cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Thermodynamic phase transition in the rainbow Schwarzschild black hole
Creators: name: Gim, Yongwan
name: Kim, Wontae
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the thermodynamic phase transition in the rainbow Schwarzschild black hole where the metric depends on the energy of the test particle. Identifying the black hole temperature with the energy from the modified dispersion relation, we obtain the modified entropy and thermodynamic energy along with the modified local temperature in the cavity to provide well defined black hole states. It is found that apart from the conventional critical temperature related to Hawking-Page phase transition there appears an additional critical temperature which is of relevance to the existence of a locally stable tiny black hole; however, the off-shell free energy tells us that this black hole should eventually tunnel into the stable large black hole. Finally, we discuss the reason why the temperature near the horizon is finite in the rainbow black hole by employing the running gravitational coupling constant, whereas it is divergent near the horizon in the ordinary Schwarzschild black hole.
description: 14pages, 6figures, version to appear in JCAP
Work-Related Voice Disorder in Teachers of Basic Education: scoping review
Creators: name: Rayenne Ornelas De Souza
name: De Oliveira Silva, Bruna
name: De Castro Corrêa, Camila
name: Bastos, Giovanna Saboia
name: Quézia Teixeira Dias
name: Siqueira, Larissa Thais Donalonso
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Medicine and Health Sciences

description: Dysphonia is being studied, which can be described as any type of vocal alteration that prevents the voice from fulfilling its role in communication. Specifically, dysphonia related to the work environment in elementary school teachers is being studied. This population is more prone to risk factors, such as needing to speak loudly, inappropriate work environment, long working hours and stressors (psychological factors)
Critical quasienergy states in driven many-body systems
Creators: name: Bastidas, Victor Manuel
name: Engelhardt, Georg
name: Perez-Fernandez, Pedro
name: Vogl, Malte
name: Brandes, Tobias
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We discuss singularities in the spectrum of driven many-body spin systems. In contrast to undriven models, the driving allows us to control the geometry of the quasienergy landscape. As a consequence, one can engineer singularities in the density of quasienergy states by tuning an external control. We show that the density of levels exhibits logarithmic divergences at the saddle points, while jumps are due to local minima of the quasienergy landscape. We discuss the characteristic signatures of these divergences in observables like the magnetization, which should be measurable with current technology.
description: 10 pages, 4 figures, comments welcome
title: Controlling im Bauprojekt
title: Eine qualitative Analyse zur Identifizierung von Erfolgsfaktoren
titleType: Subtitle
Creators: name: Hohnholz, Kim-Malin
Publisher: name: FH Vorarlberg (Fachhochschule Vorarlberg)
Year: 2022
Subjects: subject: 330 Wirtschaft

description: Berühmte Beispiele zeigen, dass Bauprojekte Schwierigkeiten haben, im geplanten Zeit- und Kostenrahmen realisiert zu werden. Diese spezielle Art der Projekte ist individuellen Heraus- forderungen und Risiken ausgesetzt. Dem Controlling kommt im Bauprojekt eine besondere Bedeutung zu, da es helfen kann, diesen Herausforderungen zu begegnen. Das Controlling kann das Projektmanagement dabei unterstützen, die gesetzten Ziele zu erreichen und die Transparenz im Bauprojekt zu erhöhen. Mithilfe der vorliegenden Arbeit wird versucht, Erfolgsfaktoren für das Controlling in Baupro- jekten zu identifizieren. Um diese Forschungsfrage zu beantworten, wurden leitfadengestützte Interviews mit 15 Beschäftigten von im Bauprojekt beteiligten Berufsgruppen geführt (3 Archi- tekt/-innen, 3 Fachplaner/-innen, 3 Bauunternehmer/-innen sowie 6 Projektleiter/-innen). Die Interviews decken die folgenden Bereiche ab: Herausforderungen von Bauprojekten, Projekt- controlling, Risikomanagement und Erfolgsfaktoren.
Group Minds and the Case of Wikipedia
Creators: name: DeDeo, Simon
Publisher: name: arXiv
Year: 2014
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: Computer Science and Game Theory (cs.GT)
subject: Social and Information Networks (cs.SI)
subject: Physics and Society (physics.soc-ph)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Biological sciences
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Group-level cognitive states are widely observed in human social systems, but their discussion is often ruled out a priori in quantitative approaches. In this paper, we show how reference to the irreducible mental states and psychological dynamics of a group is necessary to make sense of large scale social phenomena. We introduce the problem of mental boundaries by reference to a classic problem in the evolution of cooperation. We then provide an explicit quantitative example drawn from ongoing work on cooperation and conflict among Wikipedia editors, showing how some, but not all, effects of individual experience persist in the aggregate. We show the limitations of methodological individualism, and the substantial benefits that come from being able to refer to collective intentions, and attributions of cognitive states of the form "what the group believes" and "what the group values".
description: 21 pages, 6 figures; matches published version
The halo bias for number counts on the light cone from relativistic N-body simulations
Creators: name: Lepori, Francesca
name: Schulz, Sebastian
name: Adamek, Julian
name: Durrer, Ruth
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present the halo number counts and its two-point statistics, the observable angular power spectrum, extracted for the first time from relativistic N-body simulations. The halo catalogues used in this work are built from the relativistic N-body code gevolution, and the observed redshift and angular positions of the sources are computed using a non-perturbative ray-tracing method, which includes all relativistic scalar contributions to the number counts. We investigate the validity and limitations of the linear bias prescription to describe our simulated power spectra. In particular, we assess the consistency of different bias measurements on large scales, and we estimate up to which scales a linear bias is accurate in modelling the data, within the statistical errors. We then test a second-order perturbative bias expansion for the angular statistics, on a range of redshifts and scales previously unexplored in this context, that is $0.4 \le \bar{z} \le 2$ up to scales $\ell_\mathrm{max} \sim 1000$. We find that the angular power spectra at equal redshift can be modelled with high accuracy with a minimal extension of the number of bias parameters, that is using a two-parameter model comprising linear bias and tidal bias. We show that this model performs significantly better than a model without tidal bias but with quadratic bias as extra degree of freedom, and that the latter is inaccurate at $\bar{z} \ge 0.7$. Finally, we extract from our simulations the cross-correlation of halo number counts and lensing convergence. We show that the estimate of the linear bias from this cross-correlation is consistent with the measurements based on the clustering statistics alone, and that it is crucial to take into account the effect of magnification in the halo number counts to avoid systematic shifts in the computed bias.
description: 28 pages, 16 figures
Graphdiyne based membranes: exceptional performances for helium separation applications
Creators: name: Bartolomei, Massimiliano
name: Carmona-Novillo, Estela
name: Hernández, Marta I.
name: Campos-Martínez, José
name: Pirani, Fernando
name: Giorgi, Giacomo
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Graphdiyne is a novel two-dimensional material deriving from graphene that has been recently synthesized and featuring uniformly distributed sub-nanometer pores. We report accurate calculations showing that graphdiyne pores permit an almost unimpeded helium transport which can be used for its chemical and isotopic separation. Exceptionally high He/CH_4 selectivities are found which largely exceed the performance of the best membranes used to date for extraction from natural gas. Moreover, by exploiting slight differences in the tunneling probabilities of ^3He and ^4He, we also find promising results for the separation of the Fermionic isotope at low temperature.
Cross effects in spin hydrodynamics: A revisit Entropy analysis and statistical operator
Creators: name: Hu, Jin
Publisher: name: arXiv
Year: 2022
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We revisit the construction of first-order spin hydrodynamics and find that the constitution relations receive the corrections from the cross effects resulting from spin-orbit coupling. Starting from a routine entropy analysis, we show how to identify cross effects and new cross transport coefficients from the second law of thermodynamics. Interestingly, the conventional transport coefficient heat conductivity $κ$ is bounded from below by the product of cross transport coefficients, which means the threshold of heat conduction is changed. With recourse to Zubarev's non-equilibrium statistical operator, we reproduce the construction of first-order spin hydrodynamics and identification of cross effects in a more rigorous way. By seeking the dispersion relations of normal modes, we find that these cross effects suppress the attenuation of sound modes and heat mode appearing in conventional hydrodynamics and also have impacts on the damping of non-hydrodynamic spin modes.
description: The version published in PRC
Two-Higgs-Doublet Type-II Seesaw Model
Creators: name: Chen, Chuan-Hung
name: Nomura, Takaaki
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Motivated by the new observed scalar boson of 126 GeV at ATLAS and CMS, various phenomena in two-Higgs-doublet model (THDM) are investigated broadly in the literature. For considering the model that possesses a solution to the massive neutrinos, we study the simplest extension of conventional type-II seesaw model to two Higgs doublets. We find that the new interactions in the scalar potential cause the sizable mixture of charged Higgses in triplet and doublet. As a result, we have a completely different decay pattern for doubly charged Higgs ($δ^{\pm\pm}$), even the vacuum expectation value (VEV) of Higgs triplet is at GeV level, which is limited by the precision measurement for $ρ$-parameter. For illustrating the new characters of the model, we study the influence of new interactions on the new open channels $δ^{++}\to ( H^+_1 W^{+^{(*)}}, H^+_1 H^+_1)$ with $H^+_1$ being the lightest charged Higgs. Additionally, due to the new mixing effect, the triplet charged Higgs could couple to quarks in the model; therefore, the search for $δ^{++}$ via $δ^{++}\to tb W^+ \to b \bar b W^+ W^+$ by mediated $H^+_{1}$ becomes significant.
description: 18 pages, 8 figures, Version to appear in PRD
Combining power spectrum and bispectrum measurements to detect oscillatory features
Creators: name: Fergusson, J. R.
name: Gruetjen, H. F.
name: Shellard, E. P. S.
name: Liguori, M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The simplest inflationary models present us with few observable parameters to discriminate between them. A detection of features in the spectra of primordial density perturbations could provide valuable insights and lead to stringent tests of models of the early Universe. So far, searches for oscillatory features have not produced statistically significant results. In this work we consider a combined search for features in the power spectrum and bispectrum. We show that possible dependencies between the estimates of feature model amplitudes based on the two- and three-point correlators are largely statistically independent under the assumption of the null hypothesis of a nearly Gaussian featureless CMB. Building on this conclusion we propose an optimal amplitude estimator for a combined search and study the look-elsewhere effect in feature model surveys. In particular we construct analytic models for the distribution of amplitude estimates that allow for a reliable assessment of the significance of potential findings. We also propose a well-behaved integrated statistic that is designed to detect evidence for models exhibiting features at multiple frequencies.
description: v1: 20 pages, 14 figures; v2: references added, typos corrected, minor changes in introduction; v3: minor changes to match the published version
title: Offene Lernformen für (neu)zugewanderte Jugendliche und junge Erwachsene aus der Sicht der Lehrenden
Creators: name: Urgazieva, Venera
Year: 2021

description: Diese Arbeit beschäftigt sich mit den Offenen Lernformen in einer schulanalogen Bildungseinrichtung für (neu)zugewanderte Jugendliche und junge Erwachsene aus der Lehrendenperspektive. Die Institution kann als eine Brücke zwischen einer Schule und weiterbildenden (Beruf)Schule gesehen werden. Hier strebt die Zielgruppe einen Pflichtschulabschluss zu erlangen und in eine Lehre vermittelt zu werden. Die Erfahrungen der Lehrenden werden mithilfe qualitativen Forschungsmethoden untersucht. Die Kombination von Befragung in Form von problemzentriertem Interview und Unterrichtsbeobachtung liefert ein umfassendes Bild: es werden sowohl die Außen- als auch die Binnenperspektive der Lehrenden berücksichtigt. Im Mittelpunkt der Beobachtungen steht kein DaZ-Unterricht als solches, sondern die Offenen Lernformen, welche in der schulanalogen Bildungseinrichtung im Lehrplan angeführt sind. Da die Lernende in anderen Lernkulturen bzw. Bildungssystemen sozialisiert wurden und dementsprechend unterschiedliche Lernbiographien aufweisen, wird gefragt, welche Schwierigkeiten und Herausforderungen entstehen können, wenn Lernende selbstbestimmt lernen sollen. Darüber hinaus werden Gemeinsamkeiten zwischen Lernkultur und Habitus Konzept von Pierre Bourdieu erläutert.
X-ray line in Radiative Neutrino Model with Global $U(1)$ Symmetry
Creators: name: Okada, Hiroshi
name: Orikasa, Yuta
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study a three loop induced radiative neutrino model with global $U(1)$ symmetry at TeV scale, in which we consider two component dark matter particles. We discuss the possibility to explain the X-ray line signal at about 3.55 keV recently reported by XMN-Newton X-ray observatory using data of various galaxy clusters and Andromeda galaxy. Subsequently, we also discuss to show that sizable muon anomalous magnetic moment, a discrepancy of the effective number of neutrino species $ΔN_{\rm eff}\approx$ 0.39, and scattering cross section detected by direct detection searches can be derived.
description: 14 pages, 3 figures, 1 table; version accepted for publication in Physical Review D
Evolution TANN and the identification of internal variables and evolution equations in solid mechanics
Creators: name: Masi, Filippo
name: Stefanou, Ioannis
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Data-driven and deep learning approaches have demonstrated to have the potential of replacing classical constitutive models for complex materials. Yet, the necessity of structuring constitutive models with an incremental formulation has given rise to data-driven approaches where physical quantities, e.g. deformation, blend with artificial, non-physical ones, such as the increments in deformation and time. Neural networks and the consequent constitutive models depend, thus, on the particular incremental formulation, fail in identifying material representations locally in time, and suffer from poor generalization. Herein, we propose a new approach which allows, for the first time, to decouple the material representation from the incremental formulation. Inspired by the Thermodynamics-based Artificial Neural Networks (TANN) and the theory of the internal variables, the evolution TANN (eTANN) are continuous-time and, therefore, independent of the aforementioned artificial quantities. Key feature of the proposed approach is the identification of the evolution equations of the internal variables in the form of ordinary differential equations, rather than in an incremental discrete-time form. In this work, we focus attention to juxtapose and show how the various general notions of solid mechanics are implemented in eTANN. The capabilities as well as the scalability of the proposed approach are demonstrated through several applications involving a broad spectrum of complex material behaviors, from plasticity to damage and viscosity (and combination of them). Finally, we show that the proposed approach can be used to speed-up multiscale analyses, by virtue of asymptotic homogenization. eTANN provide excellent results compared to detailed fine-scale simulations and offer the possibility not only to describe the average macroscopic material behavior, but also micromechanical, complex mechanisms.
DataCite: now and in the future
Creators: name: Buys, Matt
Publisher: name: Zenodo
Year: 2022
Subjects: DataCite Member Meeting 2022
strategic plan

description: The session looked at what we have accomplished in relation to our strategic plan and look ahead to the coming years. Attendees were be able to interact and provide feedback during the session via polling, chat, and Q&A. Speaker: Matt Buys (Executive Director, DataCite) A recording of the presentation can be found at: https://youtu.be/D2jRHAsRt10 Multi-language versions are be available: DataCite: agora e no futuro: https://youtu.be/WswcIAeK5aY DataCite 现在与未来科研互联,发现新知: https://youtu.be/5J_7jswaK-c DataCite: aujourd'hui et à l'avenir: https://youtu.be/Xiut6gpTFIM DataCite: jetzt und in Zukunft: https://youtu.be/xByQAOEuTZY DataCite: ahora y en el futuro: https://youtu.be/hCIOWOJ_TIg
title: "Wir haben die Lektion gelernt"?
Creators: name: Hollogschwandtner, Michael
Year: 2021

description: Ziel der vorliegenden Arbeit ist eine Analyse der im Rahmen von Fest- und Gedenkreden artikulierten vergangenheitspolitischen Positionen hinsichtlich der Dimension Externalisierung – Internalisierung des Nationalsozialismus in die österreichische Geschichte. Die universalistische Opferthese, wie sie in Österreich bis in die 1990er-Jahre Staatsdoktrin war, wird dabei nur als eine mögliche Form der Externalisierung begriffen, deren Modifikation sich aufgrund veränderter nationaler wie insbesondere internationaler Rahmenbedingungen vollzog. Es wird der Frage nachgegangen, ob mit dem offiziellen Eingeständnis österreichischer Mitverantwortung ein Ende des „double speak“ (Anton Pelinka) einhergegangen ist. Die Darstellung von NS-TäterInnen und -ProfiteurInnen sowie der postnazistischen Kontinuitäten in der Zweiten Republik wird dabei ebenso untersucht wie jene der Shoah. Vor dem Hintergrund der seit den 1990er-Jahren (auch) in Österreich manifest gewordenen Prozesse der Europäisierung und Universalisierung des Gedenkens wird darüber hinaus analysiert, wie die Legitimationsfunktion staatlicher Vergangenheitspolitik unter den veränderten Rahmenbedingungen erfüllt wird: Wie, mit welchen inhaltlichen Bezügen und Auslassungen, mit welchen argumentativen Strategien, werden nationale wie europäische Identitätskonstruktionen vergangenheitspolitisch begründet? Methodisch baut die vorliegende Untersuchung auf den diskurshistorischen Studien von Ruth Wodak et al. zur Konstruktion nationaler Identität sowie zum Nachkriegsantisemitismus in Österreich auf. Mittels Kritischer Diskursanalyse werden ausgewählte Fest- und Gedenkreden untersucht, die im Zeitraum von 2008 bis 2019 im Rahmen zweier Feierlichkeiten gehalten wurden, an denen (auch) höchste staatliche RepräsentantInnen teilnehmen: Dem jährlich am 8. Mai stattfindenden „Fest der Freude“, welches durch das Mauthausen Komitee Österreich (MKÖ) initiiert wurde, sowie dem durch National- und Bundesrat gemeinsam begangenen „Gedenktag gegen Gewalt und Rassismus im Gedenken an die Opfer des Nationalsozialismus“.
On degenerate models of cosmic inflation
Creators: name: Gwyn, Rhiannon
name: Palma, Gonzalo A.
name: Sakellariadou, Mairi
name: Sypsas, Spyros
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this article we discuss the role of current and future CMB measurements in pinning down the model of inflation responsible for the generation of primordial curvature perturbations. By considering a parameterization of the effective field theory of inflation with a modified dispersion relation arising from heavy fields, we derive the dependence of cosmological observables on the scale of heavy physics $Λ_{\rm UV}$. Specifically, we show how the $f_{\rm NL}$ non-linearity parameters are related to the phase velocity of curvature perturbations at horizon exit, which is parameterized by $Λ_{\rm UV}$. Bicep2 and Planck findings are shown to be consistent with a value $Λ_{\rm UV} \sim Λ_{\rm GUT}$. However, we find a degeneracy in the parameter space of inflationary models that can only be resolved with a detailed knowledge of the shape of the non-Gaussian bispectrum.
description: 22pp., 1 fig; v2: added some clarifications and references, corrected typos, matches published version
Understanding faculty engagement in medical education
Creators: name: Giusti-Ehlert, Tatiana
name: Guerrero-Aponte, Manuel
Publisher: name: F1000 Research Limited
Year: 2024

description: Background 

Faculty engagement and work engagement are interconnected concepts receiving increased attention. Research has substantiated their impact on both teacher and employee performance, contributing to the achievement of organizational goals.

Work engagement in Health Professionals Education is a crucial research Held due to its consequences to any society. This work was done to better understand faculty engagement among medical teacher at the Luis Razetti School of Medicine (LRSM) of Universidad Central de Venezuela.

The aim of this paper was to address following research question: Is faculty engagement at LRSM high, even though most organizational determinants of work engagement are lacking?

Summary of Work

Faculty engagement among medical teachers was determined measuring work engagement using an internet (Google form)-based UWES survey, following guidelines from the authors for the Spanish version.

Results were compared with simple t-test with the UWES-15 international database which is derived from various sectors and countries as control group.

Summary of Results 

Out of the 285 invitations sent, we received 80 responses. After removing duplicate responses and empty surveys, we analyzed a total of 73. The overall response rate was 25.61%.

The hypothesis that work engagement levels were high among LRSM lecturers was conHrmed. Participants showed higher mean scores across all dimensions of work engagement compared to the control group. The dimension in which this group of lecturers performed higher was "absorption".

Discussion and Conclusion 

Faculty engagement seems to perform differently in this particular setting. These Hndings support self- determination theory, whereas lecturers with high-work engagement show internal locus of causality and act independently from organizational determinants of work engagement.

As educational institutions are intended to serve as natural environments for learning and personal development, they should create conducive spaces for both students and faculty. Implementing strategies that speciHcally target professional growth of teachers and staff within the educational context can undeniably enrich the learning environment for all stakeholders. This approach has the potential to enhance educational outcomes and foster greater social accountability of universities.

Take Home Message 

Understanding factors that play a role in faculty engagement in medical teachers may assist in the development of strategies to attract, retain, and inspire them in this crucial role for society.
Quasiclassical magnetic order and its loss in a spin-1/2 Heisenberg antiferromagnet on a triangular lattice with competing bonds
Creators: name: Li, Peggy H. Y.
name: Bishop, Raymond F.
name: Campbell, Charles E.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We use the coupled cluster method (CCM) to study the zero-temperature ground-state (GS) properties of a spin-1/2 $J_{1}$--$J_{2}$ Heisenberg antiferromagnet on a triangular lattice with competing nearest-neighbor and next-nearest-neighbor exchange couplings $J_{1}>0$ and $J_{2} \equiv κJ_{1}>0$, respectively, in the window $0 \leq κ< 1$. The classical version of the model has a single GS phase transition at $κ^{cl}=$1/8 in this window from a phase with 3-sublattice antiferromagnetic (AFM) 120$^{\circ}$ Néel order for $κ< κ^{cl}$ to an infinitely degenerate family of 4-sublattice AFM Néel phases for $κ> κ^{cl}$. This classical accidental degeneracy is lifted by quantum fluctuations, which favor a 2-sublattice AFM striped phase. For the quantum model we work directly in the thermodynamic limit of an infinite number of spins, with no consequent need for any finite-size scaling analysis of our results. We perform high-order CCM calculations within a well-controlled hierarchy of approximations, which we show how to extrapolate to the exact limit. In this way we find results for the case $κ= 0$ of the spin-1/2 model for the GS energy per spin, $E/N=-0.5521(2)J_{1}$, and the GS magnetic order parameter, $M=0.198(5)$, which are among the best available. For the spin-1/2 $J_{1}$--$J_{2}$ model we find that the classical transition at $κ=κ^{cl}$ is split into two quantum phase transition at $κ^{c}_{1}=0.060(10)$ and $κ^{c}_{2}=0.165(5)$. The two quasiclassical AFM states (viz., the 120$^{\circ}$ Néel state and the striped state) are found to be the stable GS phases in the regime $κ< κ^{c}_{1}$ and $κ> κ^{c}_{2}$, respectively, while in the intermediate regimes $κ^{c}_{1} < κ< κ^{c}_{2}$ the stable GS phase has no evident long-range magnetic order.
Gravitational Radiation from Compact Binary Pulsars
Creators: name: Antoniadis, John
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: An outstanding question in modern Physics is whether general relativity (GR) is a complete description of gravity among bodies at macroscopic scales. Currently, the best experiments supporting this hypothesis are based on high-precision timing of radio pulsars. This chapter reviews recent advances in the field with a focus on compact binary millisecond pulsars with white-dwarf (WD) companions. These systems - if modeled properly - provide an unparalleled test ground for physically motivated alternatives to GR that deviate significantly in the strong-field regime. Recent improvements in observational techniques and advances in our understanding of WD interiors have enabled a series of precise mass measurements in such systems. These masses, combined with high-precision radio timing of the pulsars, result to stringent constraints on the radiative properties of gravity, qualitatively very different from what was available in the past.
description: Short review chapter to appear in "Gravitational Wave Astrophysics" by Springer-Verlag, edited by Carlos F. Sopuerta; v3: a few major corrections and updated references. Comments are welcomed
Higher Order Lagrangians inspired by the Pais-Uhlenbeck Oscillator and their cosmological applications
Creators: name: Pulgar, Gustavo
name: Saavedra, Joel
name: Leon, Genly
name: Leyva, Yoelsy
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study higher derivative terms associated with scalar field cosmology. We consider a coupling between the scalar field and the geometry inspired by the Pais-Uhlenbeck oscillator, given by $α\partial_μ\partial^μϕ\partial_ν\partial^νϕ.$ We investigate the cosmological dynamics in a phase space. For $α>0$, we provide conditions for the stability of de Sitter solutions. In this case the crossing of the phantom divide $w_{DE}=-1$ occurs once; thereafter, the equation of state parameter remains under this line, asymptotically reaching towards the de Sitter solution from below. For $α<0,$ which is the portion of the parameter space where in addition to crossing the phantom divide, cyclic behavior is possible, we present regions in the parameter space where, according to Smilga's classification the ghost has benign or malicious behavior.
description: 30 pages, 7 figures. Affiliations updated. References were added. Some issues were clarified. The paper matches the published version
Extending linear growth functionals to functions of bounded fractional variation
Creators: name: Schönberger, Hidde
Publisher: name: arXiv
Year: 2022
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 49J45, 35R11, 26B30

description: In this paper we consider the minimization of a novel class of fractional linear growth functionals involving the Riesz fractional gradient. These functionals lack the coercivity properties in the fractional Sobolev spaces needed to apply the direct method. We therefore utilize the recently introduced spaces of bounded fractional variation and study the extension of the linear growth functional to these spaces through relaxation with respect to the weak* convergence. Our main result establishes an explicit representation for this relaxation, which includes an integral term accounting for the singular part of the fractional variation and features the quasiconvex envelope of the integrand. The role of quasiconvexity in this fractional framework is explained by a technique to switch between the fractional and classical settings. We complement the relaxation result with an existence theory for minimizers of the extended functional.
description: 18 pages
Search for non-pointing and delayed photons in the diphoton and missing transverse momentum final state in 8 TeV $pp$ collisions at the LHC using the ATLAS detector
Creators: name: ATLAS Collaboration
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A search has been performed, using the full 20.3 fb$^{-1}$ data sample of 8 TeV proton--proton collisions collected in 2012 with the ATLAS detector at the LHC, for photons originating from a displaced vertex due to the decay of a neutral long-lived particle into a photon and an invisible particle. The analysis investigates the diphoton plus missing transverse momentum final state, and is therefore most sensitive to pair-production of long-lived particles. The analysis technique exploits the capabilities of the ATLAS electromagnetic calorimeter to make precise measurements of the flight direction, as well as the time of flight, of photons. No excess is observed over the Standard Model predictions for background. Exclusion limits are set within the context of Gauge Mediated Supersymmetry Breaking models, with the lightest neutralino being the next-to-lightest supersymmetric particle and decaying into a photon and gravitino with a lifetime in the range from 250 ps to about 100 ns.
description: 16 pages plus author list + cover pages (30 pages total), 7 figures, 5 tables, submitted to Physics Review D, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2013-17/
Factor Models for Alpha Streams
Creators: name: Kakushadze, Zura
Publisher: name: arXiv
Year: 2014
Subjects: subject: Portfolio Management (q-fin.PM)
subject: Risk Management (q-fin.RM)
subject: FOS: Economics and business

description: We propose a framework for constructing factor models for alpha streams. Our motivation is threefold. 1) When the number of alphas is large, the sample covariance matrix is singular. 2) Its out-of-sample stability is challenging. 3) Optimization of investment allocation into alpha streams can be tractable for a factor model alpha covariance matrix. We discuss various risk factors for alphas such as: style risk factors; cluster risk factors based on alpha taxonomy; principal components; and also using the underlying tradables (stocks) as alpha risk factors, for which computing the factor loadings and factor covariance matrices does not involve any correlations with alphas, and their number is much larger than that of the relevant principal components. We draw insight from stock factor models, but also point out substantial differences.
description: 27 pages; discussion section and references added; to appear in The Journal of Investment Strategies
Non-equilibrium dynamics in a three state opinion formation model with stochastic extreme switches
Creators: name: Biswas, Kathakali
name: Sen, Parongama
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: We investigate the non-equilibrium dynamics of a three state kinetic exchange model of opinion formation, where switches between extreme states are possible, depending on the value of a parameter $q$. The mean field dynamical equations are derived and analysed for any $q$. The fate of the system under the evolutionary rules used in \cite{BCS} shows that it is dependent on the value of $q$ and the initial state in general. For $q=1$, which allows the extreme switches maximally, a quasi-conservation in the dynamics is obtained which renders it equivalent to the voter model. For general $q$ values, a "frozen" disordered fixed point is obtained which acts as an attractor for all initially disordered states. For other initial states, the order parameter grows with time $t$ as $\exp[α(q) t]$ where $α= \frac{1-q}{3-q}$ for $q\neq 1$ and follows a power law behaviour for $q=1$. Numerical simulations using a fully connected agent based model provide additional results like the system size dependence of the exit probability and consensus times that further accentuate the different behaviour of the model for $q=1$ and $q\neq 1$. The results are compared with the non-equilibrium phenomena in other well known dynamical systems.
description: 9 pages, 11 figures; new references and text added; some figures changed
title: Das Unterrichtsprinzip der Interkulturellen Bildung im Kontext der Österreichischen Gebärdensprache
Creators: name: Heinzel, Lisa-Marie
Year: 2021

description: Die vorliegende Diplomarbeit beschäftigt sich mit der Umsetzung des Unterrichtsprinzips der Interkulturellen Bildung im Kontext der Österreichischen Gebärdensprache und Gehörlosenkultur. Hierzu werden zunächst die didaktischen Grundsätze, Ziele und Begriffsdefinitionen dessen anhand theoretischer Literatur aus dem Fachbereich „Deutsch als Zweit- und Fremdsprache“ und den deaf studies diskutiert und aufgearbeitet. Die Erkenntnisse daraus werden um die Ergebnisse aus drei qualitativ ausgewerteten Expert_inneninterviews ergänzt, um Perspektiven aus der aktuellen Praxis und von gehörlosen Personen zu berücksichtigen. Die Ergebnisse der Forschung zeigen den Wunsch nach ÖGS als Unterrichtsfach sowie die Notwendigkeit von mehr gehörlosen Personen in der Rolle als Lehrende und professionelle Handelnde deutlich. Ebenso wird aufgezeigt, dass die Ausgrenzung gehörloser Personen im österreichischen Bildungssystem weiterhin besteht und mithilfe der Umsetzung von Interkultureller Bildung dagegen angekämpft werden kann. Diese Arbeit soll Interessierten die Möglichkeit geben, sich einen ersten Überblick über Optionen zur Umsetzung des Unterrichtsprinzips in Österreich in besagten Kontexten zu verschaffen.
Black hole thermodynamics from logotropic fluids
Creators: name: Capozziello, Salvatore
name: D'Agostino, Rocco
name: Lapponi, Alessio
name: Luongo, Orlando
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show that the Einstein field equations with a negative cosmological constant can admit black hole solutions whose thermodynamics coincides with that of logotropic fluids, recently investigated to heal some cosmological and astrophysical issues. For this purpose, we adopt the Anton-Schmidt equation of state, which represents a generalized version of logotropic fluids. We thus propose a general treatment to obtain an asymptotic anti-de Sitter metric, reproducing the thermodynamic properties of both Anton-Schmidt and logotropic fluids. Hence, we explore how to construct suitable spacetime functions, invoking an event horizon and fulfilling the null, weak, strong and dominant energy conditions. We further relax the strong energy condition to search for possible additional solutions. Finally, we discuss the optical properties related to a specific class of metrics and show how to construct an effective refractive index depending on the spacetime functions and the thermodynamic quantities of the fluid under study. We also explore possible departures with respect to the case without the fluid.
description: 13 pages, 3 figures. Accepted for publication in EPJC
Mixed neutron-star-plus-wormhole systems: Rotating configurations
Creators: name: Dzhunushaliev, Vladimir
name: Folomeev, Vladimir
name: Kleihaus, Burkhard
name: Kunz, Jutta
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present rapidly rotating neutron stars featuring wormholes in their centers. They arise in general relativity in the presence of a ghost scalar field. The nuclear matter is described by a polytropic equation of state, yielding realistic masses and radii for the neutron stars. The wormholes possess small circumferential radii of size up to 3 km. With increasing wormhole size, the masses and radii of the stars decrease, while the domain of existence of these rotating mixed neutron-star-plus-wormhole systems retains the characteristic properties of a rotating neutron star domain. The question of stability of the mixed configurations under consideration is briefly discussed.
description: 10 pages, 1 figure, minor corrections to content, version published in PRD
MPEC 2024-C35 : 2024 BC6
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 BC6

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Forty-Seven Milky Way-Sized, Extremely Diffuse Galaxies in the Coma Cluster
Creators: name: van Dokkum, Pieter
name: Abraham, Roberto
name: Merritt, Allison
name: Zhang, Jielai
name: Geha, Marla
name: Conroy, Charlie
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We report the discovery of 47 low surface brightness objects in deep images of a 3 x 3 degree field centered on the Coma cluster, obtained with the Dragonfly Telephoto Array. The objects have central surface brightness mu(g,0) ranging from 24 - 26 mag/arcsec^2 and effective radii r_e = 3"-10", as measured from archival Canada France Hawaii Telescope images. From their spatial distribution we infer that most or all of the objects are galaxies in the Coma cluster. This relatively large distance is surprising as it implies that the galaxies are very large: with r_e = 1.5 - 4.6 kpc their sizes are similar to those of L* galaxies even though their median stellar mass is only ~6 x 10^7 Solar masses. The galaxies are relatively red and round, with = 0.8 and  = 0.74. One of the 47 galaxies is fortuitously covered by a deep Hubble Space Telescope ACS observation. The ACS imaging shows a large spheroidal object with a central surface brightness mu(g,0) = 25.8 mag/arcsec^2, a Sersic index n=0.6, and an effective radius of 7", corresponding to 3.4 kpc at the distance of Coma. The galaxy is not resolved into stars, consistent with expectations for a Coma cluster object. We speculate that UDGs may have lost their gas supply at early times, possibly resulting in very high dark matter fractions.
description: Published in ApJ Letters (with a table containing basic information for all the galaxies). To illustrate how big and fluffy these things are we made a graphic comparing the one with ACS imaging (Fig 4) to several well-known galaxies, if they were at the same distance: http://www.astro.yale.edu/dokkum/coma_udgs/sizes.jpg
Survival Probabilities at Spherical Frontiers
Creators: name: Lavrentovich, Maxim O.
name: Nelson, David R.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: Motivated by tumor growth and spatial population genetics, we study the interplay between evolutionary and spatial dynamics at the surfaces of three-dimensional, spherical range expansions. We consider range expansion radii that grow with an arbitrary power-law in time: $R(t)=R_0(1+t/t^*)^Θ$, where $Θ$ is a growth exponent, $R_0$ is the initial radius, and $t^*$ is a characteristic time for the growth, to be affected by the inflating geometry. We vary the parameters $t^*$ and $Θ$ to capture a variety of possible growth regimes. Guided by recent results for two-dimensional inflating range expansions, we identify key dimensionless parameters that describe the survival probability of a mutant cell with a small selective advantage arising at the population frontier. Using analytical techniques, we calculate this probability for arbitrary $Θ$. We compare our results to simulations of linearly inflating expansions ($Θ=1$ spherical Fisher-Kolmogorov-Petrovsky-Piscunov waves) and treadmilling populations ($Θ=0$, with cells in the interior removed by apoptosis or a similar process). We find that mutations at linearly inflating fronts have survival probabilities enhanced by factors of 100 or more relative to mutations at treadmilling population frontiers. We also discuss the special properties of "marginally inflating" $(Θ=1/2)$ expansions.
description: 35 pages, 11 figures, revised version
Multiqudit quantum hashing and its implementation based on orbital angular momentum encoding
Creators: name: Akat'ev, D. O.
name: Vasiliev, A. V.
name: Shafeev, N. M.
name: Ablayev, F. M.
name: Kalachev, A. A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A new version of quantum hashing technique is developed wherein a quantum hash is constructed as a sequence of single-photon high-dimensional states (qudits). A proof-of-principle implementation of the high-dimensional quantum hashing protocol using orbital-angular momentum encoding of single photons is implemented. It is shown that the number of qudits decreases with increase of their dimension for an optimal ratio between collision probability and decoding probability of the hash. Thus, increasing dimension of information carriers makes quantum hashing with single photons more efficient.
The periodic sl(2|1) alternating spin chain and its continuum limit as a bulk Logarithmic Conformal Field Theory at c=0
Creators: name: Gainutdinov, A. M.
name: Read, N.
name: Saleur, H.
name: Vasseur, R.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Quantum Algebra (math.QA)
subject: Representation Theory (math.RT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The periodic sl(2|1) alternating spin chain encodes (some of) the properties of hulls of percolation clusters, and is described in the continuum limit by a logarithmic conformal field theory (LCFT) at central charge c=0. This theory corresponds to the strong coupling regime of a sigma model on the complex projective superspace $\mathbb{CP}^{1|1} = \mathrm{U}(2|1) / (\mathrm{U}(1) \times \mathrm{U}(1|1))$, and the spectrum of critical exponents can be obtained exactly. In this paper we push the analysis further, and determine the main representation theoretic (logarithmic) features of this continuum limit by extending to the periodic case the approach of [N. Read and H. Saleur, Nucl. Phys. B 777 316 (2007)]. We first focus on determining the representation theory of the finite size spin chain with respect to the algebra of local energy densities provided by a representation of the affine Temperley-Lieb algebra at fugacity one. We then analyze how these algebraic properties carry over to the continuum limit to deduce the structure of the space of states as a representation over the product of left and right Virasoro algebras. Our main result is the full structure of the vacuum module of the theory, which exhibits Jordan cells of arbitrary rank for the Hamiltonian.
description: 69pp, 8 figs