cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The diffuse supernova neutrino background as a probe of late-time neutrino mass generation
Creators: name: de Gouvêa, André
name: Martinez-Soler, Ivan
name: Perez-Gonzalez, Yuber F.
name: Sen, Manibrata
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The relic neutrinos from old supernova explosions are among the most ancient neutrino fluxes within experimental reach. Thus, the diffuse supernova neutrino background (DSNB) could teach us if neutrino masses were different in the past (redshifts $z\lesssim 5$). Oscillations inside the supernova depend strongly on the neutrino mass-squared differences and the values of the mixing angles, rendering the DSNB energy spectrum sensitive to variations of these parameters. Considering a purely phenomenological parameterization of the neutrino masses as a function of redshift, we compute the expected local DSNB spectrum here on Earth. Given the current knowledge of neutrino oscillation parameters, specially the fact that $|U_{e3}|^2$ is small, we find that the $ν_e$ spectrum could be significantly different from standard expectations if neutrinos were effectively massless at $z\gtrsim1$ as long as the neutrino mass ordering is normal. On the other hand, the $\overlineν_e$ flux is not expected to be significantly impacted. Hence, a measurement of both the neutrino and antineutrino components of the DSNB should allow one to test the possibility of recent neutrino mass generation.
description: 15 pages, 9 figures
Low-energy photon and pion scattering in holographic QCD
Creators: name: Colangelo, Pietro
name: Sanz-Cillero, Juan Jose
name: Zuo, Fen
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Using holographic models where chiral symmetry is broken through IR b.c.'s, we determine a novel set of relations between QCD matrix elements. In particular, we find that the amplitudes of the three processes pi pi->pi pi, gamma gamma->pi pi and gamma->pi pi pi involve a single scalar function h(Q^2) given by a suitable 5D integral of the EoM Green's function. In a phenomenological analysis of gamma gamma->pi pi we find an overall agreement with the experimental cross section for a broad range of energy. Moreover, the polarizabilities at low energies show a fair agreement between the holographic approach, previous computations and experiment.
description: 24+1 pages, 3 png figures. The normalization of the cross section in Eq. (4.2) has been corrected in this version and extra comments have been added to the paragraphs before and after it. No additional modification introduced in the article. Erratum can be found at Erratum-ibid. 1408 (2014) 033 with DOI: 10.1007/JHEP08(2014)033
Distributions of points on non-extensible closed curves in $\R^3$ realizing maximum energies
Creators: name: Cheng, Shiu-Yuen
name: Wang, Zhongzi
Publisher: name: arXiv
Year: 2023
Subjects: subject: Geometric Topology (math.GT)
subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: Primary 57M25, Secondary 52C25

description: Let $G_n$ be a non-extensible, flexible closed curve of length $n$ in the 3-space $\R^3$ with $n$ particles $A_1$,...,$A_n$ evenly fixed (according to the arc length of $G_n$) on the curve. Let $f:(0, \infty)\to \R$ be an increasing and continuous function. Define an energy function $$E^f_n(G_n)= \sum_{p< q} f(|A_pA_q|),$$ where $|A_pA_q|$ is the distance between $A_p$ and $A_q$ in $\R^3$. We address a natural and interesting problem: {\it What is the shape of $G_n$ when $E^f_n(G_n)$ reaches the maximum? } In many natural cases, one such case being $f(t) = t^α$ with $0 < α\le 2$, the maximizers are regular $n$-gons and in all cases the maximizers are (possibly degenerate) convex $n$-gons with each edge of length 1.
description: 18 pages, 11 figures, accepted by Geometriae Dedicata
Leading-order nucleon self-energy in relativistic chiral effective field theory
Creators: name: Colucci, Giuseppe
name: Sedrakian, Armen
name: Rischke, Dirk H.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We apply thermal field theory methods to compute microscopically the nucleon self-energy arising from one-pion exchange in isospin-symmetric nuclear matter and neutron matter. A self-consistent numerical scheme is introduced and its convergence is demonstrated. The repulsive contribution from the Fock exchange diagram to the energy per nucleon in symmetric nuclear matter is obtained.
description: v3: matches published version, 8 pages, 6 figures. Removed discussion of saturation, changed title to reflect the shortened content. v1: 9 pages, 7 figures, v2: minor amendments
Роль средового фактора в развитии тяжелых форм речевого дизонтогенеза
Creators: name: Шипкова К.М.
name: Аханькова Т.Е.
Publisher: name: Медицинская психология в России
Year: 2020
Subjects: нарушения речи у детей
речевой дизонтогенез
нарушения речевой коммуникации
средовой фактор
аутистические расстройства.

description: В работе исследуется средовой фактор как один из триггерных механизмов тяжелых форм нарушения раннего речевого развития. Рассматривается ряд компонентов средового фактора — типология коммуникативных алгоритмов родителей, их личностные характеристики и тип детско-родительских отношений. Выборка: 30 детей 3—8 лет и их родителей. Соотношение мальчик/девочка составило 3/1. У 77% детей отмечалось 8/9 баллов по шкале Апгар. По шкале Manitoba у 57% был низкий риск перинатальной патологии, у 43% — высокий. Возраст родителей: матери — 18—30 лет, отцы — 31—40 лет. Распре-деление детей с тяжелой речевой патологией по типологии нарушенного речевого развития показало, что у 91% выборки имелись те или иные нарушения аутистического спектра. Расстройства социального функционирования 58,6% (F.94.8); другие общие расстройства развития 31,0% (F.84.8); детский аутизм 6,9% (F.84); смешанные специфические расстройства психологического развития 3,4% (F.83). Представлены данные о доминирующем типе детско-родительских отношений, коммуникативных алгоритмов и типе эмоционально-личностного реагирования, характерных для отцов и матерей. Для родителей была характерна недооценка тяжести речевых проблем ребенка. 52% родителей считала, что «возможность понимания ребенком обращенной речи» у ребенка «достаточная», 48% расценивала ее как «сниженную». Превалирующим типом детско-родительских отношений в семьях этих детей была гиперопека. У 24% детей были сформированы, 62% — частично сформированы навыки самообслуживания, а у 14% не сформированы. По типу коммуникационных алгоритмов родители сами испытывали трудности в коммуникации. Большинство матерей (76%) и отцов (66%) характеризовали себя как «избирательно-общительные» или «малообщительные». «Проречь» детей с выраженным речевым дизонтогенезом была, в силу недостаточности коммуникативных навыков родителей, сенсорно-обедненной. Анализируется связь между коммуникативными и личностными характеристиками родителей и спецификой отклонений в становлении речевой коммуникации у детей. Ставится вопрос создания направленных психолого-педагогических обучающих программ для родителей детей с тяжелой речевой патологией.
MaxSAT Resolution and Subcube Sums
Creators: name: Filmus, Yuval
name: Mahajan, Meena
name: Sood, Gaurav
name: Vinyals, Marc
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computational Complexity (cs.CC)
subject: FOS: Computer and information sciences
subject: 03F20

description: We study the MaxRes rule in the context of certifying unsatisfiability. We show that it can be exponentially more powerful than tree-like resolution, and when augmented with weakening (the system MaxResW), p-simulates tree-like resolution. In devising a lower bound technique specific to MaxRes (and not merely inheriting lower bounds from Res), we define a new proof system called the SubCubeSums proof system. This system, which p-simulates MaxResW, can be viewed as a special case of the semialgebraic Sherali-Adams proof system. In expressivity, it is the integral restriction of conical juntas studied in the contexts of communication complexity and extension complexity. We show that it is not simulated by Res. Using a proof technique qualitatively different from the lower bounds that MaxResW inherits from Res, we show that Tseitin contradictions on expander graphs are hard to refute in SubCubeSums. We also establish a lower bound technique via lifting: for formulas requiring large degree in SubCubeSums, their XOR-ification requires large size in SubCubeSums.
Сравнительный анализ качества жизни населения нефтегазоносных регионов
Creators: name: Башбаева М.А.
name: Зиналиева А.Н.
name: Мамырбаев А.А.
name: Дуйсенова А.А.
name: Дженалаева Г.А.
Publisher: name: Медицинская психология в России
Year: 2020
Subjects: нефтегазоносный регион
качество жизни
опросник SF-36
физический и метальный компоненты здоровья.

description: В работе представлены результаты исследования качества жизни населения нефтегазоносных регионов Актюбинской и Западно-Казахстанской областей. При помощи опросника SF-36 исследовано субъективное восприятие степени ограничения своей повседневной жизни проблемами, связанными со здоровьем, в течение последних четырех недель перед проведением обследования респондентов исследуемых регионов. Результаты исследования выявили наличие физических проблем (69,3) у респондентов Актюбинской области и по шкале «общее состояние здоровья» (63,9) у исследуемых Западно-Казахстанской области, проявляющихся интенсивным болевым синдромом, что в целом ограничивает физическую активность — ходьбу, подъем по лестнице, выполнение повседневных физических нагрузок, способность заниматься нормально какой-либо деятельностью, включая работу по дому. Низкие значения шкалы «жизненная активность» населения нефтегазоносных регионов Актюбинской (74,6) и Западно-Казахстанской областей (72,3) свидетельствуют о тенденции нарастания утомления исследуемых, снижении их жизненной активности, а низкие значения шкалы «психическое здоровье» (74,8) у населения НГ Западно-Казахстанской области указывают на наличие психологических проблем — депрессивных, тревожных состояний, связанных с разработкой нефтегазовых месторождений.
MESSENGER observations of multiscale Kelvin‐Helmholtz vortices at Mercury
Creators: name: Gershman, Daniel J.
name: Raines, Jim M.
name: Slavin, James A.
name: Zurbuchen, Thomas H.
name: Sundberg, Torbjörn
name: Boardsen, Scott A.
name: Anderson, Brian J.
name: Korth, Haje
name: Solomon, Sean C.
Publisher: name: Columbia University
Year: 2015
Subjects: Planetary science
Planets--Magnetospheres

description: Observations by the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft in Mercury's magnetotail demonstrate for the first time that Na+ ions exert a dynamic influence on Mercury's magnetospheric system. Na+ ions are shown to contribute up to ~30% of the ion thermal pressure required to achieve pressure balance in the premidnight plasma sheet. High concentrations of planetary ions should lead to Na+ dominance of the plasma mass density in these regions. On orbits with northward‐oriented interplanetary magnetic field and high (i.e., >1 cm−3) Na+ concentrations, MESSENGER has often recorded magnetic field fluctuations near the Na+ gyrofrequency associated with the Kelvin‐Helmholtz (K‐H) instability. These nightside K‐H vortices are characteristically different from those observed on Mercury's dayside that have a nearly constant wave frequency of ~0.025 Hz. Collectively, these observations suggest that large spatial gradients in the hot planetary ion population at Mercury may result in a transition from a fluid description to a kinetic description of vortex formation across the dusk terminator, providing the first set of truly multiscale observations of the K‐H instability at any of the diverse magnetospheric environments explored in the solar system.
title: Ανάπτυξη ενός βασισμένου στο web πληροφοριακού συστήματος δημοπράτησης αγροτικών προϊόντων
Creators: name: Ζουμαδάκη Φιλία-Ελένη
Publisher: name: Technical University of Crete
Year: 2011

description: Μη διαθέσιμο
title: Υλοποίηση ομόχειρου διαχειριστή ουρών σε γλώσσα περιγραφής υλικού HDL implementation of a pipelined queue manager
Creators: name: Πέτσα Αικατερίνη
Publisher: name: Technical University of Crete
Year: 2011

description: Μη διαθέσιμο
Tidally induced spiral arm wraps encoded in phase space
Creators: name: Antoja, T.
name: Ramos, P.
name: López-Guitart, F.
name: Anders, F.
name: Bernet, M.
name: Laporte, C.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We study the dynamics of tidally induced spiral arms in our Galaxy in the context of its encounters with Sagittarius. We built toy models of the interaction between a host and a satellite galaxy using orbital integrations after a tidal encounter. We derived analytically the shape of the structures in phase space as a function of time for simple power-law potential models. We compared these models to a more realistic N-body simulation of the MW Sagittarius-like interaction and to data from Gaia DR3. As found before, an impulsive distant tidal approach of a galactic satellite leads to a two-armed spiral structure made of orbits in between their apocentres and pericentres, thus, with average negative galactocentric radial velocity. The two-arm pattern rotates at an angular speed of $ω-1/2κ$ which depends on radius, thus causing a wind-up with time. This produces ridges in the $R$-$V_ϕ$ projection with alternating signs of $V_R$ and oscillations of $V_R$ in the $L_Z$-$ϕ$ space, like those observed in the Gaia data. The frequency of these kinematic features increases with time, offering a powerful means to infer the potential and the perturbation's onset time and azimuthal phase. Fourier analysis allows us to date the impact times of simple models and even to date perturbations from various pericentric passages. For the MW, the Fourier analysis indicates a superposition of two different frequencies, as in previous studies. Assuming that both are due to impulsive and distant pericentre passages, we find perturbation times <0.6 Gyr and in the range of 0.8-2.1 Gyr. The latter is compatible with a previous pericentre of Sagittarius and would be related to four wraps of the spiral arms in the observed radial range. Further work on the self-gravitating response of galactic discs and possible degeneracies with secular processes by the bar is necessary. (ABR)
description: accepted in A&A after consideration of the referee's comments, including re-analysis with Gaia DR3
Symmetric quantum fully homomorphic encryption with perfect security
Creators: name: Liang, Min
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Suppose some data have been encrypted, can you compute with the data without decrypting them? This problem has been studied as homomorphic encryption and blind computing. We consider this problem in the context of quantum information processing, and present the definitions of quantum homomorphic encryption (QHE) and quantum fully homomorphic encryption (QFHE). Then, based on quantum one-time pad (QOTP), we construct a symmetric QFHE scheme, where the evaluate algorithm depends on the secret key. This scheme permits any unitary transformation on any $n$-qubit state that has been encrypted. Compared with classical homomorphic encryption, the QFHE scheme has perfect security. Finally, we also construct a QOTP-based symmetric QHE scheme, where the evaluate algorithm is independent of the secret key.
description: 16 pages, the final version, Quantum information processing, 2013
title: Μελέτη γεωθερμικού συστήματος, ανάλυση της μεθόδου Thermal Response Test (TRT) και εύρεση των δυο βασικών παραμέτρων σχεδιασμού γεωθερμικών συστημάτων με χρήση κατάλληλου μοντέλου πάνω σε πραγματικά δεδομένα
Creators: name: Ζούφιος Ιωάννης
Publisher: name: Technical University of Crete
Year: 2011

description: Μη διαθέσιμο
Wigner meets 't Hooft near the black hole horizon
Creators: name: Johnson, Clifford V.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Recent work on Euclidean quantum gravity, black hole thermodynamics, and the holographic principle has seen the return of random matrix models as a powerful tool. It is explained how they allow for the study of the physics well beyond the perturbative expansion. In fact, a fully non-perturbative treatment naturally unites the familiar approach of summing over smooth geometries of all topologies with the statistical approach to characterizing the typical properties of a Hamiltonian. Remarkably, this leads to an explicit excavation of the underlying microstates of quantum gravity that has applications to the low temperature dynamics of a large class of black holes.
description: A quick read at 10 double-spaced pages (plus bibliography). Essay written for the Gravity Research Foundation 2022 Awards for Essays on Gravitation. (Honorable Mention awarded.)
Graded Geometric Structures Underlying F-Theory Related Defect Theories
Creators: name: Oikonomou, V. K.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In the context of F-theory, we study the related eight dimensional super-Yang-Mills theory and reveal the underlying supersymmetric quantum mechanics algebra that the fermionic fields localized on the corresponding defect theory are related to. Particularly, the localized fermionic fields constitute a graded vector space, and in turn this graded space enriches the geometric structures that can be built on the initial eight-dimensional space. We construct the implied composite fibre bundles, which include the graded affine vector space and demonstrate that the composite sections of this fibre bundle are in one-to-one correspondence to the sections of the square root of the canonical bundle corresponding to the submanifold on which the zero modes are localized.
description: Revised Version
Rapid Image Labeling via Neuro-Symbolic Learning
Creators: name: Wang, Yifeng
name: Tu, Zhi
name: Xiang, Yiwen
name: Zhou, Shiyuan
name: Chen, Xiyuan
name: Li, Bingxuan
name: Zhang, Tianyi
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: The success of Computer Vision (CV) relies heavily on manually annotated data. However, it is prohibitively expensive to annotate images in key domains such as healthcare, where data labeling requires significant domain expertise and cannot be easily delegated to crowd workers. To address this challenge, we propose a neuro-symbolic approach called Rapid, which infers image labeling rules from a small amount of labeled data provided by domain experts and automatically labels unannotated data using the rules. Specifically, Rapid combines pre-trained CV models and inductive logic learning to infer the logic-based labeling rules. Rapid achieves a labeling accuracy of 83.33% to 88.33% on four image labeling tasks with only 12 to 39 labeled samples. In particular, Rapid significantly outperforms finetuned CV models in two highly specialized tasks. These results demonstrate the effectiveness of Rapid in learning from small data and its capability to generalize among different tasks. Code and our dataset are publicly available at https://github.com/Neural-Symbolic-Image-Labeling/
description: This paper was accepted by the 2023 ACM SIGKDD International Conference on Knowledge Discovery and Data Mining
Thermal ion kinetic effects and Landau damping in fishbone modes
Creators: name: Liu, Chang
name: Jardin, Stephen C.
name: Bao, Jian
name: Gorelenkov, Nikolai
name: Brennan, Dylan P.
name: Yang, James
name: Podesta, Mario
Publisher: name: arXiv
Year: 2022
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The kinetic-MHD hybrid simulation approach for macroscopic instabilities in plasmas can be extended to include the kinetic effects of both thermal ions and energetic ions. The new coupling scheme includes synchronization of density and parallel velocity between thermal ions and MHD, in addition to pressure coupling, to ensure the quasineutrality condition and avoid numerical errors. The new approach has been implemented in the kinetic-MHD code M3D-C1-K, and was used to study the thermal ion kinetic effects and Landau damping in fishbone modes in both DIII-D and NSTX. It is found that the thermal ion kinetic effects can cause an increase of the frequencies of the non-resonant $n=1$ fishbone modes driven by energetic particles for $q_\mathrm{min}>1$, and Landau damping can provide additional stabilization effects. A nonlinear simulation for $n=1$ fishbone mode in NSTX is also performed, and the perturbation on magnetic flux surfaces and the transport of energetic particles are calculated.
description: 18 pages, 16 figures
title: Σύστημα διαχείρισης με υποστήριξη χρηστών με σκοπό την αναπαράσταση γεγονότων πάνω στο Google Earth
Creators: name: Ταραντίλης Νίκος
Publisher: name: Technical University of Crete
Year: 2011

description: Μη διαθέσιμο
title: Επίδραση σημαντικής εγκατεστημένης ισχύος φωτοβολταϊκών σε υποσταθμό υψηλής/μέσης τάσης
Creators: name: Λαποκωνσταντάκης Νικόλαος
Publisher: name: Technical University of Crete
Year: 2011

description: Μη διαθέσιμο
Topological 4-manifolds with 4-dimensional fundamental group
Creators: name: Kasprowski, Daniel
name: Land, Markus
Publisher: name: arXiv
Year: 2020
Subjects: subject: Geometric Topology (math.GT)
subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: 57K40, 57N65

description: Let $π$ be a group satisfying the Farrell-Jones conjecture and assume that $Bπ$ is a 4-dimensional Poincaré duality space. We consider topological, closed, connected manifolds with fundamental group $π$ whose canonical map to $Bπ$ has degree 1 and show that two such manifolds are s-cobordant if and only if their equivariant intersection forms are isometric and they have the same Kirby-Siebenmann invariant. If $π$ is good in the sense of Freedman, it follows that two such manifolds are homeomorphic if and only if they are homotopy equivalent and have the same Kirby--Siebenmann invariant. This shows rigidity in many cases that lie between aspherical 4-manifolds, where rigidity is expected by Borel's conjecture, and simply connected manifolds where rigidity is a consequence of Freedman's classification results.
description: Results are generalized to the non-orientable case, to appear in Glasgow Math. J., 8 pages
Mass-loss rates of cool evolved stars in M33 galaxy
Creators: name: Javadi, Atefeh
name: van Loon, Jacco Th.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We have conducted a near-infrared monitoring campaign at the UK InfraRed Telescope (UKIRT), of the Local Group spiral galaxy M33 (Triangulum). In this paper, we present the dust and gas mass-loss rates by the pulsating Asymptotic Giant Branch (AGB) stars and red supergiants (RSGs) across the stellar disc of M33.
description: A talk presented at the "IAU symposium 366 : The Origin of Outflows in Evolved Stars", to be published in the "IAU Proceedings Series"
Computational reproducibility: Examining verification errors and frictions
Creators: name: Thompson, Cheryl
name: Thu-Mai Christian
Publisher: name: Zenodo
Year: 2021

description: Data archives, libraries, and publishers are extending their services to support computational reproducibility of results reported in manuscripts. Computational reproducibility is having enough information about the data, code, and compute environment to re-run and reproduce analyses. While archives and publishers are adopting policies and audit workflows to verify the results in a manuscript, many opponents express concerns about the additional effort, time, and specialized expertise being placed on authors. What are the challenges that researchers face in complying with computational reproducibility and transparency policies? The American Journal of Political Science (AJPS) adopted a verification policy requiring authors to make available all research materials needed to reproduce the results in a manuscript. As an independent third party, the Odum Institute performs the computational reproducibility check on the submitted materials with quantitative analyses. The Odum Institute has collected detailed data about the verification process for all reviewed manuscripts including errors encountered, number of resubmissions, and submission package characteristics, providing a novel dataset to explore challenges that authors face. This paper will report results from qualitative coding and analysis of verification reports for 105 AJPS manuscripts. Twenty-three errors that authors commonly make in replication packages were identified, representing 7 categories: code, data, documentation, file, methods, results, and technology. Together, these sets of errors provide a more holistic picture of challenges faced by authors in making their research reproducible. These challenges range in terms of causes, scope, significance, persistence, and repetition. These findings will be discussed in relation to questions of services, tools, and trainings. How can archives and libraries help researchers comply with reproducibility policies? Which categories of errors should we prioritize? These questions will lead to a discussion on translating reproducibility policies and recommendations into actionable, local practices and services.
Strong-coupling analysis of scanning tunneling spectra in Bi$_2$Sr$_2$Ca$_2$Cu$_3$O$_{10+δ}$
Creators: name: Berthod, C.
name: Fasano, Y.
name: Maggio-Aprile, I.
name: Piriou, A.
name: Giannini, E.
name: de Castro, G. Levy
name: Fischer, Ø.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We study a series of spectra measured in the superconducting state of optimally-doped Bi-2223 by scanning tunneling spectroscopy. Each spectrum, as well as the average of spectra presenting the same gap, is fitted using a strong-coupling model taking into account the band structure, the BCS gap, and the interaction of electrons with the spin resonance. After describing our measurements and the main characteristics of the strong-coupling model, we report the whole set of parameters determined from the fits, and we discuss trends as a function of the gap magnitude. We also simulate angle-resolved photoemission spectra, and compare with recent experimental results.
description: Published version
Stability of Parker's Solar Wind Solution Near the Solar Surface
Creators: name: Shivamoggi, Bhimsen
Publisher: name: arXiv
Year: 2020
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Stability of Parker's steady solar wind solution near the solar surface is systematically investigated by posing a Sturm-Liouville problem for this solution. Parker's solar wind solution, whether it turns into a breeze or a supersonic wind depending on the pressure in the interstellar medium, is shown to describe the solar wind to start in a stable way as it leaves the solar surface from a state of: rest, co-rotation with the Sun, slow motion. The isothermal gas flow assumption in Parker's solar wind model is then relaxed, and more realistic barotropic fluid and diabatic models are used for the gas flow. The stability of the solar wind flow, as it starts from a state of rest at the solar surface, is shown to continue to hold. Parker's solar wind solution therefore appears to be a stable attractor of this dynamical system.
Edge-critical subgraphs of Schrijver graphs II: The general case
Creators: name: Kaiser, Tomáš
name: Stehlík, Matěj
Publisher: name: arXiv
Year: 2020
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C15

description: We give a simple combinatorial description of an $(n-2k+2)$-chromatic edge-critical subgraph of the Schrijver graph $\mathrm{SG}(n,k)$, itself an induced vertex-critical subgraph of the Kneser graph $\mathrm{KG}(n,k)$. This extends the main result of [J. Combin. Theory Ser. B 144 (2020) 191--196] to all values of $k$, and sharpens the classical results of Lovász and Schrijver from the 1970s.
Non-minimal coupling of scalar and gauge fields with gravity: an entropy current and linearized second law
Creators: name: Biswas, Parthajit
name: Dhivakar, Prateksh
name: Kundu, Nilay
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: This work extends the proof of a local version of the linearized second law involving an entropy current with non-negative divergence by including the arbitrary non-minimal coupling of scalar and $U(1)$ gauge fields with gravity. In recent works, the construction of entropy current to prove the linearized second law rested on an important assumption about the possible matter couplings to gravity: the corresponding matter stress tensor was assumed to satisfy the null energy conditions. However, the null energy condition can be violated, even classically, when the non-minimal coupling of matter fields to gravity is considered. Considering small dynamical perturbations around stationary black holes in diffeomorphism invariant theories of gravity with non-minimal coupling to scalar or gauge fields, we prove that an entropy current with non-negative divergence can still be constructed. The additional non-minimal couplings that we have incorporated contribute to the entropy current, which may even survive in the equilibrium limit. We also obtain a spatial current on the horizon apart from the entropy density in out-of-equilibrium situations. We achieve this by using a boost symmetry of the near horizon geometry, which constraints the off-shell structure of a specific component of the equations of motion with newer terms due to the non-minimal couplings. The final expression for the entropy current is $U(1)$ gauge-invariant for gauge fields coupled to gravity. We explicitly check that the entropy current obtained from our abstract arguments is consistent with the expressions already available in the literature for specific model theories involving non-minimal coupling of matter with higher derivative theories of gravity. Finally, we also argue that the physical process version of the first law holds for these theories with arbitrary non-minimal matter couplings.
description: 31 pages + appendices. Section 7 on the physical process version of the first law with non-minimal interactions has been added. Version to appear in JHEP
Do Graduate Students Dream of -for- Loops? Ph.D. Students and Data Services at Emory University
Creators: name: O'Reilly, Robert
Publisher: name: Zenodo
Year: 2021

description: In addition to the work provided by full-time data librarians, data services at Emory University are also provided by advanced graduate students who have fellowships to work in different divisions within the libraries. These fellows play a key role in helping undergraduates (and some graduate students) with locating relevant data and especially with cleaning data into usable states. In this presentation, I will talk about the fellowship program, the backgrounds of graduate students who have had fellowships, how we select graduate students for fellowships, and the sorts of work that the fellows do. As undergraduates come to the libraries with increasingly intricate and complicated questions, data librarians at Emory have taken on more of a role in helping them clean and manage data. Consequently, the training and orientation which fellows receive increasingly emphasize such activities. This presentation will include an overview of the sequence of training exercises for cleaning and managing data in R and Stata that we use to introduce fellows to the types of questions undergraduates often have. The exercises also serve to introduce fellows to the mix of principles and practical considerations that inform how we support data-intensive research at the university, including how we (try to!) encourage undergraduates to use data in more transparent and reproducible fashions.
Performance Analysis of Metaheuristic Optimization Algorithms in Estimating the Interfacial Heat Transfer Coefficient on Directional Solidification
Creators: name: Stieven, Gianfranco de M.
name: Oliveira, Edilma P.
name: Lins, Erb F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Signal Processing (eess.SP)
subject: Other Statistics (stat.OT)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: In this paper is proposed an evaluation of ten metaheuristic optimization algorithms applied on the inverse optimization of the Interfacial Heat Transfer Coefficient (IHTC) coupled on the solidification phenomenon. It was considered an upward directional solidification system for Al-7wt.% Si alloy and, for IHTC model, a exponential time function. All thermophysical properties of the alloy were considered constant. Scheil Rule was used as segregation model ahead phase-transformation interface. Optimization results from Markov Chain Monte Carlo method (MCMC) were considered as reference. Based on average, quantiles 95% and 5%, kurtosis, average iterations and absolute errors of the metaheuristic methods, in relation to MCMC results, the Flower Pollination Algorithm (FPA) and Moth-Flame Optimization (MFO) presented the most appropriate results, outperforming the other methods in this particular phenomenon, based on these metrics. The regions with the most probable values for parameters in IHTC time function were also determined.
description: 27 pages, 7 figures, 4 tables, 67 references cited, preprint
Improving solar wind modeling at Mercury: Incorporating transient solar phenomena into the WSA‐ENLIL model with the Cone extension
Creators: name: Dewey, Ryan M.
name: Baker, Daniel N.
name: Anderson, Brian J.
name: Benna, Mehdi
name: Johnson, Catherine L.
name: Korth, Haje
name: Gershman, Daniel J.
name: Ho, George C.
name: McClintock, William E.
name: Odstrcil, Dusan
name: Philpott, Lydia C.
name: Raines, Jim M.
name: Schriver, David
name: Slavin, James A.
name: Solomon, Sean C.
name: Winslow, Reka M.
name: Zurbuchen, Thomas H.
Publisher: name: Columbia University
Year: 2015
Subjects: Planetary science
Solar wind
Solar wind--Mathematical models
Planets--Magnetospheres

description: Coronal mass ejections (CMEs) and other transient solar phenomena play important roles in magnetospheric and exospheric dynamics. Although a planet may interact only occasionally with the interplanetary consequences of these events, such transient phenomena can result in departures from the background solar wind that often involve more than an order of magnitude greater ram pressure and interplanetary electric field applied to the planetary magnetosphere. For Mercury, an order of magnitude greater ram pressure combined with high Alfvén speeds and reconnection rates can push the magnetopause essentially to the planet's surface, exposing the surface directly to the solar wind flow. In order to understand how the solar wind interacts with Mercury's magnetosphere and exosphere, previous studies have used the Wang‐Sheeley‐Arge (WSA)‐ENLIL solar wind modeling tool to calculate basic and composite solar wind parameters at Mercury's orbital location. This model forecasts only the background solar wind, however, and does not include major transient events. The Cone extension permits the inclusion of CMEs and related solar wind perturbations and thus enables characterization of the effects of strong solar wind disturbances on the Mercury system. The Cone extension is predicated on the assumption of constant angular and radial velocities of CMEs to integrate these phenomena into the WSA‐ENLIL coupled model. Comparisons of the model results with observations by the MESSENGER spacecraft indicate that the WSA‐ENLIL+Cone model more accurately forecasts total solar wind conditions at Mercury and has greater predictive power for magnetospheric and exospheric processes than the WSA‐ENLIL model alone.
title: Αρχιτεκτονικός σχεδιασμός ενός διαστημικού σταθμού σταθμού στα σύννεφα της Αφροδίτης
Creators: name: Λιναράκη Δέσποινα
Publisher: name: Technical University of Crete
Year: 2012

description: Μη διαθέσιμο
Weighted Sato-Tate Vertical Distribution of the Satake Parameter of Maass Forms on PGL(N)
Creators: name: Zhou, Fan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11

description: We formulate a conjectured orthogonality relation between the Fourier coefficients of Maass forms on PGL(N) for N>=2. Based on the work of Goldfeld-Kontorovich and Blomer for N=3, and on our conjecture for N>=4, we prove a weighted vertical equidistribution theorem (with respect to the generalized Sato-Tate measure) for the Satake parameter of Maass forms at a finite prime. For N=3, the rate of convergence for the equidistribution theorem is obtained.
MESSENGER observations of Mercury's dayside magnetosphere under extreme solar wind conditions
Creators: name: Slavin, James A.
name: DiBraccio, Gina A.
name: Gershman, Daniel J.
name: Imber, Suzanne M.
name: Poh, Gangkai
name: Raines, Jim M.
name: Zurbuchen, Thomas H.
name: Jia, Xianzhe
name: Baker, Daniel N.
name: Glassmeier, Karl‐Heinz
name: Livi, Stefano A.
name: Boardsen, Scott A.
name: Cassidy, Timothy A.
name: Sarantos, Menelaos
name: Sundberg, Torbjorn
name: Masters, Adam
name: Johnson, Catherine L.
name: Winslow, Reka M.
name: Anderson, Brian J.
name: Korth, Haje
name: McNutt Jr., Ralph L.
name: Solomon, Sean C.
Publisher: name: Columbia University
Year: 2014
Subjects: Planetary science
Planets--Magnetospheres
Solar wind

description: The structure of Mercury's dayside magnetosphere is investigated during three extreme solar wind dynamic pressure events. Two were the result of coronal mass ejections (CMEs), and one was from a high‐speed stream (HSS). The inferred pressures for these events are ~ 45 to 65 nPa. The CME events produced thick, low‐β (where β is the ratio of plasma thermal to magnetic pressure) plasma depletion layers and high reconnection rates of 0.1–0.2, despite small magnetic shear angles across the magnetopause of only 27 to 60°. For one of the CME events, brief, ~ 1–2 s long diamagnetic decreases, which we term cusp plasma filaments, were observed within and adjacent to the cusp. These filaments may map magnetically to flux transfer events at the magnetopause. The HSS event produced a high‐β magnetosheath with no plasma depletion layer and large magnetic shear angles of 148 to 166°, but low reconnection rates of 0.03 to 0.1. These results confirm that magnetic reconnection at Mercury is very intense, and its rate is primarily controlled by plasma β in the adjacent magnetosheath. The distance to the subsolar magnetopause is reduced during these events from its mean of 1.45 Mercury radii (R M) from the planetary magnetic dipole to between 1.03 and 1.12 R M. The shielding provided by induction currents in Mercury's interior, which temporarily increase Mercury's magnetic moment, was negated by reconnection‐driven magnetic flux erosion.
Exclusive $π^0$ production at EIC of China within handbag approach
Creators: name: Goloskokov, S. V.
name: Xie, Ya-Ping
name: Chen, Xurong
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The exclusive $π^0$ electroproduction is analyzed within the handbag approach based on Generalized Parton Distributions (GPDs) factorization. We consider the leading-twist contribution together with the transversity effects. It is shown that the transversity, $H_T$ and $\bar E_T$ GPDs are essential in the description of $π^0$ cross section. Predictions for future Electron-Ion Collider of China (EicC) energy range are done. It is found that transversity dominance $σ_T\ggσ_L$, observed at low energies is valid up to EicC energy range.
description: 14 pages, 16 figures
Fluctuation relations without uniform large deviations
Creators: name: Gradenigo, Giacomo
name: Sarracino, Alessandro
name: Puglisi, Andrea
name: Touchette, Hugo
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the fluctuations of a stochastic Maxwell-Lorentz particle model driven by an external field to determine the extent to which fluctuation relations are related to large deviations. Focusing on the total entropy production of this model in its steady state, we show that, although the probability density of this quantity globally satisfies (by definition) a fluctuation relation, its negative tail decays exponentially with time, whereas its positive tail decays slower than exponentially with time because of long collision-free trajectories. This provides an example of physical system for which the fluctuation relation does not derive, as commonly thought, from a probability density decaying everywhere exponentially with time or, in other words, from a probability density having a uniform large deviation form.
description: 12 pages, 1 figure; v2: published version
ReprohackNL 2019: Enhancing research reproducibility at Dutch Universities
Creators: name: Hettne, Kristina
name: Proppert, Ricarda
name: Nab, Linda
name: Saunero, Paloma Rojas
name: Gawehns, Daniela
Publisher: name: Zenodo
Year: 2021

description: University Libraries around the world play a crucial role in Open Science, contributing to more transparent, reproducible and reusable research. The Center for Digital Scholarship (CDS) at Leiden University (LU) is a scholarly lab located in the LU Library. The CDS employes two complementary strategies to improve open data literacy among Leiden's scholars: existing top-down structures are used to provide Open Science training and services, while bottom-up initiatives are actively supported by offering CDS's expertise and facilities. A prime example of how bottom-up initiatives can blossom with the help of the CDS is the ReproHack initiative. ReproHack – a reproducibility hackathon – is a grass-root initiative by young scholars with the goal of improving research reproducibility in three ways: First, hackathon attendees learn about reproducibility tools and challenges by reproducing published results and providing feedback to authors on their attempt. Second, authors can nominate their own work and receive feedback on their reproducibility efforts. Third, the collaborative atmosphere at the event helps building an interdisciplinary community among researchers, who often lack such support in their own departments. A first ReproHack in the Netherlands took place on November 30th, 2019, co-organised by the CSD at the LU Library with 44 participants from the fields of psychology, engineering, biomedicine, and computer science, 3 had submitted their own work to the hackathon. From 19 papers with code and data, 24 feedback forms were filled, 5 papers were successfully reproduced and 6 where almost reproduced. Two speakers framed the event, the first one introducing participants to current developments on tools for reproducible research and the second one putting reproducibility into a broader context. The organizers aim to create resources to make the event format itself reproducible. ReproHack provides an opportunity for libraries to actively draw attention to and improve the reproducibility of science.
From paper records to research resource for health and social science
Creators: name: Lindie Tessmer Andersen
Publisher: name: Zenodo
Year: 2021

description: Denmark is one of the countries in the world with most population-based registrations and therefore many records, especially regarding health. Researchers often use these huge amounts of digital records for a range of health related research questions. The Danish National Archives have funding for providing a dedicated service for collection, preservation and dissemination of data from health science named DNA Health. Until recent years focus for DNA Health has been on born research data exclusively. However, what about the great amount of paper records with huge potential for health science purposes held by the Danish National Archives? A group of Danish health researchers approached the DNA Health with the question: "What about the paper records from the schools medical offices, how can these records become a research resource for us?" To comply with this question the DNA Health formed a proposal for a digitization project in close collaboration with the researchers. The aim of the project is to create a database for research purposes based on the paper records from 1909-2012 from the northern part of the area of Jutland, where both rural and urban areas were included. More than 8.000 paper records will be digitalized into a ready to use database for research purposes. The database includes variables such as Social Security Numbers; birth weight; height and weight measured every year during the child's school years; parents' employment at the time of the child's school entry; number of siblings, vaccinations registrations and date for each registration. An advisory board of researchers have ensured that the selected variables are in line with researchers' needs. By 1st of December 2019 more than 1.750 children's paper records from the school medical offices has been keyed in. The database is ready to use ultimo 2021.
Cosmon inflation
Creators: name: Wetterich, C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The cosmon field responsible for dynamical dark energy can induce an inflationary period in early cosmology. Details depend on dilatation symmetry breaking terms in its potential and kinetic term that are relevant only during early stages of the evolution of the universe. For a large range of parameters we find realistic primordial density fluctuations. As a particular example we discuss a model with almost static geometry in the Jordan frame for all epochs of cosmology. Here the cosmic evolution of the Hubble parameter is replaced by a variation of the Planck mass and particle masses. This model predicts a spectral index $n=0.97$ and a ratio for tensor to scalar fluctuations $r=0.13$.
description: extended parameter space, extended discussion of entropy production, 9 pages, no figures
From semi-Markov random evolutions to scattering transport and superdiffusion
Creators: name: Ricciuti, Costantino
name: Toaldo, Bruno
Publisher: name: arXiv
Year: 2020
Subjects: subject: Probability (math.PR)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 60K15, 60K40, 60G50, 35Q20

description: We here study random evolutions on Banach spaces, driven by a class of semi-Markov processes. The expectation (in the sense of Bochner) of such evolutions is shown to solve some abstract Cauchy problems. Further, the abstract telegraph (damped wave) equation is generalized to the case of semi-Markov perturbations. A special attention is devoted to semi-Markov models of scattering transport processes which can be represented through these evolutions. In particular, we consider random flights with infinite mean flight times which turn out to be governed by a semi-Markov generalization of a linear Boltzmann equation; their scaling limit is proved to converge to superdiffusive transport processes.