
Non-stationary spatio-temporal point process modeling for high-resolution COVID-19 data
null
null
null
null
stat.AP
http://creativecommons.org/licenses/by/4.0/
Most COVID-19 studies commonly report figures of the overall infection at a state- or county-level. This aggregation tends to miss out on fine details of virus propagation. In this paper, we analyze a high-resolution COVID-19 dataset in Cali, Colombia, that records the precise time and location of every confirmed case. We develop a non-stationary spatio-temporal point process equipped with a neural network-based kernel to capture the heterogeneous correlations among COVID-19 cases. The kernel is carefully crafted to enhance expressiveness while maintaining model interpretability. We also incorporate some exogenous influences imposed by city landmarks. Our approach outperforms the state-of-the-art in forecasting new COVID-19 cases with the capability to offer vital insights into the spatio-temporal interaction between individuals concerning the disease spread in a metropolis.
[ { "version": "v1", "created": "Sat, 18 Sep 2021 23:39:11 GMT" }, { "version": "v2", "created": "Wed, 29 Sep 2021 19:41:40 GMT" }, { "version": "v3", "created": "Thu, 9 Mar 2023 05:10:09 GMT" } ]
2023-03-10T00:00:00
[ [ "Dong", "Zheng", "" ], [ "Zhu", "Shixiang", "" ], [ "Xie", "Yao", "" ], [ "Mateu", "Jorge", "" ], [ "Rodríguez-Cortés", "Francisco J.", "" ] ]
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2407.13524
Junyoung Park
Ilhoon Yoon, Hyeongjun Kwon, Jin Kim, Junyoung Park, Hyunsung Jang, Kwanghoon Sohn
Enhancing Source-Free Domain Adaptive Object Detection with Low-confidence Pseudo Label Distillation
ECCV 2024
null
null
null
cs.CV cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Source-Free domain adaptive Object Detection (SFOD) is a promising strategy for deploying trained detectors to new, unlabeled domains without accessing source data, addressing significant concerns around data privacy and efficiency. Most SFOD methods leverage a Mean-Teacher (MT) self-training paradigm relying heavily on High-confidence Pseudo Labels (HPL). However, these HPL often overlook small instances that undergo significant appearance changes with domain shifts. Additionally, HPL ignore instances with low confidence due to the scarcity of training samples, resulting in biased adaptation toward familiar instances from the source domain. To address this limitation, we introduce the Low-confidence Pseudo Label Distillation (LPLD) loss within the Mean-Teacher based SFOD framework. This novel approach is designed to leverage the proposals from Region Proposal Network (RPN), which potentially encompasses hard-to-detect objects in unfamiliar domains. Initially, we extract HPL using a standard pseudo-labeling technique and mine a set of Low-confidence Pseudo Labels (LPL) from proposals generated by RPN, leaving those that do not overlap significantly with HPL. These LPL are further refined by leveraging class-relation information and reducing the effect of inherent noise for the LPLD loss calculation. Furthermore, we use feature distance to adaptively weight the LPLD loss to focus on LPL containing a larger foreground area. Our method outperforms previous SFOD methods on four cross-domain object detection benchmarks. Extensive experiments demonstrate that our LPLD loss leads to effective adaptation by reducing false negatives and facilitating the use of domain-invariant knowledge from the source model. Code is available at https://github.com/junia3/LPLD.
[ { "version": "v1", "created": "Thu, 18 Jul 2024 13:58:42 GMT" } ]
2024-07-19T00:00:00
[ [ "Yoon", "Ilhoon", "" ], [ "Kwon", "Hyeongjun", "" ], [ "Kim", "Jin", "" ], [ "Park", "Junyoung", "" ], [ "Jang", "Hyunsung", "" ], [ "Sohn", "Kwanghoon", "" ] ]
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1705.04934
Ran Liu
Ran Liu, Chau Yuen, Tri-Nhut Do, Ye Jiang, Xiang Liu, U-Xuan Tan
Indoor Positioning using Similarity-based Sequence and Dead Reckoning without Training
18th IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2017)
null
null
null
cs.NI
http://creativecommons.org/publicdomain/zero/1.0/
For the traditional fingerprinting-based positioning approach, it is essential to collect measurements at known locations as reference fingerprints during a training phase, which can be time-consuming and labor-intensive. This paper proposes a novel approach to track a user in an indoor environment by integrating similarity-based sequence and dead reckoning. In particular, we represent the fingerprinting map as location sequences based on distance ranking of the APs (access points) whose positions are known. The fingerprint used for online positioning is represented by a ranked sequence of APs based on the measured Received Signal Strength (RSS), which is refereed to as RSS sequence in this paper. Embedded into a particle filter, we achieve the tracking of a mobile user by fusing the sequence-based similarity and dead reckoning. Extensive experiments are conducted to evaluate the proposed approach.
[ { "version": "v1", "created": "Sun, 14 May 2017 09:02:45 GMT" } ]
2017-05-16T00:00:00
[ [ "Liu", "Ran", "" ], [ "Yuen", "Chau", "" ], [ "Do", "Tri-Nhut", "" ], [ "Jiang", "Ye", "" ], [ "Liu", "Xiang", "" ], [ "Tan", "U-Xuan", "" ] ]
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2208.07213
Hengyu Zhou
Hengyu Zhou
A blow-up method to prescribed mean curvature graphs with fixed boundaries
Abstract and Introduction are rewritten. Add a subsection in Section 5 to illustrate the Nc-f property can not be removed. Add Section 7 to give an application in the PMC Plateau problem
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math.DG math.AP
http://creativecommons.org/licenses/by/4.0/
In this paper, we apply a blow-up method of Schoen and Yau in \cite{SY81} to study a large class of prescribed mean curvature (PMC) Dirichlet problems in $n(n\geq 2)$-dimensional Riemannian manifolds. In this process we establish curvature estimates for almost minimizing PMC hypersurfaces, using an approach of Schauder estimates from Simon \cite{Sim76}. We define an Nc-f domain, where $f$ is a given function generating from the PMC equation. Combining this condition with a sufficiently mean convex assumption the blow-up method yields corresponding solutions to these PMC Dirichlet problems. Such Nc-f assumption is almost optimal by an example. An application of our result into the PMC Plateau problem is also presented.
[ { "version": "v1", "created": "Mon, 15 Aug 2022 14:18:15 GMT" }, { "version": "v2", "created": "Sun, 15 Oct 2023 02:23:58 GMT" } ]
2023-10-17T00:00:00
[ [ "Zhou", "Hengyu", "" ] ]
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1411.1744
Arnab Kundu
Elena Caceres, Arnab Kundu, Juan F. Pedraza and Di-Lun Yang
Weak Field Collapse in AdS: Introducing a Charge Density
1+48 pages, multiple figures, published in JHEP
JHEP 1506 (2015) 111
10.1007/JHEP06(2015)111
UTTG-22-14, TCC-024-14, CCTP-2014-24, CCQCN-2014-49
hep-th cond-mat.str-el gr-qc nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the effect of a non-vanishing chemical potential on the thermalization time of a strongly coupled large $N_c$ gauge theory in $(2+1)$-dimensions, using a specific bottom-up gravity model in asymptotically AdS space. We first construct a perturbative solution to the gravity-equations, which dynamically interpolates between two AdS black hole backgrounds with different temperatures and chemical potentials, in a perturbative expansion of a bulk neutral scalar field. In the dual field theory, this corresponds to a quench dynamics by a marginal operator, where the corresponding coupling serves as the small parameter in which the perturbation is carried out. The evolution of non-local observables, such as the entanglement entropy, suggests that thermalization time decreases with increasing chemical potential. We also comment on the validity of our perturbative analysis.
[ { "version": "v1", "created": "Thu, 6 Nov 2014 20:54:27 GMT" }, { "version": "v2", "created": "Mon, 29 Jun 2015 15:52:39 GMT" } ]
2018-09-25T00:00:00
[ [ "Caceres", "Elena", "" ], [ "Kundu", "Arnab", "" ], [ "Pedraza", "Juan F.", "" ], [ "Yang", "Di-Lun", "" ] ]
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2204.08144
Javad Taghizadeh Firouzjaee
Sara Azizi, Sareh Eslamzadeh, Javad T. Firouzjaee and Kourosh Nozari
Hawking Temperature for 4D-Einstein-Gauss-Bonnet Black Holes from uncertainty principle
19 pages, 15 figures
null
null
null
gr-qc hep-th
http://creativecommons.org/licenses/by/4.0/
Inspired by string theory, Heisenberg's uncertainty principle can be generalized to include the photon-electron gravitational interaction, which leads to the Generalized Uncertainty Principle (GUP). Although GUP considers gravitational uncertainty at the minimum fundamental length scale in physics, it does not consider the effects of spacetime curvature on quantum mechanical uncertainty relations. The Extended Uncertainty Principle (EUP) is a generalization of Heisenberg's Uncertainty Principle that, unlike the GUP, applies to large length scales. GEUP is also a linear combination of EUP and GUP that creates minimal uncertainty on large length scales. The Einstein-Gauss-Bonnet theory (EGB) can be considered as one of the most promising candidates for modified gravity. In this paper, by using GUP, EUP, and GEUP, we intend to obtain the Hawking temperature of a four-dimensional EGB black hole in the asymptotically flat and (Anti)-de Sitter spacetime. We show that coupling constant, cosmological constant, mass, and radius significantly affect Hawking temperature and decrease or increase Hawking temperature depending on the chosen horizons.
[ { "version": "v1", "created": "Mon, 18 Apr 2022 03:17:38 GMT" } ]
2022-04-19T00:00:00
[ [ "Azizi", "Sara", "" ], [ "Eslamzadeh", "Sareh", "" ], [ "Firouzjaee", "Javad T.", "" ], [ "Nozari", "Kourosh", "" ] ]
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2504.06941
Olivia Yao
Jiayu Chen, Jing Jin, and Olivia X.M. Yao
Proofs of two conjectures on congruences of overcubic partition triples
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null
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math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $\overline{bt}(n)$ denote the number of overcubic partition triples of $n$. Nayaka, Dharmendra and Kumar proved some congruences modulo 8, 16 and 32 for $\overline{bt}(n)$. Recently, Saikia and Sarma established some congruences modulo 64 for $\overline{bt}(n)$ by using both elementary techniques and the theory of modular forms. In their paper, they also posed two conjectures on infinite families of congruences modulo 64 and 128 for $\overline{bt}(n)$. In this paper, we confirm the two conjectures.
[ { "version": "v1", "created": "Wed, 9 Apr 2025 14:49:16 GMT" } ]
2025-04-10T00:00:00
[ [ "Chen", "Jiayu", "" ], [ "Jin", "Jing", "" ], [ "Yao", "Olivia X. M.", "" ] ]
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astro-ph/9509137
J. Shields
Joseph C. Shields, Robert C. Kennicutt (Steward Observatory)
Consequences of Dust in Metal-Rich HII Regions
21 pages (AASTeX), plus 9 figures (uuencoded, gzipped, tar), to appear in ApJ, December 1995
Astrophys.J. 454 (1995) 807
10.1086/176533
null
astro-ph
null
Dust and associated depletion of heavy elements from the gas phase can modify the thermal properties of HII regions from the dust-free case, with significant consequences for the emergent optical spectrum. We present the results of theoretical calculations illustrating the effects of grains on the spectra of giant, extragalactic HII regions, with emphasis on high metallicity systems (i.e. solar and higher Z). Dust provides a simple explanation for the observational absence of pure Balmer-line spectra that are expected on theoretical grounds for dust-free, chemically enriched nebulae. Grains may also play a role in enhancements of forbidden-line emission observed in HII regions in the enriched nuclei of normal galaxies. In most cases, depletion introduces the strongest perturbations to the optical spectrum. Selective absorption of the ionizing continuum as well as heating by grain photoelectrons are important in some instances, however, and grain heating can be particularly important for enhancing emission in high-ionization lines. Allowing for depletion, the presence of dust is unlikely to introduce large errors in global metallicity indicators, although uncertainties in depletion factors coupled with the sensitivity of infrared cooling to electron density will make accurate calibrations difficult at high Z. The present calculations establish further that previous relative abundance analyses that fail to take into account dust effects in a self-consistent way (grain heating as well as depletion) may overestimate temperature gradients in high-Z nebulae, resulting in errors in relative abundances for different elements.
[ { "version": "v1", "created": "Wed, 27 Sep 1995 00:26:51 GMT" } ]
2009-10-28T00:00:00
[ [ "Shields", "Joseph C.", "", "Steward Observatory" ], [ "Kennicutt", "Robert C.", "", "Steward Observatory" ] ]
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1106.0817
J\"urgen Potthoff
Vadim Kostrykin, J\"urgen Potthoff, Robert Schrader
Finite propagation speed for solutions of the wave equation on metric graphs
24 pages, 1 figure
null
null
null
math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We provide a class of self-adjoint Laplace operators on metric graphs with the property that the solutions of the associated wave equation satisfy the finite propagation speed property. The proof uses energy methods, which are adaptions of corresponding methods for smooth manifolds.
[ { "version": "v1", "created": "Sat, 4 Jun 2011 12:19:09 GMT" } ]
2011-06-07T00:00:00
[ [ "Kostrykin", "Vadim", "" ], [ "Potthoff", "Jürgen", "" ], [ "Schrader", "Robert", "" ] ]
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1502.01586
Brendan Crill
Planck Collaboration: R. Adam, P. A. R. Ade, N. Aghanim, M. Arnaud, M. Ashdown, J. Aumont, C. Baccigalupi, A. J. Banday, R. B. Barreiro, N. Bartolo, E. Battaner, K. Benabed, A. Benoit, A. Benoit-Levy, J.-P. Bernard, M. Bersanelli, B. Bertincourt, P. Bielewicz, J. J. Bock, L. Bonavera, J. R. Bond, J. Borrill, F. R. Bouchet, F. Boulanger, M. Bucher, C. Burigana, E. Calabrese, J.-F. Cardoso, A. Catalano, A. Challinor, A. Chamballu, R.-R. Chary, H. C. Chiang, P. R. Christensen, D. L. Clements, S. Colombi, L. P. L. Colombo, C. Combet, F. Couchot, A. Coulais, B. P. Crill, A. Curto, F. Cuttaia, L. Danese, R. D. Davies, R. J. Davis, P. de Bernardis, A. de Rosa, G. de Zotti, J. Delabrouille, J.-M. Delouis, F.-X. Desert, J. M. Diego, H. Dole, S. Donzelli, O. Dore, M. Douspis, A. Ducout, X. Dupac, G. Efstathiou, F. Elsner, T. A. Ensslin, H. K. Eriksen, E. Falgarone, J. Fergusson, F. Finelli, O. Forni, M. Frailis, A. A. Fraisse, E. Franceschi, A. Frejsel, S. Galeotta, S. Galli, K. Ganga, T. Ghosh, M. Giard, Y. Giraud-Heraud, E. Gjerlow, J. Gonzalez-Nuevo, K. M. Gorski, S. Gratton, A. Gruppuso, J. E. Gudmundsson, F. K. Hansen, D. Hanson, D. L. Harrison, S. Henrot-Versille, D. Herranz, S. R. Hildebrandt, E. Hivon, M. Hobson, W. A. Holmes, A. Hornstrup, W. Hovest, K. M. Huffenberger, G. Hurier, A. H. Jaffe, T. R. Jaffe, W. C. Jones, M. Juvela, E. Keihanen, R. Keskitalo, T. S. Kisner, R. Kneissl, J. Knoche, M. Kunz, H. Kurki-Suonio, G. Lagache, J.-M. Lamarre, A. Lasenby, M. Lattanzi, C. R. Lawrence, M. Le Jeune, J. P. Leahy, E. Lellouch, R. Leonardi, J. Lesgourgues, F. Levrier, M. Liguori, P. B. Lilje, M. Linden-Vornle, M. Lopez-Caniego, P. M. Lubin, J. F. Macias-Perez, G. Maggio, D. Maino, N. Mandolesi, A. Mangilli, M. Maris, P. G. Martin, E. Martinez-Gonzalez, S. Masi, S. Matarrese, P. McGehee, A. Melchiorri, L. Mendes, A. Mennella, M. Migliaccio, S. Mitra, M.-A. Miville-Deschenes, A. Moneti, L. Montier, R. Moreno, G. Morgante, D. Mortlock, A. Moss, S. Mottet, D. Munshi, J. A. Murphy, P. Naselsky, F. Nati, P. Natoli, C. B. Netterfield, H. U. Norgaard-Nielsen, F. Noviello, D. Novikov, I. Novikov, C. A. Oxborrow, F. Paci, L. Pagano, F. Pajot, D. Paoletti, F. Pasian, G. Patanchon, T. J. Pearson, O. Perdereau, L. Perotto, F. Perrotta, V. Pettorino, F. Piacentini, M. Piat, E. Pierpaoli, D. Pietrobon, S. Plaszczynski, E. Pointecouteau, G. Polenta, G. W. Pratt, G. Prezeau, S. Prunet, J.-L. Puget, J. P. Rachen, M. Reinecke, M. Remazeilles, C. Renault, A. Renzi, I. Ristorcelli, G. Rocha, C. Rosset, M. Rossetti, G. Roudier, M. Rowan-Robinson, B. Rusholme, M. Sandri, D. Santos, A. Sauve, M. Savelainen, G. Savini, D. Scott, M. D. Seiffert, E. P. S. Shellard, L. D. Spencer, V. Stolyarov, R. Stompor, R. Sudiwala, D. Sutton, A.-S. Suur-Uski, J.-F. Sygnet, J. A. Tauber, L. Terenzi, L. Toffolatti, M. Tomasi, M. Tristram, M. Tucci, J. Tuovinen, L. Valenziano, J. Valiviita, B. Van Tent, L. Vibert, P. Vielva, F. Villa, L. A. Wade, B. D. Wandelt, R. Watson, I. K. Wehus, D. Yvon, A. Zacchei, A. Zonca
Planck 2015 results. VII. HFI TOI and beam processing
null
A&A 594, A7 (2016)
10.1051/0004-6361/201525844
null
astro-ph.IM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Planck High Frequency Instrument (HFI) has observed the full sky at six frequencies (100, 143, 217, 353, 545, and 857 GHz) in intensity and at four frequencies in linear polarization (100, 143, 217, and 353 GHz). In order to obtain sky maps, the time-ordered information (TOI) containing the detector and pointing samples must be processed and the angular response must be assessed. The full mission TOI is included in the Planck 2015 release. This paper describes the HFI TOI and beam processing for the 2015 release. HFI calibration and map-making are described in a companion paper. The main pipeline has been modified since the last release (2013 nominal mission in intensity only), by including a correction for the non-linearity of the warm readout and by improving the model of the bolometer time response. The beam processing is an essential tool that derives the angular response used in all the Planck science papers and we report an improvement in the effective beam window function uncertainty of more than a factor 10 relative to the 2013 release. Noise correlations introduced by pipeline filtering function are assessed using dedicated simulations. Angular cross-power spectra using datasets that are decorrelated in time are immune to the main systematic effects.
[ { "version": "v1", "created": "Thu, 5 Feb 2015 15:08:30 GMT" }, { "version": "v2", "created": "Fri, 17 Jul 2015 16:52:17 GMT" } ]
2016-09-21T00:00:00
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1510.03786
Carlos Gabriel Pacheco Dr.
Carlos G. Pacheco
Green kernel for a random Schr\"odinger operator
null
null
10.1142/S0219199715500820
null
math.SP math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We find explicitly the Green kernel of a random Schr\"odinger operator with Brownian white noise. To do this, we first handle the random operator by defining it weakly using the inner product of a Hilbert space. Then, using classic Sturm-Liouville theory, we can build the Green kernel with linearly independent solutions of a homogeneous problem. As a corollary we have that the random operator has a discrete spectra.
[ { "version": "v1", "created": "Tue, 13 Oct 2015 17:21:44 GMT" } ]
2015-10-14T00:00:00
[ [ "Pacheco", "Carlos G.", "" ] ]
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1611.05567
Masaaki Furusawa
Masaaki Furusawa, Kazuki Morimoto
Refined global Gross-Prasad conjecture on special Bessel periods and Boecherer's conjecture
33 pages; revised extensively following the suggestions by the referee. Accepted for publication in J. Eur. Math. Soc. (JEMS)
J. Eur. Math. Soc. 23 (2021), no. 4, pp. 1295--1331
10.4171/JEMS/1034
null
math.NT math.RT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we pursue the refined global Gross-Prasad conjecture for Bessel periods formulated by Yifeng Liu in the case of special Bessel periods for $\mathrm{SO}\left(2n+1\right)\times\mathrm{SO}\left(2\right)$. Recall that a Bessel period for $\mathrm{SO}\left(2n+1\right)\times\mathrm{SO}\left(2\right)$ is called special when the representation of $\mathrm{SO}\left(2\right)$ is trivial. Let $\pi$ be an irreducible cuspidal tempered automorphic representation of a special orthogonal group of an odd dimensional quadratic space over a totally real number field $F$ whose local component $\pi_v$ at any archimedean place $v$ of $F$ is a discrete series representation. Let $E$ be a quadratic extension of $F$ and suppose that the special Bessel period corresponding to $E$ does not vanish identically on $\pi$. Then we prove the Ichino-Ikeda type explicit formula conjectured by Liu for the central value $L\left(1/2,\pi\right)L\left(1/2,\pi\times\chi_E\right)$, where $\chi_E$ denotes the quadratic character corresponding to $E$. Our result yields a proof of Boecherer's conecture on holomorphic Siegel cusp forms of degree two which are Hecke eigenforms.
[ { "version": "v1", "created": "Thu, 17 Nov 2016 05:25:05 GMT" }, { "version": "v2", "created": "Thu, 24 Nov 2016 04:23:47 GMT" }, { "version": "v3", "created": "Tue, 25 Jul 2017 11:55:42 GMT" }, { "version": "v4", "created": "Mon, 27 Nov 2017 11:58:54 GMT" }, { "version": "v5", "created": "Sun, 27 Jan 2019 09:18:06 GMT" } ]
2024-10-21T00:00:00
[ [ "Furusawa", "Masaaki", "" ], [ "Morimoto", "Kazuki", "" ] ]
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2507.21257
David Maria Schmidt
David Maria Schmidt, Raoul Schubert, Philipp Cimiano
CompoST: A Benchmark for Analyzing the Ability of LLMs To Compositionally Interpret Questions in a QALD Setting
Research Track, 24th International Semantic Web Conference (ISWC 2025), November 2-6, 2025, Nara, Japan
null
null
null
cs.AI cs.CL
http://creativecommons.org/licenses/by/4.0/
Language interpretation is a compositional process, in which the meaning of more complex linguistic structures is inferred from the meaning of their parts. Large language models possess remarkable language interpretation capabilities and have been successfully applied to interpret questions by mapping them to SPARQL queries. An open question is how systematic this interpretation process is. Toward this question, in this paper, we propose a benchmark for investigating to what extent the abilities of LLMs to interpret questions are actually compositional. For this, we generate three datasets of varying difficulty based on graph patterns in DBpedia, relying on Lemon lexica for verbalization. Our datasets are created in a very controlled fashion in order to test the ability of LLMs to interpret structurally complex questions, given that they have seen the atomic building blocks. This allows us to evaluate to what degree LLMs are able to interpret complex questions for which they "understand" the atomic parts. We conduct experiments with models of different sizes using both various prompt and few-shot optimization techniques as well as fine-tuning. Our results show that performance in terms of macro $F_1$ degrades from $0.45$ over $0.26$ down to $0.09$ with increasing deviation from the samples optimized on. Even when all necessary information was provided to the model in the input, the $F_1$ scores do not exceed $0.57$ for the dataset of lowest complexity. We thus conclude that LLMs struggle to systematically and compositionally interpret questions and map them into SPARQL queries.
[ { "version": "v1", "created": "Mon, 28 Jul 2025 18:20:41 GMT" } ]
2025-07-30T00:00:00
[ [ "Schmidt", "David Maria", "" ], [ "Schubert", "Raoul", "" ], [ "Cimiano", "Philipp", "" ] ]
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1901.00806
Selman Akbulut
Selman Akbulut and Eylem Zeliha Yildiz
Knot concordances in $S^1\times S^2$ and exotic smooth $4$-manifolds
12 pages, 17 figures. Remark 1 added
Journal of G\"okova Geometry Topology, vol 13 (2019)
null
null
math.GT math.SG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is known that there is a unique concordance class in the free homotopy class of $S^1\times pt \subset S^1 \times S^2$. The constructive proof of this fact is given by the second author. It turns out that all the concordances in this construction are invertible. The knots $K\subset S^{1}\times S^{2}$ with hyperbolic complements and trivial symmetry group are special interest here, because they can be used to generate absolutely exotic compact 4-manifolds by the recipe given by Akbulut and Ruberman. Here we built absolutely exotic manifold pairs by this construction, and show that this construction keeps the Stein property of the $4$-manifolds we start out with. By using this we establish the existence of an absolutely exotic contractible Stein manifold pair, and absolutely exotic homotopy $S^1\times B^3$ Stein manifold pair.
[ { "version": "v1", "created": "Thu, 3 Jan 2019 16:24:33 GMT" }, { "version": "v2", "created": "Fri, 12 Apr 2019 06:46:03 GMT" }, { "version": "v3", "created": "Tue, 24 Sep 2019 14:09:29 GMT" } ]
2020-12-29T00:00:00
[ [ "Akbulut", "Selman", "" ], [ "Yildiz", "Eylem Zeliha", "" ] ]
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hep-th/9904155
Mitsuko Abe
Mitsuko Abe and Masamichi Sato
Puzzles on the Duality between Heterotic and Type IIA Strings
Latex, 12 pages, Replacement: solution to puzzles was added, i.e., double K3 fibrations
Phys.Lett. B467 (1999) 218-224
10.1016/S0370-2693(99)01171-5
TIT/HEP-411
hep-th
null
We discuss the possibility of the extension of the duality between the webs of heterotic string and the type IIA string to Calabi-Yau 3-folds with another K3 fiber by comparing the dual polyhedron of Calabi-Yau 3-folds given by Candelas, Perevalov and Rajesh.
[ { "version": "v1", "created": "Fri, 23 Apr 1999 03:10:19 GMT" }, { "version": "v2", "created": "Tue, 27 Apr 1999 08:56:51 GMT" }, { "version": "v3", "created": "Wed, 25 Aug 1999 07:46:38 GMT" } ]
2009-10-31T00:00:00
[ [ "Abe", "Mitsuko", "" ], [ "Sato", "Masamichi", "" ] ]
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1002.4748
Neil Drummond
N. D. Drummond, P. Lopez Rios, C. J. Pickard and R. J. Needs
First-Principles Study of a Positron Immersed in an Electron Gas
null
Phys. Rev. B 82, 035107 (2010)
10.1103/PhysRevB.82.035107
null
cond-mat.mes-hall cond-mat.quant-gas
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Calculations of the relaxation energy, contact pair-correlation function, and annihilating-pair momentum density for a single positron immersed in a homogeneous electron gas are presented. We achieve an accurate description of the electron-positron correlation effects by working in the reference frame in which the positron is stationary and using a mean-field approach based on single-component density functional theory. Our positron relaxation energies and annihilation rates are similar to those from the best existing many-body calculations. Our annihilating-pair momentum densities are significantly different from previous data, and include a "tail" beyond the Fermi edge.
[ { "version": "v1", "created": "Thu, 25 Feb 2010 16:04:24 GMT" } ]
2011-01-20T00:00:00
[ [ "Drummond", "N. D.", "" ], [ "Rios", "P. Lopez", "" ], [ "Pickard", "C. J.", "" ], [ "Needs", "R. J.", "" ] ]
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1710.04014
Tomoaki Nogawa
Tomoaki Nogawa
Renormalization-group theory of the abnormal singularities at the critical-order transition in bond percolation on pointed hierarchical graphs
17 pages, 3 figures
null
10.1088/1751-8121/aae79e
null
cond-mat.stat-mech cond-mat.dis-nn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the singularity of the order parameter at the transition between a critical phase and an ordered phase of bond percolation on pointed hierarchical graphs. In pointed hierarchical graphs, the renormalization group (RG) equation explicitly depends on the bare parameter, which causes the phase transitions that correspond to the bifurcation of the RG fixed point. We derive the relation between the type of this bifurcation and the type of the singularity of the order parameter. In the case of a saddle node bifurcation, the singularity of the order parameter is power-law or essential one depending on the fundamental local structure of the graph. In the case of pitchfork and transcritical bifurcations, the singularity is essential and power-law ones, respectively. These becomes power-law and discontinuous ones, respectively, in the absence of the first-order perturbation to the largest eigenvalue of the combining matrix, which gives the growth rate of the cluster size. We also show that the first-order perturbation vanishes if the relevant RG parameter is unique and the backbone of the pointed hierarchical graph is simply connected via nesting subunits.
[ { "version": "v1", "created": "Wed, 11 Oct 2017 11:35:43 GMT" }, { "version": "v2", "created": "Tue, 9 Oct 2018 02:15:21 GMT" }, { "version": "v3", "created": "Thu, 20 Dec 2018 09:30:07 GMT" } ]
2018-12-21T00:00:00
[ [ "Nogawa", "Tomoaki", "" ] ]
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1707.00839
Fernando Adri\'an Fern\'andez Tojo
Alberto Cabada and F. Adri\'an F. Tojo
On Linear Differential Equations and Systems with Reflection
null
null
null
null
math.CA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we develop a theory of linear differential systems analogous to the classical one for ODEs, including the obtaining of fundamental matrices, the development of a variation of parameters formula and the expression of the Green's functions. We also derive interesting results in the case of differential equations with reflection and generalize the Hyperbolic Phasor Addition Formula to the case of matrices.
[ { "version": "v1", "created": "Tue, 4 Jul 2017 07:51:09 GMT" } ]
2017-07-05T00:00:00
[ [ "Cabada", "Alberto", "" ], [ "Tojo", "F. Adrián F.", "" ] ]
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hep-ph/0110116
Mario Ivan Martinez
M. I. Martinez and G. Herrera (Mexico, IPN)
Dalitz plot slope parameters for $K \to \pi\pi\pi$ decays and two particle interference
17 pages, LaTex2e, 6 figures, v2 authors' affiliation modified, to appear in Mod. Phys. Lett. A
Mod.Phys.Lett. A16 (2001) 2197-2206
10.1142/S0217732301005151
null
hep-ph
null
We study the possible distortion of phase-space in the decays $K \to \pi \pi \pi$, which may result from final state interference among the decay products. Such distortion may influence the values of slope parameters extracted from the Dalitz plot distribution of these decays. We comment on the consequences on the magnitude of violation of the $\mid \Delta I \mid = 1/2$ rule in these decays.
[ { "version": "v1", "created": "Tue, 9 Oct 2001 00:02:44 GMT" }, { "version": "v2", "created": "Thu, 11 Oct 2001 01:23:47 GMT" } ]
2009-11-07T00:00:00
[ [ "Martinez", "M. I.", "", "Mexico, IPN" ], [ "Herrera", "G.", "", "Mexico, IPN" ] ]
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2310.06744
Wangbo Yu
Wangbo Yu, Li Yuan, Yan-Pei Cao, Xiangjun Gao, Xiaoyu Li, Wenbo Hu, Long Quan, Ying Shan, Yonghong Tian
HiFi-123: Towards High-fidelity One Image to 3D Content Generation
Accepted by ECCV 2024. Project Page: https://drexubery.github.io/HiFi-123/
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cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent advances in diffusion models have enabled 3D generation from a single image. However, current methods often produce suboptimal results for novel views, with blurred textures and deviations from the reference image, limiting their practical applications. In this paper, we introduce HiFi-123, a method designed for high-fidelity and multi-view consistent 3D generation. Our contributions are twofold: First, we propose a Reference-Guided Novel View Enhancement (RGNV) technique that significantly improves the fidelity of diffusion-based zero-shot novel view synthesis methods. Second, capitalizing on the RGNV, we present a novel Reference-Guided State Distillation (RGSD) loss. When incorporated into the optimization-based image-to-3D pipeline, our method significantly improves 3D generation quality, achieving state-of-the-art performance. Comprehensive evaluations demonstrate the effectiveness of our approach over existing methods, both qualitatively and quantitatively. Video results are available on the project page.
[ { "version": "v1", "created": "Tue, 10 Oct 2023 16:14:20 GMT" }, { "version": "v2", "created": "Mon, 25 Mar 2024 11:35:55 GMT" }, { "version": "v3", "created": "Fri, 12 Jul 2024 01:55:26 GMT" } ]
2024-07-15T00:00:00
[ [ "Yu", "Wangbo", "" ], [ "Yuan", "Li", "" ], [ "Cao", "Yan-Pei", "" ], [ "Gao", "Xiangjun", "" ], [ "Li", "Xiaoyu", "" ], [ "Hu", "Wenbo", "" ], [ "Quan", "Long", "" ], [ "Shan", "Ying", "" ], [ "Tian", "Yonghong", "" ] ]
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2011.14406
Adam Schweitzer
\'Ad\'am Schweitzer
Capacity of Lorentzian polynomials and distance to binomial distributions
null
null
null
null
math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we study the capacity of Lorentzian polynomials. We give a new proof of a theorem of Br\"and\'en, Leake and Pak. Our approach is probabilistic in nature and uses a lemma about a certain distance of binomial distributions to distributions with fixed expected value.
[ { "version": "v1", "created": "Sun, 29 Nov 2020 17:57:32 GMT" }, { "version": "v2", "created": "Thu, 8 Jul 2021 15:49:08 GMT" } ]
2021-07-09T00:00:00
[ [ "Schweitzer", "Ádám", "" ] ]
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1110.6467
Daniel Charlebois
Daniel A. Charlebois, Nezar Abdennur, Mads Kaern
Gene Expression Noise Facilitates Adaptation and Drug Resistance Independently of Mutation
5 pages, 3 figures
Physical Review Letters, 107, 218101 (2011)
10.1103/PhysRevLett.107.218101
null
physics.bio-ph q-bio.PE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that the effect of stress on the reproductive fitness of noisy cell populations can be modelled as first-passage time problem, and demonstrate that even relatively short-lived fluctuations in gene expression can ensure long-term survival of a drug-resistant population. We examine how this effect contributes to the development of drug-resistant cancer cells, and demonstrate that permanent immunity can arise independently of mutations.
[ { "version": "v1", "created": "Fri, 28 Oct 2011 21:23:05 GMT" }, { "version": "v2", "created": "Wed, 16 Nov 2011 04:25:53 GMT" } ]
2015-06-03T00:00:00
[ [ "Charlebois", "Daniel A.", "" ], [ "Abdennur", "Nezar", "" ], [ "Kaern", "Mads", "" ] ]
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2505.05095
SungWoo Youn
Sungjae Bae, Junu Jeong, Younggeun Kim, SungWoo Youn, Jinsu Kim, Arjan F. van Loo, Yasunobu Nakamura, Seonjeong Oh, Taehyeon Seong, Sergey Uchaikin, Jihn E. Kim, and Yannis K. Semertzidis
Axion Dark Matter Search with Near-KSVZ Sensitivity Using the TM$_{020}$ Mode
7 pages, 4 figures
null
null
null
hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Dark matter remains one of the most profound mysteries in modern physics, with axions, a hypothetical particle proposed to resolve the strong CP problem, standing as a compelling candidate. Among various experimental strategies, cavity haloscopes currently offer the most sensitive method to detect axions, though their searches have largely been confined to axion masses below 10 $\mu$eV. However, recent theoretical developments suggest that the axion mass lies beyond this range. Higher-order cavity modes have been explored as a methodological approach to expand the search range, albeit with limited success in achieving both high sensitivity and broad tunability. In this work, we present a sensitive search for axions with masses around 21 $\mu$eV, utilizing the TM$_{020}$ mode of a cylindrical cavity, which incorporated an innovative tuning mechanism. Our results reached 1.7 times the KSVZ sensitivity over 100 MHz, representing a significant improvement in this mass range and contributing to the experimental search for axion dark matter at higher masses.
[ { "version": "v1", "created": "Thu, 8 May 2025 09:48:02 GMT" } ]
2025-05-09T00:00:00
[ [ "Bae", "Sungjae", "" ], [ "Jeong", "Junu", "" ], [ "Kim", "Younggeun", "" ], [ "Youn", "SungWoo", "" ], [ "Kim", "Jinsu", "" ], [ "van Loo", "Arjan F.", "" ], [ "Nakamura", "Yasunobu", "" ], [ "Oh", "Seonjeong", "" ], [ "Seong", "Taehyeon", "" ], [ "Uchaikin", "Sergey", "" ], [ "Kim", "Jihn E.", "" ], [ "Semertzidis", "Yannis K.", "" ] ]
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1206.3300
Andrew Ringsmuth
A. K. Ringsmuth, G. J. Milburn, T. M. Stace
Multiscale photosynthetic exciton transfer
9 pages, 6 figures. A significantly updated version is now published online by Nature Physics (2012)
Nature Physics 8, 562-567 (2012)
10.1038/nphys2332
null
physics.bio-ph cond-mat.mtrl-sci cond-mat.soft quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Photosynthetic light harvesting provides a natural blueprint for bioengineered and biomimetic solar energy and light detection technologies. Recent evidence suggests some individual light harvesting protein complexes (LHCs) and LHC subunits efficiently transfer excitons towards chemical reaction centers (RCs) via an interplay between excitonic quantum coherence, resonant protein vibrations, and thermal decoherence. The role of coherence in vivo is unclear however, where excitons are transferred through multi-LHC/RC aggregates over distances typically large compared with intra-LHC scales. Here we assess the possibility of long-range coherent transfer in a simple chromophore network with disordered site and transfer coupling energies. Through renormalization we find that, surprisingly, decoherence is diminished at larger scales, and long-range coherence is facilitated by chromophoric clustering. Conversely, static disorder in the site energies grows with length scale, forcing localization. Our results suggest sustained coherent exciton transfer may be possible over distances large compared with nearest-neighbour (n-n) chromophore separations, at physiological temperatures, in a clustered network with small static disorder. This may support findings suggesting long-range coherence in algal chloroplasts, and provides a framework for engineering large chromophore or quantum dot high-temperature exciton transfer networks.
[ { "version": "v1", "created": "Thu, 14 Jun 2012 06:08:14 GMT" } ]
2012-07-10T00:00:00
[ [ "Ringsmuth", "A. K.", "" ], [ "Milburn", "G. J.", "" ], [ "Stace", "T. M.", "" ] ]
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2009.00771
Xuerui Zhang
Zhang Xuerui, Yuan Xia
LSMVOS: Long-Short-Term Similarity Matching for Video Object
null
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Objective Semi-supervised video object segmentation refers to segmenting the object in subsequent frames given the object label in the first frame. Existing algorithms are mostly based on the objectives of matching and propagation strategies, which often make use of the previous frame with masking or optical flow. This paper explores a new propagation method, uses short-term matching modules to extract the information of the previous frame and apply it in propagation, and proposes the network of Long-Short-Term similarity matching for video object segmentation (LSMOVS) Method: By conducting pixel-level matching and correlation between long-term matching module and short-term matching module with the first frame and previous frame, global similarity map and local similarity map are obtained, as well as feature pattern of current frame and masking of previous frame. After two refine networks, final results are obtained through segmentation network. Results: According to the experiments on the two data sets DAVIS 2016 and 2017, the method of this paper achieves favorable average of region similarity and contour accuracy without online fine tuning, which achieves 86.5% and 77.4% in terms of single target and multiple targets. Besides, the count of segmented frames per second reached 21. Conclusion: The short-term matching module proposed in this paper is more conducive to extracting the information of the previous frame than only the mask. By combining the long-term matching module with the short-term matching module, the whole network can achieve efficient video object segmentation without online fine tuning
[ { "version": "v1", "created": "Wed, 2 Sep 2020 01:32:05 GMT" } ]
2020-09-03T00:00:00
[ [ "Xuerui", "Zhang", "" ], [ "Xia", "Yuan", "" ] ]
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0912.4782
Wei-Xing Zhou
Wei-Xing Zhou (ECUST)
Finite-size effect and the components of multifractality in financial volatility
9 RevTex pages including 9 eps figures. Comments and suggestions are warmly welcome
Chaos, Solitons & Fractals 45 (2), 147-155 (2012)
10.1016/j.chaos.2011.11.004
null
q-fin.ST
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Many financial variables are found to exhibit multifractal nature, which is usually attributed to the influence of temporal correlations and fat-tailedness in the probability distribution (PDF). Based on the partition function approach of multifractal analysis, we show that there is a marked finite-size effect in the detection of multifractality, and the effective multifractality is the apparent multifractality after removing the finite-size effect. We find that the effective multifractality can be further decomposed into two components, the PDF component and the nonlinearity component. Referring to the normal distribution, we can determine the PDF component by comparing the effective multifractality of the original time series and the surrogate data that have a normal distribution and keep the same linear and nonlinear correlations as the original data. We demonstrate our method by taking the daily volatility data of Dow Jones Industrial Average from 26 May 1896 to 27 April 2007 as an example. Extensive numerical experiments show that a time series exhibits effective multifractality only if it possesses nonlinearity and the PDF has impact on the effective multifractality only when the time series possesses nonlinearity. Our method can also be applied to judge the presence of multifractality and determine its components of multifractal time series in other complex systems.
[ { "version": "v1", "created": "Thu, 24 Dec 2009 04:00:36 GMT" } ]
2012-01-13T00:00:00
[ [ "Zhou", "Wei-Xing", "", "ECUST" ] ]
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0805.4065
Tomio Umeda
Tomio Umeda (University of Hyogo)
Eigenfunctions of Dirac operators at the threshold energies
9 pages
null
null
Seminar Notes of Mathematical Sciences 11 (2008), Ibaraki University
math.SP math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that the eigenspaces of the Dirac operator $H=\alpha\cdot (D - A(x)) + m \beta $ at the threshold energies $\pm m$ are coincide with the direct sum of the zero space and the kernel of the Weyl-Dirac operator $\sigma\cdot (D - A(x))$. Based on this result, we describe the asymptotic limits of the eigenfunctions of the Dirac operator corresponding to these threshold energies. Also, we discuss the set of vector potentials for which the kernels of $H\mp m$ are non-trivial, i.e. ${Ker}(H\mp m) \not = \{0 \}$.
[ { "version": "v1", "created": "Tue, 27 May 2008 08:06:01 GMT" } ]
2008-05-28T00:00:00
[ [ "Umeda", "Tomio", "", "University of Hyogo" ] ]
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2302.05076
Yuanzhi Zhou
Hong Wang, Yuanzhi Zhou, Chi Zhang, Chen Peng, Mingxia Huang, Yi Liu, Lintao Zhang
XFL: A High Performace, Lightweighted Federated Learning Framework
null
null
null
null
cs.LG
http://creativecommons.org/licenses/by/4.0/
This paper introduces XFL, an industrial-grade federated learning project. XFL supports training AI models collaboratively on multiple devices, while utilizes homomorphic encryption, differential privacy, secure multi-party computation and other security technologies ensuring no leakage of data. XFL provides an abundant algorithms library, integrating a large number of pre-built, secure and outstanding federated learning algorithms, covering both the horizontally and vertically federated learning scenarios. Numerical experiments have shown the prominent performace of these algorithms. XFL builds a concise configuration interfaces with presettings for all federation algorithms, and supports the rapid deployment via docker containers.Therefore, we believe XFL is the most user-friendly and easy-to-develop federated learning framework. XFL is open-sourced, and both the code and documents are available at https://github.com/paritybit-ai/XFL.
[ { "version": "v1", "created": "Fri, 10 Feb 2023 06:25:00 GMT" } ]
2023-02-13T00:00:00
[ [ "Wang", "Hong", "" ], [ "Zhou", "Yuanzhi", "" ], [ "Zhang", "Chi", "" ], [ "Peng", "Chen", "" ], [ "Huang", "Mingxia", "" ], [ "Liu", "Yi", "" ], [ "Zhang", "Lintao", "" ] ]
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1005.0038
Kouji Yano
Takao Hirayama and Kouji Yano
Strong solutions of Tsirelson's equation in discrete time taking values in compact spaces with semigroup action
null
null
null
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Under the assumption that the infinite product of evolution process converges almost surely, the set of strong solutions are characterized by a compact space, which may be regarded as the set of possible initial states.
[ { "version": "v1", "created": "Sat, 1 May 2010 01:48:20 GMT" }, { "version": "v2", "created": "Wed, 16 May 2012 16:58:09 GMT" } ]
2015-03-17T00:00:00
[ [ "Hirayama", "Takao", "" ], [ "Yano", "Kouji", "" ] ]
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2106.09125
Danylo Malyuta
Danylo Malyuta, Taylor P. Reynolds, Michael Szmuk, Thomas Lew, Riccardo Bonalli, Marco Pavone, Behcet Acikmese
Convex Optimization for Trajectory Generation
68 pages, 42 figures, 5 tables. This work has been submitted to the IEEE for possible publication
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null
null
math.OC cs.RO cs.SY eess.SY
http://creativecommons.org/licenses/by/4.0/
Reliable and efficient trajectory generation methods are a fundamental need for autonomous dynamical systems of tomorrow. The goal of this article is to provide a comprehensive tutorial of three major convex optimization-based trajectory generation methods: lossless convexification (LCvx), and two sequential convex programming algorithms known as SCvx and GuSTO. In this article, trajectory generation is the computation of a dynamically feasible state and control signal that satisfies a set of constraints while optimizing key mission objectives. The trajectory generation problem is almost always nonconvex, which typically means that it is not readily amenable to efficient and reliable solution onboard an autonomous vehicle. The three algorithms that we discuss use problem reformulation and a systematic algorithmic strategy to nonetheless solve nonconvex trajectory generation tasks through the use of a convex optimizer. The theoretical guarantees and computational speed offered by convex optimization have made the algorithms popular in both research and industry circles. To date, the list of applications includes rocket landing, spacecraft hypersonic reentry, spacecraft rendezvous and docking, aerial motion planning for fixed-wing and quadrotor vehicles, robot motion planning, and more. Among these applications are high-profile rocket flights conducted by organizations like NASA, Masten Space Systems, SpaceX, and Blue Origin. This article aims to give the reader the tools and understanding necessary to work with each algorithm, and to know what each method can and cannot do. A publicly available source code repository supports the provided numerical examples. By the end of the article, the reader should be ready to use the methods, to extend them, and to contribute to their many exciting modern applications.
[ { "version": "v1", "created": "Wed, 16 Jun 2021 20:55:18 GMT" } ]
2021-06-18T00:00:00
[ [ "Malyuta", "Danylo", "" ], [ "Reynolds", "Taylor P.", "" ], [ "Szmuk", "Michael", "" ], [ "Lew", "Thomas", "" ], [ "Bonalli", "Riccardo", "" ], [ "Pavone", "Marco", "" ], [ "Acikmese", "Behcet", "" ] ]
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1102.2445
Michael Dietz
Michael Dietz and Shashi Shekhar and Yuliy Pisetsky and Anhei Shu and Dan S. Wallach
Quire: Lightweight Provenance for Smart Phone Operating Systems
null
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Smartphone apps often run with full privileges to access the network and sensitive local resources, making it difficult for remote systems to have any trust in the provenance of network connections they receive. Even within the phone, different apps with different privileges can communicate with one another, allowing one app to trick another into improperly exercising its privileges (a Confused Deputy attack). In Quire, we engineered two new security mechanisms into Android to address these issues. First, we track the call chain of IPCs, allowing an app the choice of operating with the diminished privileges of its callers or to act explicitly on its own behalf. Second, a lightweight signature scheme allows any app to create a signed statement that can be verified anywhere inside the phone. Both of these mechanisms are reflected in network RPCs, allowing remote systems visibility into the state of the phone when an RPC is made. We demonstrate the usefulness of Quire with two example applications. We built an advertising service, running distinctly from the app which wants to display ads, which can validate clicks passed to it from its host. We also built a payment service, allowing an app to issue a request which the payment service validates with the user. An app cannot not forge a payment request by directly connecting to the remote server, nor can the local payment service tamper with the request.
[ { "version": "v1", "created": "Fri, 11 Feb 2011 21:24:57 GMT" } ]
2011-02-15T00:00:00
[ [ "Dietz", "Michael", "" ], [ "Shekhar", "Shashi", "" ], [ "Pisetsky", "Yuliy", "" ], [ "Shu", "Anhei", "" ], [ "Wallach", "Dan S.", "" ] ]
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2002.00326
Michael Betancourt
Michael Betancourt and Charles C. Margossian and Vianey Leos-Barajas
The Discrete Adjoint Method: Efficient Derivatives for Functions of Discrete Sequences
16 pages, 1 figure
null
null
null
stat.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Gradient-based techniques are becoming increasingly critical in quantitative fields, notably in statistics and computer science. The utility of these techniques, however, ultimately depends on how efficiently we can evaluate the derivatives of the complex mathematical functions that arise in applications. In this paper we introduce a discrete adjoint method that efficiently evaluates derivatives for functions of discrete sequences.
[ { "version": "v1", "created": "Sun, 2 Feb 2020 05:02:27 GMT" } ]
2020-02-04T00:00:00
[ [ "Betancourt", "Michael", "" ], [ "Margossian", "Charles C.", "" ], [ "Leos-Barajas", "Vianey", "" ] ]
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1207.2724
Robert Bussmann
R. S. Bussmann, M. A. Gurwell, Hai Fu, D. J. B. Smith, S. Dye, R. Auld, M. Baes, A. J. Baker, D. Bonfield, A. Cava, D. L. Clements, A. Cooray, K. Coppin, H. Dannerbauer, A. Dariush, G. De Zotti, L. Dunne, S. Eales, J. Fritz, R. Hopwood, E. Ibar, R. J. Ivison, M. J. Jarvis, S. Kim, L. L. Leeuw, S. Maddox, M. J. Michalowski, M. Negrello, E. Pascale, M. Pohlen, D. A. Riechers, E. Rigby, Douglas Scott, P. Temi, P. P. Van der Werf, A. Verma, J. Wardlow, D. Wilner
A Detailed Gravitational Lens Model Based on Submillimeter Array and Keck Adaptive Optics Imaging of a Herschel-ATLAS Sub-millimeter Galaxy at z=4.243
Accepted to the ApJ. 12 pages, 6 figures, 3 tables
null
10.1088/0004-637X/756/2/134
null
astro-ph.CO astro-ph.GA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present high-spatial resolution imaging obtained with the Submillimeter Array (SMA) at 880um and the Keck Adaptive Optics (AO) system at Ks-band of a gravitationally lensed sub-millimeter galaxy (SMG) at z=4.243 discovered in the Herschel-Astrophysical Terahertz Large Area Survey. The SMA data (angular resolution ~0.6") resolve the dust emission into multiple lensed images, while the Keck AO Ks-band data (angular resolution ~0.1") resolve the lens into a pair of galaxies separated by 0.3". We present an optical spectrum of the foreground lens obtained with the Gemini-South telescope that provides a lens redshift of z_lens = 0.595 +/- 0.005. We develop and apply a new lens modeling technique in the visibility plane that shows that the SMG is magnified by a factor of mu = 4.1 +/- 0.2 and has an intrinsic infrared (IR) luminosity of L_IR = (2.1 +/- 0.2) x 10^13 Lsun. We measure a half-light radius of the background source of r_s = 4.4 +/- 0.5 kpc which implies an IR luminosity surface density of Sigma_IR = (3.4 +/- 0.9) x 10^11 Lsun kpc^-2, a value that is typical of z > 2 SMGs but significantly lower than IR luminous galaxies at z~0. The two lens galaxies are compact (r_lens ~ 0.9 kpc) early-types with Einstein radii of theta_E1 = 0.57 +/- 0.01 and theta_E2 = 0.40 +/- 0.01 that imply masses of M_lens1 = (7.4 +/- 0.5) x 10^10 Msun and M_lens2 = (3.7 +/- 0.3) x 10^10 Msun. The two lensing galaxies are likely about to undergo a dissipationless merger, and the mass and size of the resultant system should be similar to other early-type galaxies at z~0.6. This work highlights the importance of high spatial resolution imaging in developing models of strongly lensed galaxies discovered by Herschel.
[ { "version": "v1", "created": "Wed, 11 Jul 2012 17:55:55 GMT" } ]
2015-06-05T00:00:00
[ [ "Bussmann", "R. S.", "" ], [ "Gurwell", "M. A.", "" ], [ "Fu", "Hai", "" ], [ "Smith", "D. J. B.", "" ], [ "Dye", "S.", "" ], [ "Auld", "R.", "" ], [ "Baes", "M.", "" ], [ "Baker", "A. J.", "" ], [ "Bonfield", "D.", "" ], [ "Cava", "A.", "" ], [ "Clements", "D. L.", "" ], [ "Cooray", "A.", "" ], [ "Coppin", "K.", "" ], [ "Dannerbauer", "H.", "" ], [ "Dariush", "A.", "" ], [ "De Zotti", "G.", "" ], [ "Dunne", "L.", "" ], [ "Eales", "S.", "" ], [ "Fritz", "J.", "" ], [ "Hopwood", "R.", "" ], [ "Ibar", "E.", "" ], [ "Ivison", "R. J.", "" ], [ "Jarvis", "M. J.", "" ], [ "Kim", "S.", "" ], [ "Leeuw", "L. L.", "" ], [ "Maddox", "S.", "" ], [ "Michalowski", "M. J.", "" ], [ "Negrello", "M.", "" ], [ "Pascale", "E.", "" ], [ "Pohlen", "M.", "" ], [ "Riechers", "D. A.", "" ], [ "Rigby", "E.", "" ], [ "Scott", "Douglas", "" ], [ "Temi", "P.", "" ], [ "Van der Werf", "P. P.", "" ], [ "Verma", "A.", "" ], [ "Wardlow", "J.", "" ], [ "Wilner", "D.", "" ] ]
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1005.4610
Craig Roberts
Stanley J. Brodsky, Craig D. Roberts, Robert Shrock and Peter C. Tandy
Essence of the vacuum quark condensate
5 pages, 1 figure
Phys.Rev.C82:022201,2010
10.1103/PhysRevC.82.022201
SLAC-PUB-14107, CP3-Origins-2010-18
nucl-th astro-ph.CO hep-lat hep-ph hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that the chiral-limit vacuum quark condensate is qualitatively equivalent to the pseudoscalar meson leptonic decay constant in the sense that they are both obtained as the chiral-limit value of well-defined gauge-invariant hadron-to-vacuum transition amplitudes that possess a spectral representation in terms of the current-quark mass. Thus, whereas it might sometimes be convenient to imagine otherwise, neither is essentially a constant mass-scale that fills all spacetime. This means, in particular, that the quark condensate can be understood as a property of hadrons themselves, which is expressed, for example, in their Bethe-Salpeter or light-front wavefunctions.
[ { "version": "v1", "created": "Tue, 25 May 2010 15:48:21 GMT" } ]
2011-08-23T00:00:00
[ [ "Brodsky", "Stanley J.", "" ], [ "Roberts", "Craig D.", "" ], [ "Shrock", "Robert", "" ], [ "Tandy", "Peter C.", "" ] ]
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2502.04044
Reggie Pantig
Hira Waseem, Nikko John Leo S. Lobos, Ali \"Ovg\"un, Reggie C. Pantig
Analyzing Deflection Angles and Photon Sphere Dynamics of Magnetically Charged Black Holes in Nonlinear Electrodynamic
13 pages, 6 figures. This is the published version
Eur. Phys. J. C (2025) 85:629
10.1140/epjc/s10052-025-14373-w
null
gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we investigate the gravitational lensing properties of magnetically charged black holes within the framework of nonlinear electrodynamics. We derive the deflection angle and examine the influence of the nonlinear electrodynamics parameter $\xi$ on light bending. We initially employ a geometric approach based on the Gauss-Bonnet theorem to analyze the gravitational deflection of null and timelike particles. This method encapsulates the global characteristics of the lensing effect in an elegant manner. In the subsequent part of the work, we explore the impact of nonlinear electromagnetic corrections on the black hole shadow. Using numerical techniques, we study the behavior of the photon sphere and demonstrate that a reduction in the photon sphere radius leads to a correspondingly smaller shadow. We compare these results with those for the Schwarzschild and Reissner-Nordstr\"om black holes, highlighting the distinctive features introduced by nonlinear electrodynamics. Furthermore, we examine the strong deflection limit for light trajectories near these black holes, focusing on the roles of both the magnetic charge $Q$ and the nonlinear parameter $\xi$. Our analysis reveals that the combined effects of $Q$ and $\xi$ enhance the strong deflection angle, resulting in a more pronounced lensing effect than that predicted by the classical Reissner-Nordstr\"om solution. These findings suggest that the nonlinear interactions may provide a potential observational signature for identifying NED black holes.
[ { "version": "v1", "created": "Thu, 06 Feb 2025 13:04:15 GMT" }, { "version": "v2", "created": "Fri, 20 Jun 2025 14:27:02 GMT" } ]
2025-06-23T00:00:00
[ [ "Waseem", "Hira", "" ], [ "Lobos", "Nikko John Leo S.", "" ], [ "Övgün", "Ali", "" ], [ "Pantig", "Reggie C.", "" ] ]
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1208.5984
S\'ebastien Tremblay
Kira V. Khmelnytskaya, Vladislav V. Kravchenko, Sergii M. Torba and S\'ebastien Tremblay
Wave polynomials, transmutations and Cauchy's problem for the Klein-Gordon equation
31 pages, 8 figures (16 graphs)
J. Math. Anal. Appl. 399 (2013) 191-212
10.1016/j.jmaa.2012.10.013
null
math.AP math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove a completeness result for a class of polynomial solutions of the wave equation called wave polynomials and construct generalized wave polynomials, solutions of the Klein-Gordon equation with a variable coefficient. Using the transmutation (transformation) operators and their recently discovered mapping properties we prove the completeness of the generalized wave polynomials and use them for an explicit construction of the solution of the Cauchy problem for the Klein-Gordon equation. Based on this result we develop a numerical method for solving the Cauchy problem and test its performance.
[ { "version": "v1", "created": "Wed, 29 Aug 2012 18:40:49 GMT" } ]
2012-11-12T00:00:00
[ [ "Khmelnytskaya", "Kira V.", "" ], [ "Kravchenko", "Vladislav V.", "" ], [ "Torba", "Sergii M.", "" ], [ "Tremblay", "Sébastien", "" ] ]
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1106.5986
Elisha Falbel
Juliette Genzmer
Trace Fields of Subgroups of SU(n,1))
null
null
null
null
math.RT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this note, we study the field generated by the traces of subgroups of SU(n,1). Under some hypotheses, the trace field of a group $\Gamma \subset$ SU(2,1) is equal to the field generated by the coefficients of the matrices in $\Gamma$. If the group is the image of a representation of the fundamental group of a triangulated 3-manifold, we can relate the trace field to a geometric invariant. For an arithmetic group of the first type in SU(n,1), up to conjugacy, the trace field and the field of the coefficients are the same.
[ { "version": "v1", "created": "Wed, 29 Jun 2011 16:11:28 GMT" } ]
2011-06-30T00:00:00
[ [ "Genzmer", "Juliette", "" ] ]
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2508.02799
Rahul C. Shah
Jessica Sanson, Rahul C. Shah, Maximilian Pinaroc, Valerio Frascolla
Extracting Range-Doppler Information of Moving Targets from Wi-Fi Channel State Information
null
null
null
null
eess.SP cs.AI
http://creativecommons.org/licenses/by/4.0/
This paper presents, for the first time, a method to extract both range and Doppler information from commercial Wi-Fi Channel State Information (CSI) using a monostatic (single transceiver) setup. Utilizing the CSI phase in Wi-Fi sensing from a Network Interface Card (NIC) not designed for full-duplex operation is challenging due to (1) Hardware asynchronization, which introduces significant phase errors, and (2) Proximity of transmit (Tx) and receive (Rx) antennas, which creates strong coupling that overwhelms the motion signal of interest. We propose a new signal processing approach that addresses both challenges via three key innovations: Time offset cancellation, Phase alignment correction, and Tx/Rx coupling mitigation. Our method achieves cm-level accuracy in range and Doppler estimation for moving targets, validated using a commercial Intel Wi-Fi AX211 NIC. Our results show successful detection and tracking of moving objects in realistic environments, establishing the feasibility of high-precision sensing using standard Wi-Fi packet communications and off-the-shelf hardware without requiring any modification or specialized full-duplex capabilities.
[ { "version": "v1", "created": "Mon, 04 Aug 2025 18:10:18 GMT" } ]
2025-08-06T00:00:00
[ [ "Sanson", "Jessica", "" ], [ "Shah", "Rahul C.", "" ], [ "Pinaroc", "Maximilian", "" ], [ "Frascolla", "Valerio", "" ] ]
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2006.07419
Amer AlGhadhban Dr.
Amer AlGhadhban
F4Tele: FSO for Data Center Network Management and Packet Telemetry
null
null
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The proliferation of bandwidth-hungry applications and services forces datacenter (DC) administrators to optimize the utilization of available resources. Precisely, the network share of management traffic has grown significantly because DC networks are becoming more sophisticated and require a massive amount of data for efficient debugging and troubleshooting. Accordingly, we use free space optics communication (FSO) with wavelength division multiplexing (WDM) technology to build a flexible yet high-performance logical network responsible for management traffic. The FSO-WDM can provide reconfigurable multi-terabit topology over line-of-sight (LoS) links. Due to space and processing capacity reasons, we can not offer direct connections from every data rack to the network management racks. Alternatively, the data racks are grouped together as each group is serviced for a duration of time matches its average arrival-rate. Since the data racks showed different arrival-rates, the hotspot racks are allocated with longer service time. The evaluation results show that F4Tele carried out high throughput close to the expensive solution (benchmark).
[ { "version": "v1", "created": "Fri, 12 Jun 2020 18:48:50 GMT" } ]
2020-06-16T00:00:00
[ [ "AlGhadhban", "Amer", "" ] ]
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2403.15693
Shuo Wang
Lanxin Xu, Shuo Wang
Technical Report: Masked Skeleton Sequence Modeling for Learning Larval Zebrafish Behavior Latent Embeddings
null
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this report, we introduce a novel self-supervised learning method for extracting latent embeddings from behaviors of larval zebrafish. Drawing inspiration from Masked Modeling techniquesutilized in image processing with Masked Autoencoders (MAE) \cite{he2022masked} and in natural language processing with Generative Pre-trained Transformer (GPT) \cite{radford2018improving}, we treat behavior sequences as a blend of images and language. For the skeletal sequences of swimming zebrafish, we propose a pioneering Transformer-CNN architecture, the Sequence Spatial-Temporal Transformer (SSTFormer), designed to capture the inter-frame correlation of different joints. This correlation is particularly valuable, as it reflects the coordinated movement of various parts of the fish body across adjacent frames. To handle the high frame rate, we segment the skeleton sequence into distinct time slices, analogous to "words" in a sentence, and employ self-attention transformer layers to encode the consecutive frames within each slice, capturing the spatial correlation among different joints. Furthermore, we incorporate a CNN-based attention module to enhance the representations outputted by the transformer layers. Lastly, we introduce a temporal feature aggregation operation between time slices to improve the discrimination of similar behaviors.
[ { "version": "v1", "created": "Sat, 23 Mar 2024 02:58:10 GMT" } ]
2024-03-26T00:00:00
[ [ "Xu", "Lanxin", "" ], [ "Wang", "Shuo", "" ] ]
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2201.13069
Zhenqian Li
Zhenqian Li
On a question of Koll\'{a}r
Comments are welcome!
null
null
null
math.CV
http://creativecommons.org/licenses/by-nc-sa/4.0/
In this note, we establish a generalized analytic inversion of adjunction via the Nadel-Ohsawa multiplier/adjoint ideal sheaves associated to plurisubharmonic (psh) functions for log pairs, by which we answer a question of Koll\'{a}r in full generality.
[ { "version": "v1", "created": "Mon, 31 Jan 2022 09:01:55 GMT" } ]
2022-02-01T00:00:00
[ [ "Li", "Zhenqian", "" ] ]
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2006.11504
Zhigang Wu
Zhigang Wu, Shizhong Zhang and Hui Zhai
Dynamical Kosterlitz-Thouless Theory for Two-Dimensional Ultracold Atomic Gases
11 pages, 4 figures
Phys. Rev. A 102, 043311 (2020)
10.1103/PhysRevA.102.043311
null
cond-mat.quant-gas
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this letter we develop a theory for the first and second sound in a two-dimensional atomic superfluid across the superfluid transition based on the dynamic Koterlitz-Thouless theory. We employ a set of modified two-fluid hydrodynamic equations which incorporate the dynamics of the quantised vortices, rather than the conventional ones for a three-dimensional superfluid. As far as the sound dispersion equation is concerned, the modification is essentially equivalent to replacing the static superfluid density with a frequency dependent one, renormalised by the frequency dependent "dielectric constant" of the vortices. This theory has two direct consequences. First, because the renormalised superfluid density at finite frequencies does not display discontinuity across the superfluid transition, in contrast to the static superfluid density, the sound velocities vary smoothly across the transition. Second, the theory includes dissipation due to free vortices, and thus naturally describes the sound-to-diffusion crossover for the second sound in the normal phase. With only one fitting parameter, our theory gives a perfect agreement with the experimental measurements of sound velocities across the transition, as well as the quality factor in the vicinity of the transition. The predictions from this theory can be further verified by future experiments.
[ { "version": "v1", "created": "Sat, 20 Jun 2020 06:55:19 GMT" } ]
2020-10-14T00:00:00
[ [ "Wu", "Zhigang", "" ], [ "Zhang", "Shizhong", "" ], [ "Zhai", "Hui", "" ] ]
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2308.02271
Chao Zheng
Xu Xu, Chao Zheng
Combinatorial curvature flows with surgery for inversive distance circle packings on surfaces
null
null
null
null
math.DG
http://creativecommons.org/licenses/by/4.0/
Inversive distance circle packings introduced by Bowers-Stephenson are natural generalizations of Thurston's circle packings on surfaces. To find piecewise Euclidean metrics on surfaces with prescribed combinatorial curvatures, we introduce the combinatorial Calabi flow, the fractional combinatorial Calabi flow and the combinatorial $p$-th Calabi flow for the Euclidean inversive distance circle packings. Due to the singularities possibly developed by these combinatorial curvature flows, the longtime existence and convergence of these combinatorial curvature flows have been a difficult problem for a long time. To handle the potential singularities along these combinatorial curvature flows, we do surgery along these flows by edge flipping under the weighted Delaunay condition. Using the discrete conformal theory recently established by Bobenko-Lutz for decorated piecewise Euclidean metrics on surfaces, we prove the longtime existence and global convergence for the solutions of these combinatorial curvature flows with surgery. This provides effective algorithms for finding piecewise Euclidean metrics on surfaces with prescribed combinatorial curvatures.
[ { "version": "v1", "created": "Fri, 4 Aug 2023 11:53:48 GMT" } ]
2023-08-07T00:00:00
[ [ "Xu", "Xu", "" ], [ "Zheng", "Chao", "" ] ]
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2205.04305
Alexey Lubashevskiy Dr.
I. Alekseev, K. Balej, V. Belov, S. Evseev, D. Filosofov, M. Fomina, Z. Hons, D. Karaivanov, S. Kazartsev, J. Khushvaktov, A. Kuznetsov, A. Lubashevskiy, D. Medvedev, D. Ponomarev, A. Rakhimov, K. Shakhov, E. Shevchik, M. Shirchenko, K. Smolek, S. Rozov, I. Rozova, S. Vasilyev, E. Yakushev, and I. Zhitnikov (the nuGeN Collaboration)
First results of the nuGeN experiment on coherent elastic neutrino-nucleus scattering
null
Phys. Rev. D 106, L051101, (2022)
10.1103/PhysRevD.106.L051101
null
nucl-ex hep-ex
http://creativecommons.org/licenses/by/4.0/
The nuGeN experiment is aimed to investigate neutrino properties using antineutrinos from the reactor of the Kalinin Nuclear Power Plant. The experimental setup is located at about 11 meters from the center of the 3.1 GWth reactor core. Scattering of the antineutrinos from the reactor is detected with low energy threshold high purity germanium detector. Passive and active shieldings are used to suppress all kinds of backgrounds coming from surrounding materials and cosmic radiation. The description of the experimental setup together with the first results is presented. The data taken in regimes with reactor ON (94.50 days) and reactor OFF (47.09 days) have been compared. No significant difference between spectra of two data sets is observed, i.e. no positive signals for coherent elastic neutrino-nucleus scattering are detected. Under Standard Model assumptions about coherent neutrino scattering an upper limit on a quenching parameter k < 0.26 (90 \% C.L.) in germanium has been set.
[ { "version": "v1", "created": "Mon, 9 May 2022 14:12:00 GMT" }, { "version": "v2", "created": "Thu, 14 Jul 2022 14:43:57 GMT" } ]
2022-09-13T00:00:00
[ [ "Alekseev", "I.", "", "the nuGeN Collaboration" ], [ "Balej", "K.", "", "the nuGeN Collaboration" ], [ "Belov", "V.", "", "the nuGeN Collaboration" ], [ "Evseev", "S.", "", "the nuGeN Collaboration" ], [ "Filosofov", "D.", "", "the nuGeN Collaboration" ], [ "Fomina", "M.", "", "the nuGeN Collaboration" ], [ "Hons", "Z.", "", "the nuGeN Collaboration" ], [ "Karaivanov", "D.", "", "the nuGeN Collaboration" ], [ "Kazartsev", "S.", "", "the nuGeN Collaboration" ], [ "Khushvaktov", "J.", "", "the nuGeN Collaboration" ], [ "Kuznetsov", "A.", "", "the nuGeN Collaboration" ], [ "Lubashevskiy", "A.", "", "the nuGeN Collaboration" ], [ "Medvedev", "D.", "", "the nuGeN Collaboration" ], [ "Ponomarev", "D.", "", "the nuGeN Collaboration" ], [ "Rakhimov", "A.", "", "the nuGeN Collaboration" ], [ "Shakhov", "K.", "", "the nuGeN Collaboration" ], [ "Shevchik", "E.", "", "the nuGeN Collaboration" ], [ "Shirchenko", "M.", "", "the nuGeN Collaboration" ], [ "Smolek", "K.", "", "the nuGeN Collaboration" ], [ "Rozov", "S.", "", "the nuGeN Collaboration" ], [ "Rozova", "I.", "", "the nuGeN Collaboration" ], [ "Vasilyev", "S.", "", "the nuGeN Collaboration" ], [ "Yakushev", "E.", "", "the nuGeN Collaboration" ], [ "Zhitnikov", "I.", "", "the nuGeN Collaboration" ] ]
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1704.05476
Nilanjan De Dr.
Nilanjan De
Computing Reformulated First Zagreb Index of Some Chemical Graphs as an Application of Generalized Hierarchical Product of Graphs
12 pages
null
null
null
cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The generalized hierarchical product of graphs was introduced by L. Barri\'ere et al in 2009. In this paper, reformulated first Zagreb index of generalized hierarchical product of two connected graphs and hence as a special case cluster product of graphs are obtained. Finally using the derived results the reformulated first Zagreb index of some chemically important graphs such as square comb lattice, hexagonal chain, molecular graph of truncated cube, dimer fullerene, zig-zag polyhex nanotube and dicentric dendrimers are computed.
[ { "version": "v1", "created": "Tue, 18 Apr 2017 18:02:39 GMT" } ]
2017-04-20T00:00:00
[ [ "De", "Nilanjan", "" ] ]
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2004.01989
Manuel Lainz Valcazar
Alexandre Anahory Simoes, Manuel de Le\'on, Manuel Lainz Valc\'azar, David Mart\'in de Diego
Contact geometry for simple thermodynamical systems with friction
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null
null
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math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using contact geometry we give a new characterization of a simple but important class of thermodynamical systems which naturally satisfy the first law of thermodynamics (total energy preservation) and the second law (increase of entropy). We completely clarify its qualitative dynamics, the underlying geometrical structures and we show how to use discrete gradient methods.
[ { "version": "v1", "created": "Sat, 4 Apr 2020 18:05:39 GMT" } ]
2020-04-07T00:00:00
[ [ "Simoes", "Alexandre Anahory", "" ], [ "de León", "Manuel", "" ], [ "Valcázar", "Manuel Lainz", "" ], [ "de Diego", "David Martín", "" ] ]
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