cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Hadronic matter under an external magnetic field: in medium modification of the pion mass
Creators: name: Aguirre, R.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The covariant propagator of a fermion with intrinsic magnetic moment interacting with a uniform external magnetic field is presented for finite temperature and baryonic density. The case of a scalar boson is also considered. The final expressions are given in terms of a four-dimensional momentum representation. These results, which take account of the full effect of the magnetic field, are used to evaluate the modification of the pion mass at zero temperature as a function of the density and the magnetic intensity. For this purpose a self-consistent calculation, including one- and two-pion vertices, is employed.
description: 30 pages, 7 figures, matches the published version
Proceedings of the Workshop Exploring National Infrastructure for Public Access Usage and Impact Reporting
Creators: name: Drummond, Christina
Publisher: name: Zenodo
Year: 2023

description: Proceedings of a workshop sponsored by the U.S. National Science Foundation and held in conjunction with the Coalition for Networked Information’s Spring Meeting at the Sheraton Denver in Denver, Colorado on April 2, 2023
 Edited by: Christina Drummond and Charles Watkinson
description: Acknowledgements: The organizers extend their gratitude to the organizations that made this workshop possible, including the National Science Foundation (NSF Award 2315721) and the Coalition for Networked Information.
Means Compatible with Semigroup Laws
Creators: name: Padmanabhan, R.
name: Shukla, Alok
Publisher: name: arXiv
Year: 2019
Subjects: subject: Group Theory (math.GR)
subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: A binary mean operation m(x,y) is said to be compatible with a semigroup law *, if * satisfies the Gauss' functional equation m(x,y) * m(x,y) = x * y for all x, y. Thus the arithmetic mean is compatible with the group addition in the set of real numbers, while the geometric mean is compatible with the group multiplication in the set of all positive real numbers. Using one of Jacobi's theta functions, Tanimoto has constructed a novel binary operation * corresponding to the arithmetic-geometric mean agm(x,y) of Gauss. Tanimoto shows that it is only a loop operation, but not associative. A natural question is to ask if there exist a group law * compatible with arithmetic-geometric mean. In this paper we prove that there is no semigroup law compatible with agm and hence, in particular, no group law either. Among other things, this explains why Tanimoto's novel operation * using theta functions must be non-associative.
description: 7 pages
Robin Gravity
Creators: name: Krishnan, Chethan
name: Maheshwari, Shubham
name: Subramanian, P. N. Bala
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We write down a Robin boundary term for general relativity. The construction relies on the Neumann result of arXiv:1605.01603 in an essential way. This is unlike in mechanics and (polynomial) field theory, where two formulations of the Robin problem exist: one with Dirichlet as the natural limiting case, and another with Neumann.
description: 10 pages. Contribution to the proceedings of the IF-YITP Symposium VI, Phitsanulok, Thailand. Aug 3-5, 2016. v2: very minor corrections to the proceedings published version
Star formation and AGN activity in a sample of local Luminous Infrared Galaxies through multi-wavelength characterization
Creators: name: Herrero-Illana, Rubén
name: Pérez-Torres, Miguel Á.
name: Randriamanakoto, Zara
name: Alberdi, Antxon
name: Efstathiou, Andreas
name: Väisänen, Petri
name: Kankare, Erkki
name: Kool, Erik
name: Mattila, Seppo
name: Ramphul, Rajin
name: Ryder, Stuart
Publisher: name: arXiv
Year: 2017
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Nuclear starbursts and AGN activity are the main heating processes in luminous infrared galaxies (LIRGs) and their relationship is fundamental to understand galaxy evolution. In this paper, we study the star-formation and AGN activity of a sample of 11 local LIRGs imaged with subarcsecond angular resolution at radio (8.4GHz) and near-infrared ($2.2μ$m) wavelengths. This allows us to characterize the central kpc of these galaxies with a spatial resolution of $\simeq100$pc. In general, we find a good spatial correlation between the radio and the near-IR emission, although radio emission tends to be more concentrated in the nuclear regions. Additionally, we use an MCMC code to model their multi-wavelength spectral energy distribution (SED) using template libraries of starburst, AGN and spheroidal/cirrus models, determining the luminosity contribution of each component, and finding that all sources in our sample are starburst-dominated, except for NGC6926 with an AGN contribution of $\simeq64$\%. Our sources show high star formation rates ($40$ to $167M_\odot\mathrm{yr}^{-1}$), supernova rates (0.4 to $2.0\mathrm{SN}\mathrm{yr}^{-1}$), and similar starburst ages (13 to $29\mathrm{Myr}$), except for the young starburst (9Myr) in NGC6926. A comparison of our derived star-forming parameters with estimates obtained from different IR and radio tracers shows an overall consistency among the different star formation tracers. AGN tracers based on mid-IR, high-ionization line ratios also show an overall agreement with our SED model fit estimates for the AGN. Finally, we use our wide-band VLA observations to determine pixel-by-pixel radio spectral indices for all galaxies in our sample, finding a typical median value ($α\simeq-0.8$) for synchrotron-powered LIRGs.
description: Accepted for publication in MNRAS. 20 pages, 12 figures
A quantum categorification of the Alexander polynomial
Creators: name: Robert, Louis-Hadrien
name: Wagner, Emmanuel
Publisher: name: arXiv
Year: 2019
Subjects: subject: Geometric Topology (math.GT)
subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics
subject: 57R56, 57M27, 17B10, 17B37, 17B35

description: Using a modified foam evaluation, we give a categorification of the Alexander polynomial of a knot. We also give a purely algebraic version of this knot homology which makes it appear as the infinite page of a spectral sequence starting at the reduced triply graded link homology of Khovanov--Rozansky.
description: v2: A technical Proposition was missing, now included as an Appendix. 57 pages, many figures. Comments welcome! v3: Some typos corrected. Introduction re-written
Composable code generation for high order, compatible finite element methods
Creators: name: Vorderwuelbecke, Sophia
Publisher: name: Imperial College London
Year: 2022

description: It has been widely recognised in the HPC communities across the world, that exploiting modern computer architectures, including exascale machines, to a full extent requires software commu- nities to adapt their algorithms. Computational methods with a high ratio of floating point op- erations to bandwidth are favorable. For solving partial differential equations, which can model many physical problems, high order finite element methods can calculate approximations with a high efficiency when a good solver is employed. Matrix-free algorithms solve the corresponding equations with a high arithmetic intensity. Vectorisation speeds up the operations by calculating one instruction on multiple data elements. Another recent development for solving partial differential are compatible (mimetic) finite ele- ment methods. In particular with application to geophysical flows, compatible discretisations ex- hibit desired numerical properties required for accurate approximations. Among others, this has been recognised by the UK Met office and their new dynamical core for weather and climate fore- casting is built on a compatible discretisation. Hybridisation has been proven to be an efficient solver for the corresponding equation systems, because it removes some inter-elemental coupling and localises expensive operations. This thesis combines the recent advances on vectorised, matrix-free, high order finite element methods in the HPC community on the one hand and hybridised, compatible discretisations in the geophysical community on the other. In previous work, a code generation framework has been developed to support the localised linear algebra required for hybridisation. First, the framework is adapted to support vectorisation and further, extended so that the equations can be solved fully matrix-free. Promising performance results are completing the thesis.
Check-Operators and Quantum Spectral Curves
Creators: name: Mironov, Andrei
name: Morozov, Alexei
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We review the basic properties of effective actions of families of theories (i.e., the actions depending on additional non-perturbative moduli along with perturbative couplings), and their description in terms of operators (called check-operators), which act on the moduli space. It is this approach that led to constructing the (quantum) spectral curves and what is now nicknamed the EO/AMM topological recursion. We explain how the non-commutative algebra of check-operators is related to the modular kernels and how symplectic (special) geometry emerges from it in the classical (Seiberg-Witten) limit, where the quantum integrable structures turn into the well studied classical integrability. As time goes, these results turn applicable to more and more theories of physical importance, supporting the old idea that many universality classes of low-energy effective theories contain matrix model
Included systematic reviews
Creators: name: Spineli, Loukia
name: Kalyvas, Chrysostomos
name: Yepes-Nuñez, Juan J.
name: Mauricio García Sierra, Andrés
name: C. Rivera-Pinzón, Diana
name: Seide, Svenja E.
name: Papadimitropoulou, Katerina
Publisher: name: figshare
Year: 2023
Subjects: Other health sciences not elsewhere classified

description: Systematic reviews considered in the manuscript entitled 'Low awareness of the transitivity assumption in complex networks of interventions: a systematic survey from 721 network meta-analyses'
Supplementary Information from Critical rates of climate warming and abrupt collapse of ecosystems
Creators: name: Kaur, Taranjot
name: Sharathi Dutta, Partha
Publisher: name: The Royal Society
Year: 2022
Subjects: subject: 10109 Ordinary Differential Equations, Difference Equations and Dynamical Systems
subject: FOS: Mathematics
subject: 10110 Partial Differential Equations
subject: 10299 Applied Mathematics not elsewhere classified
subject: 10302 Numerical Solution of Differential and Integral Equations
subject: 19999 Mathematical Sciences not elsewhere classified

description: Critical rates of climate warming and abrupt collapse of ecosystems
New Physics in $b \to s μ^+ μ^-$ after the Measurement of $R_{K^*}$
Creators: name: Alok, Ashutosh Kumar
name: Bhattacharya, Bhubanjyoti
name: Datta, Alakabha
name: Kumar, Dinesh
name: Kumar, Jacky
name: London, David
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The recent measurement of $R_{K^*}$ is yet another hint of new physics (NP), and supports the idea that it is present in $b\to sμ^+μ^-$ decays. We perform a combined model-independent and model-dependent analysis in order to deduce properties of this NP. Like others, we find that the NP must obey one of two scenarios: (I) $C_9^{μμ}({\rm NP}) < 0$ or (II) $C_9^{μμ}({\rm NP}) = - C_{10}^{μμ}({\rm NP}) < 0$. A third scenario, (III) $C_9^{μμ}({\rm NP}) = - C_{9}^{\prime μμ}({\rm NP})$, is rejected largely because it predicts $R_K = 1$, in disagreement with experiment. The simplest NP models involve the tree-level exchange of a leptoquark (LQ) or a $Z'$ boson. We show that scenario (II) can arise in LQ or $Z'$ models, but scenario (I) is only possible with a $Z'$. Fits to $Z'$ models must take into account the additional constraints from $B^0_s$-${\bar B}^0_s$ mixing and neutrino trident production. Although the LQs must be heavy, O(TeV), we find that the $Z'$ can be light, e.g., $M_{Z'} = 10$ GeV or 200 MeV.
description: 18 pages, 1 figure; final version accepted for publication in Physical Review D
Discretizing the Bistability of Mode-Locked Electron Spin Precession: An Overhauser Field Hysteresis Manifestation
Creators: name: Kesto, Estefanio
name: Dominguez, Michael J.
name: Sih, Vanessa
Publisher: name: arXiv
Year: 2024
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Electron-nuclear spin interactions by pulsed optical pumping have been found to polarize the nuclear spin system, leading to the nuclei building up an intrinsic magnetic field known as the Overhauser field. Studies have indicated an Overhauser field hysteresis effect dependent on the sweep direction of an externally applied magnetic field in negatively detuned periodically pumped Si-doped GaAs. Although predictions of bistable mode-locked electron spin precession frequency modes have been made for systems exhibiting this hysteresis, there have been no reports on the experimental observation of said bistable spin precession modes. This letter details the evolution of bistable Overhauser field solutions leading to a hysteretic effect in negatively detuned optical excitation of Si-doped GaAs by magneto-optic pump-probe spectroscopy and investigates the resulting consequence of this hysteresis acting on the electron spin system. One manifestation of the Overhauser field hysteresis acting on the electron spin system leads to the discretization of bistable mode-locked electron spin precession modes within a given band of externally applied magnetic field. A method for preferentially accessing the two different and stable mode-locked spin precession modes within a given band of externally applied magnetic field is outlined, which may be of interest for communities utilizing electron and nuclear spins for information processing protocols.
Time evolution of concentrated vortex rings
Creators: name: Buttà, Paolo
name: Marchioro, Carlo
Publisher: name: arXiv
Year: 2019
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 76B47, 37N10

description: We study the time evolution of an incompressible fluid with axisymmetry without swirl when the vorticity is sharply concentrated. In particular, we consider $N$ disjoint vortex rings of size $\varepsilon$ and intensity of the order of $|\log\varepsilon|^{-1}$. We show that in the limit $\varepsilon\to 0$, when the density of vorticity becomes very large, the movement of each vortex ring converges to a simple translation, at least for a small but positive time.
description: 24 pages. This updated version provides a new Appendix B, containing the corrected proof of Lemma 3.1. For the sake of clarity, this proof has already been included in arXiv:2102.07807 (where the results of this article have been extended)
Fate of the spin-\frac{1}{2} Kondo effect in the presence of temperature gradients
Creators: name: Sierra, Miguel A.
name: Sanchez, David
name: Lopez, Rosa
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We consider a strongly interacting quantum dot connected to two leads held at quite different temperatures. Our aim is to study the behavior of the Kondo effect in the presence of large thermal biases. We use three different approaches, namely, a perturbation formalism based on the Kondo Hamiltonian, a slave-boson mean-field theory for the Anderson model at large charging energies and a truncated equation-of-motion approach beyond the Hartree-Fock approximation. The two former formalisms yield a suppression of the Kondo peak for thermal gradients above the Kondo temperature, showing a remarkably good agreement despite their different ranges of validity. The third technique allows us to analyze the full density of states within a wide range of energies. Additionally, we have investigated the quantum transport properties (electric current and thermocurrent) beyond linear response. In the voltage-driven case, we reproduce the split differential conductance due to the presence of different electrochemical potentials. In the temperature-driven case, we observe a strongly nonlinear thermocurrent as a function of the applied thermal gradient. Depending on the parameters, we can find nontrivial zeros in the electric current for finite values of the temperature bias. Importantly, these thermocurrent zeros yield direct access to the system's characteristic energy scales (Kondo temperature and charging energy).
description: 14 pages, 11 figures, revised version
When do we have 1 + 1 = 11 and 2 + 2 =5?
Creators: name: Padmanabhan, R.
name: Shukla, Alok
Publisher: name: arXiv
Year: 2019
Subjects: subject: History and Overview (math.HO)
subject: FOS: Mathematics
subject: 11Z05, 11D99

description: The phrase "$ 2+2=5 $" is a cliché or a slogan used in political speeches, propaganda, or literature, most notably in the novel "$ 1984 $" by George Orwell. More recently, we came across a You-Tube short film comedy, Alternative Math, produced by IdeaMan Studios (see \cite{Danny}). It is a hilarious exaggeration of a teacher who is dragged through the mud for teaching that $ 2+2=4 $ and not $ 22 $, as Danny, a young student, kept on insisting. In the movie, Danny and the whole community sincerely believe $ 1+1=11 $ and $ 2+2=22 $. Jokes aside, we ask the question whether a polynomially defined group law "$\oplus$" defined over the field of rationals such that $ 1\oplus1=u $ and $ 2 \oplus2=v $ can simultaneously be satisfied for arbitrary integers $u$ and $ v $. Answer to this question takes us through a fascinating journey from Brahmagupta all the way to the modern works of Louis Joel Mordell and Ramanujan!
description: A math article that quotes both Orwell and Dostoevsky!
Optimal destabilization of K-unstable Fano varieties via stability thresholds
Creators: name: Blum, Harold
name: Liu, Yuchen
name: Zhou, Chuyu
Publisher: name: arXiv
Year: 2019
Subjects: subject: Algebraic Geometry (math.AG)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 14J45, 14J10, 32Q20

description: We show that for a K-unstable Fano variety, any divisorial valuation computing its stability threshold induces a non-trivial special test configuration preserving the stability threshold. When such a divisorial valuation exists, we show that the Fano variety degenerates to a uniquely determined twisted K-polystable Fano variety. We also show that the stability threshold can be approximated by divisorial valuations induced by special test configurations. As an application of the above results and the analytic work of Datar, Székelyhidi, and Ross, we deduce that greatest Ricci lower bounds of Fano manifolds of fixed dimension form a finite set of rational numbers. As a key step in the proofs, we adapt the process of Li and Xu producing special test configurations to twisted K-stability in the sense of Dervan.
description: Final version, to appear in Geom. Topol
Energy transport in a free Euler-Bernoulli beam in terms of Schrödinger's wave function
Creators: name: Gavrilov, Serge N.
name: Krivtsov, Anton M.
name: Shishkina, Ekaterina V.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Mathematical Physics (math-ph)
subject: Classical Physics (physics.class-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The Schrödinger equation is not frequently used in the framework of the classical mechanics, though historically this equation was derived as a simplified equation, which is equivalent to the classical Germain-Lagrange dynamic plate equation. The question concerning the exact meaning of this equivalence is still discussed in modern literature. In this note, we consider the one-dimensional case, where the Germain-Lagrange equation reduces to the Euler-Bernoulli equation, which is used in the classical theory of a beam. We establish a one-to-one correspondence between the set of all solutions (i.e., wave functions $ψ$) of the 1D time-dependent Schrödinger equation for a free particle with arbitrary complex valued initial data and the set of ordered pairs of quantities (the beam strain and the particle velocity), which characterize solutions $u$ of the beam equation with arbitrary real valued initial data. Thus, the dynamics of a free infinite Euler-Bernoulli beam can be described by the Schrödinger equation for a free particle and vice versa. Finally, we show that for two corresponding solutions $u$ and $ψ$ the mechanical energy density calculated for $u$ propagates in the beam exactly in the same way as the probability density calculated for $ψ$.
description: 5 pages
Heat perturbations spreading in the Fermi-Pasta-Ulam-$β$ system with next-nearest-neighbor coupling: Competition between phonon dispersion and nonlinearity
Creators: name: Xiong, Daxing
Publisher: name: arXiv
Year: 2017
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We employ the heat perturbations correlation function to study thermal transport in the one-dimensional (1D) Fermi-Pasta-Ulam-$β$ lattice with both nearest-neighbor and next-nearest-neighbor couplings. We find that such a system bears a peculiar phonon dispersion relation, and thus there exists a competition between phonon dispersion and nonlinearity that can strongly affect the heat correlation function' shape and scaling property. Specifically, for small and large anharmoncity, the scaling laws are ballistic and superdiffusive types, respectively, which are in good agreement with the recent theoretical predictions; whereas in the intermediate range of the nonlinearity, we observe an unusual multiscaling property characterized by a \emph{nonmonotonic} delocalization process of the central peak of the heat correlation function. To understand this multiscaling laws, we also examine the momentum perturbations correlation function and find a transition process with the same turning point of the anharmonicity as that shown in the heat correlation function. This suggests coupling between the momentum transport and the heat transport, in agreement with the theoretical arguments of mode cascade theory.
description: 9 pages, 11 figures
Thrinchostoma orchidarum Cockerell 1908
Creators: name: Pauly, Alain
name: Eardley, Connal
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Halictidae
Thrinchostoma
Thrinchostoma orchidarum

description: Thrinchostoma orchidarum Cockerell, 1908
(Figs 41, 42)
 Thrinchostoma orchidarum Cockerell, 1908c: 343, ♂. Male holotype: Angola, Benguella, I.1908 (BMNH). Cockerell, 1910: 506; Cockerell, 1933: 25; Cockerell, 1936: 8.
 Thrincostoma [!] (Thrincostoma [!]) orchidarum Cockerell: Blüthgen, 1930: 496–497, 499, 504, 536.
 Thrinchostoma (Thrinchostoma) orchidarum Cockerell: Michener, 1978: 521, 254; Pauly, 1999: 155, 17.
DIAGNOSIS. The male of this species is very distinct. The antennae have 13 segments, and the last segment is not bent. The hind tibiae are very broad and covered with a dense grey tomentum (fig. 42e). Sternite 5 has a dense apical fringe of setae (fig. 42f).
Female: unknown.
MATERIAL. MALAWI. 100km S. Kasungu, 29.XI.2001, 1♂, leg. J. Halada (OOL).
description: Published as part of Pauly, Alain & Eardley, Connal, 2013, A Revision of Afrotropical Thrinchostoma de Saussure, 1890 (Hymenoptera: Apoidea: Halictidae), pp. 1-76 in Belgian Journal of Entomology 12 on page 40, DOI: 10.5281/zenodo.13486944
Mesonic and nucleon fluctuation effects at finite baryon density
Creators: name: Fejos, G.
name: Hosaka, A.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Mesonic and nucleon fluctuation effects are investigated in medium. We couple the nucleon field to the $2+1$ flavor meson model and investigate the finite temperature and density behavior of the system, in particular, the axial anomaly function. Somewhat contrary to earlier expectations we find that it tends to strengthen at finite density. At lower temperatures nucleon density fluctuations can cause a relative difference in the $U_A(1)$ axial anomaly of about $20\%$. This has important consequences on the mesonic spectra, especially on the $η-η'$ system, as we observe no drop in the $η'$ mass as a function of the baryochemical potential, irrespective of the temperature. Based on the details of chiral symmetry restoration, it is argued that there has to be a competition between underlying QCD effects of the anomaly and fluctuations of the low energy hadronic degrees of freedom, and the fate of the $U_A(1)$ coefficient should be decided by taking into account both effects simultaneously.
description: 9 pages, 4 figures, matches published version
Power Spectrum of Long Eigenlevel Sequences in Quantum Chaotic Systems
Creators: name: Riser, Roman
name: Osipov, Vladimir Al.
name: Kanzieper, Eugene
Publisher: name: arXiv
Year: 2017
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a non-perturbative analysis of the power-spectrum of energy level fluctuations in fully chaotic quantum structures. Focussing on systems with broken time-reversal symmetry, we employ a finite-$N$ random matrix theory to derive an exact multidimensional integral representation of the power-spectrum. The $N\rightarrow \infty$ limit of the exact solution furnishes the main result of this study -- a universal, parameter-free prediction for the power-spectrum expressed in terms of a fifth Painlevé transcendent. Extensive numerics lends further support to our theory which, as discussed at length, invalidates a traditional assumption that the power-spectrum is merely determined by the spectral form factor of a quantum system.
description: 5 pages, 1 fugure; PRL Editors' Suggestion
Some aspects of the inertial spin model for flocks and related kinetic equations
Creators: name: Benedetto, Dario
name: Buttà, Paolo
name: Caglioti, Emanuele
Publisher: name: arXiv
Year: 2019
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 60K35, 82B40, 92D50

description: In this paper we study the macroscopic behavior of the inertial spin (IS) model. This model has been recently proposed to describe the collective dynamics of flocks of birds, and its main feature is the presence of an auxiliary dynamical variable, a sort of internal spin, which conveys the interaction among the birds with the effect of better describing the turning of flocks. After discussing the geometrical and mechanical properties of the IS model, we show that, in the case of constant interaction among the birds, its mean-field limit is described by a non-linear Fokker-Planck equation, whose equilibria are fully characterized. Finally, in the case of non-constant interactions, we derive the kinetic equation for the mean-field limit of the model in the absence of thermal noise, and explore its macroscopic behavior by analyzing the mono-kinetic solutions.
description: 29 pages
The Spheres of Sol
Creators: name: Coiculescu, Matei P.
name: Schwartz, Richard Evan
Publisher: name: arXiv
Year: 2019
Subjects: subject: Differential Geometry (math.DG)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics

description: Let Sol be the three-dimensional solvable Lie group equipped with its standard left-invariant Riemannian metric. We give a precise description of the cut locus of the identity, and a maximal domain in the Lie algebra on which the Riemannian exponential map is a diffeomorphism. As a consequence, we prove that the metric spheres in Sol are topological spheres, and we characterize their singular points almost exactly.
description: 36 pages, 6 figures. This version is a revision. We revised it according to the referee reports from our Geometry&Topology submission of the first version. The exposition is somewhat cleaner, especially in Chapter 3, and we have added some new diagrams and computer plots
Wick rotation for D-modules
Creators: name: Schapira, Pierre
Publisher: name: arXiv
Year: 2017
Subjects: subject: Algebraic Geometry (math.AG)
subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 35A27, 58J15, 58J45, 81T20

description: We extend the classical Wick rotation to D-modules and higher codimensional submanifolds.
description: To appear in "Mathematical Physics, Analysis and Geometry"
Monoidal abelian envelopes and a conjecture of Benson--Etingof
Creators: name: Coulembier, Kevin
name: Entova-Aizenbud, Inna
name: Heidersdorf, Thorsten
Publisher: name: arXiv
Year: 2019
Subjects: subject: Representation Theory (math.RT)
subject: Category Theory (math.CT)
subject: FOS: Mathematics

description: We give several criteria to decide whether a given tensor category is the abelian envelope of a fixed symmetric monoidal category. As a main result we prove that the category of finite-dimensional representations of a semisimple simply connected algebraic group is the abelian envelope of the category of tilting modules. Benson and Etingof conjectured that a certain limit of finite symmetric tensor categories is tensor equivalent to the finite dimensional representations of $SL_2$ in characteristic $2$. We use our results on the abelian envelopes to prove this conjecture and its variants for any prime $p$.
description: ver 3: Generalized the results to arbitrary primes p (ver 1,2 dealt with the case p=2), ver 2: minor fix in the definition of abelian envelope
Can Dips of Boyajian's Star be Explained by Circumsolar Rings?
Creators: name: Katz, J. I.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Could the dips of "Boyajian's Star" (KIC 8462852) have been caused by matter in our Solar System? The interval between periods of deep dips is nearly twice the orbital period of the Kepler satellite. I consider heliocentric obscuring rings in the outer Solar System that graze the line of sight to the star once per orbit of Kepler. The hypothesis predicts that future dips may be observed from Earth during windows separated by a year, although their detailed structure depends on the distribution of particles along the ring. Dips observed at terrestrial sites separated by > 1000 km in a direction perpendicular to the Earth's orbital motion may be uncorrelated.
description: 6 pages, 4 figures; revised and expanded
Huygens' principle and Dirac-Weyl equation
Creators: name: Pascazio, Saverio
name: Pepe, Francesco V.
name: Pérez-Pardo, Juan Manuel
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the validity of Huygens' principle for forward propagation in the massless Dirac-Weyl equation. The principle holds for odd space dimension n, while it is invalid for even n. We explicitly solve the cases n=1,2 and 3 and discuss generic $n$. We compare with the massless Klein-Gordon equation and comment on possible generalizations and applications.
description: 7 pages, 1 figure
Engineering of the topological magnetic moment of electrons in bilayer graphene using strain and electrical bias
Creators: name: Moulsdale, Christian
name: Knothe, Angelika
name: Fal'ko, Vladimir
Publisher: name: arXiv
Year: 2019
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Topological properties of electronic states in multivalley two-dimensional materials, such as mono- and bilayer graphene, or thin films of rhombohedral graphite, give rise to various unusual magneto-transport regimes. Here, we investigate the tunability of the topological magnetic moment (related to the Berry curvature) of electronic states in bilayer graphene using strain and vertical bias. We show how one can controllably vary the valley $g$-factor of the band-edge electrons, $g_v^*$, across the range $10 < |g_v^*| < 200$, and we discuss the manifestations of the topological magnetic moment in the anomalous contribution towards the Hall conductivity and in the Landau level spectrum.
description: 6 pages, 5 figures
The Hausdorff measure version of Gallagher's theorem -- closing the gap and beyond
Creators: name: Hussain, Mumtaz
name: Simmons, David
Publisher: name: arXiv
Year: 2016
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: In this paper we prove an upper bound on the "size" of the set of multiplicatively $ψ$-approximable points in $\mathbb R^d$ for $d>1$ in terms of $f$-dimensional Hausdorff measure. This upper bound exactly complements the known lower bound, providing a "zero-full" law which relates the Hausdorff measure to the convergence/divergence of a certain series in both the homogeneous and inhomogeneous settings. This zero-full law resolves a question posed by Beresnevich and Velani (2015) regarding the "log factor" discrepancy in the convergent/divergent sum conditions of their theorem. We further prove the analogous result for the multiplicative doubly metric setup.
description: In the revised version we have fixed some typos, added an example on page 2 and stated the slicing lemma on page 6
Competitive binding of aristolochic acid between various cyclodextrins and serum albumin as a model for acute poisoning detoxification
Creators: name: Gazdek, Nika
name: Zonjić, Iva
name: Nikšić-Franjić, Ivana
name: Frkanec, Leo Leo
name: Piantanida, Ivo
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biophysics
subject: Biochemistry
subject: Medicine
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Pharmacology
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Cancer
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: We showed that aristolochic acid toxin (ARI) and its fluorescent analogue form inclusion complexes with various cyclodextrins (CDs), including the clinically used γ-CD: Sugammadex. The binding affinity of ARI towards CDs varied on a CD size and rim modifications, whereby the stability of ARI/Sugammadex complex was 2-fold greater than ARI binding to serum albumin (BSA), blood protein well-known as a transporter of small molecules and similar to the ARI complex with ds-DNA. Molecular modelling supported the formation of ARI/ Sugammadex complex with carboxyl group of ARI exposed to water and ARI-condensed aromatic moiety deeply immersed into CD-cavity. These results are a proof-of-concept that CDs could be used as a first aid upon acute intoxication with ARI by binding larger part of the toxin in competition with serum albumin or ds-DNA and significantly reducing ARI absorption in the organism, similarly as Sugammadex extracts drugs from blood to stop their bioactivity.
No additional tournaments are quasirandom-forcing
Creators: name: Hancock, Robert
name: Kabela, Adam
name: Kral, Daniel
name: Martins, Taisa
name: Parente, Roberto
name: Skerman, Fiona
name: Volec, Jan
Publisher: name: arXiv
Year: 2019
Subjects: subject: Combinatorics (math.CO)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: A tournament H is quasirandom-forcing if the following holds for every sequence (G_n) of tournaments of growing orders: if the density of H in G_n converges to the expected density of H in a random tournament, then (G_n) is quasirandom. Every transitive tournament with at least 4 vertices is quasirandom-forcing, and Coregliano et al. [Electron. J. Combin. 26 (2019), P1.44] showed that there is also a non-transitive 5-vertex tournament with the property. We show that no additional tournament has this property. This extends the result of Bucic et al. [Combinatorica 41 (2021), 175-208] that the non-transitive tournaments with seven or more vertices do not have this property.
Cucker-Smale type dynamics of infinitely many individuals with repulsive forces
Creators: name: Buttà, Paolo
name: Marchioro, Carlo
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 82C22 (Primary) 92D25, 37N25 (Secondary)

description: We study the existence and uniqueness of the time evolution of a system of infinitely many individuals, moving in a tunnel and subjected to a Cucker-Smale type alignment dynamics with compactly supported communication kernels and to short-range repulsive interactions to avoid collisions.
description: 13 pages
Applications of an intersection formula to dual cones
Creators: name: Virosztek, Dániel
Publisher: name: arXiv
Year: 2017
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: Primary: 43A25, secondary: 43A35

description: We give a succinct proof of a duality theorem obtained by Révész in 1991 which concerns extremal quantities related to trigonomertic polynomials. The key tool of our new proof is an intersection formula on dual cones in real Banach spaces. We show another application of this intersection formula which is related to the integral estimates of non-negative positive definite functions.
description: v2: title changed and two remarks added (this version is close to the published one)
Module structure of the homology of right-angled Artin kernels
Creators: name: Bartolo, E. Artal
name: Cogolludo-Agustín, J. I.
name: de Medrano, S. López
name: Matei, D.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Group Theory (math.GR)
subject: Combinatorics (math.CO)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 20F36, 20F65, 57M07, 57M10, 20J05, 05C69

description: In this paper, we study the module structure of the homology of Artin kernels, i.e., kernels of non-resonant characters from right-angled Artin groups onto the integer numbers, the module structure being with respect to the ring $\mathbb{K}[t^{\pm 1}]$, where $\mathbb{K}$ is a field of characteristic zero. Papadima and Suciu determined some part of this structure by means of the flag complex of the graph of the Artin group. In this work, we provide more properties of the torsion part of this module, e.g., the dimension of each primary part and the maximal size of Jordan forms (if we interpret the torsion structure in terms of a linear map). These properties are stated in terms of homology properties of suitable filtrations of the flag complex and suitable double covers of an associated toric complex.
description: 24 pages, 6 figures
$μ$SR study of noncentrosymmetric superconductor PbTaSe$_2$
Creators: name: Wilson, M. N.
name: Hallas, A. M.
name: Cai, Y.
name: Guo, S.
name: Gong, Z.
name: Sankar, R.
name: Chou, F. C.
name: Uemura, Y. J.
name: Luke, G. M.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We present muon spin rotation ($μ$SR) measurements on the noncentrosymmetric superconductor PbTaSe$_2$. From measurements in an applied transverse field between $H_{c1}$ and $H_{c2}$, we extract the superfluid density as a function of temperature in the vortex state. This data can be fit with a fully gapped two-band model, consistent with previous evidence from ARPES, thermal conductivity, and resistivity. Furthermore, zero field measurements show no evidence for a time reversal symmetry breaking field greater than 0.05~G in the superconducting state. This makes exotic fully gapped spin-triplet states unlikely, and hence we contend that PbTaSe$_2$ is characterized by conventional BCS s-wave superconductivity in multiple bands.
description: 6 pages, 7 figures
title: Инженерная геодезия
Creators: name: ELS IPR BOOKS
Publisher: name: Липецкий государственный технический университет, Профобразование
Year: 2023

description: В учебно-методическом пособии рассмотрены вопросы решения плановых и высотных задач на топографических планах и картах. Приведены методические материалы для изучения основных геодезических приборов; показано выполнение ряда расчетно-графических работ по результатам теодолитной съемки с вычислением координат замкнутого полигона и построением ситуационного плана участка местности. Изложены вопросы полевого трассирования и проектирования профиля автомобильной дороги, нивелирования поверхности с разработкой картограммы земляных работ. Особое внимание уделено расчету разбивочных элементов при выносе зданий и сооружений в натуру. Издание содержит задания и исходные данные для 20 вариантов расчетно-графических работ, методические указания по выполнению и требования к оформлению расчетов и графического материала. Подготовлено в соответствии с требованиями Федерального государственного образовательного стандарта среднего профессионального образования. Предназначено для изучения дисциплин «Инженерная геодезия», «Геодезия», «Основы геодезии» по укрупненным группам специальностей 08.00.00 «Техника и технологии строительства», 21.00.00 «Прикладная геология, горное дело, нефтегазовое дело и геодезия».
Application of pyrrolidinomethylcalix[4]arene coated silica adsorbent for the removal of Chicago sky blue 6B dye from water samples: Equilibrium and computational modelling studies
Creators: name: Junejo, Ranjhan
name: Jalbani, Nida Shams
name: Kaya, Savaş
name: Erkan, Sultan
name: Ebenso, Eno E
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biophysics
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Inorganic Chemistry

description: In this study, silica surface has been coated using pyrrolidinomethylcalix[4]arene through the chemical modification of silanol groups. The pyrrolidinomethylcalix[4]arene-coated silica (PCS) adsorbent was characterized using the Fourier transform infrared and scanning electron microscopic technique. The adsorptive removal efficiency of PCS adsorbent was checked through batch studies with various effective parameters such adsorbent dose, pH, and temperature. During experiments, it has been observed that maximum adsorption was achieved in acidic to neutral pH and 25 mg.L−1 of PCS dose, while the kinetic models demonstrates that the pseudo 2nd order equation was the best fit (R2 0.99). The thermodynamic experiments described that the reaction is exothermic and spontaneous. Furthermore, equilibrium models were applied on experimental data and it has been noticed that the equilibrium data was best-fitted with Langmuir isotherm model (R2 0.99). The DFT analysis of dye molecule is helpful to examine the chemical interaction sites of absorbent and adsorbent using B3LYP/LANL2DZ/6-311++G (d,p) level using G09W software.
The stability of relativistic stars and the role of the adiabatic index
Creators: name: Moustakidis, Ch. C.
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study the stability of three analytical solutions of the Einstein's field equations for spheres of fluid. These solutions are suitable to describe compact objects including white dwarfs, neutron stars and supermassive stars and they have been extensively employed in the literature. We re-examine the range of stability of the Tolman VII solution, we focus on the stability of the Buchdahl solution which is under contradiction in the literature and we examine the stability of the Nariai IV solution. We found that all the mentioned solutions are stable in an extensive range of the compactness parameter. We also concentrate on the effect of the adiabatic index on the instability condition. We found that the critical adiabatic index, depends linearly on the ratio of central pressure over central energy density $P_c/{\cal E}_c$, up to high values of the compactness. Finally, we examine the possibility to impose constraints, via the adiabatic index, on realistic equations of state in order to ensure stable configurations of compact objects.
description: 17 pages, 14 figures, 2 tables
Orchards in elliptic curves over finite fields
Creators: name: Padmanabhan, R.
name: Shukla, Alok
Publisher: name: arXiv
Year: 2020
Subjects: subject: Number Theory (math.NT)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 52C30, 14Q05

description: Consider a set of $ n $ points on a plane. A line containing exactly $ 3 $ out of the $ n $ points is called a $ 3 $-rich line. The classical orchard problem asks for a configuration of the $ n $ points on the plane that maximizes the number of $ 3 $-rich lines. In this note, using the group law in elliptic curves over finite fields, we exhibit several (infinitely many) group models for orchards wherein the number of $ 3 $-rich lines agrees with the expected number given by Green-Tao (or, Burr, Grünbaum and Sloane) formula for the maximum number of lines. We also show, using elliptic curves over finite fields, that there exist infinitely many point-line configurations with the number of $ 3 $-rich lines exceeding the expected number given by Green-Tao formula by two, and this is the only other optimal possibility besides the case when the number of $ 3 $-rich lines agrees with the Green-Tao formula.
description: 15 pages
Universally optimizable strategy for magnetic gaps towards high-temperature quantum anomalous Hall states via magnetic-insulator/topological-insulator building-blocks
Creators: name: Li, Zhe
name: Xue, Feng
name: Tang, Xin-Yi
name: Hong, Xiyu
name: Chen, Yang
name: Feng, Xiao
name: He, Ke
Publisher: name: arXiv
Year: 2024
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Optimizing the magnetic Zeeman-splitting term, specifically the magnetic gap of the topological surface states (TSSs), is a crucial issue and central challenge in advancing higher-temperature quantum anomalous Hall (QAH) states. In this work, we demonstrate a counterintuitive, nonmonotonic relationship between the magnetic gap and the hybridization strength in ferromagnetic-insulator (FMI)/topological-insulator (TI) sandwich structures. Concretely, insufficient hybridization strength fails to induce a substantial magnetic gap; while excessive hybridization incandesces the competition between kinetic and Coulomb exchange interactions, thereby reducing the gap. Strong hybridization strength also spatially delocalizes the TSSs, diminishing the effective orbital coupling between TSS-based p and magnetic d orbitals, which further weakens kinetic and Coulomb exchange interaction strength. Moreover, modifying the stacking order offers an experimentally viable approach to optimizing magnetic gaps, enabling the tunability of Chern numbers, chirality and maximizing global gaps. These findings unveil a universal guiding principle for optimizing magnetic gaps in FMI-TI proximity-based QAH systems, offering valuable insights for advancing experimental implementations in this field.
description: 37 pages, 31 figures