cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Lattice status of gluonia/glueballs
Creators: name: McNeile, Craig
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: I briefly review lattice QCD calculations that study the 0++ glueball and discuss implications for light flavour singlet 0++ mesons.
description: 4 pages. Write up for the talk presented at 14th High-Energy Physics International Conference in Quantum Chromodynamics (QCD 08), Montpellier, France, 7-12 Jul 2008
Central limit theorems for eigenvalues in a spiked population model
Creators: name: Bai, Zhidong
name: Yao, Jian-feng
Publisher: name: arXiv
Year: 2008
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: In a spiked population model, the population covariance matrix has all its eigenvalues equal to units except for a few fixed eigenvalues (spikes). This model is proposed by Johnstone to cope with empirical findings on various data sets. The question is to quantify the effect of the perturbation caused by the spike eigenvalues. A recent work by Baik and Silverstein establishes the almost sure limits of the extreme sample eigenvalues associated to the spike eigenvalues when the population and the sample sizes become large. This paper establishes the limiting distributions of these extreme sample eigenvalues. As another important result of the paper, we provide a central limit theorem on random sesquilinear forms.
description: Published in at http://dx.doi.org/10.1214/07-AIHP118 the Annales de l'Institut Henri Poincar\'e - Probabilit\'es et Statistiques (http://www.imstat.org/aihp/) by the Institute of Mathematical Statistics (http://www.imstat.org)
title: KLIMONAS-Ch05-A05 – Plans, coupes et photos des structures liées à la seconde phase du Bâtiment communautaire, complémentaires de celles produites dans le chapitre 5
title: KLIMONAS-Ch05-A05 –Plans, sections and photos of structures related to the second phase of the Communal building, complementary to those produced in Chapter 5
Creators: name: FRANEL, Yodrik
name: VIGNE, Jean-Denis
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
Year: 2023

description: Annexe de : Vigne J.-D., Briois F., Guilaine J. (dir.), « Klimonas, un village néolithique pré-céramique ancien à Chypre », Gallia Préhistoire & Paléorient, Supplément international 1,CNRS Éditions, Paris, 2023.
description: Appendix of: Vigne J.-D., Briois F., Guilaine J. (eds.), « Klimonas, an Early Pre-Pottery Neolithic village in Cyprus », Gallia Préhistoire & Paléorient, International Supplement 1, CNRS Éditions, Paris, 2023.
High resolution calculation for the optimisation of commercial LED spectra in health applications
Creators: name: Adrià Huguet-Ferran
name: Pérez, Cristian Morales
Publisher: name: Zenodo
Year: 2021
Subjects: White Paper
ET
high-resolution calculation
SHAPE

description: The proposed project is related to the installation of bioadapted lamps at a hospital facility. The different partners involved in the project are: the scientific team in charge of the hospital itself, a manufacturer of light sources, a lamp control platform and Kumux - Enlighting Technologies (ET). In this context, ET will be responsible for performing the high-resolution calculations of the LED system in the lamp to be able to choose different light scenarios taking into account the visual, non-visual and power properties of light, such as luminous and radiant flux or the energy efficiency of the particular light scenario. The main goal of the project is, once the results of the simulation have been processed and replicated to the lamps, to be able to quantitatively demonstrate the incidence of bioadapted light in the recovery of patients, since there are preliminary studies that show very significant re-ductions in the hospitalisation period of the patient.
 With the computer means available in Kumux, it is not possible to perform high-resolution calculations of the lamps used in the project. Our computational system only allows calculations at low resolution, so in this SHAPE project, we aim to simulate a lighting scenario at high resolution, which would take months of computation with our current code and computer means.
Video Conferencing and Flow-Rate Fairness: A First Look at Zoom and the Impact of Flow-Queuing AQM
Creators: name: Sander, Constantin
name: Kunze, Ike
name: Wehrle, Klaus
name: Rüth, Jan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Congestion control is essential for the stability of the Internet and the corresponding algorithms are commonly evaluated for interoperability based on flow-rate fairness. In contrast, video conferencing software such as Zoom uses custom congestion control algorithms whose fairness behavior is mostly unknown. Aggravatingly, video conferencing has recently seen a drastic increase in use - partly caused by the COVID-19 pandemic - and could hence negatively affect how available Internet resources are shared. In this paper, we thus investigate the flow-rate fairness of video conferencing congestion control at the example of Zoom and influences of deploying AQM. We find that Zoom is slow to react to bandwidth changes and uses two to three times the bandwidth of TCP in low-bandwidth scenarios. Moreover, also when competing with delay aware congestion control such as BBR, we see high queuing delays. AQM reduces these queuing delays and can equalize the bandwidth use when used with flow-queuing. However, it then introduces high packet loss for Zoom, leaving the question how delay and loss affect Zoom's QoE. We hence show a preliminary user study in the appendix which indicates that the QoE is at least not improved and should be studied further.
SCP06F6: A carbon-rich extragalactic transient at redshift z~0.14?
Creators: name: Gaensicke, B. T.
name: Levan, A. J.
name: Marsh, T. R.
name: Wheatley, P. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We show that the spectrum of the unusual transient SCP06F6 is consistent with emission from a cool, optically thick and carbon-rich atmosphere if the transient is located at a redshift of z~0.14. The implied extragalactic nature of the transient rules out novae, shell flashes, and V838 Mon-like events as cause of the observed brightening. The distance to SCP06F6 implies a peak magnitude of M_I ~- 18, in the regime of supernovae. While the morphology of the light curve of SCP06F6 around the peak in brightness resembles the slowly evolving Type IIn supernovae SN1994Y and SN2006gy its spectroscopic appearence differs from all previous observed supernovae. We further report the detection of an X-ray source co-incident with SCP06F6 in a target of opportunity XMM-Newton observation made during the declining phase of the transient. The X-ray luminosity of L_X ~- (5+-1)e42 erg/s is two orders of magnitude higher than observed to date from supernovae. If related to a supernova event, SCP06F6 may define a new class. An alternative, though less likely, scenario is the tidal disruption of a carbon-rich star.
description: accepted version
Measurements of Photospheric and Chromospheric Magnetic Field Structures Associated with Chromospheric Heating over a Solar Plage Region
Creators: name: Anan, Tetsu
name: Schad, Thomas A.
name: Kitai, Reizaburo
name: Dima, Gabriel I.
name: Jaeggli, Sarah A.
name: Tarr, Lucas A.
name: Collados, Manuel
name: Dominguez-Tagle, Carlos
name: Kleint, Lucia
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: In order to investigate the relation between magnetic structures and the signatures of heating in plage regions, we observed a plage region with the He I 1083.0 nm and Si I 1082.7 nm lines on 2018 October 3 using the integral field unit mode of the GREGOR Infrared Spectrograph (GRIS) installed at the GREGOR telescope. During the GRIS observation, the Interface Region Imaging Spectrograph (IRIS) obtained spectra of the ultraviolet Mg II doublet emitted from the same region. In the periphery of the plage region, within the limited field of view seen by GRIS, we find that the Mg II radiative flux increases with the magnetic field in the chromosphere with a factor of proportionality of 2.38 \times 10^4 erg cm^{-2} s^{-1} G^{-1}. The positive correlation implies that magnetic flux tubes can be heated by Alfv'en wave turbulence or by collisions between ions and neutral atoms relating to Alfv'en waves. Within the plage region itself, the radiative flux was large between patches of strong magnetic field strength in the photosphere, or at the edges of magnetic patches. On the other hand, we do not find any significant spatial correlation between the enhanced radiative flux and the chromospheric magnetic field strength or the electric current. In addition to the Alfv'en wave turbulence or collisions between ions and neutral atoms relating to Alfv'en waves, other heating mechanisms related to magnetic field perturbations produced by interactions of magnetic flux tubes could be at work in the plage chromosphere.
description: 19 pages, 18 figures, 2 tables, accepted for publication in The Astrophysical Journal
FORT: Right-proving and Attribute-blinding Self-sovereign Authentication
Creators: name: Salleras, Xavier
name: Rovira, Sergi
name: Daza, Vanesa
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: Nowadays, there is a plethora of services that are provided and paid for online, like video streaming subscriptions, car or parking sharing, purchasing tickets for events, etc. Online services usually issue tokens directly related to the identities of their users after signing up into their platform, and the users need to authenticate using the same credentials each time they are willing to use the service. Likewise, when using in-person services like going to a concert, after paying for this service the user usually gets a ticket which proves that he/she has the right to use that service. In both scenarios, the main concerns are the centralization of the systems, and that they do not ensure customers' privacy. The involved Service Providers are Trusted Third Parties, authorities that offer services and handle private data about users. In this paper, we design and implement FORT, a decentralized system that allows customers to prove their right to use specific services (either online or in-person) without revealing sensitive information. To achieve decentralization we propose a solution where all the data is handled by a Blockchain. We describe and uniquely identify users' rights using Non-Fungible Tokens (NFTs), and possession of these rights is demonstrated by using Zero-Knowledge Proofs, cryptographic primitives that allow us to guarantee customers' privacy. Furthermore, we provide benchmarks of FORT which show that our protocol is efficient enough to be used in devices with low computing resources, like smartphones or smartwatches, which are the kind of devices commonly used in our use case scenario.
ALFRED: a methodology to enable component fault trees for layered architectures
Creators: name: Hoefig, Kai
name: Zeller, Marc
name: Heilmann, Reiner
Publisher: name: arXiv
Year: 2021
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Identifying drawbacks or insufficiencies in terms of safety is important also in early development stages of safety critical systems. In industry, development artefacts such as components or units, are often reused from existing artefacts to save time and costs. When development artefacts are reused, their existing safety analysis models are an important input for an early safety assessment for the new system, since they already provide a valid model. Component fault trees support such reuse strategies by a compositional horizontal approach. But current development strategies do not only divide systems horizontally, e.g., By encapsulating different functionality into separate components and hierarchies of components, but also vertically, e.g. Into software and hardware architecture layers. Current safety analysis methodologies, such as component fault trees, do not support such vertical layers. Therefore, we present here a methodology that is able to divide safety analysis models into different layers of a systems architecture. We use so called Architecture Layer Failure Dependencies to enable component fault trees on different layers of an architecture. These dependencies are then used to generate safety evidence for the entire system and over all different architecture layers. A case study applies the approach to hardware and software layers.
RESTAURAÇÃO CLASSE IV EM DENTES ANTERIORES: RELATO DE CASO
Creators: name: Micherland de Oliveira SOUSA
name: Izabela Cristina Furtado PINTO
name: Marlene Ribeiro de OLIVEIRA
Publisher: name: Zenodo
Year: 2024
Subjects: Restauração Dentária
Estética Dentária
Resinas Compostas
Restauração Classe IV

description: RESUMO

 

A restauração de Classe IV em dentes anteriores utilizando resinas compostas oferece uma solução eficaz para problemas estéticos e funcionais, principalmente na substituição de restaurações antigas. Este artigo relata um caso clínico onde a escolha de resinas nanohíbridas e a aplicação de técnicas adesivas e de estratificação resultaram em uma restauração que replicou com precisão a forma, cor e textura dos dentes naturais. A técnica de isolamento absoluto foi essencial para garantir a adesão adequada e a durabilidade da restauração. A abordagem detalhada e o planejamento individualizado evidenciam a importância dessas práticas na reabilitação estética e funcional, ressaltando o impacto positivo na autoestima do paciente.
title: Front Matter, Table of Contents, Preface, Committees
Creators: name: Beigi, Salman
name: König, Robert
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2015
Subjects: subject: Front Matter
subject: Table of Contents
subject: Preface
subject: Committees

description: Front Matter, Table of Contents, Preface, Committees
description: LIPIcs, Vol. 44, 10th Conference on the Theory of Quantum Computation, Communication and Cryptography (TQC 2015), pages i-xiv
Band Jahn-Teller Instability and Formation of Valence Bond Solid in a Mixed-Valent Spinel Oxide LiRh2O4
Creators: name: Okamoto, Yoshihiko
name: Niitaka, Seiji
name: Uchida, Masaya
name: Waki, Takeshi
name: Takigawa, Masashi
name: Nakatsu, Yoshitaka
name: Sekiyama, Akira
name: Suga, Shigemasa
name: Arita, Ryotaro
name: Takagi, Hidenori
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We have synthesized a new spinel oxide LiRh2O4 with a mixed-valent configuration of Rh3+ and Rh4+. At room temperature it is a paramagnetic metal, but on cooling, a metal-insulator transition occurs and a valence bond solid state is formed below 170 K. We argue that the formation of valence bond solid is promoted by a band Jahn-Teller transition at 230 K and the resultant confinement of t2g holes within the xy band. The band Jahn-Teller instability is also responsible for the observed enhanced thermoelectric power in the orbital disordered phase above 230 K.
description: 7 pages, 4 figures
μSR investigation of the Fe-doped Ca$_{3}$Ru$_{2}$O$_{7}$ polar metal
Creators: name: Lamura, G.
name: Das, D.
name: Shang, T.
name: Peng, J.
name: Wang, Y.
name: Mao, Z. Q.
name: Shiroka, T.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Ca$_{3}$Ru$_{2}$O$_{7}$ is a polar metal that belongs to the class of multiferroic magnetic materials. Here, tiny amounts of Fe doping in the Ru sites bring about dramatic changes in the electronic and magnetic properties and generate a complex H-T phase diagram. To date, not much is known about the ground state of such a system in the absence of magnetic field. By performing muon-spin spectroscopy ($μ$SR) measurements in 5% Fe-doped Ca$_{3}$Ru$_{2}$O$_{7}$ single crystals, we investigate its electronic properties at a local level. Transverse-field $μ$SR results indicate a very sharp normal-to-antiferromagnetic transition at T$_{N}$ = 79.7(1) K, with a width of only 1 K. Zero-field $μ$SR measurements in the magnetically ordered state allow us to determine the local fields B$_{i}$ at the muon implantation sites. By symmetry, muons stopping close to the RuO$_{2}$ planes detect only the weak nuclear dipolar fields, while those stopping next to apical oxygens sense magnetic fields as high as 150 mT. In remarkable agreement with the nominal Fe-doping, a $\sim$ 6% minority of the these muons feel slightly lower fields, reflecting a local magnetic frustration induced by iron ions. Finally, B$_{i}$ shows no significant changes across the metal-to-insulator transition, close to 40 K. We ascribe this surprising lack of sensitivity to the presence of crystal twinning.
description: 6 pages, 6 figures
title: Superimposing Dynamic Range
Creators: name: Bimber, Oliver
name: Iwai, Daisuke
Publisher: name: Bauhaus-Universität Weimar
Year: 2012
Subjects: subject: CGI
subject: 000

description: Replacing a uniform illumination by a high-frequent illumination enhances the contrast of observed and captured images. We modulate spatially and temporally multiplexed (projected) light with reflective or transmissive matter to achieve high dynamic range visualizations of radiological images on printed paper or ePaper, and to boost the optical contrast of images viewed or imaged with light microscopes.
Brane cosmology, Weyl fluid, and density perturbations
Creators: name: Pal, Supratik
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We develop a technique to study relativistic perturbations in the generalised brane cosmological scenario, which is a generalisation of the multi-fluid cosmological perturbations to brane cosmology. The novelty of the technique lies in the inclusion of a radiative bulk which is responsible for bulk-brane energy exchange, and in turn, modifies the standard perturbative analysis to a great extent. The analysis involves a geometric fluid -- called the Weyl fluid -- whose nature and role have been studied extensively both for the empty bulk and the radiative bulk scenario. Subsequently, we find that this Weyl fluid can be a possible geometric candidate for dark matter in this generalised brane cosmological framework.
description: 18 pages, 1 figure, accepted for publication in Phys.Rev.D
Web-Based Methods for X-ray and Photoelectron Spectroscopies
Creators: name: Devereaux, T. P.
name: Moritz, B.
name: Jia, C.
name: Kas, J. J.
name: Rehr, J. J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We present a simplified web-based application for simulating x-ray and photoelectron spectra of transition metals, built around the notion that web-based applications lower the bar for novice users. The application provides a simple interface to simulate x-ray absorption spectroscopy, resonant inelastic x-ray scattering, and angle-resolved photoemission spectroscopy, incorporating the effects of local electronic interactions, which give rise to multiplets, spin-orbit coupling, crystal field effects, and ligand hybridization/charge transfer. Results can be obtained that highlight the key role of photon polarization.
description: 6 pages, 10 figures. Software can be accessed at https://www-times.stanford.edu/index and https://times-webxrs.stanford.edu
title: Kulturelles Erbe im digitalen Zeitalter: der Weg der Bibliotheken
Creators: name: Simon-Ritz, Frank
Publisher: name: Bauhaus-Universität Weimar
Year: 2011
Subjects: subject: Digitalisierung
subject: 800

description: Der Artikel, der am 5. November 2011 in leicht veränderter Form in der "Thüringischen Landeszeitung" erschienen ist, beschreibt wichtige Trends bei der Digitalisierung in Bibliotheken seit 1993.
Predicting exoplanet mass from radius and incident flux: A Bayesian mixture model
Creators: name: Ma, Qi
name: Ghosh, Sujit K
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The relationship between mass and radius (M-R relation) is the key for inferring the planetary compositions and thus valuable for the studies of formation and migration models. However, the M-R relation alone is not enough for planetary characterization due to the dependence of it on other confounding variables. This paper provides a non-trivial extension of the M-R relation by including the incident flux as an additional variable. By using Bayesian hierarchical modeling (BHM) that leverages the flexibility of finite mixture models, a probabilistic mass-radius-flux relationship (M-R-F relation) is obtained based on a sample of 319 exoplanets. We find that the flux has nonnegligible impact on the M-R relation, while such impact is strongest for hot-Jupiters. On the population level, the planets with higher level of flux tend to be denser, and high flux could trigger significant mass loss for plants with radii larger than $13R_{\oplus}$. As a result, failing to account for the flux in mass prediction would cause systematic over or under-estimation. With the recent advent of computing power, although a lot of complex statistical models can be fitted using Monte Carlo methods, it has largely remain illusive how to validate these complex models when the data are observed with large measurement errors. We present two novel methods to examine model assumptions, which can be used not only for the models we present in this paper but can also be adapted for other statistical models.
description: Accepted for publication in MNRAS
Origin of large thermopower in LiRh$_2$O$_4$
Creators: name: Arita, R.
name: Kuroki, K.
name: Held, K.
name: Lukoyanov, A. V.
name: Skornyakov, S.
name: Anisimov, V. I.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Motivated by the newly synthesized mixed-valent spinel LiRh$_2$O$_4$ for which a large thermopower is observed in the metallic cubic phase above 230K [Okamoto {\it et al.} (arXiv:0806.2504)], we calculate the Seebeck coefficient by the combination of local density approximation and dynamical mean field theory (LDA+DMFT). The experimental values are well reproduced not only by LDA+DMFT but also by the less involved Boltzmann equation approach. A careful analysis of the latter shows unexpectedly that the origin of the large thermopower shares a common root with a very different oxide: Na$_x$CoO$_2$. We also discuss how it is possible to further increase the powerfactor of LiRh$_2$O$_4$ through doping, which makes the material even more promoising for technological applications.
description: 5 pages, 5 figures
Supplementary document for Propagation mechanism of point defects in fused silica induced by gamma-ray irradiation - 7210211.pdf
Creators: name: Gao, Xing
name: Qi, Yongnian
name: Mu, Qing
name: Yan, Ying
name: Zhou, Ping
Publisher: name: Optica Publishing Group
Year: 2024
Subjects: Uncategorized

description: Parameters of the Gaussian fitting peaks of absorption spectrum
Recent Developments in the Casimir Effect
Creators: name: Milton, K. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this talk I review various developments in the past year concerning quantum vacuum energy, the Casimir effect. In particular, there has been continuing controversy surrounding the temperature correction to the Lifshitz formula for the Casimir force between real materials, be they metals or semiconductors. Consensus has emerged as to how Casimir energy accelerates in a weak gravitational field; quantum vacuum energy, including the divergent parts which renormalize the masses of the Casimir plates, accelerates indeed according to the equivalence principle. Significant development has been forthcoming in applying the multiple scattering formalism to describe the interaction between nontrivial objects. In weak coupling, closed-form expressions for the Casimir force between the bodies, which for example reveal significant discrepancies from the naive proximity force approximation, can be achieved in many cases.
description: 29 pages, 14 figures, uses jpconf.cls style. Invited opening talk at "60 Years of the Casimir Effect," Brasilia, June 21-29, 2008
Bouncing Braneworld with Born-Infeld and Gauss-Bonnet
Creators: name: Mukherji, Sudipta
name: Pal, Supratik
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show the existence of some bouncing cosmological solutions in the braneworld scenario. More specifically, we consider a dynamical three-brane in the background of Born-Infeld and electrically charged Gauss-Bonnet black hole. We find that, in certain range of parameter space, the brane universe, at least classically, never shrinks to a zero size, resulting in a singularity-free cosmology within the classical domain.
description: 13 pages, 4 figures. Minor revisions. To appear in Mod.Phys.Lett.A
Gauss-Bonnet Term on Vacuum Decay
Creators: name: Cai, Rong-Gen
name: Hu, Bin
name: Koh, Seoktae
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the effect of the Gauss-Bonnet term on vacuum decay process in the Coleman-De Luccia formalism. The Gauss-Bonnet term has an exponential coupling with the real scalar field, which appears in the low energy effective action of string theories. We calculate numerically the instanton solution, which describes the process of vacuum decay, and obtain the critical size of bubble. We find that the Gauss-Bonnet term has a nontrivial effect on the false vacuum decay, depending on the Gauss-Bonnet coefficient.
description: 18 pages, 7 figures, references added, 2 figures replacement, discussion about thin-wall approximation revised, to appear in PHYS. LETT. B
Time and Evolution in Quantum and Classical Cosmology
Creators: name: Kamenshchik, Alexander Yu.
name: Rodriguez, Jeinny Nallely Perez
name: Vardanyan, Tereza
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We analyze the issue of dynamical evolution and time in quantum cosmology. We emphasize the problem of choice of phase space variables that can play the role of a time parameter in such a way that for expectation values of quantum operators the classical evolution is reproduced. We show that it is neither necessary nor sufficient for the Poisson bracket between the time variable and the super-Hamiltonian to be equal to unity in all of the phase space. We also discuss the question of switching between different internal times as well as the Montevideo interpretation of quantum theory.
description: 30 pages, published in Universe 7, 219 (2021) in the Special Issue on "Quantum Cosmology", Ed. Paulo Vargas Moniz
title: Front Matter, Table of Contents, Preface, Conference Organization
Creators: name: Harsha, Prahladh
name: Ramalingam, G.
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2015
Subjects: subject: Front Matter
subject: Table of Contents
subject: Preface
subject: Conference Organization

description: Front Matter, Table of Contents, Preface, Conference Organization
description: LIPIcs, Vol. 45, 35th IARCS Annual Conference on Foundations of Software Technology and Theoretical Computer Science (FSTTCS 2015), pages i-xiv
Momentum distribution of the Uniform Electron Gas at finite temperature: Effects of spin-polarization
Creators: name: Dornheim, Tobias
name: Vorberger, Jan
name: Militzer, Burkhard
name: Moldabekov, Zhandos A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We carry out extensive direct path integral Monte Carlo (PIMC) simulations of the uniform electron gas (UEG) at finite temperature for different values of the spin-polarization $ξ$. This allows us to unambiguously quantify the impact of spin-effects on the momentum distribution function $n(\mathbf{k})$ and related properties. We find that interesting physical effects like the interaction-induced increase in the occupation of the zero-momentum state $n(\mathbf{0})$ substantially depend on $ξ$. Our results further advance the current understanding of the UEG as a fundamental model system, and are of practical relevance for the description of transport properties of warm dense matter in an external magnetic field. All PIMC results are freely available online and can be used as a benchmark for the development of new methods and applications.
Proposition of a full deterministic medium access method for wireless network in a robotic application
Creators: name: Bossche, Adrien Van Den
name: Val, Thierry
name: Campo, Eric
Publisher: name: arXiv
Year: 2008
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Today, many network applications require shorter react time. Robotic field is an excellent example of these needs: robot react time has a direct effect on its task's complexity. Here, we propose a full deterministic medium access method for a wireless robotic application. This contribution is based on some low-power wireless personal area networks, like ZigBee standard. Indeed, ZigBee has identified limits with Quality of Service due to non-determinist medium access and probable collisions during medium reservation requests. In this paper, two major improvements are proposed: an efficient polling of the star nodes and a temporal deterministic distribution of peer-to-peer messages. This new MAC protocol with no collision offers some QoS faculties.
On the use of field RR Lyrae as Galactic probes: IV. New insights into and around the Oosterhoff dichotomy
Creators: name: Fabrizio, M.
name: Braga, V. F.
name: Crestani, J.
name: Bono, G.
name: Ferraro, I.
name: Fiorentino, G.
name: Iannicola, G.
name: Preston, G. W.
name: Sneden, C.
name: Thévenin, F.
name: Altavilla, G.
name: Chaboyer, B.
name: Dall'Ora, M.
name: da Silva, R.
name: Grebel, E. K.
name: Gilligan, C. K.
name: Lala, H.
name: Lemasle, B.
name: Magurno, D.
name: Marengo, M.
name: Marinoni, S.
name: Marrese, P. M.
name: Martìnez-Vàzquez, C. E.
name: Matsunaga, N.
name: Monelli, M.
name: Mullen, J. P.
name: Neeley, J.
name: Nonino, M.
name: Prudil, Z.
name: Salaris, M
name: Stetson, P. B.
name: Valenti, E.
name: Zoccali, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We discuss the largest and most homogeneous spectroscopic dataset of field RR Lyrae variables (RRLs) available to date. We estimated abundances using both high-resolution and low-resolution ({ΔS} method) spectra for fundamental (RRab) and first overtone (RRc) RRLs. The iron abundances for 7,941 RRLs were supplemented with similar literature estimates available, ending up with 9,015 RRLs (6,150 RRab, 2,865 RRc). The metallicity distribution shows a mean value of = -1.51\pm0.01, and σ(standard deviation)= 0.41 dex with a long metal-poor tail approaching [Fe/H] = -3 and a sharp metal-rich tail approaching solar iron abundance. The RRab variables are more metal-rich (ab = -1.48\pm0.01, σ = 0.41 dex) than RRc variables (c = -1.58\pm0.01, σ = 0.40 dex). The relative fraction of RRab variables in the Bailey diagram (visual amplitude vs period) located along the short-period (more metal-rich) and the long-period (more metal-poor) sequences are 80% and 20\%, while RRc variables display an opposite trend, namely 30\% and 70\%. We found that the pulsation period of both RRab and RRc variables steadily decreases when moving from the metal-poor to the metal-rich regime. The visual amplitude shows the same trend, but RRc amplitudes are almost two times more sensitive than RRab amplitudes to metallicity. We also investigated the dependence of the population ratio (Nc/Ntot) of field RRLs on the metallicity and we found that the distribution is more complex than in globular clusters. The population ratio steadily increases from ~0.25 to ~0.36 in the metal-poor regime, it decreases from ~0.36 to ~0.18 for -1.8 < [Fe/H] < -0.9 and it increases to a value of ~0.3 approaching solar iron abundance.
description: 22 pages, 13 figures, 3 tables. Accepted for publication in ApJ
Resonance phenomena in ultracold dipole-dipole scattering
Creators: name: Roudnev, V.
name: Cavagnero, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Elastic scattering resonances occurring in ultracold collisions of either bosonic or fermionic polar molecules are investigated. The Born-Oppenheimer adiabatic representation of the two-bodydynamics provides both a qualitative classification scheme and a quantitative WKB quantization condition that predicts several sequences of resonant states. It is found that the near-threshold energy dependence of ultracold collision cross sections varies significantly with the particle exchange symmetry, with bosonic systems showing much smoother energy variations than their fermionic counterparts. Resonant variations of the angular distributions in ultracold collisions are also described.
description: 19 pages, 6 figures, revtex4, submitted to J. Phys. B
DIISC-II: Unveiling the Connections between Star Formation and ISM in the Extended Ultraviolet Disk of NGC 3344
Creators: name: Padave, Mansi
name: Borthakur, Sanchayeeta
name: Gim, Hansung B.
name: Jansen, Rolf A.
name: Thilker, David
name: Heckman, Timothy
name: Kennicutt, Robert C.
name: Momjian, Emmanuel
name: Fox, Andrew J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present our investigation of the Extended Ultraviolet (XUV) disk galaxy, NGC 3344, conducted as part of Deciphering the Interplay between the Interstellar medium, Stars, and the Circumgalactic medium (DIISC) survey. We use surface and aperture photometry of individual young stellar complexes to study star formation and its effect on the physical properties of the interstellar medium. We measure the specific star-formation rate (sSFR) and find it to increase from $\rm10^{-10} yr^{-1}$ in the inner disk to $\rm>10^{-8} yr^{-1}$ in the extended disk. This provides evidence for inside-out disk growth. If these sSFRs are maintained, the XUV disk stellar mass can double in $\sim$0.5 Gyr, suggesting a burst of star formation. The XUV disk will continue forming stars for a long time due to the high gas depletion times ($τ_{dep}$). The stellar complexes in the XUV disk have high-$Σ_{HI}$ and low-$Σ_{SFR}$ with $τ_{dep}\sim$10 Gyrs, marking the onset of a deviation from the traditional Kennicutt-Schmidt law. We find that both far-ultraviolet (FUV) and a combination of FUV and 24$μ$m effectively trace star formation in the XUV disk. H$α$ is weaker in general and prone to stochasticities in the formation of massive stars. Investigation of the circumgalactic medium at 29.5 kpc resulted in the detection of two absorbing systems with metal-line species: the stronger absorption component is consistent with gas flows around the disk, most likely tracing inflow, while the weaker component is likely tracing corotating circumgalactic gas.
description: 30 pages, 16 figures, accepted to ApJ
Quasi-Local Energy Flux of Spacetime Perturbation
Creators: name: Tung, Roh-Suan
name: Yu, Hoi-Lai
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A general expression for quasi-local energy flux for spacetime perturbation is derived from covariant Hamiltonian formulation using functional differentiability and symplectic structure invariance, which is independent of the choice of the canonical variables and the possible boundary terms one initially puts into the Lagrangian in the diffeomorphism invariant theories. The energy flux expression depends on a displacement vector field and the 2-surface under consideration. We apply and test the expression in Vaidya spacetime. At null infinity the expression leads to the Bondi type energy flux obtained by Lindquist, Schwartz and Misner. On dynamical horizons with a particular choice of the displacement vector, it gives the area balance law obtained by Ashtekar and Krishnan.
description: 8 pages, added appendix, version to appear in Phys. Rev. D
What can we learn from $B\to a_1(1260)(b_1(1235))π(K)$ decays?
Creators: name: Wang, Wei
name: Li, Run-Hui
name: Lü, Cai-Dian
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the $B\to a_1(1260)(b_1(1235))π(K)$ decays under the factorization scheme and find many discrepancies between theoretical predictions and the experimental data. In the tree dominated processes, large contributions from color-suppressed tree diagrams are required in order to accommodate with the large decay rates of $B^-\to a_1^0π^-$ and $B^-\to a_1^-π^0$. For $\bar B^0\to (a_1^+, b_1^+)K^-$ decays which are both induced by $b\to s$ transition, theoretical predictions on their decay rates are larger than the data by a factor of 2.8 and 5.5, respectively. Large electro-weak penguins or some new mechanism are expected to explain the branching ratios of $B^-\to b_1^0K^-$ and $B^-\to a_1^-\bar K^0$. The soft-collinear-effective-theory has the potential to explain large decay rates of $B^-\to a_1^0π^-$ and $B^-\to a_1^-π^0$ via a large hard-scattering form factor $ζ_J^{B\to a_1}$. We will also show that, with proper charming penguins, predictions on the branching ratios of $\bar B^0\to (a_1^+, b_1^+)K^-$ can also be consistent with the data.
description: 16 pages, no figure
VerificaRed
Creators: name: Homero Hinojosa, América Aidé Zamudio
Publisher: name: Zenodo
Year: 2021
Subjects: periodistas periodismo fake news noticias falsas fact checking verificación

description: Guía para formar e informar a periodistas de habla hispana en el tema de combate a la desinformación a través de la curación de contenidos, herramientas, cursos, talleres y eventos que brinden a los profesionales las habilidades para hacer fact-checking.
Increasing the emphasis on the child in the resolution of custody disputes
Creators: name: Strickland, Steven Andrew
Publisher: name: University of British Columbia
Year: 2010

description: The problem which is confronted in this paper is a perennial one; the resolution of child custody disputes. However, it is not the aim of the paper to provide a quick and easy solution, even if such were possible. Instead, it is contended that a much more satisfactory result can be achieved if there is more emphasis placed on the person who is the most affected by a court's decision, namely, the child himself. A detailed examination of the principles used in the traditional method of determining child placement indicates that there is a decided lack of input from the child. Unfortunately, the blame can be laid at the feet of not only the courts and the lawyers, but also legislatures and the public generally. Traditional methods of adjudication are employed without an appreciation of the special nature of the problem at hand. Fortunately though, the solution is not far away, and it is the major contention of this paper that a more effective use of the methods and proceedings already at our disposal will provide the input necessary to inform a decision on this most difficult of issues. The methods of providing input from the child can be divided into two categories. There can be either direct or indirect input. The former category comprises evidence from the child and interviews by the judge, while the latter consists of independent representation by legal counsel and the utilisation of behavioural scientists. These methods are examined in great depth, and guidelines are suggested, as well as pitfalls identified. Finally, as a concession to those who would chance the system of child placement entirely, this paper looks at suggested alternatives, but concludes that there is in fact no better system than one involving adjudication by a court, as long as the same becomes less parent orientated and more child orientated.
Are Copying and Innovation Enough?
Creators: name: Evans, T. S.
name: Plato, A. D. K.
name: You, T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: Exact analytic solutions and various numerical results for the rewiring of bipartite networks are discussed. An interpretation in terms of copying and innovation processes make this relevant in a wide variety of physical contexts. These include Urn models and Voter models, and our results are also relevant to some studies of Cultural Transmission, the Minority Game and some models of ecology.
description: Contribution to the proceedings of ECMI08, based on a talk given by A.D.K.Plato as part of the minisymposium on Mathematics and Social Networks. Includes appendix of supplementary material not in published version
Wave functions for high-symmetry, thin microstrip antennas and two-dimensional quantum boxes
Creators: name: Rain, Joseph R.
name: Cai, PeiYu
name: Baekey, Alexander
name: Reinhard, Matthew A.
name: Vasquez, Roman I.
name: Silverman, Andrew C.
name: Cain, Christopher L.
name: Klemm, Richard A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: For a spinless quantum particle in a one-dimensional box or an electromagnetic wave in a one-dimensional cavity, the respective Dirichlet and Neumann boundary conditions both lead to non-degenerate wave functions. However, in two spatial dimensions, the symmetry of the box or microstrip antenna is an important feature that has often been overlooked in the literature. In the high-symmetry cases of a disk, square, or equilateral triangle, the wave functions for each of those two boundary conditions are grouped into two distinct classes, which are one- and two-dimensional representations of the respective point groups, $C_{\infty v}$, $C_{4v}$, and $C_{3v}$. Here we present visualizations of representative wave functions for both boundary conditions and both one- and two-dimensional representations of those point groups. For the one-dimensional representations, color contour plots of the wave functions are presented. For the two-dimensional representations, the infinite degeneracies are presented as common nodal points and/or lines, the patterns of which are invariant under all operations of the respective point group. The wave functions with the Neumann boundary conditions have important consequences for the coherent terahertz emission from the intrinsic Josephson junctions in the high-temperature superconductor Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$: the enhancement of the output power from electromagnetic cavity resonances is only strong for wave functions that are not degenerate.
description: 18 pages, 23 figures
Quenched law of large numbers for branching Brownian motion in a random medium
Creators: name: Engländer, János
Publisher: name: arXiv
Year: 2008
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: We study a spatial branching model, where the underlying motion is $d$-dimensional ($d\ge1$) Brownian motion and the branching rate is affected by a random collection of reproduction suppressing sets dubbed mild obstacles. The main result of this paper is the quenched law of large numbers for the population for all $d\ge1$. We also show that the branching Brownian motion with mild obstacles spreads less quickly than ordinary branching Brownian motion by giving an upper estimate on its speed. When the underlying motion is an arbitrary diffusion process, we obtain a dichotomy for the quenched local growth that is independent of the Poissonian intensity. More general offspring distributions (beyond the dyadic one considered in the main theorems) as well as mild obstacle models for superprocesses are also discussed.
description: Published in at http://dx.doi.org/10.1214/07-AIHP155 the Annales de l'Institut Henri Poincar\'e - Probabilit\'es et Statistiques (http://www.imstat.org/aihp/) by the Institute of Mathematical Statistics (http://www.imstat.org)
The edge spectrum of Chern insulators with rough boundaries
Creators: name: Prodan, Emil
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Chern insulators are periodic band insulators with the property that their projector onto the occupied bands have non-zero Chern number. Chern insulator with a homogeneous boundary display continuum spectrum that fills the entire insulating gap. The local density of states corresponding to this part of the spectrum is localized near the boundary, hence the terminology edge spectrum. An interesting question arises, namely, if a rough boundary, which can be seen as a strong random potential acting on these quasi 1-dimensional states, would destroy the continuum edge spectrum. This paper shows how such question can be answered via a newly formulated abstract framework in which the expectation value of the current of a general observable is connected to the index of a specific Fredholm operator. For the present application, we will connect the expectation value of the charge edge current with the index of a Fredholm operator that remains invariant under arbitrary deformations of the boundary.
Geometric torsions and an Atiyah-style topological field theory
Creators: name: Korepanov, Igor
Publisher: name: arXiv
Year: 2008
Subjects: subject: Geometric Topology (math.GT)
subject: Algebraic Topology (math.AT)
subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics

description: The construction of invariants of three-dimensional manifolds with a triangulated boundary, proposed earlier by the author for the case when the boundary consists of not more than one connected component, is generalized to any number of components. These invariants are based on the torsion of acyclic complexes of geometric origin. The relevant tool for studying our invariants turns out to be F.A. Berezin's calculus of anti-commuting variables; in particular, they are used in the formulation of the main theorem of the paper, concerning the composition of invariants under a gluing of manifolds. We show that the theory obeys a natural modification of M. Atiyah's axioms for anti-commuting variables.
description: 15 pages, English translation (with minor corrections) of the Russian version. The latter is avaible here as v1