cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Entropy mode loops and cosmological correlations during perturbative reheating
Creators: name: Kaya, Ali
name: Kutluk, Emine Seyma
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Recently, it has been shown that during preheating the entropy modes circulating in the loops, which correspond to the inflaton decay products, meaningfully modify the cosmological correlation functions at superhorizon scales. In this paper, we determine the significance of the same effect when reheating occurs in the perturbative regime. In a typical two scalar field model, the magnitude of the loop corrections are shown to depend on several parameters like the background inflaton amplitude in the beginning of reheating, the inflaton decay rate and the inflaton mass. Although the loop contributions turn out to be small as compared to the preheating case, they still come out larger than the loop effects during inflation.
description: v2: 14 pages, 1 figure, revtex4-1, comments added, to appear in JCAP
Unraveling long-time quantum dynamics using flow equations
Creators: name: Thomson, S. J.
name: Eisert, J.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The study of many-body quantum dynamics in strongly-correlated systems is extremely challenging. To date few numerical methods exist which are capable of simulating the non-equilibrium dynamics of two-dimensional quantum systems, in part reflecting complexity theoretic obstructions. In this work, we present a new technique able to overcome this obstacle, by combining continuous unitary flow techniques with the newly developed method of scrambling transforms. We overcome the prejudice that approximately diagonalizing the Hamiltonian cannot lead to reliable predictions for relatively long times. To the contrary, we show that the method works well in both localized and delocalized phases, and makes reliable predictions for a number of quantities including infinite-temperature autocorrelation functions. We complement our findings with rigorous incremental bounds on the truncation error. This approach shows that in practice, the exploration of intermediate-scale time evolution may be more feasible than is commonly assumed, challenging near-term quantum simulators.
description: 7+8 pages; 5+4 figures
Multi-frame image restoration method for Luojia 1-01 night-light remote sensing images
Creators: name: Bu, Lijing
name: Xu, Zhenghui
name: Zhao, Ruishan
name: Zhang, Zhengpeng
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Space Science
subject: Medicine
subject: Cell Biology
subject: Physiology
subject: FOS: Biological sciences

description: To address blur and noise issues caused by airlight and atmospheric scattering in nighttime imaging environment, we proposed a multi-frame image restoration method. First, the Luojia 1–01 night-light image degradation model was derived. Thereafter, the APSF (Atmospheric Point Spread Function) for night-light images was estimated. Improved dark channel prior and sparse constraint models were used to eliminate effects ofairlight and atmospheric scattering. Finally, a multi-frame sparse constraint model was established to eliminate image noise. The results show the proposed method is effective as it can reduce the image blur phenomenon, suppress image noise, and improve image quality.
Model independent extraction of the proton magnetic radius from electron scattering
Creators: name: Epstein, Zachary
name: Paz, Gil
name: Roy, Joydeep
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We combine constraints from analyticity with experimental electron-proton scattering data to determine the proton magnetic radius without model-dependent assumptions on the shape of the form factor. We also study the impact of including electron-neutron scattering data, and $ππ\to N\bar{N}$ data. Using representative datasets we find for a cut of $Q^2\leq0.5$ GeV$^2$, $r_M^p=0.91^{+0.03}_{-0.06}\pm0.02$ fm using just proton scattering data; $r_M^p=0.87^{+0.04}_{-0.05}\pm0.01$ fm adding neutron data; and $r_M^p=0.87^{+0.02}_{-0.02}$ fm adding $ππ$ data. We also extract the neutron magnetic radius from these data sets obtaining $r_M^n=0.89^{+0.03}_{-0.03}$ fm from the combined proton, neutron, and $ππ$ data.
description: 21 pages, 2 figures
Additional file 1 of Presentation of breast cancer, help seeking behaviour and experience of patients in their cancer journey in Singapore: a qualitative study
Creators: name: Ng, Celene W. Q.
name: Lim, Jennifer N. W.
name: Liu, Jenny
name: Hartman, Mikael
Publisher: name: figshare
Year: 2020
Subjects: subject: Medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Cancer
subject: Science Policy
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Additional file 1.
Electron-ion heating partition in imbalanced solar-wind turbulence
Creators: name: Squire, Jonathan
name: Meyrand, Romain
name: Kunz, Matthew W.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Plasma Physics (physics.plasm-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: A likely candidate mechanism to heat the solar corona and solar wind is low-frequency "Alfvénic" turbulence sourced by magnetic fluctuations near the solar surface. Depending on its properties, such turbulence can heat different species via different mechanisms, and the comparison of theoretical predictions to observed temperatures, wind speeds, anisotropies, and their variation with heliocentric radius provides a sensitive test of this physics. Here we explore the importance of normalized cross helicity, or imbalance, for controlling solar-wind heating, since it is a key parameter of magnetized turbulence and varies systematically with wind speed and radius. Based on a hybrid-kinetic simulation in which the forcing's imbalance decreases with time -- a crude model for a plasma parcel entrained in the outflowing wind -- we demonstrate how significant changes to the turbulence and heating result from the "helicity barrier" effect. Its dissolution at low imbalance causes its characteristic features -- strong perpendicular ion heating with a steep "transition-range" drop in electromagnetic fluctuation spectra -- to disappear, driving more energy into electrons and parallel ion heat, and halting the emission of ion-scale waves. These predictions seem to agree with a diverse array of solar-wind observations, offering to explain a variety of complex correlations and features within a single theoretical framework.
description: 8 pages, 5 figures. Figure 4 updated from published version
Quark mass and mixing in the 3-3-1 model with neutral leptons based on $D_4$ flavor symmetry
Creators: name: Vien, V. V.
name: Long, H. N.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The $D_4$ flavor model based on $\mathrm{SU}(3)_C \otimes \mathrm{SU}(3)_L \otimes \mathrm{U}(1)_X$ gauge symmetry that aims at describing quark mass and mixing is updated. After spontaneous breaking of flavor symmetry, with the constraint on the Higgs vacuum expectation values (VEVs) in the Yukawa couplings, all of quarks have consistent masses, and a realistic quark mixing matrix can be realized at the first order of perturbation theory.
description: 14 pages
title: GIS-basierte, multikriterielle Eignungssanalyse für autarken Wohnraum in Österreich
Creators: name: Grindl, Christopher
Year: 2021

description: Bedingt durch die voranschreitende globale Umweltzerstörung, den hohen Verbrauch an Ressourcen und den einhergehenden Klimawandel ist aktuell ein Trend hin zu einer nachhaltigeren, minimalistischen Lebensweise zu beobachten. Dies wirkt sich auch auf den Wohnraum aus, und eine Vielzahl an Menschen entscheidet sich mittlerweile für sogenannte „Tiny Houses“, welche oftmals auch mobil sind. Die Fortführung dieser Idee sind autarke Kleinhäuser, welche durch den technischen Fortschritt größtenteils unabhängig („autark“) von öffentlichem Stromnetz, Wasser- und Kanalanschluss funktionieren können. Auch in Österreich ist diese Idee bereits angekommen, wie man an diversen erfolgreichen Projekten sehen kann. Die vorliegende Arbeit beschäftigt sich mit der örtlichen Eignung Österreichs für autarken Wohnraum. Dazu wurde eine multikriterielle Eignungsanalyse durchgeführt, in der verschiedene autarkierelevante Standortparameter bewertet, gewichtet und zu einem flächendeckenden Index zusammengefasst wurden. Nach einem vorangehenden Ausschlussverfahren ungeeigneter Standorte wurden diverse Kriterien für Flächen in Österreich in einer einheitlichen Skala bewertet. Die so standardisierten Einzelkriterien wurden daraufhin mittels der Methodik der gewichteten Überlagerung zu einem Autarkieindex zusammengefasst. Die Parametergewichtungen wurden durch Expertenumfragen ermittelt. Der so entstandene Index gibt die allgemeine relative Eignung eines jeden in Frage kommenden Standorts für autarke Wohnbauten an. Es konnte gezeigt werden, dass die Methodik der gewichteten Überlagerung geeignet ist, als Entscheidungsunterstützung bei multikriteriellen Eignungsanalysen für autarken Wohnraum eingesetzt zu werden. Die Analyse hat ergeben, dass etwa ein Viertel der Fläche Österreich hinsichtlich der untersuchten Parameter grundsätzlich für autarken Wohnraum in Frage kommt. Auffällig dabei ist, dass sich die Regionen mit der größten Eignung im Osten, Nordosten, Süden und Südwesten des Landes konzentrieren. Einzelne größere Alpentäler der Steiermark, Tirol und an der westlichen Grenze Vorarlbergs weisen ebenfalls größere geeignete Gebiete auf. In den Alpen selbst sind meist kleine bis mittelgroße, vereinzelte Flächen vertreten. Es lässt sich daraus schließen, dass im gesamten Bundesgebiet ein großes Potenzial zur Erschließung von Wohnraum besteht, welcher autark funktionieren und damit einen Beitrag zur Wiederherstellung nachhaltiger Wasser- und Nährstoffkreisläufe leisten kann.
Automorphisms and quotients of Calabi-Yau threefolds of type $A$
Creators: name: Monti, Martina
Publisher: name: arXiv
Year: 2023
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: The aim of the paper is to investigate the only two families $\mathcal{F}^A_{G}$ of Calabi-Yau $3$-folds $A/G$ with $A$ an abelian $3$-fold and $G\le \text{Aut}(A)$ a finite group acting freely: one in constructed by Catanese and Demleitner and the other is presented here. We provide a complete classification of the automorphism group of $X\in \mathcal{F}^A_{G}$. Additionally, we construct and classify the quotients $X/Υ$ for any $Υ\le \text{Aut}(X)$. Specifically, for those groups $Υ$ that preserve the volume form of $X$ then $X/Υ$ admits a desingularization $Y$ which is a Calabi-Yau $3$-fold: we compute the Hodge numbers and the fundamental group of these $Y$, thereby determining all topological in-equivalent Calabi-Yau $3$-folds obtained in this way.
description: Update of Proposition 9.12, in the last version there was an error
title: Hate Speech gegen Frauen - über sprachliche Gewalt im Internet
Creators: name: Embacher, Andrea
Year: 2021

description: Frauenfeindlichkeit im Internet ist in den letzten Jahren zu einem viel diskutierten Thema geworden, dennoch wird die Problematik in der öffentlichen Debatte immer noch verharmlost. Diese Arbeit befasst sich mit sexistischer und frauenfeindlicher Hate Speech im virtuellen Raum und verfolgt das Ziel, deren gewaltsamen Charakter sichtbar zu machen. Dabei werden auch die Folgen sowie der mögliche Umgang mit verletzenden und abwertenden Aussagen im Internet diskutiert. Um Hate Speech gegen Frauen zu definieren erfolgen im ersten Abschnitt eine Betrachtung verschiedener Begriffsbestimmungen sowie eine Verortung des Phänomens in einem größeren Zusammenhang. Die Rolle des Mediums Internet wird untersucht und festgestellt, dass einige Merkmale desselben das Ausmaß und die Auswirkungen der feindlichen Äußerungen beeinflussen. Auch die These, dass online Hate Speech Ausdruck frauenfeindlicher Einstellungen in der Gesellschaft ist sowie zur Aufrechterhaltung bestehender Machtverhältnisse beiträgt wird untersucht und gestützt. In einem zweiten Schritt wird Hate Speech als Form der sprachlichen Gewalt diskutiert, die schwerwiegende Folgen für Betroffene sowie die Gesellschaft haben kann. Dafür wird aufgezeigt, dass sowohl Sprache und Gewalt als auch Virtualität und Realität nicht voneinander getrennt werden können. Im dritten Teil der Arbeit wird der Umgang mit frauenfeindlicher Hate Speech thematisiert und gefragt, ob die verletzenden Aussagen durch das Recht auf freie Meinungsäußerung geschützt sein sollen, auch wenn sie zur Folge haben, dass Frauen in ihren Ausdrucksmöglichkeiten eingeschränkt werden. Als mögliche Reaktionen werden staatliche Regulierungen sowie die Gegenrede diskutiert. Dabei wird deutlich, dass es sich um eine komplexe Thematik handelt, für die keine eindeutige Lösung bestimmt werden kann.
21cm signal sensitivity to dark matter decay
Creators: name: Facchinetti, Gaétan
name: Lopez-Honorez, Laura
name: Qin, Yuxiang
name: Mesinger, Andrei
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The redshifted 21cm signal from the Cosmic Dawn is expected to provide unprecedented insights into early Universe astrophysics and cosmology. Here we explore how dark matter can heat the intergalactic medium before the first galaxies, leaving a distinctive imprint in the 21cm power spectrum. We provide the first dedicated Fisher matrix forecasts on the sensitivity of the Hydrogen Epoch of Reionization Array (HERA) telescope to dark matter decays. We show that with 1000 hours of observation, HERA has the potential to improve current cosmological constraints on the dark matter decay lifetime by up to three orders of magnitude. Even in extreme scenarios with strong X-ray emission from early-forming, metal-free galaxies, the bounds on the decay lifetime would be improved by up to two orders of magnitude. Overall, HERA shall improve on existing limits for dark matter masses below $2$ GeV$/c^2$ for decays into $e^+e^-$ and below few MeV$/c^2$ for decays into photons.
description: 34 pages, 12 figures. v2: published version with additional references and improved figures
Lévy walks
Creators: name: Zaburdaev, V.
name: Denisov, S.
name: Klafter, J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Random walk is a fundamental concept with applications ranging from quantum physics to econometrics. Remarkably, one specific model of random walks appears to be ubiquitous across many fields as a tool to analyze transport phenomena in which the dispersal process is faster than dictated by Brownian diffusion. The Lévy walk model combines two key features, the ability to generate anomalously fast diffusion and a finite velocity of a random walker. Recent results in optics, Hamiltonian chaos, cold atom dynamics, bio-physics, and behavioral science demonstrate that this particular type of random walks provides significant insight into complex transport phenomena. This review provides a self-consistent introduction to Lévy walks, surveys their existing applications, including latest advances, and outlines further perspectives.
description: 50 pages
Additional file 1 of Global scientific output trend for Akkermansia muciniphila research: a bibliometric and scientometric analysis
Creators: name: Hojat Dehghanbanadaki
name: Aazami, Hossein
name: Shahrbanoo Keshavarz Azizi Raftar
name: Ashrafian, Fatemeh
name: Hanieh-Sadat Ejtahed
name: Hashemi, Ehsan
name: Tavassol, Zahra Hoseini
name: Badi, Sara Ahmadi
name: Siadat, Seyed Davar
Publisher: name: figshare
Year: 2020
Subjects: subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Science Policy

description: Additional file 1: Table S1. The list of all diseases that have already been evaluated in the Akkermansia articles.
Détermination d’un indice de composition phytoplanctonique pigmentaire pour les eaux de la Manche et de l’Atlantique (DCE)
Creators: name: Lampert, Luis
name: Hernandez Farinas, Tania
Publisher: name: Agence Française pour la Biodiversité, Ifremer
Year: 2018
Subjects: MANCHE
ATLANTIQUE
DCE
HPLC
PHYTOPLANCTON
INDICE DE COMPOSITION
ICBC

description: La demande de la part de la Commission Européenne, pour inclure un Indice de Compositions (IC) dans l’indicateur « phytoplancton » de la Directive Cadre de l’Eau, a été prise en compte et un test en conditions réelle a été mené sur les données pigmentaires acquises entre 2016 et 2017. Deux échantillons par mois ont été analysés par chromatographie liquide (HPLC) sur 16 points, situés de la frontière belge et jusqu’au nord de la Loire. Cet indice (ICBC) a été bâti par la comparaison des moyennes pigmentaires de chaque point à une référence, via l’indice de similarité de Bray-Curtis. Cette référence (REF-Atl) a été définie comme la moyenne des deux points les moins impactées (Querqueville et Les Hébihens). La fréquence d’échantillonnage retenue est celle de la période productive dans ces eaux : de mars à octobre.
Une corrélation supérieure à 0.95 est obtenue entre l’indice ICBC et les pressions (nitrate plus nitrite, ammonium, phosphate, turbidité). Les mêmes valeurs de corrélation sont obtenues entre la chlorophylle totale et la somme des pigments biomarqueurs, ce qi permet de valider le modèle pigmentaire.
Une grille de classement est proposée sur la base des résultats obtenus.  A partir de l’ICBC calculé, est obtenu l’EQR IC qui doit être borné entre 0 et 1, comme c’est le cas pour tous les indices DCE. Nos résultats classent les masses d’eau échantillonnées dans un gradient très proche de celui obtenu avec les indices de biomasse et d’abondance.
A cet EQR IC est associé un intervalle de confiance, et au classement des masses d’eau, un niveau de confiance (%). Ces incertitudes sont calculées par bootstrap sur un rééchantillonnage de 1000 tirages aléatoires avec remise des valeurs brutes.
Data-Driven Batch Localization and SLAM Using Koopman Linearization
Creators: name: Guo, Zi Cong
name: Dümbgen, Frederike
name: Forbes, James R.
name: Barfoot, Timothy D.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: We present a framework for model-free batch localization and SLAM. We use lifting functions to map a control-affine system into a high-dimensional space, where both the process model and the measurement model are rendered bilinear. During training, we solve a least-squares problem using groundtruth data to compute the high-dimensional model matrices associated with the lifted system purely from data. At inference time, we solve for the unknown robot trajectory and landmarks through an optimization problem, where constraints are introduced to keep the solution on the manifold of the lifting functions. The problem is efficiently solved using a sequential quadratic program (SQP), where the complexity of an SQP iteration scales linearly with the number of timesteps. Our algorithms, called Reduced Constrained Koopman Linearization Localization (RCKL-Loc) and Reduced Constrained Koopman Linearization SLAM (RCKL-SLAM), are validated experimentally in simulation and on two datasets: one with an indoor mobile robot equipped with a laser rangefinder that measures range to cylindrical landmarks, and one on a golf cart equipped with RFID range sensors. We compare RCKL-Loc and RCKL-SLAM with classic model-based nonlinear batch estimation. While RCKL-Loc and RCKL-SLAM have similar performance compared to their model-based counterparts, they outperform the model-based approaches when the prior model is imperfect, showing the potential benefit of the proposed data-driven technique.
description: Note: the journal version for IEEE T-RO does not include Appendix G
Convergence of statistical moments of particle density time series in scrape-off layer plasmas
Creators: name: Kube, Ralph
name: Garcia, Odd Erik
Publisher: name: arXiv
Year: 2014
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Particle density fluctuations in the scrape-off layer of magnetically confined plasmas, as measured by gas-puff imaging or Langmuir probes, are modeled as the realization of a stochastic process in which a superposition of pulses with a fixed shape, an exponential distribution of waiting times and amplitudes represents the radial motion of blob-like structures. With an analytic formulation of the process at hand, we derive expressions for the mean-squared error on estimators of sample mean and sample variance as a function of sample length, sampling frequency, and the parameters of the stochastic process. % Employing that the probability distribution function of a particularly relevant shot noise process is given by the gamma distribution, we derive estimators for sample skewness and kurtosis, and expressions for the mean-squared error on these estimators. Numerically generated synthetic time series are used to verify the proposed estimators, the sample length dependency of their mean-squared errors, and their performance. We find that estimators for sample skewness and kurtosis based on the gamma distribution are more precise and more accurate than common estimators based on the method of moments.
description: 31 pages, 10 figures
Webinars sobre Buenas Prácticas en los Procesos Editoriales de Revistas Científicas para LILACS (2020) - Sesión IX - "Conócete a ti mismo: modelo de (auto) evaluación por enfoque de dominios: educación, información, comunicación, corresponsabilidad y anticipación"
Creators: name: BIREME/OPS/OMS
name: Reis, Juliana Gonçalves
name: Suga, Sueli Mitiko Yano
Publisher: name: Zenodo
Year: 2020
Subjects: Buenas prácticas
Ciencia aberta
Lilacs
Editores Lilacs
Revista Lilacs
Buenas Prácticas Editoriales

description: (09|09) "𝗖𝗼𝗻𝗼́𝗰𝗲𝘁𝗲 𝗮 𝘁𝗶 𝗺𝗶𝘀𝗺𝗼" Buenas Prácticas Editoriales LILACS 2020 • Sesión 09 | 18 de noviembre de 2020 • Tema: Conócete a ti mismo - Modelo de (auto) evaluación por enfoque de dominios: educación, información, comunicación, corresponsabilidad y anticipación • Ponente: Juliana Gonçalves Reis Más informaciones → https://lilacs.bvsalud.org/es/buenas-practicas-en-los-procesos-editoriales-de-revistas-cientificas-para-lilacs-2020/
SeaDataCloud Temperature and Salinity Historical Data Collection for the Arctic V1 (Version 1)
Creators: name: Sagen, Helge
name: Østensen, Øivind
name: Simoncelli, Simona
Publisher: name: SeaDataCloud
Year: 2018

description: The SeaDataCloud Temperature and Salinity Historical Data Collection for the Arctic Seas include open access in situ data on temperature and salinity for the period 1900 – 2017. The data were retrieved from the SeaDataNet infrastructure at the end of October 2017. The dataset format is ODV binary collections [1]. The quality control of the data has been performed with the help of ODV software. Data Quality Flags have been revised following common recommended procedures defined under SeaDataNet 2 project in conjunction with visual expert check.
Rescattering corrections and self-consistent metric in Planckian scattering
Creators: name: Ciafaloni, Marcello
name: Colferai, Dimitri
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Starting from the ACV approach to transplanckian scattering, we present a development of the reduced-action model in which the (improved) eikonal representation is able to describe particles' motion at large scattering angle and, furthermore, UV-safe (regular) rescattering solutions are found and incorporated in the metric. The resulting particles' shock-waves undergo calculable trajectory shifts and time delays during the scattering process --- which turns out to be consistently described by both action and metric, up to relative order $R^2/b^2$ in the gravitational radius over impact parameter expansion. Some suggestions about the role and the (re)scattering properties of irregular solutions --- not fully investigated here --- are also presented.
description: 39 pages, 14 figures
Interaction quench in the Holstein model: Thermalization crossover from electron- to phonon-dominated relaxation
Creators: name: Murakami, Yuta
name: Werner, Philipp
name: Tsuji, Naoto
name: Aoki, Hideo
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the relaxation of the Holstein model after a sudden switch-on of the interaction by means of the nonequilibrium dynamical mean field theory, with the self-consistent Migdal approximation as an impurity solver. We show that there exists a qualitative change in the thermalization dynamics as the interaction is varied in the weak-coupling regime. On the weaker interaction side of this crossover, the phonon oscillations are damped more rapidly than the electron thermalization timescale, as determined from the relaxation of the electron momentum distribution function. On the stronger interaction side, the relaxation of the electrons becomes faster than the phonon damping. In this regime, despite long-lived phonon oscillations, a thermalized momentum distribution is realized temporarily. The origin of the thermalization crossover found here is traced back to different behaviors of the electron and phonon self-energies as a function of the electron-phonon coupling. In addition, the importance of the phonon dynamics is demonstrated by comparing the self-consistent Migdal results with those obtained with a simpler Hatree-Fock impurity solver that neglects the phonon self-energy. The latter scheme does not properly describe the evolution and thermalization of isolated electron-phonon systems.
description: 13 pages, 11 figures, minor changes
Quantum Data Center: Perspectives
Creators: name: Liu, Junyu
name: Jiang, Liang
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Artificial Intelligence (cs.AI)
subject: Emerging Technologies (cs.ET)
subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: A quantum version of data centers might be significant in the quantum era. In this paper, we introduce Quantum Data Center (QDC), a quantum version of existing classical data centers, with a specific emphasis on combining Quantum Random Access Memory (QRAM) and quantum networks. We argue that QDC will provide significant benefits to customers in terms of efficiency, security, and precision, and will be helpful for quantum computing, communication, and sensing. We investigate potential scientific and business opportunities along this novel research direction through hardware realization and possible specific applications. We show the possible impacts of QDCs in business and science, especially the machine learning and big data industries.
description: 9 pages, many figures. This is a perspective papers introducing the ideas and impacts of quantum data centers in arXiv:2207.14336
GTSPP data management report 2017. Coriolis DAC
Creators: name: Carval, Thierry
name: Petit De La Villeon, Loic
Publisher: name: Ifremer
Year: 2018

description: This is the Coriolis data center report on GTSPP activities for year 2017. Between January 2017 and December 2017, 37412 new profiles from 171 platforms where collected, controlled and distributed.
Revisiting the screening mechanism in $f(R)$ gravity
Creators: name: He, Jian-hua
name: Li, Baojiu
name: Hawken, Adam J.
name: Granett, Benjamin R.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We reexamine the screening mechanism in $f(R)$ gravity using N-body simulations. By explicitly examining the relation between the extra scalar field $δf_R$ and the gravitational potential $ϕ$ in the perturbed Universe, we find that the relation between these two fields plays an important role in understanding the screening mechanism. We show that the screening mechanism in $f(R)$ gravity depends mainly on the depth of the potential well, and find a useful condition for identifying unscreened halos in simulations. We also discuss the potential application of our results to real galaxy surveys.
description: 16 pages, 13 figures, revised version, accepted for publication in PRD
Emotion regulation and prejudice reduction
Creators: name: Johnston, Brian
Publisher: name: No Publisher Supplied
Year: 2010

description: Prejudice is a problem that can be found in most places around the world. Problems that have arisen in the past as a result of prejudice include hate crimes, unjust social policies / acts, and even genocide. Past research has noted associations amongst negative affect and prejudice (Tropp & Pettigrew, 2004). In particular, studies have found a relationship between anger and racial prejudice (Roseman, Copeland, & Fischer, 2003; Walker & Smith, 2001), thus leading to the possibility of utilizing emotion regulation techniques to decrease racist emotions. This study aimed to discover if different emotion regulation strategies differentially affect prejudice. The study focused on racial prejudice and sexual orientation prejudice. Cognitive reappraisal and suppression of anger toward a black couple in a vignette were manipulated. Both racial and sexual orientation prejudice were measured implicitly and explicitly. Correlational findings indicated that cognitive reappraisal (of emotions in general) may decrease explicit racial prejudice for white participants, while suppression of anger specifically (especially by black participants) may increase racial prejudice against blacks. Particularly for white participants, it was found that one's level of anger during the time of the study was associated with greater explicit racial prejudice; and that one's level of anxiety at the time of the study was associated with greater implicit and explicit racial prejudice. Additionally, for black participants, a disposition to anger was related to greater explicit racial prejudice against blacks, while a disposition to anxiety was related to greater implicit racial prejudice against blacks. For sexual orientation prejudice, cognitive reappraisal was associated with lower implicit prejudice (for white participants) and suppression was associated with higher explicit prejudice (especially for white participants). It was found that anger (and regulation of that anger) is related to racial prejudice, but not sexual orientation prejudice. Differentiations between racial and sexual orientation prejudice were examined and preliminary evidence was exhibited for disgust having a positive relationship with sexual orientation prejudice.
On Conway's potential function for colored links
Creators: name: Jiang, Boju
Publisher: name: arXiv
Year: 2014
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: Primary 57M25, Secondary 20F36

description: The Conway potential function (CPF) for colored links is a convenient version of the multi-variable Alexander-Conway polynomial. We give a skein characterization of CPF, much simpler than the one by Murakami. In particular, Conway's `smoothing of crossings' is not in the axioms. The proof uses a reduction scheme in a twisted group-algebra $\mathbb P_nB_n$, where $B_n$ is a braid group and $\mathbb P_n$ is a domain of multi-variable rational fractions. The proof does not use computer algebra tools. An interesting by-product is a characterization of the Alexander-Conway polynomial of knots.
Charge order above room-temperature in a prototypical kagome superconductor La(Ru$_{1-x}$Fe$_{x}$)$_{3}$Si$_{2}$
Creators: name: Plokhikh, I.
name: Mielke, C.
name: Nakamura, H.
name: Petricek, V.
name: Qin, Y.
name: Sazgari, V.
name: Küspert, J.
name: Bialo, I.
name: Shin, S.
name: Ivashko, O.
name: Zimmermann, M. v.
name: Medarde, M.
name: Amato, A.
name: Khasanov, R.
name: Luetkens, H.
name: Fischer, M. H.
name: Hasan, M. Z.
name: Yin, J. -X.
name: Neupert, T.
name: Chang, J.
name: Xu, G.
name: Nakatsuji, S.
name: Pomjakushina, E.
name: Gawryluk, D. J.
name: Guguchia, Z.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The kagome lattice is an intriguing and rich platform for discovering, tuning and understanding the diverse phases of quantum matter, which is a necessary premise for utilizing quantum materials in all areas of modern and future electronics in a controlled and optimal way. The system LaRu$_{3}$Si$_{2}$ was shown to exhibit typical kagome band structure features near the Fermi energy formed by the Ru-$dz^{2}$ orbitals and the highest superconducting transition temperature $T_{\rm c}$ ${\simeq}$ 7K among the kagome-lattice materials. However, the effect of electronic correlations on the normal state properties remains elusive. Here, we report the discovery of charge order in La(Ru$_{1-x}$Fe$_{x}$)$_{3}$Si$_{2}$ ($x$ = 0, 0.01, 0.05) beyond room-temperature. Namely, single crystal X-ray diffraction reveals charge order with a propagation vector of ($\frac{1}{4}$,0,0) below $T_{\rm CO-I}$ ${\simeq}$ 400K in all three compounds. At lower temperatures, we see the appearance of a second set of charge order peaks with a propagation vector of ($\frac{1}{6}$,0,0). The introduction of Fe, which is known to quickly suppress superconductivity, does not drastically alter the onset temperature for charge order. Instead, it broadens the scattered intensity such that diffuse scattering appears at the same onset temperature, however does not coalesce into sharp Bragg diffraction peaks until much lower in temperature. Our results present the first example of a charge ordered state at or above room temperature in the correlated kagome lattice with bulk superconductivity.
description: 15 pages, 8 figures
Resource-efficient photonic quantum computation with high-dimensional cluster states
Creators: name: Lib, Ohad
name: Bromberg, Yaron
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Quantum computers can revolutionize science and technology, but their realization remains challenging across all platforms. A promising route to scalability is photonic measurement-based quantum computation, where single-qubit measurements on large cluster states, together with feedforward, enable fault-tolerant quantum computation. However, generating large cluster states at high rates is notoriously difficult, as detection probabilities drop exponentially with the number of photons comprising the state. We tackle this challenge by encoding multiple qubits on each photon through high-dimensional spatial encoding, generating cluster states with over nine qubits at a rate of 100Hz. Additionally, we demonstrate that high-dimensional encoding substantially reduces the computation duration by enabling instantaneous feedforward between qubits encoded in the same photon. Our findings pave the way for resource-efficient measurement-based quantum computation using high-dimensional entanglement.
description: Nat. Photon. (2024)
On the implications of the Galactic aberration in proper motions for celestial reference frame
Creators: name: Malkin, Zinovy
Publisher: name: arXiv
Year: 2014
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: During the last years, much attention has been paid to the astrometric implications of the galactic aberration in proper motions (GA). This effect causes systematic errors in astrometric measurements at a microarcsecond level. Some authors consider it so serious that it requires redefinition of the celestial reference system (CRF). We argue that such attention to the GA is too much exaggerated. It is just a small astrometric correction that must be taken into account during highly accurate astrometric and geodetic data processing. The accuracy of this correction depends on accuracy of the Galactic rotation parameters and, for most application, on the accuracy of the rotation matrix between Galactic and equatorial systems. Our analysis has shown that our today knowledge of these two factors is sufficient to compute the GA correction with accuracy of better than 10%. The remaining effect at a level of few tenths microarcsecond/yr is negligible nowadays. Another consequence of introducing the GA correction is necessity to return to classical astrometric modeling of the VLBI-derived extragalactic radio source position by the linear trend model. Changing the current paradigm of VLBI-derived CRF based on assumption of zero motion of radio sources to classical one leads to bias in the radio source positions up to several tens microarcseconds for catalog at epoch J2000.0.
description: Original paper published in MNRAS is extended with an erratum, which will soon appear in MNRAS. The results and conclusions of the original paper are not affected
Probing the spatial and velocity anisotropies in stellar halos from the Aquarius simulations
Creators: name: Mondal, Amit
name: Pandey, Biswajit
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We analyze the spatial anisotropy and the velocity anisotropy in a set of mock stellar halos from the Aquarius simulations. The spatial anisotropy in each mock stellar halo rises progressively with the increasing distance from the halo centre, eventually reaching a maximum near the periphery. Excluding the bound satellites leads to a significant reduction of the spatial anisotropy in each halo. We compare the measured anisotropy in the mock stellar halos with that from their sphericalized versions where all the shape and substructure induced anisotropies are erased. The growth of spatial anisotropy persists throughout the entire halo when the bound satellites are present but remains limited within the inner halo ($<60 \, h^{-1}\, {\rm kpc}$) after their exclusion. This indicates that the spatial anisotropy in the inner halo is induced by the diffuse substructures and the halo shape whereas the outer halo anisotropy is dominated by the bound satellites. We find that the outer parts of the stellar halo are kinematically colder than the inner regions. The stellar orbits are predominantly radial but they become rotationally dominated at certain radii that are marked by the prominent dips in the velocity anisotropy. Most of these dips disappear after the removal of the satellites. A few shallow dips arise occasionally due to the presence of diffuse streams and clouds. Our analysis suggests that a combined study of the spatial and velocity anisotropies can reveal the structure and the assembly history of the stellar halos.
description: 18 pages, 14 figures, significantly revised and expanded, Accepted for publication in MNRAS
Bethe ansatz solutions and hidden $sl(2)$ algebraic structure for a class of quasi-exactly solvable systems
Creators: name: Li, Siyu
name: Marquette, Ian
name: Zhang, Yao-Zhong
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The construction of analytic solutions for quasi-exactly solvable systems is an interesting problem. We revisit a class of models for which the odd solutions were largely missed previously in the literature: the anharmonic oscillator, the singular anharmonic oscillator, the generalized quantum isotonic oscillator, non-polynomially deformed oscillator, and the Schrödinger system from the kink stability analysis of $ϕ^6$-type field theory. We present a systematic and unified treatment for the odd and even sectors of these models. We find generic closed-form expressions for constraints to the allowed model parameters for quasi-exact solvability, the corresponding energies and wavefunctions. We also make progress in the analysis of solutions to the Bethe ansatz equations in the spaces of model parameters and provide insight into the curves/surfaces of the allowed parameters in the parameter spaces. Most previous analyses in this aspect were on a case-by-case basis and restricted to the first excited states. We present analysis of the solutions (i.e. roots) of the Bethe ansatz equations for higher excited states (up to levels $n$=30 or 50). The shapes of the root distributions change drastically across different regions of model parameters, illustrating phenomena analogous to phase transition in context of integrable models. Furthermore, we also obtain the $sl(2)$ algebraization for the class of models in their respective even and odd sectors in a unified way.
On Recent Claims Concerning the R_h=ct Universe
Creators: name: Melia, Fulvio
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The R_h=ct Universe is a Friedmann-Robertson-Walker (FRW) cosmology which, like LCDM, assumes the presence of dark energy in addition to (baryonic and non-luminous) matter and radiation. Unlike LCDM, however, it is also constrained by the equation of state (EOS) p=-rho/3, in terms of the total pressure p and energy density rho. One-on-one comparative tests between R_h=ct and LCDM have been carried out using over 14 different cosmological measurements and observations. In every case, the data have favoured R_h=ct over the standard model, with model selection tools yielding a likelihood ~90-95% that the former is correct, versus only ~5-10% for the latter. In other words, the standard model without the EOS p=-rho/3 does not appear to be the optimal description of nature. Yet in spite of these successes---or perhaps because of them---several concerns have been published recently regarding the fundamental basis of the theory itself. The latest paper on this subject even claims---quite remarkably---that R_h=ct is a vacuum solution, though quite evidently rho is not 0. Here, we address these concerns and demonstrate that all criticisms leveled thus far against R_h=ct, including the supposed vacuum condition, are unwarranted. They all appear to be based on incorrect assumptions or basic theoretical errors. Nevertheless, continued scrutiny such as this will be critical to establishing R_h=ct as the correct description of nature.
description: 9 pages (0 figures). Accepted for publication in MNRAS
title: Individuelle und kollektive Formen von (wahrgenommener) Handlungsmacht in der transnationalen 24-Stunden-Betreuung während der Corona-Krise
Creators: name: Florian, Johanna
Year: 2021

description: Die Auslagerung von Sorgearbeit auf transnationale Sorgearbeiter*innen ist ein weltweites Phänomen, dass globale Ungleichheiten offenbart und reproduziert. Transnationale Live-in- Sorgearbeit, wie die 24-Stunden-Betreuung in Österreich, ist in intersektionale Machtverhältnisse eingebettet und geprägt von prekären Arbeitsbedingungen und komplexen Abhängigkeitsverhältnissen. Die Corona-Krise hat die Arbeitsbedingungen in der 24-Stunden-Betreuung noch weiter verschärft. Diese Arbeit stellt sich die Frage, wie sich die Handlungsspielräume von 24-Stunden-Betreuer*innen während der Corona-Krise verändert haben und wie 24-Stunden-Betreuer*innen ihre Handlungsmacht während dieser Zeit selbst wahrgenommen haben. Qualitative offene Interviews mit transnationalen 24-Stunden- Betreuer*innen in Österreich haben unter anderem gezeigt, dass sich die interviewten Personen aufgrund der geringen kollektiven Organisationsmöglichkeiten im Sektor vor allem abhängig von ihrer individuellen (Ver)handlungsmacht fühlen. Die Perspektive auf Handlungsmacht im Arbeitskontext (labor agency) sollte aus diesem Grund ausgeweitet werden, um Handlungsmacht in spezifischen Kontexten wie der 24-Stunden-Betreuung in Österreich während der Corona-Krise analysieren zu können.
description: The outsourcing of care work is a worldwide phenomenon that reveals and reproduces global inequalities. Most of this work is outsourced to migrant women from economically poorer countries. In this context, transnational live-in care work is one of the most precarious forms of work. Transnational live-in care work in Austria is embedded in intersectional power relations and is defined by complex dependencies and vulnerabilities. The agency of these workers is restrained by the conditions and complex power relations in these workplaces. During the coronavirus pandemic, these restraints were amplified. This work tries to answer the question, how the pandemic changed the conditions of agency of live-in care workers in Austria and how they perceived their own agency in their working contexts. Qualitative open interviews with live-in care workers in Austria have shown that because of the lack of collective organization in the sector, live-in care workers see themselves as highly dependent on their own individual agency. Consequently, the perspective on labour agency has to be adapted in order to analyze agency in specific constrained contexts like live-in care work in Austria during the pandemic.
Lorient Flume tank
Creators: name: Vincent, Benoit
name: Simon, Julien
name: Vacherot, Jean-Philippe
name: Morandeau, Fabien
name: Larnaud, Pascal
name: Kopp, Dorothee
name: Mehault, Sonia
name: Morfin, Marie
name: Savina-Rolland, Marie
name: Marc, Emilie
Publisher: name: Ifremer
Year: 2018

description: The Lorient flume tank is an hydrodynamic facility available for any qualification and observation of submerged objects in still or moving water. It is a closed loop circulating tank filled with fresh water.  The fluid is moved with a 70 kW pump-motor with a velocity between 0 and 1 m/s and homogenized with a series of pressure drop systems.
The overall dimensions are 24.50 m long, 7.50m wide and 3.30 m high. The part where experiments can be set up is 12m long, 2.6 m wide and 1.5 m deep.  A mobile bottom belt can be synchronized with the water flow velocity and enables to simulate the seabed velocity relatively to a towed object. The overall process of the facility is controlled by a user friendly interface.
Generalization of the ABC theorem on locally nilpotent derivations
Creators: name: Kikteva, Veronika
Publisher: name: arXiv
Year: 2023
Subjects: subject: Algebraic Geometry (math.AG)
subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: 13N15, 13A50

description: We obtain a generalization of the ABC Theorem on locally nilpotent derivations to the case of the polynomials with m monomials such that each variable is included just in one monomial. As applications of this result we provide some construction of rigid and semi-rigid algebras and describe the Makar-Limanov invariant of algebras of a special form.