cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Low-energy cutoffs in electron spectra of solar flares: statistical survey
Creators: name: Kontar, E. P.
name: Dickson, E.
name: Kasparova, J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The Ramaty High Energy Solar Spectroscopic Imager (RHESSI) X-ray data base (February 2002 -- May 2006) has been searched to find solar flares with weak thermal components and flat photon spectra. Using a regularised inversion technique, we determine the mean electron flux distribution from count spectra of a selection of events with flat photon spectra in the 15--20 keV energy range. Such spectral behaviour is expected for photon spectra either affected by photospheric albedo or produced by electron spectra with an absence of electrons in a given energy range, e.g. a low-energy cutoff in the mean electron spectra of non-themal particles. We have found 18 cases which exhibit a statistically significant local minimum (a dip) in the range of 10--20 keV. The positions and spectral indices of events with low-energy cutoff indicate that such features are likely to be the result of photospheric albedo. It is shown that if the isotropic albedo correction was applied, all low-energy cutoffs in the mean electron spectrum were removed and hence the low energy cutoffs in the mean electron spectrum of solar flares above $\sim$12 keV cannot be viewed as real features in the electron spectrum. If low-energy cutoffs exist in the mean electron spectra, the energy of low energy cutoffs should be less than $\sim$12 keV.
description: 9 pages, 5 figures, submitted to Solar Physics
The thermodynamics for a hadronic gas of fireballs with internal color structures and chiral fields
Creators: name: Zakout, Ismail
name: Greiner, Carsten
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The thermodynamical partition function for a gas of color-singlet bags consisting of fundamental and adjoint particles in both $U(N_c)$ and $SU(N_c)$ group representations is reviewed in detail. The constituent particle species are assumed to satisfy various thermodynamical statistics. The gas of bags is probed to study the phase transition for a nuclear matter in the extreme conditions. These bags are interpreted as the Hagedorn states and they are the highly excited hadronic states which are produced below the phase transition point to the quark-gluon plasma. The hadronic density of states has the Gross-Witten critical point and exhibits a third order phase transition from a hadronic phase dominated by the discrete low-lying hadronic mass spectrum particles to another hadronic phase dominated by the continuous Hagedorn states. The Hagedorn threshold production is found just above the highest known experimental discrete low-lying hadronic mass spectrum. The subsequent Hagedorn phase undergoes a first order deconfinement phase transition to an explosive quark-gluon plasma. The role of the chiral phase transition in the phases of the discrete low-lying mass spectrum and the continuous Hagedorn mass spectrum is also considered. It is found crucial in the phase transition diagram. Alternate scenarios are briefly discussed for the Hagedorn gas undergoes a higher order phase transition through multi-processes of internal color-flavor structure modification.
description: 110 pages and 13 figures. Added references to the introduction
Entanglement of Quantum Fluctuations in the Inflationary Universe
Creators: name: Nambu, Yasusada
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate quantum entanglement of a scalar field in the inflationary universe. By introducing a bipartite system using a lattice model of scalar field, we apply the separability criterion based on the partial transpose operation and numerically calculate the bipartite entanglement between separate spatial regions. We find that the initial entangled state becomes separable or dis-entangled when the size of the spatial regions exceed the Hubble horizon. This is necessary condition for the appearance of classicality of the quantum fluctuation. We further investigate the condition for the appearance of the classical distribution function and find that the condition is given by the inequality for the symplectic eigenvalue of the covariance matrix of the scalar field.
description: 19 pages, 5 figures, final version to appear in Phys. Rev. D
A new calibration method for charm jet identification validated with proton-proton collision events at $\sqrt{s}$ =13 TeV
Creators: name: CMS Collaboration
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2021
Subjects: p p, scattering
gluon, jet
heavy quark, jet
jet, charm
jet, bottom
calibration
TeV
sensitivity
quark
CERN LHC Coll
flavor
CMS

description: Many measurements at the LHC require efficient identification of heavy-flavour jets, i.e., jets originating from bottom (b) or charm (c) quarks. An overview of the algorithms used to identify c jets is described and a novel method to calibrate them is presented. This new method adjusts the entire distributions of the outputs obtained when the algorithms are applied to jets of different flavours. It is based on an iterative approach exploiting three distinct control regions that are enriched with either b jets, c jets, or light-flavour and gluon jets. Results are presented in the form of correction factors evaluated using proton-proton collision data with an integrated luminosity of 41.5 fb$^{-1}$ at $\sqrt{s}$ = 13 TeV, collected by the CMS experiment in 2017. The closure of the method is tested by applying the measured correction factors on simulated data sets and checking the agreement between the adjusted simulation and collision data. Furthermore, a validation is performed by testing the method on pseudodata, which emulate different miscalibration conditions. The calibrated results enable the use of the full distributions of heavy-flavour identification algorithm outputs, e.g. as inputs to machine-learning models. Thus, they are expected to increase the sensitivity of future physics analyses.
Physics of collisionless phase mixing
Creators: name: Tsiklauri, D.
name: Haruki, T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Previous studies of phase mixing of ion cyclotron (IC), Alfvénic, waves in the collisionless regime have established the generation of parallel electric field and hence acceleration of electrons in the regions of transverse density inhomogeneity. However, outstanding issues were left open. Here we use 2.5D, relativistic, fully electromagnetic PIC (Particle-In-Cell) code and an analytic MHD (Magnetohydrodynamic) formulation, to establish the following points: (i) Using the generalised Ohm's law we find that the parallel electric field is supported mostly by the electron pressure tensor, with a smaller contribution from the electron inertia term. (ii) The generated parallel electric field and the fraction of accelerated electrons are independent of the IC wave frequency remaining at a level of six orders of magnitude larger than the Dreicer value and approximately 20% respectively. The generated parallel electric field and the fraction of accelerated electrons increase with the increase of IC wave amplitude. The generated parallel electric field seems to be independent of plasma beta, while the fraction of accelerated electrons strongly increases with the decrease of plasma beta (for plasma beta of 0.0001 the fraction of accelerated electrons can be as large as 47%). (iii) In the collisionless regime IC wave dissipation length (that is defined as the distance over which the wave damps) variation with the driving frequency shows a deviation from the analytical MHD result, which we attribute to a possible frequency dependence of the effective resistivity. (iv) Effective anomalous resistivity, inferred from our numerical simulations, is at least four orders of magnitude larger than the classical Spitzer value.
description: Final version, accepted for publication in Physics of Plasmas
Inclusive and differential cross section measurements of single top quark production in association with a Z boson in proton-proton collisions at $\sqrt{s}$ = 13 TeV
Creators: name: CMS Collaboration
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2021
Subjects: top, production
p p, scattering
spin, asymmetry
antiquark, production
top, polarization
top, decay
parton
differential cross section
TeV
muon
dilepton
GeV
initial state
CMS
lepton
electron
kinematics

description: Inclusive and differential cross sections of single top quark production in association with a Z boson are measured in proton-proton collisions at a center-of-mass energy of 13 TeV with a data sample corresponding to an integrated luminosity of 138 fb$^{-1}$ recorded by the CMS experiment. Events are selected based on the presence of three leptons, electrons or muons, associated with leptonic Z boson and top quark decays. The measurement yields an inclusive cross section of 87.9$_{-7.3}^{+7.5}$ (stat) $_{-6.0}^{+7.3}$ (syst) fb for a dilepton invariant mass greater than 30 GeV, in agreement with standard model (SM) calculations and the most precise determination to date. The ratio between the cross sections for the top quark and the top antiquark production in association with a Z boson is measured as 2.37$_{-0.42}^{+0.56}$ (stat) ${}_{-0.13}^{+0.27}$ (syst). Differential measurements at parton and particle levels are performed for the first time. Several kinematic observables are considered to study the modeling of the process. Results are compared to theoretical predictions with different assumptions on the source of the initial-state b quark and found to be in agreement, within the uncertainties. Additionally, the spin asymmetry, which is sensitive to the top quark polarization, is determined from the differential distribution of the polarization angle at parton level to be 0.54 $\pm$ 0.16 (stat) $\pm$ 0.06 (syst), in agreement with SM predictions.
Representing epistemological and disciplinary diversity in open research discourse
Creators: name: Hsing, Pen-Yuan
name: Johns, Brianna
Publisher: name: Zenodo
Year: 2025
Subjects: epistemic diversity
diversity and inclusion
disciplinary diversity
epistemology
open research
open science
philosophy of science
science and technology studies

description: On 10 February 2024, I gave a lightning talk at FOSDEM 2024's Open Research Online Devroom titled “Representing epistemological and disciplinary diversity in open research discourse”. It was informed by incredible feedback I received from various open research communities. There's so much good material I couldn't fit them into a 10-minute lightning talk.

So, in addition to publishing the slides here, the transcript and additional materials/reading are published here: 

https://write.as/naclscrg/epistemic-and-disciplinary-diversity

Later, on 31 March 2025, I gave a slightly tweaked version of this talk to introduce an online workshop on "Baking In Disciplinary and Epistemic Diversity in Open Research Training" for the UK Reproducibility Network train-the-trainer network. The video recording of this version is included here in the MP4 file and also viewable on the Internet Archive: 

https://archive.org/details/baking-in-disciplinary-and-epistemic-diversity-2025-03-31 
description: About the slides

The open source font Metropolis (https://fontlibrary.org/en/font/metropolis) is embedded in the attached presentation slides, which are saved with Microsoft® PowerPoint® LTSC 2021 (version 2108 build 16.0.14332.20621) in the OOXML Strict format (file extension .pptx). Users of other presentation software might need to install the font in their system before successfully opening and remixing this presentation. The transcript for each slide is in their presenter notes.

About the video

The video recording in the file `Baking in disciplinary and epistemic diversity in open research training 2025-03-31.mp4` is encoded in H.264 (video) and AAC (audio). Note that the font used in this version is Atkinson Hyperlegible Next.
Representing epistemological and disciplinary diversity in open research discourse
Creators: name: Hsing, Pen-Yuan
name: Johns, Brianna
Publisher: name: Zenodo
Year: 2024

description: On 10 February 2024, I gave a lightning talk at FOSDEM 2024's Open Research Online Devroom titled “Representing epistemological and disciplinary diversity in open research discourse”. It was informed by incredible feedback I received from various open research communities. There's so much good material I couldn't fit them into a 10-minute lightning talk.

So, in addition to publishing the slides here, the transcript and additional materials/reading are published here: 

https://write.as/naclscrg/epistemic-and-disciplinary-diversity
description: The open source font Metropolis (https://fontlibrary.org/en/font/metropolis) is embedded in the attached presentation slides, which are saved with Microsoft® PowerPoint® LTSC 2021 (version 2108 build 16.0.14332.20621) in the OOXML Strict format (file extension .pptx). Users of other presentation software might need to install the font in their system before successfully opening and remixing this presentation. The transcript for each slide is in their presenter notes.
Shock-induced cavitation and wavefront analysis inside a water droplet
Creators: name: Biasiori-Poulanges, Luc
name: El-Rabii, Hazem
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The objective of the present study is to develop a basic understanding of the interaction of shock waves with density inhomogeneities. We consider here the particular instance of a planar air shock impinging on a spherical water-droplet and discuss to what extent this interaction can lead to the inception of cavitation inside the droplet. The effort centers on the early phases of the interaction process during which the geometry and amplitude of the propagating wavefront is modified by refraction and the subsequent internal reflections at the droplet interface. The problem is analysed using both simple ray theory and a 2-D multiphase, compressible hydrodynamic code (ECOGEN). Within the context of ray theory, the occurrence of focusing is examined in details and parametric equations are derived for the transmitted wavefront and its multiple internal reflections. It is found that wave patterns predicted by ray calculations compare extremely well with the more accurate numerical solutions from simulations. In particular, it is shown that the internal wavefront assumes a complex time-dependent shape whose dominant feature is the existence of cusp singularities. These singular points are shown to trace out surfaces that are the caustics of the associated system of rays. From the singularities of the energy flux density of the refracted wave, the parametric equations of the caustic surface associated to the $k$-th reflected wavefront are deduced. As a consequence of the focusing process, the simulations show the formation of negative-pressure regions in the internal flow field. These low-pressure zones are identified as possible spots where cavitation may occur, depending on the magnitude of the pressure reached. Finally, the numerical results provide quantitative information on the dependence of negative pressure peak upon incident-shock-wave strength.
description: 18 pages, 8 figures
Graph spectra as a systematic tool in computational biology
Creators: name: Banerjee, Anirban
name: Jost, Jürgen
Publisher: name: arXiv
Year: 2007
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: We present the spectrum of the (normalized) graph Laplacian as a systematic tool for the investigation of networks, and we describe basic properties of eigenvalues and eigenfunctions. Processes of graph formation like motif joining or duplication leave characteristic traces in the spectrum. This can suggest hypotheses about the evolution of a graph representing biological data. To this data, we analyze several biological networks in terms of rough qualitative data of their spectra.
description: 12 pages, 3 figures, Discrete Applied Mathematics, to appear
Spontaneous generation of persistent activity in diffusively coupled cellular assemblies
Creators: name: Ghosh, Ria
name: Menon, Shakti N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Tissues and Organs (q-bio.TO)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: The spontaneous generation of electrical activity underpins a number of essential physiological processes, and is observed even in tissues where specialized pacemaker cells have not been identified. The emergence of periodic oscillations in diffusively coupled assemblies of excitable and electrically passive cells (which are individually incapable of sustaining autonomous activity) has been suggested as a possible mechanism underlying such phenomena. In this paper we investigate the dynamics of such assemblies in more detail by considering simple motifs of coupled electrically active and passive cells. The resulting behavior encompasses a wide range of dynamical phenomena, including chaos. However, embedding such assemblies in a lattice yields spatio-temporal patterns that either correspond to a quiescent state or partial/globally synchronized oscillations. The resulting reduction in dynamical complexity suggests an emergent simplicity in the collective dynamics of such large, spatially extended systems. Furthermore, we show that such patterns can be reproduced by a reduced model comprising only excitatory and oscillatory elements. Our results suggest a generalization of the mechanism by which periodic activity can emerge in a heterogeneous system comprising non-oscillatory elements by coupling them diffusively, provided their steady states in isolation are sufficiently dissimilar.
description: 6 pages, 3 figures + 6 pages Supplementary Information
On orthogonal and special orthogonal invariants of a single matrix of small order
Creators: name: Djokovic, Dragomir Z.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Commutative Algebra (math.AC)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 13A50; 14L35;

description: We study the structure of the algebra of polynomial invariants for the usual conjugation action of the complex special, SO_n, and general, O_n, orthogonal group on the space of traceless n by n complex matrices. (Note that these two algebras coincide if n is odd.) Minimal generating sets of these algebras are known for n less than 5. We construct one for n=5. We also construct a Hironaka decomposition in the case n=3 and a new (more economical) such decomposition for n=4. A simple presentation (with just one syzygy) is obtained for the algebra in the case n=3.
description: 13 pages, 3 tables, no figures. Four misprints in Section 2 corrected. The paper will appear in "Linear and Multilinear Algebra"
髓核单细胞测序
Creators: name: 张亦然(Yiran Zhang)
Publisher: name: CNGB
Year: 2022
Subjects: Raw sequence reads
Transcriptome or Gene expression
Monoisolate
Medical

description: 利用单细胞测序技术对发生椎间盘退变病人的髓核组织进行亚群分辨，功能聚类以及信号通路富集化分析研究
Representing epistemological and disciplinary diversity in open research discourse
Creators: name: Hsing, Pen-Yuan
name: Johns, Brianna
Publisher: name: Zenodo
Year: 2024
Subjects: epistemic diversity
diversity and inclusion
disciplinary diversity
epistemology
open research
open science
philosophy of science
science and technology studies

description: On 10 February 2024, I gave a lightning talk at FOSDEM 2024's Open Research Online Devroom titled “Representing epistemological and disciplinary diversity in open research discourse”. It was informed by incredible feedback I received from various open research communities. There's so much good material I couldn't fit them into a 10-minute lightning talk.

So, in addition to publishing the slides here, the transcript and additional materials/reading are published here: 

https://write.as/naclscrg/epistemic-and-disciplinary-diversity
description: The open source font Metropolis (https://fontlibrary.org/en/font/metropolis) is embedded in the attached presentation slides, which are saved with Microsoft® PowerPoint® LTSC 2021 (version 2108 build 16.0.14332.20621) in the OOXML Strict format (file extension .pptx). Users of other presentation software might need to install the font in their system before successfully opening and remixing this presentation. The transcript for each slide is in their presenter notes.
Improving Wang-Landau sampling with adaptive windows
Creators: name: Cunha-Netto, A. G.
name: Caparica, A. A.
name: Tsai, Shan-Ho
name: Dickman, Ronald
name: Landau, D. P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Wang-Landau sampling (WLS) of large systems requires dividing the energy range into "windows" and joining the results of simulations in each window. The resulting density of states (and associated thermodynamic functions) are shown to suffer from boundary effects in simulations of lattice polymers and the five-state Potts model. Here, we implement WLS using adaptive windows. Instead of defining fixed energy windows (or windows in the energy-magnetization plane for the Potts model), the boundary positions depend on the set of energy values on which the histogram is flat at a given stage of the simulation. Shifting the windows each time the modification factor f is reduced, we eliminate border effects that arise in simulations using fixed windows. Adaptive windows extend significantly the range of system sizes that may be studied reliably using WLS.
Comparison of mathematical models equilibrium moisture content for sheet rubber
Creators: name: Wasan Jeentada
name: Thossaporn Chankrachang
name: Sutep Chooklin
name: Chalerm Sirirak
Publisher: name: Faculty of Engineering, Khon Kaen Univeristy
Year: 2012
Subjects: Mathematical model,Equilibrium moisture content,Sheet rubber

description: 1, 39, KKU Engineering Journal
Gravity in the 3+1-Split Formalism I: Holography as an Initial Value Problem
Creators: name: Mansi, Diego S.
name: Petkou, Anastasios C.
name: Tagliabue, Giovanni
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present a detailed analysis of the 3+1-split formalism of gravity in the presence of a cosmological constant. The formalism helps revealing the intimate connection between holography and the initial value formulation of gravity. We show that the various methods of holographic subtraction of divergences correspond just to different transformations of the canonical variables, such that the initial value problem is properly set up at the boundary. The renormalized boundary energy momentum tensor is a component of the Weyl tensor.
description: 28 pages; v2: minor improvements, references added
Three-loop results in HQET
Creators: name: Grozin, A. G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Recent results and methods of three-loop calculations in HQET are reviewed.
description: Talk at Loops and Legs 2008
ศึกษาผลของ Ribosomal protein L10a ต่อการพัฒนารังไข่ในกุ้งแชบ๊วย (Effect  of  Ribosomal  Protein  L10a  on Ovarian Development  of White Shrimp:
Fenneropenaeus merguiensis de Man)
Creators: name: นฤมล ขุนจันทร์
Publisher: name: Genetics Society of Thailand
Year: 2013
Subjects: RPL10a, SOP, TCTP, ovary, real-time PCR

description: S1 (Special Issue 1), S.1, Thai Journal of Genetics
Gravity in the 3+1-Split Formalism II: Self-Duality and the Emergence of the Gravitational Chern-Simons in the Boundary
Creators: name: Mansi, Diego S.
name: Petkou, Anastasios C.
name: Tagliabue, Giovanni
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study self-duality in the context of the 3+1-split formalism of gravity with non-zero cosmological constant. Lorentzian self-dual configurations are conformally flat spacetimes and have boundary data determined by classical solutions of the three-dimensional gravitational Chern-Simons. For Euclidean self-dual configurations, the relationship between their boundary initial positions and initial velocity is also determined by the three-dimensional gravitational Chern-Simons. Our results imply that bulk self-dual configurations are holographically described by the gravitational Chern-Simons theory which can either viewed as a boundary generating functional or as a boundary effective action.
description: 25 pages; v2: minor improvements, references added
Genetic Variability and Character Association Studies in F4 Population of Brinjal
Creators: name: Poornima Sajjan, T. S.
name: Devaraju
Publisher: name: Zenodo
Year: 2021
Subjects: Brinjal
Genetic Variability
Correlation
Path Coefficient
Yield

description: Brinjal (Solanum melongena L.) is popular among people of all social strata and hence, it is rightly called as vegetable of masses.
 In the face of increasing population, there is a need to develop new superior eggplant varieties or hybrids to increase production and
 productivity levels in brinjal. An improvement in yield and quality of brinjal is normally achieved by selecting the genotypes with desirable character combination existing in nature or by hybridization. Hence, the practical utility of the present investigation is to assess the level of variability spectrum present in F4 population and to study the association of various characters and their direct and indirect effects total yield per plant.
Tuning the fragility of a glassforming liquid by curving space
Creators: name: Sausset, François
name: Tarjus, Gilles
name: Viot, Pascal
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We investigate the influence of space curvature, and of the associated "frustration", on the dynamics of a model glassformer: a monatomic liquid on the hyperbolic plane. We find that the system's fragility, i.e. the sensitivity of the relaxation time to temperature changes, increases as one decreases the frustration. As a result, curving space provides a way to tune fragility and make it as large as wanted. We also show that the nature of the emerging "dynamic heterogeneities", another distinctive feature of slowly relaxing systems, is directly connected to the presence of frustration-induced topological defects.
description: 4 pages, 3 figures
A New Template Family For The Detection Of Gravitational Waves From Comparable Mass Black Hole Binaries
Creators: name: Porter, Edward K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In order to improve the phasing of the comparable-mass waveform as we approach the last stable orbit for a system, various re-summation methods have been used to improve the standard post-Newtonian waveforms. In this work we present a new family of templates for the detection of gravitational waves from the inspiral of two comparable-mass black hole binaries. These new adiabatic templates are based on re-expressing the derivative of the binding energy and the gravitational wave flux functions in terms of shifted Chebyshev polynomials. The Chebyshev polynomials are a useful tool in numerical methods as they display the fastest convergence of any of the orthogonal polynomials. In this case they are also particularly useful as they eliminate one of the features that plagues the post-Newtonian expansion. The Chebyshev binding energy now has information at all post-Newtonian orders, compared to the post-Newtonian templates which only have information at full integer orders. In this work, we compare both the post-Newtonian and Chebyshev templates against a fiducially exact waveform. This waveform is constructed from a hybrid method of using the test-mass results combined with the mass dependent parts of the post-Newtonian expansions for the binding energy and flux functions. Our results show that the Chebyshev templates achieve extremely high fitting factors at all PN orders and provide excellent parameter extraction. We also show that this new template family has a faster Cauchy convergence, gives a better prediction of the position of the Last Stable Orbit and in general recovers higher Signal-to-Noise ratios than the post-Newtonian templates.
description: Final published version. Accepted for publication in Phys. Rev. D
Blackbody radiation shift in a 43Ca+ ion optical frequency standard
Creators: name: Arora, Bindiya
name: Safronova, M. S.
name: Clark, Charles W.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Motivated by the prospect of an optical frequency standard based on 43Ca+, we calculate the blackbody radiation (BBR) shift of the 4s_1/2-3d_5/2 clock transition, which is a major component of the uncertainty budget. The calculations are based on the relativistic all-order single-double method where all single and double excitations of the Dirac-Fock wave function are included to all orders of perturbation theory. Additional calculations are conducted for the dominant contributions in order to evaluate some omitted high-order corrections and estimate the uncertainties of the final results. The BBR shift obtained for this transition is 0.38(1) Hz. The tensor polarizability of the 3d_5/2 level is also calculated and its uncertainty is evaluated as well. Our results are compared with other calculations.
description: 4 pages
Role of backflow correlations for the non-magnetic phase of the t-t' Hubbard model
Creators: name: Tocchio, Luca F.
name: Becca, Federico
name: Parola, Alberto
name: Sorella, Sandro
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We introduce an efficient way to improve the accuracy of projected wave functions, widely used to study the two-dimensional Hubbard model. Taking the clue from the backflow contribution, whose relevance has been emphasized for various interacting systems on the continuum, we consider many-body correlations to construct a suitable approximation for the ground state at intermediate and strong couplings. In particular, we study the phase diagram of the frustrated $t{-}t^\prime$ Hubbard model on the square lattice and show that, thanks to backflow correlations, an insulating and non-magnetic phase can be stabilized at strong coupling and sufficiently large frustrating ratio $t^\prime/t$.
description: 5 pages, 4 figures
Magnetic Fields In Astrophysical Objects
Creators: name: Silvers, L. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Magnetic fields are known to reside in many astrophysical objects and are now believed to be crucially important for the creation of phenomena on a wide variety of scales. However, the role of the magnetic field in the bodies that we observe has not always been clear. In certain situations, the importance of a magnetic field has been over looked on the grounds that the large-scale magnetic field was believed to be too weak to play and important role in the dynamics. In this article I discuss some of the recent developments concerning magnetic fields in stars, planets and accretion discs. I choose to emphasise some of the situations where it has been suggested that weak magnetic fields may play a more significant role than previously thought. At the end of the article I list some of the questions to be answered in the future.
description: 11 pages, 5 figures, to appear in Phil. Trans. A
3D MHD astrospheres: applications to IRC-10414 and Betelgeuse
Creators: name: Meyer, D. M. -A.
name: Mignone, A.
name: Petrov, M.
name: Scherer, K.
name: Velazquez, P. F.
name: Boumis, P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: A significative fraction of all massive stars in the Milky Way move supersonically through their local interstellar medium (ISM), producing bow shock nebulae by wind-ISM interaction. The stability of these observed astrospheres around cool massive stars challenges precedent two-dimensional (magneto-)hydrodynamical simulations of their surroundings. We present three-dimensional magneto-hydrodynamical (3D MHD) simulations of the circumstellar medium of runaway M-type red supergiant stars moving with velocity v_star= 50 km/s. We treat the stellar wind with a Parker spiral and assume a 7 microG magnetisation of the ISM. Our free parameter is the angle theta_mag between ISM flow and magnetisation, taken to 0, 45 and 90 degrees. It is found that simulation dimension, coordinate systems and grid effects can greatly affect the development of the modelled astrospheres. Nevertheless, as soon as the ISM flow and magnetisation directions differs by more than a few degrees (theta_mag>5 degree), the bow shock is stabilised, most clumpiness and ragged structures vanishing. The complex shape of the bowshocks induce important projection effects, e.g. at optical Ha line, producing complex of astrospheric morphologies. We speculate that those effects are also at work around earlier-type massive stars, which would explain their diversity of their observed arc-like nebula around runaway OB stars. Our 3D MHD models are fitting well observations of the astrospheres of several runaway red supergiant stars. The results interpret the smoothed astrosphere of IRC-10414 and Betelgeuse aOri) are stabilised by an organised, non-parallel ambient magnetic field. Our findings suggest that IRC-10414 is currently in a steady state of its evolution, and that Betelgeuse's bar is of interstellar origin.
description: Accepted to MNRAS
Realizability and exceptionality of candidate surface branched covers: methods and results
Creators: name: Pervova, Ekaterina
name: Petronio, Carlo
Publisher: name: arXiv
Year: 2007
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M12, 57M50

description: Given two closed orientable surfaces, the Hurwitz existence problem asks whether there exists a branched cover between them having prescribed global degree and local degrees over the branching points. The Riemann-Hurwitz formula gives a necessary condition, which was shown to be also sufficient when the base surface has positive genus. For the sphere one knows that for some data the cover exists and for some it does not, but the problem is still open in general. In this paper we will review five different techniques recently employed to attack it, and we will state the main results they have led to. To illustrate the techniques we will give five independent proofs of the fact that there is no branched cover of the sphere over itself with degree 4, three branching points, and local degrees (2,2), (2,2), and (3,1) over them (despite the fact that the Riemann-Hurwitz formula is satisfied).
description: 19 pages, 5 figures. A few misprints in the first version have been corrected in the second one
High-Temperature Decomposition of Diisopropyl Methylphosphonate (DIMP) on Alumina: Mechanistic Predictions from Ab Initio Molecular Dynamics
Creators: name: Biswas, Sohag
name: Wong, Bryan M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: FOS: Physical sciences

description: The enhanced degradation of organophosphorous-based chemical warfare agents (CWAs) on metal-oxide surfaces holds immense promise for neutralization efforts; however, the underlying mechanisms in this process remain poorly understood. We utilize large-scale quantum calculations for the first time to probe the high-temperature degradation of diisopropyl methylphosphonate (DIMP), a nerve agent simulant. Our Born-Oppenheimer molecular dynamics (BOMD) calculations show that the $γ$-Al$_2$O$_3$ surface shows immense promise for quickly adsorbing and destroying CWAs. We find that the alumina surface quickly adsorbs DIMP at all temperatures, and subsequent decomposition of DIMP proceeds via a propene elimination. Our BOMD calculations are complemented with metadynamics simulations to produce free energy paths, which show that the activation barrier decreases with temperature and DIMP readily decomposes on $γ$-Al$_2$O$_3$. Our first-principle BOMD and metadynamics simulations provide crucial diagnostics for sarin decomposition models and mechanistic information for examining CWA decomposition reactions on other candidate metal oxide surfaces.
description: Accepted by the Journal of Physical Chemistry C
Loop-Free Tensor Networks for High-Energy Physics
Creators: name: Montangero, S.
name: Rico, E.
name: Silvi, P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: This brief review introduces the reader to tensor network methods, a powerful theoretical and numerical paradigm spawning from condensed matter physics and quantum information science and increasingly exploited in different fields of research, from artificial intelligence to quantum chemistry. Here, we specialise our presentation on the application of loop-free tensor network methods to the study of High-Energy Physics (HEP) problems and, in particular, to the study of lattice gauge theories where tensor networks can be applied in regimes where Monte Carlo methods are hindered by the sign problem.
description: 20 pages, 2 figures, invited manuscript for Philosophical Transactions A
MEDIAL AND BILATERAL LESIONS ARE NECESSARY FOR DEVELOPMENT OF POSTERIOR FOSSA SYNDROME IN CHILDREN
Creators: name: Shook, Devon
Publisher: name: ProQuest
Year: 2023
Subjects: classificationCode: 52
subject: Psychology
subject: FOS: Psychology
classificationCode: 5202
subject: Biological psychology

description: Posterior fossa syndrome (PFS) is a well-characterized clinical syndrome arising from surgical resection of posterior fossa tumors in children that involves mutism, emotional instability and motor impairment. It is estimated that over 30% of patients develop this disorder following posterior fossa surgery, but its etiology is unknown. Of particular interest to the pathophysiology of PFS is the location of cerebellar lesions that are associated with the subsequent development of PFS. In this study, we performed an analysis of postoperative high-resolution structural magnetic resonance imaging scans of 13 pediatric patients with cerebellar tumors. The extent and location of tumor resection was traced for each subject and normalized into standard space. Surgical complications were noted and patients completed measures of behavior and affect. Patients developing PFS (N=4) and one with motor difficulties all showed a pattern of tumor resection bilaterally in the medial cerebellum, including damage to cerebellar lobules VI, IX and X. Patients who did not develop PFS did not have medial cerebellar damage, with most of the resection limited to cerebellar lobules VIIb and Crus II. These findings suggest that medial, bilateral damage is necessary for the development of PFS.
Late time acceleration in 3-brane Brans-Dicke cosmology
Creators: name: Errahmani, A.
name: Ouali, T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In order to investigate more features of the Brans-Dicke cosmology in the five-dimensional space-time, we explore the solutions of its dynamiacal systems. A behavior of the universe in its early and late time by means of the scale factor is considered. As a results, we show that it is possible to avoid the big rip singularity and to cross the phantom divide line. Furthermore, we review the dark energy component of the universe and its agreement with the observation data for this 3-brane Brans Dicke cosmology by means of the cosmological parameters.
Search for flavor-changing neutral current interactions of the top quark and Higgs boson in final states with two photons in proton-proton collisions at $\sqrt{s}$ =13 TeV
Creators: name: CMS Collaboration
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2021
Subjects: neutral current, flavor changing
p p, scattering
two-photon
Higgs particle
TeV
branching ratio
quark
CERN LHC Coll
charm
background
signature
mass spectrum
CMS

description: Proton-proton interactions resulting in final states with two photons are studied in a search for the signature of flavor-changing neutral current interactions of top quarks (t) and Higgs bosons (H). The analysis is based on data collected at a center-of-mass energy of 13 TeV with the CMS detector at the LHC, corresponding to an integrated luminosity of 137 fb$^{-1}$. No significant excess above the background prediction is observed. Upper limits on the branching fractions ($\mathcal{B}$) of the top quark decaying to a Higgs boson and an up (u) or charm quark (c) are derived through a binned fit to the diphoton invariant mass spectrum. The observed (expected) 95% confidence level upper limits are found to be 0.019 (0.031)% for $\mathcal B$(t $\to$ Hu) and 0.073 (0.051)% for $\mathcal{B}$(t $\to$ Hc). These are the strictest upper limits yet determined.
Efficient generation of >2 W of green light by single pass frequency doubling in PPMgLN
Creators: name: Pullen, M. G.
name: Chapman, J. J.
name: Kielpinski, D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We report 32% efficient frequency doubling of single frequency 1029 nm light to green light at 514.5 nm using a single pass configuration. A congruent composition, periodically poled magnesium doped lithium niobate (PPMgLN) crystal of 50 mm length was used to generate a second harmonic power of 2.3 W. To our knowledge, this is the highest reported frequency doubling efficiency of any wavelength light in a PPMgLN crystal and also the highest reported SHG output power in the green for PPMgLN.
description: 5 pages, 3 figures. Submitted to Optics Express, awaiting response
Search for low-mass dilepton resonances in Higgs boson decays to four-lepton final states in proton-proton collisions at $\sqrt{s}$ =13 TeV
Creators: name: CMS Collaboration
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2021
Subjects: Higgs particle, decay
p p, scattering
dilepton, resonance
TeV
branching ratio
axion-like particles
CERN Lab
photon
CERN LHC Coll
CMS

description: A search for low-mass dilepton resonances in Higgs boson decays is conducted in the four-lepton final state. The decay is assumed to proceed via a pair of beyond the standard model particles, or one such particle and a Z boson. The search uses proton-proton collision data collected with the CMS detector at the CERN LHC, corresponding to an integrated luminosity of 137 fb$^{-1}$, at a center-of-mass energy $\sqrt{s}$ = 13 TeV. No significant deviation from the standard model expectation is observed. Upper limits at 95% confidence level are set on model-independent Higgs boson decay branching fractions. Additionally, limits on dark photon and axion-like particle production, based on two specific models, are reported.
Fluctuations of the partition function in the GREM with external field
Creators: name: Bovier, Anton
name: Klimovsky, Anton
Publisher: name: arXiv
Year: 2008
Subjects: subject: Probability (math.PR)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 60K35, 82B44

description: We study Derrida's generalized random energy model in the presence of uniform external field. We compute the fluctuations of the ground state and of the partition function in the thermodynamic limit for all admissible values of parameters. We find that the fluctuations are described by a hierarchical structure which is obtained by a certain coarse-graining of the initial hierarchical structure of the GREM with external field. We provide an explicit formula for the free energy of the model. We also derive some large deviation results providing an expression for the free energy in a class of models with Gaussian Hamiltonians and external field. Finally, we prove that the coarse-grained parts of the system emerging in the thermodynamic limit tend to have a certain optimal magnetization, as prescribed by strength of external field and by parameters of the GREM.
description: 24 pages
A short proof of the Twelve points theorem
Creators: name: Cencelj, Matija
name: Repovš, Dušan
name: Skopenkov, Mikhail
Publisher: name: arXiv
Year: 2008
Subjects: subject: Metric Geometry (math.MG)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 52B20

description: We present a short elementary proof of the following Twelve Points Theorem: Let M be a convex polygon with vertices at the lattice points, containing a single lattice point in its interior. Denote by m (resp. m*) the number of lattice points in the boundary of M (resp. in the boundary of the dual polygon). Then m+m*=12.
description: in English and in Russian, 4 pages, 4 figures
Mary Warburg, geb. Hertz Ein kurzes Porträt der vergessenen Künstlerin
Creators: name: Hedinger, Bärbel; Diers, Michael
Publisher: name: La Rivista di Engramma
Year: 2020
Subjects: Mary Hertz
Aby Warburg
biography

description: In this issue of Engramma, we publish an excerpt from the volume Mary Warburg: Porträt einer Künstlerin. Leben|Werk edited by Bärbel Hedinger and Michael Diers, Hirmer Verlag (Munich 2020). The volume contains essays by Jutta Braden, Steffen Haug, John Prag, Andrea Völker and Martin Warnke, as well as a catalog raisonné, with around 900 illustrations. This is the first monograph dedicated to the artist Mary Hertz (1866-1934), Aby Warburg’s wife; a collective work including a catalogue that anticipates several exhibitions scheduled for 2021 in Cologne and Hamburg and later also in London
Harmonic G-structures
Creators: name: Davila, J. C. Gonzalez
name: Cabrera, F. Martin
Publisher: name: arXiv
Year: 2007
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C10; 53C15; 53C25

description: For closed and connected subgroups G of SO(n), we study the energy functional on the space of G-structures of a (compact) Riemannian manifold M, where G-structures are considered as sections of the quotient bundle O(M)/G. Then, we deduce the corresponding first and second variation formulae and the characterising conditions for critical points by means of tools closely related with the study of G-structures. In this direction, we show the role in the energy functional played by the intrinsic torsion of the G-structure. Moreover, we analyse the particular case G=U(n) for even-dimensional manifolds. This leads to the study of harmonic almost Hermitian manifolds and harmonic maps from M into O(M)/U(n).
description: 27 pages, minor corrections