cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
QED in $\bar B \to \bar K \ell^+\ell^-$ LFU ratios: Theory versus Experiment, a Monte Carlo Study
Creators: name: Isidori, Gino
name: Lancerini, Davide
name: Nabeebaccus, Saad
name: Zwicky, Roman
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Using analytic results obtained in a meson effective theory, that includes all infrared sensitive logs, we build a dedicated Monte Carlo framework to describe QED corrections in $\bar B \to \bar K \ell^+\ell^-$ for a generic form factor. For the neutral mode $\bar B^0 \to \bar K^0 \ell^+\ell^-$, we perform a detailed numerical comparison versus those obtained with the general-purpose photon-shower tool PHOTOS. The comparison indicates a good agreement, at the few per-mil level, when focusing on the rare mode only. In addition, our framework allows us to investigate the impact of the charmonium resonances. Interference effects, not described by PHOTOS in the experimental analysis, are found to be small in the dilepton invariant mass region $q^2 < 6 \textrm{GeV}^2$, which is used to determine $R_{K^{(*)}}$. Using a semi-analytic framework we assess the full, rare and resonant, mode. Based thereupon, we discuss strategies to check the subtraction of the resonant mode, which has a sizeable impact at $q^2 \approx 6 \textrm{GeV}^2$ in the electron mode.
description: 23pp+refs, 9 Figs, version to appear in JHEP, using same number of subtractions in dispersion relation everywhere
A Semiparametric Bayesian Approach for Estimating the Gene Expression Distribution
Creators: name: Zou, Fei
name: Ibrahim, Joseph G.
name: Huang, Hanwen
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2010

description: Gene expression microarrays are powerful tools for global comparison and estimation of gene expression. Many microarray studies have demonstrated biologically plausible results with only a few arrays, leading to a mis-perception that a handful of hybridized arrays can always find something meaningful. From a statistical point of view, it is important to prospectively estimate required sample sizes prior to undertaking a microarray experiment. However, all sample size calculations need to directly or indirectly estimate the unknown distribution of the effect sizes of gene expression intensities. A parametric mixture model has been developed for relating the sample size directly to the false discovery rate (FDR), the most popular multiple comparison control criteria. In this paper,we extend the parametric mixture model and propose a robust semiparametric Dirichlet process mixture model, where the parametric distribution of gene expressions is no longer specified. This analysis is performed in a Bayesian inference framework using Markov chain Monte Carlo. The usefulness of the method is illustrated by simulations and a real murine lung study.
Spin evolution of massive fermion in QED plasma
Creators: name: Wang, Ziyue
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The dynamical evolution of spin of a massive probe fermion in a massless hot QED plasma at local equilibrium is investigated through the quantum kinetic theory. We consider the massive probe fermion undergoing 2-by-2 Coulomb scattering with the massless fermions in the medium. The axial kinetic equation is derived including the collision terms to the first order of gradients and leading logarithmic order of the coupling. The collision terms are vanishing at global equilibrium, around which the relaxation time can be extracted as an operator. We further decompose the axial kinetic equation into kinetic equations of axial-charge density as well as the transverse magnetic dipole moment, and illustrate the diffusion and polarization effect through preliminary numerical analysis.
description: 20 pages, 5 figures
Cluster Algebras and Scattering Diagrams, Part III. Cluster Scattering Diagrams
Creators: name: Nakanishi, Tomoki
Publisher: name: arXiv
Year: 2021
Subjects: subject: Combinatorics (math.CO)
subject: Mathematical Physics (math-ph)
subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: This is a self-contained exposition of several fundamental properties of cluster scattering diagrams introduced and studied by Gross, Hacking, Keel, and Kontsevich. In particular, detailed proofs are presented for the construction, the mutation invariance, and the positivity of theta functions of cluster scattering diagrams. Throughout the text we highlight the fundamental roles of the dilogarithm elements and the pentagon relation in cluster scattering diagrams.
description: v1: 95 pp; v2: 106 pp, Sec. 5.4, 6.7 added; v3: 106 pp, Def 1.1 corrected; v4: 108 pp, proof of Lemma 4.6 corrected, index added; v5: 110 pp; v6: 110 pp. This is the final manuscript of Part III of the monograph "Cluster Algebras and Scattering Diagrams'', MSJ Mem. 41 (2023) by the author
Analytical solutions for weak black hole kicks
Creators: name: Lingam, Manasvi
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The black hole is modeled by a combined gravitational potential of the bulge, disk and halo and is subjected to an initial weak kick. The resulting differential equations are set up, and shown to possess analytical solutions. The effects of black hole accretion and dynamical friction are also incorporated into this analytical framework. The resultant frequencies and amplitudes are computed, and are compared with the ones obtained from numerical simulations. Within the valid range of parameters of the analytical model, the two sets of results are shown to be in reasonable agreement. It is shown that this model reproduces the linear dependence of the amplitude on the initial kick velocity, and the constant of proportionality is close to that obtained from the simulations. The analytical treatment presented is quite general, and its applications to other areas are also indicated.
description: 11 pages, 3 figures, 1 table; accepted for publication in Astrophysics and Space Science
Developments since Kira 2.0
Creators: name: Lange, Fabian
name: Maierhöfer, Philipp
name: Usovitsch, Johann
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Last year we released version 2.0 of the Feynman integral reduction program Kira. In this contribution we first report on changes and new features since then and, secondly, on new features for upcoming releases.
Tweets vs. Mendeley readers: How do these two social media metrics differ?
Creators: name: Haustein, Stefanie
name: Larivière, Vincent
name: Thelwall, Mike
name: Amyot, Didier
name: Peters, Isabella
Publisher: name: arXiv
Year: 2014
Subjects: subject: Digital Libraries (cs.DL)
subject: FOS: Computer and information sciences

description: A set of 1.4 million biomedical papers was analyzed with regards to how often articles are mentioned on Twitter or saved by users on Mendeley. While Twitter is a microblogging platform used by a general audience to distribute information, Mendeley is a reference manager targeted at an academic user group to organize scholarly literature. Both platforms are used as sources for so-called altmetrics to measure a new kind of research impact. This analysis shows in how far they differ and compare to traditional citation impact metrics based on a large set of PubMed papers.
Characteristics of a Titanium Manganese redox flow battery based on Comsol
Creators: name: Saha, Anupam
name: Eskender, Shinthia Binte
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A simulation model and design of Titanium Manganese Redox Flow Battery (TMRFB) is proposed to study the distribution of dissociation rate, overpotential, current density, and electrode potential. TMRFB is one of the most promising new energy storages because of its high capacity and eco-friendly characteristics in the current condition of energy scarcity and environmental pollution. Moreover, Mn-based flow batteries are gaining popularity due to their inexpensive cost and high energy density in lieu of all vanadium redox flow batteries which are expensive. This research shows that the surface dissociation rate of Ti4+/ Ti3+ and Mn3+/Mn2+ ions are higher at the membrane and lower at the inlet where the velocity of the electrolyte flow is higher; Furthermore, our work reveals that when the thickness of the electrode is compressed from 4.5 mm to 3 mm, overpotential reduces whereas current density and electrode potential increases. The COMSOL Multiphysics software is used to solve the model's equations using the finite element approach. From the dissociation rate it is concluded that less potential is required at the membrane for the oxidation reduction reaction and with optimized electrolyte flow rate battery performance can be improved. Thus, electrode compression increases conductivity and battery performance.
description: Published on International Conference on Physics for Sustainable Development and Technology (ICPSDT-2022). arXiv admin note: text overlap with arXiv:2209.09872
Multi-Armed Bandits in Brain-Computer Interfaces
Creators: name: Heskebeck, Frida
name: Bergeling, Carolina
name: Bernhardsson, Bo
Publisher: name: arXiv
Year: 2022
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Human-Computer Interaction (cs.HC)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The multi-armed bandit (MAB) problem models a decision-maker that optimizes its actions based on current and acquired new knowledge to maximize its reward. This type of online decision is prominent in many procedures of Brain-Computer Interfaces (BCIs) and MAB has previously been used to investigate, e.g., what mental commands to use to optimize BCI performance. However, MAB optimization in the context of BCI is still relatively unexplored, even though it has the potential to improve BCI performance during both calibration and real-time implementation. Therefore, this review aims to further introduce MABs to the BCI community. The review includes a background on MAB problems and standard solution methods, and interpretations related to BCI systems. Moreover, it includes state-of-the-art concepts of MAB in BCI and suggestions for future research.
MPEC 2023-U205 : 2023 UG6
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 UG6

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.
The Galactic Position Dependence of Fast Radio Bursts and the Discovery of FRB 011025
Creators: name: Burke-Spolaor, S.
name: Bannister, K. W.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We report the detection of a dispersed Fast Radio Burst (FRB) in archival intermediate-latitude Parkes Radio Telescope data. The burst appears to be of the same physical origin as the four purported extragalactic FRBs reported by Thornton et al. (2013). This burst's arrival time precedes the Thornton et al.~bursts by ten years. We consider that this survey, and many other archival low-latitude (|gb|<30deg) pulsar surveys, have been searched for FRBs but produced fewer detections than the comparatively brief Thornton et al.~search. Such a rate dependence on Galactic position could provide critical supporting evidence for an extragalactic origin for FRBs. To test this, we form an analytic expression to account for Galactic position and survey setup in FRB rate predictions. Employing a sky temperature, scattering, and dispersion model of the Milky Way, we compute the expected number of FRBs if they are isotropically distributed on the sky w.r.t. Galactic position (i.e. local), and if they are of extragalactic origin. We demonstrate that the relative detection rates reject a local origin with a confidence of 99.96% (~3.6 sigma). The extragalactic predictions provide a better agreement, however are still strong discrepancies with the low-latitude detection rate at a confidence of 99.69% (~2.9 sigma). However, for the extragalactic population, the differences in predicted vs.~detected population may be accounted for by a number of factors, which we discuss.
description: 8 pages, 5 figures. Accepted to ApJ
PROBES-I: A Compendium of Deep Rotation Curves and Matched multiband Photometry
Creators: name: Stone, Connor
name: Courteau, Stephane
name: Arora, Nikhil
name: Frosst, Matthew
name: Jarrett, Thomas
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the Photometry and Rotation Curve Observations from Extragalactic Surveys (PROBES) compendium of extended rotation curves for 3163 late-type spirals, with matching homogeneous multiband photometry for 1677 of them. PROBES rotation curves originally extracted from Halpha long-slit spectra and aperture synthesis HI (21cm) velocity maps typically extend out to a median 2R_e (or 1R_{23.5, r}). Our uniform photometry takes advantage of GALEX, DESI-LIS, and WISE images and the software AutoProf to yield multiband azimuthally averaged surface brightness profiles that achieve depths greater than 25 mag/arcsec^2 (FUV, NUV), 27 mag/arcsec^2 (g, r), and 26 mag/arcsec^2 (z, W1, W2). With its library of spatially resolved profiles and an extensive table of structural parameters, the versatile PROBES data set will benefit studies of galaxy structure and formation.
description: 18 pages, 12 figures, Published in ApJS
Characterising the Apertif primary beam response
Creators: name: Dénes, H.
name: Hess, K. M.
name: Adams, E. A. K.
name: Kutkin, A.
name: Morganti, R.
name: van der Hulst, J. M.
name: Oosterloo, T. A.
name: Moss, V. A.
name: Adebahr, B.
name: de Blok, W. J. G.
name: Ivashina, M. V.
name: Coolen, A. H. W. M.
name: Damstra, S.
name: Hut, B.
name: Loose, G. M.
name: Lucero, D. M.
name: Maan, Y.
name: Mika, Á.
name: Norden, M. J.
name: Oostrum, L. C.
name: Pisano, D. J.
name: Smits, R.
name: van Cappellen, W. A.
name: Brink, R. van den
name: van der Schuur, D.
name: van Diepen, G. N. J.
name: van Leeuwen, J.
name: Vohl, D.
name: Wijnholds, S. J.
name: Ziemke, J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Context. Phased Array Feeds (PAFs) are multi element receivers in the focal plane of a telescope that make it possible to form simultaneously multiple beams on the sky by combining the complex gains of the individual antenna elements. Recently the Westerbork Synthesis Radio Telescope (WSRT) was upgraded with PAF receivers and carried out several observing programs including two imaging surveys and a time domain survey. The Apertif imaging surveys use a configuration, where 40 partially overlapping compound beams (CBs) are simultaneously formed on the sky and arranged in an approximately rectangular shape. Aims. This manuscript aims to characterise the response of the 40 Apertif CBs to create frequency-resolved, I, XX and YY polarization empirical beam shapes. The measured CB maps can be used for image deconvolution, primary beam correction and mosaicing of Apertif imaging data. Methods. We use drift scan measurements to measure the response of each of the 40 CBs of Apertif. We derive beam maps for all individual beams in I, XX and YY polarisation in 10 or 18 frequency bins over the same bandwidth as the Apertif imaging surveys. We sample the main lobe of the beams and the side lobes up to a radius of 0.6 degrees from the beam centres. In addition, we derive beam maps for each individual WSRT dish as well. Results. We present the frequency and time dependence of the beam shapes and sizes. We compare the compound beam shapes derived with the drift scan method to beam shapes derived with an independent method using a Gaussian Process Regression comparison between the Apertif continuum images and the NRAO VLA Sky Survey (NVSS) catalogue. We find a good agreement between the beam shapes derived with the two independent methods.
description: Accepted for publication by A&A, 14 pages, 15 figures
The Role of SARS-CoV-2 Testing on Hospitalizations in California
Creators: name: Montesinos-López, J. Cricelio
name: Daza-Torres, Maria L.
name: García, Yury E.
name: Barboza, Luis A.
name: Sanchez, Fabio
name: Schmidt, Alec J.
name: Pollock, Brad H.
name: Nuño, Miriam
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences
subject: G.3
subject: 62P10

description: The rapid spread of the new SARS-CoV-2 virus triggered a global health crisis disproportionately impacting people with pre-existing health conditions and particular demographic and socioeconomic characteristics. One of the main concerns of governments has been to avoid the overwhelm of health systems. For this reason, they have implemented a series of non-pharmaceutical measures to control the spread of the virus, with mass tests being one of the most effective control. To date, public health officials continue to promote some of these measures, mainly due to delays in mass vaccination and the emergence of new virus strains. In this study, we studied the association between COVID-19 positivity rate and hospitalization rates at the county level in California using a mixed linear model. The analysis was performed in the three waves of confirmed COVID-19 cases registered in the state to September 2021. Our findings suggest that test positivity rate is consistently associated with hospitalization rates at the county level for all waves of study. Demographic factors that seem to be related with higher hospitalization rates changed over time, as the profile of the pandemic impacted different fractions of the population in counties across California.
description: 17 pages, 6 figures
On Decoding of DVR-Based Linear Network Codes
Creators: name: Sun, Qifu Tyler
name: Li, Shuo-Yen Robert
Publisher: name: arXiv
Year: 2014
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: The conventional theory of linear network coding (LNC) is only over acyclic networks. Convolutional network coding (CNC) applies to all networks. It is also a form of LNC, but the linearity is w.r.t. the ring of rational power series rather than the field of data symbols. CNC has been generalized to LNC w.r.t. any discrete valuation ring (DVR) in order for flexibility in applications. For a causal DVR-based code, all possible source-generated messages form a free module, while incoming coding vectors to a receiver span the \emph{received submodule}. An existing \emph{time-invariant decoding} algorithm is at a delay equal to the largest valuation among all invariant factors of the received submodule. This intrinsic algebraic attribute is herein proved to be the optimal decoding delay. Meanwhile, \emph{time-variant decoding} is formulated. The meaning of time-invariant decoding delay gets a new interpretation through being a special case of the time-variant counterpart. The optimal delay turns out to be the same for time-variant decoding, but the decoding algorithm is more flexible in terms of decodability check and decoding matrix design. All results apply, in particular, to CNC.
Impact of LIGO-Virgo black hole binaries on gravitational wave background searches
Creators: name: Lewicki, Marek
name: Vaskonen, Ville
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the impact of the black hole binary population currently probed by LIGO-Virgo on future searches for the primordial gravitational wave background. We estimate the foreground generated by the binaries using the observed event rate and a simple modeling of the black hole population. We subtract individually resolvable binaries from the foreground and utilize Fisher analysis to derive sensitivity curves for power-law signals including these astrophysical foregrounds. Even with optimistic assumptions, we find that the reach of future experiments will be severely reduced.
description: 7 pages, 4 figures. Minor changes to match the published version
BPS M5-branes as Defects for the 3d-3d Correspondence
Creators: name: Bah, Ibrahima
name: Gabella, Maxime
name: Halmagyi, Nick
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Geometric Topology (math.GT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We study supersymmetric probe M5-branes in the AdS_4 solution that arises from M5-branes wrapped on a hyperbolic 3-manifold M_3. This amounts to introducing internal defects within the framework of the 3d-3d correspondence. The BPS condition for a probe M5-brane extending along all of AdS_4 requires it to wrap a surface embedded in an S^2-fibration over M_3. We find that the projection of this surface to M_3 can be either a geodesic or a tubular surface around a geodesic. These configurations preserve an extra U(1) symmetry, in addition to the one corresponding to the R-symmetry of the dual 3d N=2 gauge theory. BPS M2-branes can stretch between M5-branes wrapping geodesics. We interpret the addition of probe M5-branes on a closed geodesic in terms of conformal Dehn surgery.
description: 26 pages, 16 figures
Quantifying EPR: the resource theory of nonclassicality of common-cause assemblages
Creators: name: Zjawin, Beata
name: Schmid, David
name: Hoban, Matty J.
name: Sainz, Ana Belén
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Einstein-Podolsky-Rosen (EPR) steering is often (implicitly or explicitly) taken to be evidence for spooky action-at-a-distance. An alternative perspective on steering is that Alice has no causal influence on the physical state of Bob's system; rather, Alice merely updates her knowledge of the state of Bob's system by performing a measurement on a system correlated with his. In this work, we elaborate on this perspective (from which the very term 'steering' is seen to be inappropriate), and we are led to a resource-theoretic treatment of correlations in EPR scenarios. For both bipartite and multipartite scenarios, we develop the resulting resource theory, wherein the free operations are local operations and shared randomness (LOSR). We show that resource conversion under free operations in this paradigm can be evaluated with a single instance of a semidefinite program, making the problem numerically tractable. Moreover, we find that the structure of the pre-order of resources features interesting properties, such as infinite families of incomparable resources. In showing this, we derive new EPR resource monotones. We also discuss advantages of our approach over a pre-existing proposal for a resource theory of 'steering', and discuss how our approach sheds light on basic questions, such as which multipartite assemblages are classically explainable.
description: V2 changes: Accepted by Quantum, bibliography hyperlinks adjusted according to journal policy. New narrative in the introduction
A reduced-order, rotation-based model for thin hard-magnetic plates
Creators: name: Yan, Dong
name: Aymon, Bastien F. G.
name: Reis, Pedro M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We develop a reduced-order model for thin plates made of hard magnetorheological elastomers (hard-MREs), which are materials composed of hard-magnetic particles embedded in a polymeric matrix. First, we propose a new magnetic potential, as an alternative to an existing torque-based 3D continuum theory of hard-MREs, obtained by reformulating the remnant magnetization of a deformed hard-MRE body. Specifically, the magnetizations in the initial and current configurations are related by the rotation tensor decomposed from the deformation gradient, independently of stretching deformation. This description is motivated by recently reported observations in microscopic homogenization simulations. Then, we derive a 2D plate model through the dimensional reduction of our proposed rotation-based 3D theory. For comparison, we also provide a second plate model derived from the existing 3D theory. Finally, we perform precision experiments to thoroughly evaluate the proposed 3D and 2D models on hard-magnetic plates under various magnetic and mechanical loading conditions. We demonstrate that our rotation-based modification of the magnetic potential is crucial in correctly capturing the behavior of plates subjected to an applied field aligned with the magnetization, and undergoing in-plane stretching. In all the tested cases, our rotation-based 3D and 2D models yield predictions in excellent quantitative agreement with the experiments and can thus serve as predictive tools for the rational design of hard-magnetic plate structures.
Handleiding en ondersteunend materiaal voor de implementatie van het QualiTePE raamwerk en instrument
Creators: name: Slingerland, Menno
name: Borghouts, Lars
name: Crapa, Angelo
name: Herrmann, Christian
name: Langer, Wiebke
name: Gerlach, Erin
name: Cools, Wouter
name: Adamakis, Manolis
name: Costa, João
name: O´Brien, Wesley
name: Lemling, Alina
Publisher: name: Zenodo
Year: 2024

description: In een tijdperk van constante innovatie en verandering is streven naar kwaliteit en excellentie cruciaal. Het QualiTePE-raamwerk komt aan deze behoefte tegemoet biedt mogelijkheden om de kwaliteit van het onderwijzen van lichamelijke opvoeding (LO) te verbeteren.Dit handleiding is een praktische gids voor de implementatie van het QualiTePE-raamwerk en bijbehorend instrument, en helpt als zodanig om de dagelijkse onderwijspraktijk van de LO te verbeteren. Het biedt praktische inzichten, stapsgewijze begeleiding en ondersteuning om individuen, teams en organisaties in staat te stellen om de kwaliteit van lessen LO te verbeteren.
Modeling Neutron Star Matter in the Age of Multimessenger Astrophysics
Creators: name: Benhar, Omar
name: Lovato, Alessandro
name: Camelio, Giovanni
Publisher: name: arXiv
Year: 2022
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The interpretation of the available and forthcoming data obtained from multimessenger astrophysical observations -- potentially providing unprecedented access to neutron star properties -- will require the development of novel, accurate theoretical models of dense matter. Of great importance, in this context, will be the capability to devise a description of thermal effects applicable to the study of quantities other than the equation of state, such as the transport coefficients and the neutrino mean free path in the nuclear medium. The formalism based on correlated basis states and the cluster expansion technique has been previously employed to derive a well-behaved effective interaction -- suitable for use in standard perturbation theory -- from a state-of-the-art nuclear Hamiltonian, including phenomenological two- and three-nucleon potentials. Here, we provide a comprehensive and self-contained account of the extension of this approach to the treatment of finite-temperature effects, and report the results of numerical calculations of a number of properties of nuclear matter with arbitrary neutron excess and temperature up to 50 MeV.
description: 20 pages, 11 figures, typeset using aastex631
On the derivation of Darboux form for the action-angle dual of trigonometric BC(n) Sutherland system
Creators: name: Gorbe, T. F.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences
subject: 14H70, 37J15, 53D20

description: Recently Feher and the author have constructed the action-angle dual of the trigonometric BC(n) Sutherland system via Hamiltonian reduction. In this paper a reduction-based calculation is carried out to verify canonical Poisson bracket relations on the phase space of this dual model. Hence the material serves complementary purposes whilst it can also be regarded as a suitable modification of the hyperbolic case previously sorted out by Pusztai.
description: Contribution to the proceedings of the 22nd International Conference on Integrable Systems and Quantum Symmetries (ISQS-22, Prague, June 2014), 11 pages
Orbital motion near Sagittarius A* -- Constraints from polarimetric ALMA observations
Creators: name: Wielgus, Maciek
name: Moscibrodzka, Monika
name: Vos, Jesse
name: Gelles, Zachary
name: Marti-Vidal, Ivan
name: Farah, Joseph
name: Marchili, Nicola
name: Goddi, Ciriaco
name: Messias, Hugo
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report on the polarized light curves of the Galactic Center supermassive black hole Sagittarius A*, obtained at millimeter wavelength with the Atacama Large Millimeter/submillimeter Array (ALMA). The observations took place as a part of the Event Horizon Telescope campaign. We compare the observations taken during the low variability source state on 2017 Apr 6 and 7 with those taken immediately after the X-ray flare on 2017 Apr 11. For the latter case, we observe rotation of the electric vector position angle with a timescale of $\sim 70$ min. We interpret this rotation as a signature of the equatorial clockwise orbital motion of a hot spot embedded in a magnetic field dominated by a dynamically important vertical component, observed at a low inclination $\sim20^\circ$. The hot spot radiates strongly polarized synchrotron emission, briefly dominating the linear polarization measured by ALMA in the unresolved source. Our simple emission model captures the overall features of the polarized light curves remarkably well. Assuming a Keplerian orbit, we find the hot spot orbital radius to be $\sim$ 5 Schwarzschild radii. We observe hints of a positive black hole spin, that is, a prograde hot spot motion. Accounting for the rapidly varying rotation measure, we estimate the projected on-sky axis of the angular momentum of the hot spot to be $\sim 60^\circ$ east of north, with a 180$^\circ$ ambiguity. These results suggest that the accretion structure in Sgr A* is a magnetically arrested disk rotating clockwise.
Axial Chiral Vortical Effect in a Sphere with finite size effect
Creators: name: Yang, Shu-Yun
name: Fang, Ren-Hong
name: Hou, De-Fu
name: Ren, Hai-Cang
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate the axial vortical effect in a uniformly rotating sphere subject to finite size. We use MIT boundary condition to limit the boundary of the sphere. For massless fermions inside the sphere, we obtain the exact axial vector current far from the boundary that matches the expression obtained in cylindrical coordinates in the literature. On the spherical boundary, we find both the longitudinal and transverse(with respect to the rotation axis) components with magnitude depending on the colatitude angle. For massive fermions, we derive an expansion of the axial conductivity far from the boundary to all orders of mass whose leading order term agrees with the mass correction reported in the literature. We also obtain the leading order mass correction on the boundary which is linear, and stronger than the quadratic dependence far from the boundary. The qualitative implications on the phenomenology of heavy ion collisions are speculated.
description: 35 pages, 4 figures
Haplotype-Based Pharmacogenetic Analysis for Longitudinal Quantitative Traits in the Presence of Dropout
Creators: name: Tzengu2217, Jung-Ying
name: Farmen, Mark W.
name: Liu, Youfang
name: Luu2217, Wenbin
name: Sullivan, Patrick F.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2010

description: We propose a variety of methods based on the generalized estimation equations to address the issues encountered in haplotype-based pharmacogenetic analysis, including analysis of longitudinal data with outcome-dependent dropouts, and evaluation of the high-dimensional haplotype and haplotype-drug interaction effects in an overall manner. We use the inverse probability weights to handle the outcome-dependent dropouts under the missing-at-random assumption, and incorporate the weighted L1-penalty to select important main and interaction effects with high dimensionality. The proposed methods are easy to implement, computationally efficient, and provide an optimal balance between false positives and false negatives in detecting genetic effects.
Pion damping width and pion spectral function in hot pion gas
Creators: name: Goderidze, D.
name: Friesen, A.
name: Kalinovsky, Yu.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The temperature behaviour of the pion width in the hadronic phase is investigated in the framework of the NJL model. The contribution to the width from the pion-pion collision is considered with a scalar sigma-meson as an intermediate state. It is shown that the pion width significantly broadens at $T>0.1$ GeV. Using the two-step iteration method, suggested by Kadanoff and Baym, the pion spectral function in a hot pion gas is calculated at different temperatures.
description: 8 pages, 4 figures
Integrable deformations of the AdS$_5\times$S$^5$ superstring and the classical Yang-Baxter equation -- Towards the gravity/CYBE correspondence --
Creators: name: Matsumoto, Takuya
name: Yoshida, Kentaroh
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Based on the formulation of Yang-Baxter sigma models developed by Klimcik and Delduc-Magro-Vicedo, we explain that various deformations of type IIB superstring on AdS$_5\times$S$^5$ can be characterized by classical $r$-matrices satisfying the classical Yang-Baxter equation (CYBE). The relation may be referred to as `the gravity/CYBE correspondence.' We present non-trivial examples of the correspondence including Lunin-Maldacena backgrounds for $β$-deformations of the ${\cal N} = 4$ super Yang-Mills theory and the gravity duals for non-commutative gauge theories. We also discuss non-integrable backgrounds such as AdS$_5\times T^{1,1}$ as a generalization.
description: 17 pages; Submitted to the proceedings of `The XXIInd International Conference on Integrable Systems and Quantum Symmetries (ISQS-22),' Prague, June 23-29, 2014; Based on the talk presented by T.M
Validity of Bogoliubov's approximation for translation-invariant Bose gases
Creators: name: Brooks, Morris
name: Seiringer, Robert
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We verify Bogoliubov's approximation for translation invariant Bose gases in the mean field regime, i.e. we prove that the ground state energy $E_N$ is given by $E_N=Ne_\mathrm{H}+\inf σ\left(\mathbb{H}\right)+o_{N\rightarrow \infty}(1)$, where $N$ is the number of particles, $e_\mathrm{H}$ is the minimal Hartree energy and $\mathbb{H}$ is the Bogoliubov Hamiltonian. As an intermediate result we show the existence of approximate ground states $Ψ_N$, i.e. states satisfying $\langle H_N\rangle_{Ψ_N}=E_N+o_{N\rightarrow \infty}(1)$, exhibiting complete Bose--Einstein condensation with respect to one of the Hartree minimizers.
Defining, Evaluating, and Removing Bias Induced by Linear Imputation in Longitudinal Clinical Trials with MNAR Missing Data
Creators: name: Helms, Russell W.
name: Helms, Ronald W.
name: Reece, Laura Helms
name: Helms, Mary W.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2011

description: Missing not at random (MNAR) post-dropout missing data from a longitudinal clinical trial result in the collection of “biased data”, which leads to biased estimators and tests of corrupted hypotheses. In a full rank linear model analysis the model equation, E[Y] = Xβ, leads to the definition of the primary parameter β = (X′X)−1X′E[Y], and the definition of linear secondary parameters of the form θ = Lβ = L(X′X)−1X′E[Y], including for example, a parameter representing a “treatment effect”. These parameters depend explicitly on E[Y], which raises the questions: what is E[Y] when some elements of the incomplete random vector Y are not observed and MNAR, or when such a Y is “completed” via imputation? We develop a rigorous, readily interpretable definition of E[Y] in this context that leads directly to definitions of β,Bias(β^)=E[β^]−β,Bias(θ^)=E[θ^ ]−Lβ, and the extent of hypothesis corruption. These definitions provide a basis for evaluating, comparing, and removing biases induced by various linear imputation methods for MNAR incomplete data from longitudinal clinical trials. Linear imputation methods use earlier data from a subject to impute values for post-dropout missing values and include “Last Observation Carried Forward” (LOCF) and “Baseline Observation Carried Forward” (BOCF), among others. We illustrate the methods of evaluating, comparing, and removing biases and the effects of testing corresponding corrupted hypotheses via a hypothetical, but very realistic longitudinal analgesic clinical trial.
Travelling wave solutions of the reaction-diffusion mathematical model of glioblastoma growth: An Abel equation based approach
Creators: name: Harko, Tiberiu
name: Mak, M. K.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Tissues and Organs (q-bio.TO)
subject: Biological Physics (physics.bio-ph)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: We consider quasi-stationary (travelling wave type) solutions to a nonlinear reaction-diffusion equation with arbitrary, autonomous coefficients, describing the evolution of glioblastomas, aggressive primary brain tumors that are characterized by extensive infiltration into the brain and are highly resistant to treatment. The second order nonlinear equation describing the glioblastoma growth through travelling waves can be reduced to a first order Abel type equation. By using the integrability conditions for the Abel equation several classes of exact travelling wave solutions of the general reaction-diffusion equation that describes glioblastoma growth are obtained, corresponding to different forms of the product of the diffusion and reaction functions. The solutions are obtained by using the Chiellini lemma and the Lemke transformation, respectively, and the corresponding equations represent generalizations of the classical Fisher--Kolmogorov equation. The biological implications of two classes of solutions are also investigated by using both numerical and semi-analytical methods for realistic values of the biological parameters.
description: 29 pages, 4 figures, accepted for publication in Mathematical Biosciences and Engineering
Flexible Analytical Methods for Adding a Treatment Arm Mid-Study to an Ongoing Clinical Trial
Creators: name: Koch, Gary G.
name: Palesch, Yuko Y.
name: Elm, Jordan J.
name: Ravina, Bernard
name: Hinson, Vanessa
name: Zhao, Wenle
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2012

description: It is not uncommon to have experimental drugs under different stages of development for a given disease area. Methods are proposed for use when another treatment arm is to be added mid-study to an ongoing clinical trial. Monte Carlo simulation was used to compare potential analytical approaches for pairwise comparisons through a difference in means in independent normal populations including 1.) a linear model adjusting for the design change (stage effect), 2.) pooling data across the stages, or 3.) the use of an adaptive combination test. In the presence of intra-stage correlation (or a non-ignorable fixed stage effect), simply pooling the data will result in a loss of power and will inflate the type I error rate. The linear model approach is more powerful, but the adaptive methods allow for flexibility (re-estimating sample size). The flexibility to add a treatment arm to an ongoing trial may result in cost savings as treatments that become ready for testing can be added to ongoing studies.
Medical Records-Based Postmarketing Safety Evaluation of Rare Events with Uncertain Status
Creators: name: Mast, T. Christopher
name: Cao, Hongyuan
name: Heyse, Joseph F.
name: LaVange, Lisa M.
name: Kosorok, Michael R.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2013

description: We develop a simple statistic for comparing rates of rare adverse events between treatment groups in post-marketing safety studies where the events have uncertain status. In this setting, the statistic is asymptotically equivalent to the logrank statistic, but the limiting distribution has Poisson and binomial components instead of being Guassian. We develop two new procedures for computing critical values, a Gaussian approximation and a parametric bootstrap. Both numerical and asymptotic properties of the procedures are studied. The test procedures are demonstrated on a post-marketing safety study of the RotaTeq vaccine. This vaccine was developed to reduce the incidence of severe diarrhea in infants.
Windowed Green function method for wave scattering by periodic arrays of 2D obstacles
Creators: name: Strauszer-Caussade, Thomas
name: Faria, Luiz M.
name: Fernandez-Lado, Agustín
name: Pérez-Arancibia, Carlos
Publisher: name: arXiv
Year: 2022
Subjects: subject: Numerical Analysis (math.NA)
subject: Computational Physics (physics.comp-ph)
subject: Optics (physics.optics)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: This paper introduces a novel boundary integral equation (BIE) method for the numerical solution of problems of planewave scattering by periodic line arrays of two-dimensional penetrable obstacles. Our approach is built upon a direct BIE formulation that leverages the simplicity of the free-space Green function but in turn entails evaluation of integrals over the unit-cell boundaries. Such integrals are here treated via the window Green function method. The windowing approximation together with a finite-rank operator correction -- used to properly impose the Rayleigh radiation condition -- yield a robust second-kind BIE that produces super-algebraically convergent solutions throughout the spectrum, including at the challenging Rayleigh-Wood anomalies. The corrected windowed BIE can be discretized by means of off-the-shelf Nyström and boundary element methods, and it leads to linear systems suitable for iterative linear-algebra solvers as well as standard fast matrix-vector product algorithms. A variety of numerical examples demonstrate the accuracy and robustness of the proposed methodology
Priročnik in navodila za uporabo modela in digitalnega orodja QualiTePE
Creators: name: Jurak, Gregor
name: Sember, Vedrana
name: Crapa, Angelo
name: Langer, Wiebke
name: Herrmann, Christian
name: Gerlach, Erin
name: Cools, Wouter
name: Adamakis, Manolis
name: Slingerland, Menno
name: Borghouts, Lars
name: Costa, João
name: O'Brien, Wesley
name: Lemling, Alina
Publisher: name: Zenodo
Year: 2024

description: V dobi nenehnih inovacij in sprememb je prizadevanje za kakovost in izvrstnost postalo ključnega pomena. Model QualiTePE se odziva na te sodobne potrebe, saj ponuja celovit pristop k izboljšanju kakovosti poučevanja športne vzgoje (ŠVZ).

Ta priročnik je praktični vodnik za uresničevanje modela in uporabo digitalnega orodja QualiTePE (aplikacije), ki pomaga izboljšati vsakodnevne prakse poučevanja. Poenostavlja zapleten proces kakovostne športne vzgoje ter ponuja praktične vpoglede, navodila po korakih in podporo posameznikom, skupinam in organizacijam pri doseganju odličnosti pri pouku ŠVZ.
Efficient Gaussian Sampling for Solving Large-Scale Inverse Problems using MCMC Methods
Creators: name: Gilavert, Clément
name: Moussaoui, Saïd
name: Idier, Jérôme
Publisher: name: arXiv
Year: 2014
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences
subject: 15A29, 62F15, 65C05, 65C40, 68U10, 94A08, 94A12

description: The resolution of many large-scale inverse problems using MCMC methods requires a step of drawing samples from a high dimensional Gaussian distribution. While direct Gaussian sampling techniques, such as those based on Cholesky factorization, induce an excessive numerical complexity and memory requirement, sequential coordinate sampling methods present a low rate of convergence. Based on the reversible jump Markov chain framework, this paper proposes an efficient Gaussian sampling algorithm having a reduced computation cost and memory usage. The main feature of the algorithm is to perform an approximate resolution of a linear system with a truncation level adjusted using a self-tuning adaptive scheme allowing to achieve the minimal computation cost. The connection between this algorithm and some existing strategies is discussed and its efficiency is illustrated on a linear inverse problem of image resolution enhancement.
description: 20 pages, 10 figures, under review for journal publication