cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Peccei-Quinn symmetry for Dirac seesaw and leptogenesis
Creators: name: Gu, Pei-Hong
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We extend the DFSZ invisible axion model to simultaneously explain small Dirac neutrino masses and cosmic matter-antimatter asymmetry. After the Peccei-Quinn and electroweak symmetry breaking, the effective Yukawa couplings of the Dirac neutrinos to the standard model Higgs scalar can be highly suppressed by the ratio of the vacuum expectation value of an iso-triplet Higgs scalar over the masses of some heavy gauge-singlet fermions, iso-doublet Higgs scalars or iso-triplet fermions. The iso-triplet fields can carry a zero or nonzero hypercharge. Through the decays of the heavy gauge-singlet fermions, iso-doublet scalars or iso-triplet fermions, we can obtain a lepton asymmetry in the left-handed leptons and an opposite lepton asymmetry in the right-handed neutrinos. Since the right-handed neutrinos do not participate in the sphaleron processes, the left-handed lepton asymmetry can be partially converted to a baryon asymmetry.
description: 12 pages, 8 figures, numerical estimations and more references are added to match the journal version
High Baryon Densities in Heavy Ion Collisions at Energies Attainable at the BNL Relativistic Heavy Ion Collider and the CERN Large Hadron Collider
Creators: name: Li, Ming
name: Kapusta, Joseph I.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In very high energy collisions nuclei are practically transparent to each other but produce very hot, nearly baryon-free, matter in the so-called central rapidity region. The energy in the central rapidity region comes from the kinetic energy of the colliding nuclei. We calculate the energy and rapidity loss of the nuclei using the color glass condensate model. This model also predicts the excitation energy of the nuclear fragments. Using a space-time picture of the collision we calculate the baryon and energy densities of the receding baryonic fireballs. For central collisions of gold nuclei at the highest energy attainable at the Relativistic Heavy Ion Collider, for example, we find baryon densities more than ten times that of atomic nuclei over a large volume.
description: 5 pages, 7 figures. This version incorporates changes in response to the referee reports
Turing Instability in an Economic-Demographic Dynamical System Can Lead to Pattern Formation on Geographical Scale
Creators: name: Zincenko, Anna
name: Petrovskii, Sergei
name: Volpert, Vitaly
Publisher: name: arXiv
Year: 2020
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences
subject: 35B36 (Primary) 91D20, 91C99 (Secondary)

description: Spatial distribution of the human population is distinctly heterogeneous, e.g. showing significant difference in the population density between urban and rural areas. In the historical perspective, i.e. on the timescale of centuries, the emergence of the densely populated areas at their present locations is widely believed to be linked to more favourable environmental and climatic conditions. In this paper, we challenge this point of view. We first identify a few areas at different parts of the world where the environmental conditions (quantified by the temperature, precipitation and elevation) are approximately uniform over thousands of miles. We then examine the population distribution across those areas to show that, in spite of the homogeneity of the environment, it exhibits a clear nearly-periodic spatial pattern. Based on this apparent disagreement, we hypothesize that there exists an inherent mechanism that can lead to pattern formation even in a uniform environment. We consider a mathematical model of the coupled demographic-economic dynamics and show that its spatially uniform, locally stable steady state can give rise to a periodic spatial pattern due to the Turing instability. Using computer simulations, we show that, interestingly, the emergence of the Turing patterns eventually leads to the system collapse.
description: 26 pages, 14 figures
Shape derivatives for the penalty formulation of contact problems with Tresca friction
Creators: name: Chaudet-Dumas, Bastien
name: Deteix, Jean
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optimization and Control (math.OC)
subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: In this article, the shape optimization of a linear elastic body subject to frictional (Tresca) contact is investigated. Due to the projection operators involved in the formulation of the contact problem, the solution is not shape differentiable in general. Moreover, shape optimization of the contact zone requires the computation of the gap between the bodies in contact, as well as its shape derivative. Working with directional derivatives, sufficient conditions for shape differentiability are derived. %The problem is addressed in the general framework of two bodies with smooth boundaries. Then, some numerical results, obtained with a gradient descent algorithm based on those shape derivatives, are presented.
description: Preprint
Double ramification cycles and the $n$-point function for the moduli space of curves
Creators: name: Buryak, Alexandr
Publisher: name: arXiv
Year: 2016
Subjects: subject: Algebraic Geometry (math.AG)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: In this paper, using the formula for the integrals of the $ψ$-classes over the double ramification cycles found by S. Shadrin, L. Spitz, D. Zvonkine and the author, we derive a new explicit formula for the $n$-point function of the intersection numbers on the moduli space of curves.
description: Revised version, 10 pages, to be published in the Moscow Mathematical Journal
Leptogenesis, radiative neutrino masses and inert Higgs triplet dark matter
Creators: name: Lu, Wen-Bin
name: Gu, Pei-Hong
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We extend the standard model by three types of inert fields including Majorana fermion singlets/triplets, real Higgs singlets/triplets and leptonic Higgs doublets. In the presence of a softly broken lepton number and an exactly conserved Z_2 discrete symmetry, these inert fields together can mediate a one-loop diagram for a Majorana neutrino mass generation. The heavier inert fields can decay to realize a successful leptogenesis while the lightest inert field can provide a stable dark matter candidate. As an example, we demonstrate the leptogenesis by the inert Higgs doublet decays. We also perform a systematic study on the inert Higgs triplet dark matter scenario where the interference between the gauge and Higgs portal interactions can significantly affect the dark matter properties.
description: 12 pages, 7 figures, references added
Primality of closed path polyominoes
Creators: name: Cisto, Carmelo
name: Navarra, Francesco
Publisher: name: arXiv
Year: 2020
Subjects: subject: Combinatorics (math.CO)
subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: 05B50, 05E40, 13C05, 13G05

description: In this paper we introduce a new class of polyominoes, called closed paths, and we study the primality of their associated ideal. Inspired by an existing conjecture that characterizes the primality of a polyomino ideal by nonexistence of zig-zag walks, we classify all closed paths which do not contain zig-zag walks, and we give opportune toric representations of the associated ideals. To support the conjecture we prove that having no zig-zag walks is a necessary and sufficient condition for the primality of the associated ideal of a closed path. Finally, we present some classes of prime polyominoes viewed as generalizations of closed paths.
description: To appear in Journal of Algebra and its Applications
Cellularization for exceptional spherical space forms and the flag manifold of $SL_3(\mathbb{R})$
Creators: name: Chirivi, Rocco
name: Garnier, Arthur
name: Spreafico, Mauro
Publisher: name: arXiv
Year: 2020
Subjects: subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics

description: We construct an explicit equivariant cellular decomposition of the $(4n-1)$-sphere with respect to binary polyhedral groups, and describe the associated cellular homology chain complex. As a corollary of the binary octahedral case, we deduce an $\mathfrak{S}_3$-equivariant decomposition of the flag manifold of $SL_3(\mathbb{R})$.
description: submitted to Transformation Groups
Anisotropic long-range interaction investigated with cold atoms
Creators: name: Mancois, Vincent
name: Barré, Julien
name: Kwong, Chang Chi
name: Olivetti, Alain
name: Viot, Pascal
name: Wilkowski, David
Publisher: name: arXiv
Year: 2020
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In two dimensions, a system of self-gravitating particles collapses and forms a singularity in finite time below a critical temperature $T_c$. We investigate experimentally a quasi two-dimensional cloud of cold neutral atoms in interaction with two pairs of perpendicular counter-propagating quasi-resonant laser beams, in order to look for a signature of this ideal phase transition: indeed, the radiation pressure forces exerted by the laser beams can be viewed as an anisotropic, and non-potential, generalization of two-dimensional self-gravity. We first show that our experiment operates in a parameter range which should be suitable to observe the collapse transition. However, the experiment unveils only a moderate compression instead of a phase transition between the two phases. A three-dimensional numerical simulation shows that both the finite small thickness of the cloud, which induces a competition between the effective gravity force and the repulsive force due to multiple scattering, and the atomic losses due to heating in the third dimension, contribute to smearing the transition.
description: 11 pages, 8 figures, accepted in Physical Review A
Superconducting quantum criticality of topological surface states at three loops
Creators: name: Zerf, Nikolai
name: Lin, Chien-Hung
name: Maciejko, Joseph
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The semimetal-superconductor quantum phase transition on the two-dimensional (2D) surface of a 3D topological insulator is conjectured to exhibit an emergent $\mathcal{N}=2$ supersymmetry, based on a renormalization group (RG) analysis at one-loop order in the $ε$ expansion. We provide additional support for this conjecture by performing a three-loop RG analysis and showing that the supersymmetric fixed point found at this order survives the extrapolation to 2D. We compute critical exponents to order $ε^3$, obtaining the more accurate value $ν\approx 0.985$ for the correlation length exponent and confirming that the fermion and boson anomalous dimensions remain unchanged beyond one loop, as expected from non-renormalization theorems in supersymmetric theories. We further couple the system to a dynamical $U(1)$ gauge field, and argue that the transition becomes fluctuation-induced first order. We discuss implications of this result for quantum phase transitions between certain symmetry-preserving correlated surface states of 3D topological insulators.
description: 19 pages, 11 figures; v2: published version [Editors' Suggestion]
Chemistry and Kinematics of Red Supergiant Stars in the Young Massive Cluster NGC 2100
Creators: name: Patrick, L. R.
name: Evans, C. J.
name: Davies, B.
name: Kudritzki, R-P.
name: Hénault-Brunet, V.
name: Bastian, N.
name: Lapenna, E.
name: Bergemann, M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We have obtained K-band Multi-Object Spectrograph (KMOS) near-IR spectroscopy for 14 red supergiant stars (RSGs) in the young massive star cluster NGC 2100 in the Large Magellanic Cloud (LMC). Stellar parameters including metallicity are estimated using the J-band analysis technique, which has been rigorously tested in the Local Universe. We find an average metallicity for NGC 2100 of [Z]=$-$0.43$\pm$0.10 dex, in good agreement with estimates from the literature for the LMC. Comparing our results in NGC 2100 with those for a Galactic cluster (at Solar-like metallicity) with a similar mass and age we find no significant difference in the location of RSGs in the Hertzsprung--Russell diagram. We combine the observed KMOS spectra to form a simulated integrated-light cluster spectrum and show that, by analysing this spectrum as a single RSG, the results are consistent with the average properties of the cluster. Radial velocities are estimated for the targets and the dynamical properties are estimated for the first time within this cluster. The data are consistent with a flat velocity dispersion profile, and with an upper limit of 3.9 km/s, at the 95% confidence level, for the velocity dispersion of the cluster. However, the intrinsic velocity dispersion is unresolved and could, therefore, be significantly smaller than the upper limit reported here. An upper limit on the dynamical mass of the cluster is derived as $M_{dyn}$ $\le$ $15.2\times10^{4}M_{\odot}$ assuming virial equilibrium.
description: Accepted in MNRAS
Testing DARKexp against energy and density distributions of Millennium-II halos
Creators: name: Nolting, Chris
name: Williams, Liliya L. R.
name: Boylan-Kolchin, Michael
name: Hjorth, Jens
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We test the DARKexp model for relaxed, self-gravitating, collisionless systems against equilibrium dark matter halos from the Millennium-II simulation. While limited tests of DARKexp against simulations and observations have been carried out elsewhere, this is the first time the testing is done with a large sample of simulated halos spanning a factor of ~ 50 in mass, and using independent fits to density and energy distributions. We show that DARKexp, a one shape parameter family, provides very good fits to the shapes of density profiles, ρ(r), and differential energy distributions, N(E), of individual simulated halos. The best fit shape parameter $ϕ_{0}$ obtained from the two types of fits are correlated, though with scatter. Our most important conclusions come from ρ(r) and N(E) that have been averaged over many halos. These show that the bulk of the deviations between DARKexp and individual Millennium-II halos come from halo-to-halo fluctuations, likely driven by substructure, and other density perturbations. The average ρ(r) and N(E) are quite smooth and follow DARKexp very closely. The only deviation that remains after averaging is small, and located at most bound energies for N(E) and smallest radii for ρ(r). Since the deviation is confined to 3-4 smoothing lengths, and is larger for low mass halos, it is likely due to numerical resolution effects.
description: 24 pages, 12 figures, Accepted for publication in the Journal of Cosmology and Astroparticle Physics (JCAP)
SHE'RIYATDA TINCHLIK MAVZUSI
Creators: name: Ibragimova Madina Normat qizi Urganch davlat universiteti filologiya va san'at fakulteti 2-kurs
Publisher: name: Zenodo
Year: 2025

description: Tinchlik -hamisha oliy ne’mat, uni asrash va avaylash har kimning qo’lida. Insonlarni osoyishtalikka chorlashda shoir va ijodkorlar  doim peshqadam bo’lishgan. Havola etilayotgan ushbu maqolada yuqoridagi mavzu ko’lamini shoirlarimiz Zulfiya Isroilova va Mirtemir ijodida ko’rib chiqamiz.

Kalit so’zlar: tinchlik, she’riyat, urush, zamon
Introduction to the Faculty Resource Guide: Integrating Social Justice, Diversity, Equity and Inclusion Issues in STEMM courses
Creators: name: Marsteller, Pat
name: Reilly, Eliza
Publisher: name: QUBES Educational Resources
Year: 2024

description: We live in challenging times. Higher education faces many challenges including changes in enrollment pattern, fiscal constraints and lack of public acceptance of the value of the degree relative to its costs. Our students are more diverse in countless intersectional ways: culture, neurodiversity, background, experience as well as gender, ethnicity etc. They have different hopes and aspirations. To reach all we must engage, know who they are, understand potential biases, and create welcoming environments, both brave and safe spaces, where students can address the challenges that confront the world. In response to call for STEM education reform in the 90’s, thousands of science educators have worked tirelessly to change academic culture and play their part in delivering on the social contract between science and a truly inclusive democratic society. The goal of this Faculty Research Guide is to expand the community committed to a more humane, socially responsible educational practice that will make a better future for us all and point the way to “strategic, collective action.”
Qubit and Fermionic Fock Spaces from Type II Superstring Black Holes
Creators: name: Belhaj, A.
name: Bensed, M.
name: Benslimane, Z.
name: Sedra, M. B.
name: Segui, A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Using Hodge diagram combinatorial data, we study qubit and fermionic Fock spaces from the point of view of type II superstring black holes based on complex compactifications. Concretely, we establish a one-to-one correspondence between qubits, fermionic spaces and extremal black holes in maximally supersymmetric supergravity obtained from type II superstring on complex toroidal and Calabi-Yau compactifications. We interpret the differential forms of the n-dimensional complex toroidal compactification as states of n-qubits encoding information on extremal black hole charges. We show that there are 2^n copies of n-qubit systems which can be split as 2^n=2^{n-1}+2^{n-1}. More precisely, 2^{n-1} copies are associated with even D-brane charges in type IIA superstring and the other 2^{n-1} ones correspond to odd D-brane charges in IIB superstring. This correspondence is generalized to a class of Calabi-Yau manifolds. In connection with black hole charges in type IIA superstring, an n-qubit system has been obtained from a canonical line bundle of n factors of one dimensional projective space \mathbb{CP}^1.
description: 21 pages, 2 figures, latex. Accepted for publication in International Journal of Geometric Methods in Modern Physics (2017)
Dynamics of passive and active membrane tubes
Creators: name: Al-Izzi, Sami C.
name: Sens, Pierre
name: Turner, Matthew S.
name: Komura, Shigeyuki
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: Utilising Onsager's variational formulation, we derive dynamical equations for the relaxation of a fluid membrane tube in the limit of small deformation, allowing for a contrast of solvent viscosity across the membrane and variations in surface tension due to membrane incompressibility. We compute the relaxation rates, recovering known results in the case of purely axis-symmetric perturbations and making new predictions for higher order (azimuthal) $m$-modes. We analyse the long and short wavelength limits of these modes by making use of various asymptotic arguments. We incorporate stochastic terms to our dynamical equations suitable to describe both passive thermal forces and non-equilibrium active forces. We derive expressions for the fluctuation amplitudes, an effective temperature associated with active fluctuations, and the power spectral density for both the thermal and active fluctuations. We discuss an experimental assay that might enable measurement of these fluctuations to infer the properties of the active noise. Finally we discuss our results in the context of active membranes more generally and give an overview of some open questions in the field.
description: 14 pages, 9 figures
MTP: Multi-Task Pruning for Efficient Semantic Segmentation Networks
Creators: name: Chen, Xinghao
name: Zhang, Yiman
name: Wang, Yunhe
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: Image and Video Processing (eess.IV)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper focuses on channel pruning for semantic segmentation networks. Previous methods to compress and accelerate deep neural networks in the classification task cannot be straightforwardly applied to the semantic segmentation network that involves an implicit multi-task learning problem via pre-training. To identify the redundancy in segmentation networks, we present a multi-task channel pruning approach. The importance of each convolution filter \wrt the channel of an arbitrary layer will be simultaneously determined by the classification and segmentation tasks. In addition, we develop an alternative scheme for optimizing importance scores of filters in the entire network. Experimental results on several benchmarks illustrate the superiority of the proposed algorithm over the state-of-the-art pruning methods. Notably, we can obtain an about $2\times$ FLOPs reduction on DeepLabv3 with only an about $1\%$ mIoU drop on the PASCAL VOC 2012 dataset and an about $1.3\%$ mIoU drop on Cityscapes dataset, respectively.
The influence of circumnuclear environment on the radio emission from TDE jets
Creators: name: Generozov, A.
name: Mimica, P.
name: Metzger, B. D.
name: Stone, N. C.
name: Giannios, D.
name: Aloy, M. A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Dozens of stellar tidal disruption events (TDEs) have been identified at optical, UV and X-ray wavelengths. A small fraction of these, most notably Swift J1644+57, produce radio synchrotron emission, consistent with a powerful, relativistic jet shocking the surrounding circumnuclear gas. The dearth of similar non-thermal radio emission in the majority of TDEs may imply that powerful jet formation is intrinsically rare, or that the conditions in galactic nuclei are typically unfavorable for producing a detectable signal. Here we explore the latter possibility by constraining the radial profile of the gas density encountered by a TDE jet using a one-dimensional model for the circumnuclear medium which includes mass and energy input from a stellar population. Near the jet Sedov radius of 10$^{18}$ cm, we find gas densities in the range of $n_{18} \sim$ 0.1$-$1000 cm$^{-3}$ across a wide range of plausible star formation histories. Using one- and two-dimensional relativistic hydrodynamical simulations, we calculate the synchrotron radio light curves of TDE jets (as viewed both on and off-axis) across the allowed range of density profiles. We find that bright radio emission would be produced across the plausible range of nuclear gas densities by jets as powerful as Swift J1644+57, and we quantify the relationship between the radio luminosity and jet energy. We use existing radio detections and upper limits to constrain the energy distribution of TDE jets. Radio follow up observations several months to several years after the TDE candidate will strongly constrain the energetics of any relativistic flow.
description: 16 pages, 13 figures, 2 tables. Accepted for publication in MNRAS
Statistical modeling of the fluid dual to Boulware-Deser Black hole
Creators: name: López, J. L.
name: Bhattacharya, Swastik
name: Shankaranarayanan, S.
Publisher: name: arXiv
Year: 2015
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this work we study the statistical and thermodynamic properties of the horizon fluid corresponding to the Boulware-Deser (BD) black hole of Einstein-Gauss-Bonnet (EGB) gravity. Using mean field theory, we show explicitly that the BD fluid exhibits the coexistence of two phases, a BEC and a non-condensed phase corresponding to the Einstein term and the Gauss-Bonnet term in the gravity action, respectively. In the fluid description, the high-energy corrections associated to Gauss-Bonnet gravity are modeled as excitations of the fluid medium. We provide statistical modeling of the excited part of the fluid and explicitly show that it is characterized by a generalized dispersion relation which in $D=6$ dimensions corresponds to a non-relativistic fluid. We also shed light on the ambiguity found in the literature regarding the expression of the entropy of the horizon fluid. We provide a general prescription to obtain the entropy and show that it is indeed given by Wald entropy.
Representative elementary volume via averaged scalar Minkowski functionals
Creators: name: Andreeva, M. V.
name: Kalyuzhnyuk, A. V.
name: Krutko, V. V.
name: Russkikh, N. E.
name: Taimanov, I. A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Representative Elementary Volume (REV) at which the material properties do not vary with change in volume is an important quantity for making measurements or simulations which represent the whole. We discuss the geometrical method to evaluation of REV based on the quantities coming in the Steiner formula from convex geometry. For bodies in the three-space this formula gives us four scalar functionals known as scalar Minkowski functionals. We demonstrate on certain samples that the values of such averaged functionals almost stabilize for cells for which the length of edges are greater than certain threshold value R. Therefore, from this point of view, it is reasonable to consider cubes of volume R^3 as representative elementary volumes.
description: 7 pages
Fluctuations as a test of chemical non-equilibrium at the LHC
Creators: name: Begun, Viktor
Publisher: name: arXiv
Year: 2016
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: It is shown that large chemical potential leads to the significant increase of multiplicity fluctuations for bosons, and makes the fluctuations infinite in the case of Bose-Einstein condensation. It allows to distinguish between the models that explain the anomalous proton to pion ratio and the low transverse momentum enhancement of pion spectra in Pb+Pb collisions at the LHC within chemical equilibrium or non-equilibrium models. The effects of resonance decays, finite size of the system, requirements to the event statistics, different momentum cuts, and limited detector acceptance are considered. The obtained results show the possibility to observe a substantial increase of the normalized kurtosis for positively or negatively charged pions in the case of non-equilibrium or partial pion condensation using currently measured data.
description: The errors due to uncertainty in T and \mu determination are discussed. The most peripheral centrality $c=80-90\%$ is added to all figures and discussed in the text
$L^1$-convergence to generalized Barenblatt solution for compressible Euler equations with time-dependent damping
Creators: name: Shifeng, Geng
name: Feimin, Huang
name: Xiaochun, Wu
Publisher: name: arXiv
Year: 2020
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: The large time behavior of entropy solution to the compressible Euler equations for polytropic gas (the pressure $p(ρ)=κρ^γ, γ>1$) with time dependent damping like $-\frac{1}{(1+t)^λ}ρu$ ($0<λ<1$) is investigated. By introducing an elaborate iterative method and using the intensive entropy analysis, it is proved that the $L^\infty$ entropy solution of compressible Euler equations with finite initial mass converges strongly in the natural $L^1$ topology to a fundamental solution of porous media equation (PME) with time-dependent diffusion, called by generalized Barenblatt solution. It is interesting that the $L^1$ decay rate is getting faster and faster as $λ$ increases in $(0, \fracγ{γ+2}]$, while is getting slower and slower in $[ \fracγ{γ+2}, 1)$.
Dynamics of skyrmionic states in confined helimagnetic nanostructures
Creators: name: Beg, Marijan
name: Albert, Maximilian
name: Bisotti, Marc-Antonio
name: Cortés-Ortuño, David
name: Wang, Weiwei
name: Carey, Rebecca
name: Vousden, Mark
name: Hovorka, Ondrej
name: Ciccarelli, Chiara
name: Spencer, Charles S.
name: Marrows, Christopher H.
name: Fangohr, Hans
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In confined helimagnetic nanostructures, skyrmionic states in the form of incomplete and isolated skyrmion states can emerge as the ground state in absence of both external magnetic field and magnetocrystalline anisotropy. In this work, we study the dynamic properties (resonance frequencies and corresponding eigenmodes) of skyrmionic states in thin film FeGe disk samples. We employ two different methods in finite-element based micromagnetic simulation: eigenvalue and ringdown method. The eigenvalue method allows us to identify all resonance frequencies and corresponding eigenmodes that can exist in the simulated system. However, using a particular experimentally feasible excitation can excite only a limited set of eigenmodes. Because of that, we perform ringdown simulations that resemble the experimental setup using both in-plane and out-of-plane excitations. In addition, we report the nonlinear dependence of resonance frequencies on the external magnetic bias field and disk sample diameter and discuss the possible reversal mode of skyrmionic states. We compare the power spectral densities of incomplete skyrmion and isolated skyrmion states and observe several key differences that can contribute to the experimental identification of the state present in the sample. We measure the FeGe Gilbert damping, and using its value we determine what eigenmodes can be expected to be observed in experiments. Finally, we show that neglecting the demagnetisation energy contribution or ignoring the magnetisation variation in the out-of-film direction - although not changing the eigenmode's magnetisation dynamics significantly - changes their resonance frequencies substantially. Apart from contributing to the understanding of skyrmionic states physics, this systematic work can be used as a guide for the experimental identification of skyrmionic states in confined helimagnetic nanostructures.
description: manuscript: 17 pages, 9 figures; supplementary information: 10 pages, 8 figures
Coloring Drawings of Graphs
Creators: name: Hertrich, Christoph
name: Schröder, Felix
name: Steiner, Raphael
Publisher: name: arXiv
Year: 2020
Subjects: subject: Combinatorics (math.CO)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: F.2.2; G.2.2
subject: 05C10 05C15 (Primary) 05C45 (Secondary)

description: We consider cell colorings of drawings of graphs in the plane. Given a multi-graph $G$ together with a drawing $Γ(G)$ in the plane with only finitely many crossings, we define a cell $k$-coloring of $Γ(G)$ to be a coloring of the maximal connected regions of the drawing, the cells, with $k$ colors such that adjacent cells have different colors. By the $4$-color theorem, every drawing of a bridgeless graph has a cell $4$-coloring. A drawing of a graph is cell $2$-colorable if and only if the underlying graph is Eulerian. We show that every graph without degree 1 vertices admits a cell $3$-colorable drawing. This leads to the natural question which abstract graphs have the property that each of their drawings has a cell $3$-coloring. We say that such a graph is universally cell $3$-colorable. We show that every $4$-edge-connected graph and every graph admitting a nowhere-zero $3$-flow is universally cell $3$-colorable. We also discuss circumstances under which universal cell $3$-colorability guarantees the existence of a nowhere-zero $3$-flow. On the negative side, we present an infinite family of universally cell $3$-colorable graphs without a nowhere-zero $3$-flow. On the positive side, we formulate a conjecture which has a surprising relation to a famous open problem by Tutte known as the $3$-flow-conjecture. We prove our conjecture for subcubic and for $K_{3,3}$-minor-free graphs.
description: 35 pages, 23 figures
Efficient simulations of tubulin-driven axonal growth
Creators: name: Diehl, Stefan
name: Henningsson, Erik
name: Heyden, Anders
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cell Behavior (q-bio.CB)
subject: FOS: Biological sciences

description: This work concerns efficient and reliable numerical simulations of the dynamic behaviour of a moving-boundary model for tubulin-driven axonal growth. The model is nonlinear and consists of a coupled set of a partial differential equation (PDE) and two ordinary differential equations. The PDE is defined on a computational domain with a moving boundary, which is part of the solution. Numerical simulations based on standard explicit time-stepping methods are too time consuming due to the small time steps required for numerical stability. On the other hand standard implicit schemes are too complex due to the nonlinear equations that needs to be solved in each step. Instead, we propose to use the Peaceman--Rachford splitting scheme combined with temporal and spatial scalings of the model. Simulations based on this scheme have shown to be efficient, accurate, and reliable which makes it possible to evaluate the model, e.g.\ its dependency on biological and physical model parameters. These evaluations show among other things that the initial axon growth is very fast, that the active transport is the dominant reason over diffusion for the growth velocity, and that the polymerization rate in the growth cone does not affect the final axon length.
description: Authors' accepted version, (post refereeing). The final publication (in Journal of Computational Neuroscience) is available at Springer via http://dx.doi.org/10.1007/s10827-016-0604-x
Persistence of preys in a diffusive three species predator-prey system with a pair of strong-weak competing preys
Creators: name: Chen, Yu-Shuo
name: Giletti, Thomas
name: Guo, Jong-Shenq
Publisher: name: arXiv
Year: 2020
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We investigate the traveling wave solutions of a three-species system involving a single predator and a pair of strong-weak competing preys. Our results show how the predation may affect this dynamics. More precisely, we describe several situations where the environment is initially inhabited by the predator and by either one of the two preys. When the weak competing prey is an aboriginal species, we show that there exist traveling waves where the strong prey invades the environment and either replaces its weak counterpart, or more surprisingly the three species eventually co-exist. Furthermore, depending on the parameters, we can also construct traveling waves where the weaker prey actually invades the environment initially inhabited by its strong competitor and the predator. Finally, our results on the existence of traveling waves are sharp, in the sense that we find the minimal wave speed in all those situations.
description: Journal of Differential Equations, Elsevier, 2021
Schnabel, Wolfgang: Grundwissen zur Theologie- und Kirchengeschichte
Creators: name: Padberg, Lutz Von
Publisher: name: Jahrbuch für evangelikale Theologie
Year: 2025

description: 1822643635
description: Jahrbuch für evangelikale Theologie, V. 4 (1990): Jahrbuch für evangelikale Theologie, Band 4
An Atomtronic Flux Qubit: A ring lattice of Bose-Einstein condensates interrupted by three weak links
Creators: name: Aghamalyan, D.
name: Nguyen, N. T.
name: Auksztol, F.
name: Gan, K. S.
name: Valado, M. Martinez
name: Condylis, P. C.
name: Kwek, L. -C.
name: Dumke, R.
name: Amico, L.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We study a physical system consisting of a Bose-Einstein condensate confined to a ring shaped lattice potential interrupted by three weak links. The system is assumed to be driven by an effective flux piercing the ring lattice. By employing path integral techniques, we explore the effective quantum dynamics of the system in a pure quantum phase dynamics regime. Moreover, the effects of the density's quantum fluctuations are studied through exact diagonalization analysis of the spectroscopy of the Bose-Hubbard model. We demonstrate that a clear two-level system emerges by tuning the magnetic flux at degeneracy. The lattice confinement, platform for the condensate, is realized experimentally employing a spatial light modulator.
description: Accepted in New Journal of Physics
Constructing Data Graphs for Keyword Search
Creators: name: Golenberg, Konstantin
name: Sagiv, Yehoshua
Publisher: name: arXiv
Year: 2016
Subjects: subject: Databases (cs.DB)
subject: FOS: Computer and information sciences

description: A data graph is a convenient paradigm for supporting keyword search that takes into account available semantic structure and not just textual relevance. However, the problem of constructing data graphs that facilitate both efficiency and effectiveness of the underlying system has hardly been addressed. A conceptual model for this task is proposed. Principles for constructing good data graphs are explained. Transformations for generating data graphs from RDB and XML are developed. The results obtained from these transformations are analyzed. It is shown that XML is a better starting point for getting a good data graph.
description: Full version of DEXA'16 paper
The second closed geodesic, the fundamental group, and generic Finsler metrics
Creators: name: Rademacher, Hans-Bert
name: Taimanov, Iskander A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C22, 58E10

description: For compact manifolds with infinite fundamental group we present sufficient topological or metric conditions ensuring the existence of two geometrically distinct closed geodesics. We also show how results about generic Riemannian metrics can be carried over to Finsler metrics.
description: 15 pages, we added a comment on an application of the closing lemma in Section 3 and related references
Direct search for features in the primordial bispectrum
Creators: name: Appleby, Stephen
name: Gong, Jinn-Ouk
name: Hazra, Dhiraj Kumar
name: Shafieloo, Arman
name: Sypsas, Spyros
Publisher: name: arXiv
Year: 2015
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study features in the bispectrum of the primordial curvature perturbation correlated with the reconstructed primordial power spectrum from the observed cosmic microwave background temperature data. We first show how the bispectrum can be completely specified in terms of the power spectrum and its first two derivatives, valid for any configuration of interest. Then using a model-independent reconstruction of the primordial power spectrum from the Planck angular power spectrum of temperature anisotropies, we compute the bispectrum in different triangular configurations. We find that in the squeezed limit at k ~ 0.06/Mpc and k ~ 0.014/Mpc there are marginal 2sigma deviations from the standard featureless bispectrum, which meanwhile is consistent with the reconstructed bispectrum in the equilateral configuration.
description: (v1) 6 pages, 4 figures; (v2) improved results but conclusions not changed, to appear in Physics Letters B
Measurements as a roadblock to near-term practical quantum advantage in chemistry: resource analysis
Creators: name: Gonthier, Jérôme F.
name: Radin, Maxwell D.
name: Buda, Corneliu
name: Doskocil, Eric J.
name: Abuan, Clena M.
name: Romero, Jhonathan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Recent advances in quantum computing devices have brought attention to hybrid quantum-classical algorithms like the Variational Quantum Eigensolver (VQE) as a potential route to practical quantum advantage in chemistry. However, it is not yet clear whether such algorithms, even in the absence of device error, could actually achieve quantum advantage for systems of practical interest. We have performed an exhaustive analysis to estimate the number of qubits and number of measurements required to compute the combustion energies of small organic molecules and related systems to within chemical accuracy of experimental values using VQE. We consider several key modern improvements to VQE, including low-rank factorizations of the Hamiltonian. Our results indicate that although these techniques are useful, they will not be sufficient to achieve practical quantum computational advantage for our molecular set, or for similar molecules. This suggests that novel approaches to operator estimation leveraging quantum coherence, such as Enhanced Likelihood Functions [arxiv:2006.09350, arxiv:2006.09349], may be required.
description: 49 pages, 18 figures
Robustness of Model Predictions under Extension
Creators: name: Blom, Tineke
name: Mooij, Joris M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Methodology (stat.ME)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Mathematical models of the real world are simplified representations of complex systems. A caveat to using mathematical models is that predicted causal effects and conditional independences may not be robust under model extensions, limiting applicability of such models. In this work, we consider conditions under which qualitative model predictions are preserved when two models are combined. Under mild assumptions, we show how to use the technique of causal ordering to efficiently assess the robustness of qualitative model predictions. We also characterize a large class of model extensions that preserve qualitative model predictions. For dynamical systems at equilibrium, we demonstrate how novel insights help to select appropriate model extensions and to reason about the presence of feedback loops. We illustrate our ideas with a viral infection model with immune responses.
description: Forthcoming in Proceedings of the 38th Conference on Uncertainty in Artificial Intelligence (UAI 2022)
Homeostatic regulation of energetic arousal during acute social isolation-evidence from the lab and the field
Creators: name: Stijovic, Ana
name: Forbes, Paul
name: Tomova, Livia
name: Skoluda, Nadine
name: Feneberg, Anja
name: Piperno, Giulio
name: Pronizius, Ekaterina
name: Nater, Urs
name: Lamm, Claus
name: Silani, Giorgia
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Medicine and Health Sciences
subject: Life Sciences
subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology

description: Open data for the manuscript Stijovic et al. (2023), Homeostatic regulation of energetic arousal during acute social isolation - evidence from the lab and the field
Finite domination and Novikov homology over strongly Z-graded rings
Creators: name: Huettemann, Thomas
name: Steers, Luke
Publisher: name: arXiv
Year: 2016
Subjects: subject: K-Theory and Homology (math.KT)
subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: 18G35 (Primary), 16W50, 55U15 (Secondary)

description: Let L be a strongly Z-graded ring, and let C be a bounded chain complex of finitely generated L-modules. We give a homological characterisation of when C is homotopy equivalent, over L_0, to a bounded complex of finitely generated projective L_0-modules, generalising known results for twisted Laurent polynomial rings.
description: 22 pages; v2: changed example in introduction, and corrected minor misprints
Bienert, Wolfgang A. und Koch, Guntram: Kirchengeschichte I
Creators: name: Thiede, Carsten Peter
Publisher: name: Jahrbuch für evangelikale Theologie
Year: 2025

description: 182264156X
description: Jahrbuch für evangelikale Theologie, V. 4 (1990): Jahrbuch für evangelikale Theologie, Band 4
Ruhbach, Gerhard und Sudbrach, Josef (Hrsg.): Christliche Mystik
Creators: name: Schirrmacher, Thomas
Publisher: name: Jahrbuch für evangelikale Theologie
Year: 2025

description: 1822551269
description: Jahrbuch für evangelikale Theologie, V. 4 (1990): Jahrbuch für evangelikale Theologie, Band 4
Good elliptic curves with a specified torsion subgroup
Creators: name: Barrios, Alexander J.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11G05, 11D75, 11J25

description: An elliptic curve $E$ over $\mathbb{Q}$ is said to be good if $N_{E}^{6}<\max\!\left\{ \left\vert c_{4}^{3}\right\vert ,c_{6}^{2}\right\} $ where $N_{E}$ is the conductor of $E$ and $c_{4}$ and $c_{6}$ are the invariants associated to a global minimal model of $E$. In this article, we generalize Masser's Theorem on the existence of infinitely many good elliptic curves with full $2$-torsion. Specifically, we prove via constructive methods that for each of the fifteen torsion subgroups $T$ allowed by Mazur's Torsion Theorem, there are infinitely many good elliptic curves $E$ with $E\!\left(\mathbb{Q}\right) _{\text{tors}}\cong T$.
description: 19 pages; incorporates referee's suggestions; final version to appear in Journal of Number Theory
Ehalt, Hubert Ch. (Hrsg.): Volksfrömmigkeit
Creators: name: Padberg, Lutz Von
Publisher: name: Jahrbuch für evangelikale Theologie
Year: 2025

description: 1822551080
description: Jahrbuch für evangelikale Theologie, V. 4 (1990): Jahrbuch für evangelikale Theologie, Band 4