Recent zbMATH articles in MSC 81Vhttps://zbmath.org/atom/cc/81V2022-11-17T18:59:28.764376ZUnknown authorWerkzeugBeyond Bogoliubov dynamicshttps://zbmath.org/1496.353322022-11-17T18:59:28.764376Z"Boßmann, Lea"https://zbmath.org/authors/?q=ai:bossmann.lea"Petrat, Sören"https://zbmath.org/authors/?q=ai:petrat.soren"Pickl, Peter"https://zbmath.org/authors/?q=ai:pickl.peter"Soffer, Avy"https://zbmath.org/authors/?q=ai:soffer.avrahamThe starting point of the investigations of the authors is the model describing bosons in the mean-field or Hartree regime. This is characterized by weak, long-range interactions. The authors construct a norm approximation such that all corrections to correlation functions and expectation values of bounded operators are given in terms of the two-point correlation functions of a quasifree state. The advantage of their construction that it reduces the complexity of the \(N\)-body problem and makes it possible to numerical calculate these quantities to arbitrary precision. Hence the computation of the higher-order corrections reduces to solve first the well-studied Hartree equation and second the Bogoliubov equation. The second is equivalent to solving a \(2 \times 2\) matrix differential equation. Moreover, the \(N\)-independent corrections fulfill a generalized form of Wick's theorem.
Reviewer: Ágota Figula (Debrecen)On the Laughlin function and its perturbationshttps://zbmath.org/1496.353342022-11-17T18:59:28.764376Z"Rougerie, Nicolas"https://zbmath.org/authors/?q=ai:rougerie.nicolasSummary: The Laughlin state is an ansatz for the ground state of a system of 2D quantum particles submitted to a strong magnetic field and strong interactions. The two effects conspire to generate strong and very specific correlations between the particles.
I present a mathematical approach to the rigidity these correlations display in their response to perturbations. This is an important ingredient in the theory of the fractional quantum Hall effect. The main message is that potentials generated by impurities and residual interactions can be taken into account by generating uncorrelated quasi-holes on top of Laughlin's wave-function.
An appendix contains a conjecture (not due to me) that should be regarded as a major open mathematical problem of the field, relating to the spectral gap of a certain zero-range interaction.
Expository text based on joint works with Elliott H. Lieb, Alessandro Olgiati, Sylvia Serfaty and Jakob Yngvason.Bogoliubov theory for many-body quantum systemshttps://zbmath.org/1496.353352022-11-17T18:59:28.764376Z"Schlein, Benjamin"https://zbmath.org/authors/?q=ai:schlein.benjaminSummary: We review some recent applications of rigorous Bogoliubov theory. We show how Bogoliubov theory can be used to approximate quantum fluctuations, both in the analysis of the energy spectrum and in the study of the dynamics of many-body quantum systems.
For the entire collection see [Zbl 1465.35005].Uniform error bounds of an exponential wave integrator for the long-time dynamics of the nonlinear Klein-Gordon equationhttps://zbmath.org/1496.651782022-11-17T18:59:28.764376Z"Feng, Yue"https://zbmath.org/authors/?q=ai:feng.yue"Yi, Wenfan"https://zbmath.org/authors/?q=ai:yi.wenfanNonlinear dynamic modeling for high temperature superconductivity in nanocluster topological structures on solid surfacehttps://zbmath.org/1496.780122022-11-17T18:59:28.764376Z"Arakelian, Sergei M."https://zbmath.org/authors/?q=ai:arakelian.sergei-m"Chestnov, Igor Yu."https://zbmath.org/authors/?q=ai:chestnov.igor-yu"Istratov, Alexander V."https://zbmath.org/authors/?q=ai:istratov.alexander-v"Khudaiberganov, Timur A."https://zbmath.org/authors/?q=ai:khudaiberganov.timur-a"Butkovskiy, Oleg Ya."https://zbmath.org/authors/?q=ai:butkovskii.oleg-yaroslavovichSummary: We studied laser-induced nanocluster structures of different types in both topology and the element compositions due to the nonlinear interaction of laser radiation with the condensed matter taking into account the correlations in nanoparticle ensemble by quantum states. The problem of both optical response and high temperature superconductivity, due to topological surface structures with correlated states, is under our consideration in the frame of nonlinear dynamic modeling resulting, e.g., in the electronic Cooper pairs appearance. Random temporal and spatial variations in selected topological parameters may result in large variations of such functional properties. The analogy with nonlinear dynamics of system under external noise takes place in the case. Quantum mobility of electrons over different trajectories in the spatially inhomogeneous structures/nanocluster systems is presented in accordance with the path integral-theory approach.
For the entire collection see [Zbl 1470.74004].Lectures on quantum mechanics. With problems, exercises and their solutionshttps://zbmath.org/1496.810012022-11-17T18:59:28.764376Z"Basdevant, Jean-Louis"https://zbmath.org/authors/?q=ai:basdevant.jean-louisPublisher's description: The new edition of this remarkable text offers the reader a conceptually strong introduction to quantum mechanics, but goes beyond this to present a fascinating tour of modern theoretical physics. Beautifully illustrated and engagingly written, it starts with a brief overview of diverse topics across physics including nanotechnology, statistical physics, materials science, astrophysics, and cosmology.
The core of the book covers both established and emerging aspects of quantum mechanics. A concise introduction to traditional quantum mechanics covers the Schrödinger equation, Hilbert space, the algebra of observables, hydrogen atom, spin and Pauli principle. Modern features of the field are presented by exploring entangled states, Bell's inequality, quantum cryptography, quantum teleportation and quantum mechanics in the universe. This new edition has been enchanced through the addition of numerous problems with detailed solutions, an introduction to the mathematical tools needed and expanded discussion of the state-of-the-art in applications of quantum mechanics.
See the review of the first edition in [Zbl 1115.81001].A palette of particleshttps://zbmath.org/1496.810022022-11-17T18:59:28.764376Z"Bernstein, Jeremy"https://zbmath.org/authors/?q=ai:bernstein.jeremy.1Publisher's description: From molecules to stars, much of the cosmic canvas can be painted in brushstrokes of primary color: the protons, neutrons, and electrons we know so well. But for meticulous detail, we have to dip into exotic hues-leptons, mesons, hadrons, quarks. Bringing particle physics to life as few authors can, Jeremy Bernstein here unveils nature in all its subatomic splendor.
In this graceful account, Bernstein guides us through high-energy physics from the early twentieth century to the present, including such highlights as the newly discovered Higgs boson. Beginning with Ernest Rutherford's 1911 explanation of the nucleus, a model of atomic structure emerged that sufficed until the 1930s, when new particles began to be theorized and experimentally confirmed. In the postwar period, the subatomic world exploded in a blaze of unexpected findings leading to the theory of the quark, in all its strange and charmed variations. An eyewitness to developments at Harvard University and the Institute for Advanced Study in Princeton, Bernstein laces his story with piquant anecdotes of such luminaries as Wolfgang Pauli, Murray Gell-Mann, and Sheldon Glashow.
Surveying the dizzying landscape of contemporary physics, Bernstein remains optimistic about our ability to comprehend the secrets of the cosmos -- even as its mysteries deepen. We now know that over eighty percent of the universe consists of matter we have never identified or detected. A Palette of Particles draws readers into the excitement of a field where the more we discover, the less we seem to know.The principles of quantum theory, from Planck's quanta to the Higgs boson. The nature of quantum reality and the spirit of Copenhagenhttps://zbmath.org/1496.810092022-11-17T18:59:28.764376Z"Plotnitsky, Arkady"https://zbmath.org/authors/?q=ai:plotnitsky.arkadyPublisher's description: The book considers foundational thinking in quantum theory, focusing on the role the fundamental principles and principle thinking there, including thinking that leads to the invention of new principles, which is, the book contends, one of the ultimate achievements of theoretical thinking in physics and beyond. The focus on principles, prominent during the rise and in the immediate aftermath of quantum theory, has been uncommon in more recent discussions and debates concerning it. The book argues, however, that exploring the fundamental principles and principle thinking is exceptionally helpful in addressing the key issues at stake in quantum foundations and the seemingly interminable debates concerning them. Principle thinking led to major breakthroughs throughout the history of quantum theory, beginning with the old quantum theory and quantum mechanics, the first definitive quantum theory, which it remains within its proper (nonrelativistic) scope. It has, the book also argues, been equally important in quantum field theory, which has been the frontier of quantum theory for quite a while now, and more recently, in quantum information theory, where principle thinking was given new prominence. The approach allows the book to develop a new understanding of both the history and philosophy of quantum theory, from Planck's quantum to the Higgs boson, and beyond, and of the thinking the key founding figures, such as Einstein, Bohr, Heisenberg, Schrödinger, and Dirac, as well as some among more recent theorists. The book also extensively considers the nature of quantum probability, and contains a new interpretation of quantum mechanics, ``the statistical Copenhagen interpretation''. Overall, the book's argument is guided by what Heisenberg called ``the spirit of Copenhagen'', which is defined by three great divorces from the preceding foundational thinking in physics -- reality from realism, probability from causality, and locality from relativity -- and defined the fundamental principles of quantum theory accordingly.Time in powers of ten. Natural phenomena and their timescales. Translated from the Dutch by Saskia Eisberg-'t Hooft. With a foreword by Steven Weinberghttps://zbmath.org/1496.810122022-11-17T18:59:28.764376Z"'t Hooft, Gerard"https://zbmath.org/authors/?q=ai:t-hooft.gerard"Vandoren, Stefan"https://zbmath.org/authors/?q=ai:vandoren.stefanPublisher's description: In this richly illustrated book, Nobel Laureate Gerard 't Hooft and theoretical physicist Stefan Vandoren describe the enormous diversity of natural phenomena that take place at different time scales.
In the tradition of the bestseller Powers of Ten, the authors zoom in and out in time, each step with a factor of ten. Starting from one second, time scales are enlarged until processes are reached that take much longer than the age of the universe. After the largest possible eternities, the reader is treated to the shortest and fastest phenomena known. Then the authors increase with powers of ten, until again the second is reached at the end of the book.
At each time scale, interesting natural phenomena occur, spread over all scientific disciplines: orbital and rotation periods of planets and stars, decay times of elementary particles and atoms, biological rhythms and evolution processes, but also the different geological time scales.Photons. The history and mental models of light quanta. Translated from the German by Ann M. Hentschelhttps://zbmath.org/1496.810182022-11-17T18:59:28.764376Z"Hentschel, Klaus"https://zbmath.org/authors/?q=ai:hentschel.klausPublisher's description: This book focuses on the gradual formation of the concept of `light quanta' or `photons', as they have usually been called in English since 1926. The great number of synonyms that have been used by physicists to denote this concept indicates that there are many different mental models of what `light quanta' are: simply finite, `quantized packages of energy' or `bullets of light'? `Atoms of light' or `molecules of light'? `Light corpuscles' or `quantized waves'? Singularities of the field or spatially extended structures able to interfere? `Photons' in G.N. Lewis's sense, or as defined by QED, i.e. virtual exchange particles transmitting the electromagnetic force?
The term `light quantum' made its first appearance in Albert Einstein's 1905 paper on a ``heuristic point of view'' to cope with the photoelectric effect and other forms of interaction of light and matter, but the mental model associated with it has a rich history both before and after 1905. Some of its semantic layers go as far back as Newton and Kepler, some are only fully expressed several decades later, while others initially increased in importance then diminished and finally vanished. In conjunction with these various terms, several mental models of light quanta were developed -- six of them are explored more closely in this book. It discusses two historiographic approaches to the problem of concept formation: (a) the author's own model of conceptual development as a series of semantic accretions and (b) Mark Turner's model of `conceptual blending'. Both of these models are shown to be useful and should be explored further.
This is the first historiographically sophisticated history of the fully fledged concept and all of its twelve semantic layers. It systematically combines the history of science with the history of terms and a philosophically inspired history of ideas in conjunction with insights from cognitive science.Relativistic many-body theory. A new field-theoretical approachhttps://zbmath.org/1496.810192022-11-17T18:59:28.764376Z"Lindgren, Ingvar"https://zbmath.org/authors/?q=ai:lindgren.ingvarPublisher's description: This revised second edition of the author's classic text offers readers a comprehensively updated review of relativistic atomic many-body theory, covering the many developments in the field since the publication of the original title. In particular, a new final section extends the scope to cover the evaluation of QED effects for dynamical processes.
The treatment of the book is based upon quantum-field theory, and demonstrates that when the procedure is carried to all orders of perturbation theory, two-particle systems are fully compatible with the relativistically covariant Bethe-Salpeter equation. This procedure can be applied to arbitrary open-shell systems, in analogy with the standard many-body theory, and it is also applicable to systems with more than two particles. Presently existing theoretical procedures for treating atomic systems are, in several cases, insufficient to explain the accurate experimental data recently obtained, particularly for highly charged ions.
The main text is divided into three parts. In Part I, the standard time-independent and time-dependent perturbation procedures are reviewed. This includes a new section at the end of chapter 2 concerning the so-called ``Fock-space procedure'' or ``Coulomb-only procedure'' for relativistic-QED calculations.
This is a procedure on an intermediate level, frequently used in recent time by chemists on molecular systems, where a full QED treatment is out of question. Part II describes three methods for QED calculations, a) the standard S-matrix formulation, b) the Two-times Green's-function method, developed by the St Petersburg Atomic Theory group, and c) the Covariant-evolution operator (CEO) method, recently developed by the Gothenburg Atomic Theory group. In Part III, the CEO method is combined with electron correlation to arbitrary order to a unified MBPT-QED procedure. The new Part IV includes two new chapters dealing with dynamical properties and how QED effects can be evaluated for such processes. This part is much needed as there has been an increasing interest in the study of QED effects for such processes.
All methods treated in the book are illustrated with numerical examples, making it a text suitable for advanced students new to the field and a useful reference for established researchers.
See the review of the first edition in [Zbl 1218.81003].The age of innocence. Nuclear physics between the First and Second World Warshttps://zbmath.org/1496.810212022-11-17T18:59:28.764376Z"Stuewer, Roger H."https://zbmath.org/authors/?q=ai:stuewer.roger-hPublisher's description: The two decades between the first and second world wars saw the emergence of nuclear physics as the dominant field of experimental and theoretical physics, owing to the work of an international cast of gifted physicists. Prominent among them were Ernest Rutherford, George Gamow, the husband and wife team of Frédéric and Irène Joliot-Curie, John Cockcroft and Ernest Walton, Gregory Breit and Eugene Wigner, Lise Meitner and Otto Robert Frisch, the brash Ernest Lawrence, the prodigious Enrico Fermi, and the incomparable Niels Bohr.
Their experimental and theoretical work arose from a quest to understand nuclear phenomena; it was not motivated by a desire to find a practical application for nuclear energy. In this sense, these physicists lived in an `Age of Innocence'. They did not, however, live in isolation. Their research reflected their idiosyncratic personalities; it was shaped by the physical and intellectual environments of the countries and institutions in which they worked. It was also buffeted by the political upheavals after the Great War: the punitive postwar treaties, the runaway inflation in Germany and Austria, the Great Depression, and the intellectual migration from Germany and later from Austria and Italy.
Their pioneering experimental and theoretical achievements in the interwar period therefore are set within their personal, institutional, and political contexts. Both domains and their mutual influences are conveyed by quotations from autobiographies, biographies, recollections, interviews, correspondence, and other writings of physicists and historians.Understanding the origin of matter. Perspectives in quantum chromodynamicshttps://zbmath.org/1496.810222022-11-17T18:59:28.764376ZPublisher's description: This book aims at providing a solid basis for the education of the next generation of researchers in hot, dense QCD (Quantum ChromoDynamics) matter. This is a rapidly growing field at the interface of the smallest, i.e. subnuclear physics, and the largest scales, namely astrophysics and cosmology. The extensive lectures presented here are based on the material used at the training school of the European COST action THOR (Theory of hot matter in relativistic heavy-ion collisions).
The book is divided in three parts covering ultrarelativistic heavy-ion collisions, several aspects related to QCD, and simulations of QCD and heavy-ion collisions. The scientific tools and methods discussed provide graduate students with the necessary skills to understand the structure of matter under extreme conditions of high densities, temperatures, and strong fields in the collapse of massive stars or a few microseconds after the big bang. In addition to the theory, the set of lectures presents hands-on material that includes an introduction to simulation programs for heavy-ion collisions, equations of state, and transport properties.
The articles of this volume will not be indexed individually.Numerical calculations on multi-photon processes in alkali metal vaporshttps://zbmath.org/1496.810232022-11-17T18:59:28.764376Z"Merlemis, Nikolaos"https://zbmath.org/authors/?q=ai:merlemis.nikolaos"Lyras, Andreas"https://zbmath.org/authors/?q=ai:lyras.andreas"Papademetriou, Georgios"https://zbmath.org/authors/?q=ai:papademetriou.georgios"Pentaris, Dionysios"https://zbmath.org/authors/?q=ai:pentaris.dionysios"Efthimiopoulos, Thomas"https://zbmath.org/authors/?q=ai:efthimiopoulos.thomasSummary: We present the theoretical framework and the approximations needed to numerically simulate the response of alkali metal atoms under multi-photon excitation. By applying the semi-classical approximation, we obtain a system of coupled ordinary and partial differential equations accounting both for the nonlinear dynamics of the atomic medium and the spatiotemporal evolution of the emitted fields. The case of two-photon excitation by a laser field with an additional one-photon coupling field is investigated by numerically solving the set of differential equations employing a self-consistent computational scheme. The computation of the emission intensities and atomic level populations and coherences is then possible.
For the entire collection see [Zbl 1485.65002].Transfer of orbital angular momentum states of light in \(\Lambda\)-type quantum systemhttps://zbmath.org/1496.810302022-11-17T18:59:28.764376Z"Ye, Fuqiu"https://zbmath.org/authors/?q=ai:ye.fuqiuSummary: We observe the quantum interference impact resulted from incoherent pumping fields on orbital angular momentum (OAM) switch among optical fields in three-level quantum systems. We recall a \(\Lambda\)-kind three level quantum system in which the system is to start with prepared in top excited state. We discover that for suitable parameters of incoherent pumping rates and quantum interference term, the exchange of the optical vortices is possible. We understand that the exchange performance is excessive sufficient whilst we take into account the intense incoherent pumping fields and quantum interference term, respectively. Also, we observe the spatial established of the absorption of the signal light for identifying the OAM number of the vortex probe light. We understand that the absorption of the non-vortex signal light relies upon to the azimuthal phase of the probe vortex light because of presence of quantum interference from incoherent fields.Quantum state interferography with heralded single photonshttps://zbmath.org/1496.810322022-11-17T18:59:28.764376Z"Dhilipan, P."https://zbmath.org/authors/?q=ai:dhilipan.p"Raghavan, G."https://zbmath.org/authors/?q=ai:raghavan.gopalakrishnaSummary: Quantum state tomography is the standard method used for quantum state reconstruction. Recently, a new technique called, quantum state interferography, has been introduced for the direct single-shot measurement of the quantum state of a qubit [\textit{S. N. Sahoo} et al., ``Quantum state interferography'', Phys. Rev. Lett. 125, No. 12, Article ID 123601, 7 p. (2020; \url{doi:10.1103/PhysRevLett.125.123601})]. In the present work, we report a first-of-its-kind experimental demonstration of quantum state interferography of legitimate single photon polarization states derived from spontaneous parametric down conversion source. Further, we provide a more general and a simpler mathematical treatment of the QSI technique. While the theoretical treatment with d-dimensional state vectors in the earlier work is limited only to pure qudits, our approach readily lends itself to the case of mixed qudit systems. The basic arguments and the results of this extension are presented with a qutrit state as an example.Weak measurement effects on dynamics of quantum correlations in a two-atom system in thermal reservoirshttps://zbmath.org/1496.810342022-11-17T18:59:28.764376Z"Ananth, N."https://zbmath.org/authors/?q=ai:ananth.nandini"Muthuganesan, R."https://zbmath.org/authors/?q=ai:muthuganesan.r"Chandrasekar, V. K."https://zbmath.org/authors/?q=ai:chandrasekar.v-kSummary: The dynamical behaviour of quantum correlations captured by different forms of Measurement-Induced Nonlocality (MIN) between two atoms coupled with thermal reservoirs is investigated and compared with the entanglement. It is shown that the MIN quantities are more robust, while noise causes sudden death in entanglement. Further, we quantified the quantum correlation with weak measurement and the effect of measurement strength is observed. The role of mean photon number and weak measurements on quantum correlation is also highlighted.Quantum entanglement of Bosonic Josephson junctions in weak population limithttps://zbmath.org/1496.810352022-11-17T18:59:28.764376Z"Li, Song-Song"https://zbmath.org/authors/?q=ai:li.songsongSummary: We investigate the entanglement behavior of two boson ensembles in weak population limit. We first obtain the analytical expressions of the wave function and the entanglement parameter. By numerically calculate entanglement parameter, we see that the better entanglement can be achieved by enhancing the nonlinearity, the coherent coupling and decreasing the interspecies interaction.Bound state solutions and thermodynamic properties of modified exponential screened plus Yukawa potentialhttps://zbmath.org/1496.810482022-11-17T18:59:28.764376Z"Antia, Akaninyene D."https://zbmath.org/authors/?q=ai:antia.akaninyene-d"Okon, Ituen B."https://zbmath.org/authors/?q=ai:okon.ituen-b"Isonguyo, Cecilia N."https://zbmath.org/authors/?q=ai:isonguyo.cecilia-n"Akankpo, Akaninyene O."https://zbmath.org/authors/?q=ai:akankpo.akaninyene-o"Eyo, Nsemeke E."https://zbmath.org/authors/?q=ai:eyo.nsemeke-eSummary: In this research paper, the approximate bound state solutions and thermodynamic properties of Schrödinger equation with modified exponential screened plus Yukawa potential (MESPYP) were obtained with the help Greene-Aldrich approximation to evaluate the centrifugal term. The Nikiforov-Uvarov (NU) method was used to obtain the analytical solutions. The numerical bound state solutions of five selected diatomic molecules, namely mercury hydride (HgH), zinc hydride (ZnH), cadmium hydride (CdH), hydrogen bromide (HBr) and hydrogen fluoride (HF) molecules were also obtained. We obtained the energy eigenvalues for these molecules using the resulting energy eigenequation and total unnormalized wave function expressed in terms of associated Jacobi polynomial. The resulting energy eigenequation was presented in a closed form and applied to study partition function (Z) and other thermodynamic properties of the system such as vibrational mean energy (U), vibrational specific heat capacity (C), vibrational entropy (S) and vibrational free energy (F). The numerical bound state solutions were obtained from the resulting energy eigenequation for some orbital angular quantum number. The results obtained from the thermodynamic properties are in excellent agreement with the existing literature. All numerical computations were carried out using spectroscopic constants of the selected diatomic molecules with the help of MATLAB 10.0 version. The numerical bound state solutions obtained increases with an increase in quantum state.Time reversal symmetry for classical, non-relativistic quantum and spin systems in presence of magnetic fieldshttps://zbmath.org/1496.810492022-11-17T18:59:28.764376Z"Carbone, Davide"https://zbmath.org/authors/?q=ai:carbone.davide"De Gregorio, Paolo"https://zbmath.org/authors/?q=ai:de-gregorio.paolo"Rondoni, Lamberto"https://zbmath.org/authors/?q=ai:rondoni.lambertoSummary: We extend to quantum mechanical systems results previously obtained for classical mechanical systems, concerning time reversibility in presence of a magnetic field. As in the classical case, results like the Onsager reciprocal relations and the so-called fluctuation theorems, are consequently obtained, without recourse to the Casimir modification. The quantum systems treated here are non-relativistic, and are described by the Schrödinger equation or the Pauli equation. In particular, we prove that the spin-field interaction does not break the time reversal invariance (TRI) of the dynamics, and that it does not require additional conditions for such a symmetry to hold, compared to the spinless cases. These results are relevant for experiments such as diffusion in solutions, thermoelectricity and spin charge transport. Indeed, no violation of the Onsager relations has been found in presence of a magnetic field, contrary to general expectations.Evolution of energy and magnetic moment of a quantum charged particle in power-decaying magnetic fieldshttps://zbmath.org/1496.810522022-11-17T18:59:28.764376Z"Dodonov, V. V."https://zbmath.org/authors/?q=ai:dodonov.victor-v"Horovits, M. B."https://zbmath.org/authors/?q=ai:horovits.m-bSummary: We consider a quantum spinless nonrelativistic charged particle moving in the \(xy\) plane under the action of a homogeneous time-dependent magnetic field \(B(t) = B_0(1 + t/t_0)^{-1-g}\), directed along the \(z\)-axis and described by means of the vector potential \(\mathbf{A}(t) = B(t)[-y, x]/2\). Assuming that the particle was initially in the thermal equilibrium state with a negligible coupling to a reservoir, we obtain exact formulas for the time-dependent mean values of the energy and magnetic moment in terms of the Bessel functions. Different regimes of the evolution are discovered and illustrated in several figures. The energy goes asymptotically to a finite value if \(g > 0\) (``fast'' decay), while it goes asymptotically to zero if \(g \leq 0\) (``slow'' decay). The dependence on parameter \(t_0\) practically disappears when \(1 + g\) is close to zero value (``superslow'' decay). The mean magnetic moment goes to zero for \(g > 1\), while it grows unlimitedly if \(g < 1\).Photovoltaic efficiency at maximum power of a quantum dot moleculehttps://zbmath.org/1496.810622022-11-17T18:59:28.764376Z"Lira, J."https://zbmath.org/authors/?q=ai:lira.jaroslaw|lira.jorge-h-s"Sanz, L."https://zbmath.org/authors/?q=ai:sanz.l-m|sanz.luis|sanz.leon"Alcalde, A. M."https://zbmath.org/authors/?q=ai:alcalde.a-mSummary: In this work, the behavior of the efficiency at the maximum power of a quantum dot molecule, acting as a device for photovoltaic conversion, is investigated. A theoretical approach using a master equation, considering the effect of the energy offsets, and the width of the quantum barrier, identify realistic physical conditions that enhance the photovoltaic response of the photocell. By mapping the effect of the control of the energy offsets of the nanostructure, a condition for gain in 30\% of maximum power delivered per molecule if compared with a single quantum dot is demonstrated. Studying the behavior as a function of temperature, the physical system exhibits gain when compared to the Chambadal-Novikov-Curzon-Ahlborn efficiency at maximum power, without exceeding Carnot's efficiency, as expected from the second law of thermodynamics.The properties of the polaron in III-V compound semiconductor quantum dots induced by the influence of Rashba spin-orbit interactionhttps://zbmath.org/1496.810642022-11-17T18:59:28.764376Z"Zhang, Wei"https://zbmath.org/authors/?q=ai:zhang.wei.61"Han, Shuang"https://zbmath.org/authors/?q=ai:han.shuang"Ma, Xin-Jun"https://zbmath.org/authors/?q=ai:ma.xinjun"Xianglian"https://zbmath.org/authors/?q=ai:xianglian."Sun, Yong"https://zbmath.org/authors/?q=ai:sun.yong"Xiao, Jing-Lin"https://zbmath.org/authors/?q=ai:xiao.jinglinSummary: We study the ground state energy (GSE) of weak coupling polaron confined in quantum dots (QD) of III-V compound semiconductors using the linear combinatorial operator (LCO) and the Lee-Low-Pines unitary transformation (LLPUT) method. Our calculated results show that the GSE of the polaron splits into two branches due to the Rashba spin-orbit (SO) coupling effect, and spin splitting spacing is influenced by Rashba SO coupling strength and the coupling strength and the effective mass of III-V compound semiconductor material. That reveals the SO coupling properties of weak coupling polaron in the QD of III-V compound semiconductors, which provides a theoretical platform for the fabrication of nanometer devices.Optical effects of domain wallshttps://zbmath.org/1496.810682022-11-17T18:59:28.764376Z"Khoze, Valentin V."https://zbmath.org/authors/?q=ai:khoze.valentin-v"Milne, Daniel L."https://zbmath.org/authors/?q=ai:milne.daniel-lSummary: Domain walls arise in theories where there is spontaneous symmetry breaking of a discrete symmetry such as \(\mathbb{Z}_N\) and are a feature of many BSM models. In this work we consider the possibility of detecting domain walls through their optical effects and specify three different methods of coupling domain walls to the photon. We consider the effects of these couplings in the context of gravitational wave detectors, such as LIGO, and examine the sensitivity of these experiments to domain wall effects. In cases where gravitational wave detectors are not sensitive we examine our results in the context of axion experiments and show how effects of passing domain walls can be detected at interferometers searching for an axion signal.Energy shift of a uniformly moving two-level atom through a thermal reservoirhttps://zbmath.org/1496.810722022-11-17T18:59:28.764376Z"Cai, Huabing"https://zbmath.org/authors/?q=ai:cai.huabing"Wang, Li-Gang"https://zbmath.org/authors/?q=ai:wang.ligangSummary: We investigate the implications of an atomic constant velocity in the energy shift of a two-level atom inside the thermal bath of a quantum scalar field, which is described by the Bose-Einstein distribution. The use of DDC formalism shows that the contribution of thermal fluctuations on the atomic level shifts depends on the atomic velocity and the temperature of the heat reservoir but the contribution of radiation reaction is totally insusceptible. The resulting energy shifts are analyzed and examined in detail under different circumstances. The atomic uniform linear motion always broadens the atomic level spacing in the limit of low temperature but narrows down it in the limit of high temperature. Our work clearly indicates that the moving heat reservoir shifts the atomic levels in a way quite different from that of the static one.Basic properties of a mean field laser equationhttps://zbmath.org/1496.810732022-11-17T18:59:28.764376Z"Fagnola, Franco"https://zbmath.org/authors/?q=ai:fagnola.franco"Mora, Carlos M."https://zbmath.org/authors/?q=ai:mora.carlos-mGauge-Higgs models from nilmanifoldshttps://zbmath.org/1496.810782022-11-17T18:59:28.764376Z"Deandrea, Aldo"https://zbmath.org/authors/?q=ai:deandrea.aldo"Dogliotti, Fabio"https://zbmath.org/authors/?q=ai:dogliotti.fabio"Tsimpis, Dimitrios"https://zbmath.org/authors/?q=ai:tsimpis.dimitriosSummary: We consider the compactification of a Yang-Mills theory on a three-dimensional nilmanifold. The compactification generates a Yang-Mills theory in four space-time dimensions, coupled to a specific scalar sector. The compactification geometry gives rise to masses for the zero-modes, proportional to the twist parameter of the nilmanifold. We study the simple example of an \(SU(3)\) model broken by a non-trivial vacuum of the scalar potential which generates three mass scales, two being at tree level, and the third one at loop level. We point out the relevance of general twisted geometries for model building and in particular for gauge-Higgs type models, as the twist generates tree-level mass hierarchies useful for grand unification and for the Higgs sector in electroweak symmetry breaking.Erratum to: ``Superstring backgrounds in string geometry''https://zbmath.org/1496.810812022-11-17T18:59:28.764376Z"Honda, Masaki"https://zbmath.org/authors/?q=ai:honda.masaki"Sato, Matsuo"https://zbmath.org/authors/?q=ai:sato.matsuo"Tohshima, Taiki"https://zbmath.org/authors/?q=ai:tohshima.taikiFrom the text: In [\textit{M. Honda} et al., Adv. High Energy Phys. 2021, Article ID 9993903, 7 p. (2021; Zbl 1473.81137)], a minor discrepancy between the PDF and HTML versions of the article was identified. This was caused by an error during the conversion of the LaTex file during the production of the article and the PDF version has therefore been updated to correct these errors.Transport properties of a 3-dimensional holographic effective theory with gauge-axion couplinghttps://zbmath.org/1496.810872022-11-17T18:59:28.764376Z"Li, Yi-Lin"https://zbmath.org/authors/?q=ai:li.yilin"Wang, Xi-Jing"https://zbmath.org/authors/?q=ai:wang.xi-jing"Fu, Guoyang"https://zbmath.org/authors/?q=ai:fu.guoyang"Wu, Jian-Pin"https://zbmath.org/authors/?q=ai:wu.jian-pinSummary: In this paper, we implement a 3-dimensional holographic effective theory with gauge-axion coupling. The analytical black hole solution is worked out. We investigate the Direct current (DC) thermoelectric conductivities. A novel property is that DC electric conductivity for vanishing gauge-axion coupling is temperature dependent. It is different from that of 4-dimensional axion model whose DC electric conductivity is temperature independent. In addition, the gauge-axion coupling induces a metal insulator transition (MIT) at zero temperature. The properties of other DC thermoelectric conductivities are also discussed. Moreover we find that the Wiedemann-Franz (WF) law is violated in our model.Effective electromagnetic actions for Lorentz violating theories exhibiting the axial anomalyhttps://zbmath.org/1496.810892022-11-17T18:59:28.764376Z"Gómez, Andrés"https://zbmath.org/authors/?q=ai:gomez.andres"Martín-Ruiz, A."https://zbmath.org/authors/?q=ai:martin-ruiz.alberto"Urrutia, Luis F."https://zbmath.org/authors/?q=ai:urrutia.luis-fSummary: The CPT odd contribution to the effective electromagnetic action deriving from the vacuum polarization tensor in a large class of fermionic systems exhibiting Lorentz invariance violation (LIV) is calculated using thermal field theory methods, focusing upon corrections depending on the chemical potential. The systems considered exhibit the axial anomaly and their effective actions are described by axion electrodynamics whereby all the LIV parameters enter in the coupling \(\operatorname{\Theta}(x)\) to the unmodified Pontryagin density. A preliminary application to type-I tilted Weyl semimetals is briefly presented.On the off-shell superfield Lagrangian formulation of \(4D\), \(\mathcal{N} = 1\) supersymmetric infinite spin theoryhttps://zbmath.org/1496.810902022-11-17T18:59:28.764376Z"Buchbinder, I. L."https://zbmath.org/authors/?q=ai:buchbinder.ioseph-l"Fedoruk, S. A."https://zbmath.org/authors/?q=ai:fedoruk.s-a"Isaev, A. P."https://zbmath.org/authors/?q=ai:isaev.aleksei-petrovich"Krykhtin, V. A."https://zbmath.org/authors/?q=ai:krykhtin.v-aSummary: We develop a complete off-shell Lagrangian description of the free \(4D\), \(\mathcal{N} = 1\) supersymmetric theory of infinite spin. Bosonic and fermionic fields are formulated in terms of spin-tensor fields with dotted and undotted indices. The corresponding Lagrangians for bosonic and fermionic infinite spin fields entering into the on-shell supersymmetric model are derived within the BRST method. Lagrangian for this supersymmetric model is written in terms of the complex infinite spin bosonic field and infinite spin fermionic Weyl field subject to supersymmetry transformations. The fields involved into the on-shell supersymmetric Lagrangian can be considered as components of six infinite spin chiral and antichiral multiplets. These multiplets are extended to the corresponding infinite spin chiral and antichiral superfields so that two chiral and antichiral superfields contain among the components the basic fields of an infinite spin supermultiplet and extra four chiral and antichiral superfields containing only the auxiliary fields needed for the Lagrangian formulation. The superfield Lagrangian is constructed in terms of these six chiral and antichiral supefields, and we show that the component form of this superfield Lagrangian exactly coincides with the previously found component supersymmetric Lagrangian after eliminating the component fields added to construct (anti)chiral superfields.The factorization method for inverse scattering by a two-layered cavity with conductive boundary conditionhttps://zbmath.org/1496.810922022-11-17T18:59:28.764376Z"Ye, Jianguo"https://zbmath.org/authors/?q=ai:ye.jianguo"Yan, Guozheng"https://zbmath.org/authors/?q=ai:yan.guozhengSummary: In this paper we consider the inverse scattering problem of determining the shape of a two-layered cavity with conductive boundary condition from sources and measurements placed on a curve inside the cavity. First, we show the well-posedness of the direct scattering problem by using the boundary integral equation method. Then, we prove that the factorization method can be applied to reconstruct the interface of the two-layered cavity from near-field data. Some numerical experiments are also presented to demonstrate the feasibility and effectiveness of the factorization method.Parton distributions of light quarks and antiquarks in the protonhttps://zbmath.org/1496.810932022-11-17T18:59:28.764376Z"Chang, Lei"https://zbmath.org/authors/?q=ai:chang.lei"Gao, Fei"https://zbmath.org/authors/?q=ai:gao.fei.1|gao.fei"Roberts, Craig D."https://zbmath.org/authors/?q=ai:roberts.craig-dSummary: An algebraic \textit{Ansatz} for the proton's Poincaré-covariant wave function, which includes both scalar and pseudovector diquark correlations, is used to calculate proton valence, sea, and glue distribution functions (DFs). Regarding contemporary data, a material pseudovector diquark component in the proton is necessary for an explanation of the neutron-proton structure function ratio; and a modest Pauli blocking effect in the gluon splitting function is sufficient to explain the proton's light-quark antimatter asymmetry. In comparison with pion DFs, the light-front momentum fractions carried by all identifiable parton classes are the same; on the other hand, the higher moments are different. Understanding these features may provide insights that explain distinctions between Nambu-Goldstone bosons and seemingly less complex hadrons.Four-dimensional factorization of the fermion determinant in lattice QCDhttps://zbmath.org/1496.810942022-11-17T18:59:28.764376Z"Giusti, Leonardo"https://zbmath.org/authors/?q=ai:giusti.leonardo"Saccardi, Matteo"https://zbmath.org/authors/?q=ai:saccardi.matteoSummary: In the last few years it has been proposed a one-dimensional factorization of the fermion determinant in lattice QCD with Wilson-type fermions that leads to a block-local action of the auxiliary bosonic fields. Here we propose a four-dimensional generalization of this factorization. Possible applications are more efficient parallelizations of Monte Carlo algorithms and codes, master field simulations, and multi-level integration.The asymptotic approach to the continuum of lattice QCD spectral observableshttps://zbmath.org/1496.810952022-11-17T18:59:28.764376Z"Husung, Nikolai"https://zbmath.org/authors/?q=ai:husung.nikolai"Marquard, Peter"https://zbmath.org/authors/?q=ai:marquard.peter"Sommer, Rainer"https://zbmath.org/authors/?q=ai:sommer.rainerSummary: We consider spectral quantities in lattice QCD and determine the asymptotic behaviour of their discretization errors. Wilson fermion with \(\mathrm{O}(a)\)-improvement, (Möbius) Domain wall fermion (DWF), and overlap Dirac operators are considered in combination with the commonly used gauge actions. Wilson fermions and DWF with domain wall height \(M_5 = 1 + \mathrm{O}(g_0^2)\) have the same, approximate, form of the asymptotic cutoff effects: \(Ka^2 [\bar{g}^2(a^{-1})]^{0.760}\). A domain wall height \(M_5 = 1.8\), as often used, introduces large mass-dependent \(K^\prime(m) a^2 [\bar{g}^2(a^{-1})]^{0.518}\) effects. Massless twisted mass fermions have the same form as Wilson fermions when the Sheikholeslami-Wohlert term [\textit{B. Sheikholeslami} and \textit{R. Wohlert}, ``Improved continuum limit lattice action for QCD with Wilson fermions'', Nucl. Phys., B 259, No. 4, 572--596 (1985; \url{doi:10.1016/0550-3213(85)90002-1})] is included. For their mass-dependent cutoff effects we have information on the exponents \(\hat{\Gamma}_i\) of \(\bar{g}^2(a^{-1})\) but not for the pre-factors. For staggered fermions there is only partial information on the exponents.
We propose that tree-level \(\mathrm{O}(a^2)\) improvement, which is easy to do [\textit{M. Alford}, \textit{T. R. Klassen} and \textit{G. P. Lepage}, ``Improving lattice quark actions'', Nucl. Phys., B 496, No. 1--2, 377--407 (1997; \url{doi:10.1016/S0550-3213(97)00249-6})], should be used in the future -- both for the fermion and the gauge action. It improves the asymptotic behaviour in all cases.Emergence of non-linear electrodynamic theories from \(T\bar{T}\)-like deformationshttps://zbmath.org/1496.810962022-11-17T18:59:28.764376Z"Babaei-Aghbolagh, H."https://zbmath.org/authors/?q=ai:babaei-aghbolagh.h"Velni, Komeil Babaei"https://zbmath.org/authors/?q=ai:velni.komeil-babaei"Yekta, Davood Mahdavian"https://zbmath.org/authors/?q=ai:yekta.davood-mahdavian"Mohammadzadeh, H."https://zbmath.org/authors/?q=ai:mohammadzadeh.hamid|mohammadzadeh.hosein|mohammadzadeh.hosseinSummary: In this letter, we investigate the deformation of the ModMax theory, as a unique Lagrangian of non-linear electrodynamics preserving both conformal and electromagnetic-duality invariance, under \(T\bar{T}\)-like flows. We will show that the deformed theory is the generalized non-linear Born-Infeld electrodynamics. Being inspired by the invariance under the flow equation for Born-Infeld theories, we propose another \(T\bar{T}\)-like operator generating the ModMax and generalized Born-Infeld non-linear electrodynamic theories from the usual Maxwell and Born-Infeld theories, respectively.Finite electrodynamics from T-dualityhttps://zbmath.org/1496.810972022-11-17T18:59:28.764376Z"Gaete, Patricio"https://zbmath.org/authors/?q=ai:gaete.patricio"Nicolini, Piero"https://zbmath.org/authors/?q=ai:nicolini.pieroSummary: In this paper, we present the repercussions of Padmanabhan's propagator in electrodynamics. This corresponds to implement T-duality effects in a U(1) gauge theory. By formulating a nonlocal action consistent with the above hypothesis, we derive the profile of static potentials between electric charges via a path integral approach. Interestingly, the Coulomb potential results regularized by a length scale proportional to the parameter \((\alpha^\prime)^{1/2}\). Accordingly, fields are vanishing at the origin. We also discuss an array of experimental testbeds to expose the above results. It is interesting to observe that T-duality generates an effect of dimensional fractalization, that resembles similar phenomena in fractional electromagnetism. Finally, our results have also been derived with a gauge-invariant method, as a necessary check of consistency for any non-Maxwellian theory.Sensitivity estimates on the electromagnetic dipole moments of the \(\tau\)-Lepton at future \(e^+e^-\) Linear collidershttps://zbmath.org/1496.810982022-11-17T18:59:28.764376Z"Gutiérrez-Rodríguez, A."https://zbmath.org/authors/?q=ai:gutierrez-rodriguez.a"Pérez-Mayorga, C."https://zbmath.org/authors/?q=ai:perez-mayorga.c"González-Sánchez, A."https://zbmath.org/authors/?q=ai:gonzalez-sanchez.aSummary: We estimate bounds on the prediction for the anomalous magnetic and electric dipole moments of the tau-lepton through the process \(e^+e^-\rightarrow (Z_i)\to\tau^+\tau^-\gamma,Z_i=1,2,3\) within the context of a \(SU(4)_L\times U(1)_X\) electroweak model, framed into the capabilities at the future International Linear Collider (ILC) and the Compact Linear Collider (CLIC). We assume center-of-mass energies and luminosities for the ILC of \(\sqrt{s}=0.250-1\) TeV and \(\mathsf{L}=10-1000fb^{-1}\), while for the CLIC of \(\sqrt{s}=0.380-3\) TeV and \(\mathscr{L}=100-5000 fb^{-1}\). With these energies and luminosities the ILC and CLIC can measure the electromagnetic dipole moments of the \(\tau\)-lepton \(a_\tau\) and \(d_\tau\) with a sensitivity of the order \(\mathcal{O} (10^{-3}-10^{-1})\) and \(\mathcal{O}(10^{-17})(\text{ecm})\) at \(95\%\) C.L..Muon \(g - 2\) anomaly and non-localityhttps://zbmath.org/1496.810992022-11-17T18:59:28.764376Z"Capolupo, A."https://zbmath.org/authors/?q=ai:capolupo.antonio"Lambiase, G."https://zbmath.org/authors/?q=ai:lambiase.gaetano"Quaranta, A."https://zbmath.org/authors/?q=ai:quaranta.antonella|quaranta.anna-graziaSummary: We show that the discrepancy between the observed value of the muon anomalous moment and the standard model prediction can be explained in the framework of nonlocal theories. We compute the leading order and next to leading order nonlocal correction to the anomalous magnetic moment \(\alpha_{NL}\) and we find that it depends on the nonlocality scale \(M_f\) and the fermion mass \(m_f\) as \(\alpha_{NL} \propto \frac{m_f^2}{M_f^2}\). Such a dependence of the anomalous magnetic moment allows to explain, in a flavor-blind nonlocality scale, why the observed anomalous magnetic moment of the electron is much closer to the standard model prediction, and permits to predict a large anomaly that should exist for the \(\tau\) particle. We also determine the lower bounds on the nonlocality scale, for both flavor-blind and flavor-dependent scenarios.Longitudinal structure function \(F_L\) at low \(Q^2\) and low \(x\) with model for higher twist: an updatehttps://zbmath.org/1496.811002022-11-17T18:59:28.764376Z"Badełek, Barbara"https://zbmath.org/authors/?q=ai:badelek.barbara"Staśto, Anna M."https://zbmath.org/authors/?q=ai:stasto.anna-mSummary: A reanalysis of the model for the longitudinal structure function \(F_L(x, Q^2)\) at low \(x\) and low \(Q^2\) was undertaken, in view of the advent of the EIC. The model is based on the photon-gluon fusion mechanism suitably extrapolated to the region of low \(Q^2\). It includes the kinematic constraint \(F_L \sim Q^4\) as \(Q^2 \to 0\) and higher twist contribution which vanishes as \(Q^2 \to \infty \). Revised model was critically updated and compared to the presently available data.An extended 3-3-1 model with radiative linear seesaw mechanismhttps://zbmath.org/1496.811012022-11-17T18:59:28.764376Z"Cárcamo Hernández, A. E."https://zbmath.org/authors/?q=ai:hernandez.a-e-carcamo"Kovalenko, Sergey"https://zbmath.org/authors/?q=ai:kovalenko.sergey"Queiroz, Farinaldo S."https://zbmath.org/authors/?q=ai:queiroz.farinaldo-s"Villamizar, Yoxara S."https://zbmath.org/authors/?q=ai:villamizar.yoxara-sSummary: Motivated by the recent muon anomalous magnetic moment (\(g-2\)) measurement at FERMILAB and non-zero neutrino masses, we propose a model based on the \(SU(3)_C \times SU(3)_L \times U(1)_X\) (3-3-1) gauge symmetry. The most popular 3-3-1 models in the literature require the presence of a scalar sextet to address neutrino masses. In our work, we show that we can successfully implement an one-loop linear seesaw mechanism with right-handed neutrinos, and vector-like fermions to nicely explain the active neutrino masses, and additionally reproduce the recent Muon \(g-2\) result, in agreement with existing bounds.The structure of a nucleushttps://zbmath.org/1496.811022022-11-17T18:59:28.764376Z"Kabulov, V. K."https://zbmath.org/authors/?q=ai:kabulov.vasil-kabulovich(no abstract)New class of solutions in the non-minimal O(3)-sigma modelhttps://zbmath.org/1496.811032022-11-17T18:59:28.764376Z"Lima, F. C. E."https://zbmath.org/authors/?q=ai:lima.f-c-e"Almeida, C. A. S."https://zbmath.org/authors/?q=ai:almeida.carlos-a-sSummary: For the study of topological vortices with non-minimal coupling, we built a kind of non-canonical O(3)-sigma model, with a Maxwell term modified by a dielectric function. Through the BPS formalism an investigation is made on possible configurations of vortices in topological sectors of the sigma model and the real scalar field. For a particular ansatz, the solutions of the topological sector of the real scalar field are described by the known kink solutions. On the other hand, when studying the vortices in non-minimal sector of the pure O(3)-sigma model, it is detected the emergence of solutions that generate solitary waves similar to structures derived from a KdV-like theory. We observed that in the study of mixed models, namely, the topological sector of the O(3)-sigma model coupled to the topological sector of the real scalar field, the vortex solutions assume a profile of a step function. Then, when kinks of the topological sector of the scalar field are interacting with the field of the sigma model, it makes the field solutions of the O(3)-sigma model become extremely localized, making the vortice structures non-physical.Effect of the pion field on the distributions of pressure and shear in the protonhttps://zbmath.org/1496.811042022-11-17T18:59:28.764376Z"Owa, Shiryo"https://zbmath.org/authors/?q=ai:owa.shiryo"Thomas, A. W."https://zbmath.org/authors/?q=ai:thomas.anthony-w"Wang, X. G."https://zbmath.org/authors/?q=ai:wang.xingang|wang.xuegang|wang.xiaoguang.1|wang.xungai|wang.xingguang|wang.xiaogen|wang.xuegeng|wang.xingguo|wang.xiuguo|wang.xiaochun-george|wang.xiaogui|wang.xugang|wang.xinggui|wang.xuguang|wang.xuan-gong|wang.xiaoge|wang.xiaogong|wang.xiaogang|wang.xinge|wang.xin-guang|wang.xinggang|wang.xianggong|wang.xiaoguang|wang.xian-guo|wang.xiaoguo|wang.xingengSummary: In light of recent experimental progress in determining the pressure and shear distributions in the proton, these quantities are calculated in a model with confined quarks supplemented by the pion field required by chiral symmetry. The incorporation of the pion contributions is shown to account for the long-range distributions, in general agreement with the experimentally extracted quark contributions. The results of the model are also compared with lattice QCD results at unphysically large quark mass.A digital quantum simulation of the Agassi modelhttps://zbmath.org/1496.811052022-11-17T18:59:28.764376Z"Pérez-Fernández, Pedro"https://zbmath.org/authors/?q=ai:perez-fernandez.pedro"Arias, José-Miguel"https://zbmath.org/authors/?q=ai:arias.jose-miguel"García-Ramos, José-Enrique"https://zbmath.org/authors/?q=ai:garcia-ramos.jose-enrique"Lamata, Lucas"https://zbmath.org/authors/?q=ai:lamata.lucasSummary: A digital quantum simulation of the Agassi model from nuclear physics is proposed and analyzed. The proposal is worked out for the case with four different sites. Numerical simulations and analytical estimations are presented to illustrate the feasibility of this proposal with current technology. The proposed approach is fully scalable to a larger number of sites. The use of a quantum correlation function as a probe to explore the quantum phases by quantum simulating the time dynamics, with no need of computing the ground state, is also studied. Evidence is given showing that the amplitude of the time dynamics of a correlation function in this quantum simulation is linked to the different quantum phases of the system. This approach establishes an avenue for the digital quantum simulation of useful models in nuclear physics.Radiative (anti)neutrino energy spectra from muon, pion, and kaon decayshttps://zbmath.org/1496.811062022-11-17T18:59:28.764376Z"Tomalak, Oleksandr"https://zbmath.org/authors/?q=ai:tomalak.oleksandrSummary: To describe low-energy (anti)neutrino fluxes in modern coherent elastic neutrino-nucleus scattering experiments as well as high-energy fluxes in precision-frontier projects such as the Enhanced NeUtrino BEams from kaon Tagging (ENUBET) and the Neutrinos from STORed Muons (nuSTORM), we evaluate (anti)neutrino energy spectra from radiative muon (\(\mu^- \to e^- \bar{\nu}_e \nu_\mu(\gamma)\), \(\mu^+ \to e^+ \nu_e \bar{\nu}_\mu(\gamma)\)), pion \(\pi_{\ell2}\) (\(\pi^- \to \mu^- \bar{\nu}_\mu(\gamma)\), \(\pi^+ \to \mu^+ \nu_\mu(\gamma)\)), and kaon \(K_{\ell 2}\) (\(K^- \to \mu^- \bar{\nu}_\mu(\gamma)\), \(K^+ \to \mu^+ \nu_\mu(\gamma)\)) decays. We compare detailed \(\mathrm{O}(\alpha)\) distributions to the well-known tree-level results, investigate electron-mass corrections and provide energy spectra in analytical form. Radiative corrections introduce continuous and divergent spectral components near the endpoint, on top of the monochromatic tree-level meson-decay spectra, which can change the flux-averaged cross section at \(6 \times 10^{-5}\) level for the scattering on \(^{40}\mathrm{Ar}\) nucleus with (anti)neutrinos from the pion decay at rest. Radiative effects modify the expected (anti)neutrino fluxes from the muon decay around the peak region by 3--4 permille, which is a precision goal for next-generation artificial neutrino sources.Freezable bound states in the continuum for time-dependent quantum potentialshttps://zbmath.org/1496.811072022-11-17T18:59:28.764376Z"Gutiérrez-Altamirano, Izamar"https://zbmath.org/authors/?q=ai:gutierrez-altamirano.izamar"Contreras-Astorga, Alonso"https://zbmath.org/authors/?q=ai:contreras-astorga.alonso"Raya, Alfredo"https://zbmath.org/authors/?q=ai:raya.alfredoSummary: In this work, we construct time-dependent potentials for the Schrödinger equation via supersymmetric quantum mechanics. The Schrödinger equations with the generated potentials have a solution with the property that after a particular threshold time \(t_F\), when the potentials do no longer change, the evolving solution becomes a bound state in the continuum, its probability distribution freezes. After the factorization of a geometric phase, the solution satisfies a stationary Schrödinger equation with time-independent potential. The procedure can be extended to support more than one bound state in the continuum. Closed expressions for the potential, the bound states in the continuum, and scattering states are given for the examples starting from the free particle.On the remote entanglement of MW qubits using hybrid Rydberg systemshttps://zbmath.org/1496.811082022-11-17T18:59:28.764376Z"Liu, Yubao"https://zbmath.org/authors/?q=ai:liu.yubao"Li, Lin"https://zbmath.org/authors/?q=ai:li.lin.1|li.lin.2|li.lin"Ma, Yiqiu"https://zbmath.org/authors/?q=ai:ma.yiqiuSummary: Distributed quantum computing is a promising architecture for the realization of scalable quantum computers. The cornerstone of such a quantum architecture is the ability to establish quantum correlations between remote computation modules. Remote entanglement and quantum logic gates have been demonstrated in a few physical systems enabled by coupling matter qubits to photons. However, building such a quantum architecture with superconducting qubits seems very challenging due to the lack of efficient matter-light quantum interface. Following our previous work on hybrid microwave-optical quantum gate, we propose a protocol to perform a remote quantum logic gate between distant superconducting quantum modules. MW qubits in distant modules are connected with photonic ancillary qubits and a hybrid Rydberg-cavity system is employed as the quantum mediator for microwave-optical photon interaction. We perform thorough analysis and find high-fidelity remote quantum logic gate is achievable by integrating state of the art quantum systems.(2+1)-dimensional unstable matter waves in self-interacting Pseudospin-1/2 BECs under combined Rashba and Dresselhaus spin-orbit couplingshttps://zbmath.org/1496.811092022-11-17T18:59:28.764376Z"Tabi, Conrad Bertrand"https://zbmath.org/authors/?q=ai:tabi.conrad-bertrand"Veni, Saravana"https://zbmath.org/authors/?q=ai:veni.saravana"Kofané, Timoléon Crépin"https://zbmath.org/authors/?q=ai:kofane.timoleon-crepinSummary: The modulational instability (MI) of continuous waves is exclusively addressed theoretically and numerically in a two-component Bose-Einstein condensate in the presence of a mixture of Rashba and Dresselhaus (RD) spin-orbit couplings and the Lee-Huang-Yang (LHY) term. The linear stability analysis is utilized to derive an expression for the MI growth rate. It is revealed that instability can be excited in the presence of the RD spin-orbit coupling under conditions where nonlinear and dispersive effects are suitably balanced. Analytical predictions are confirmed via direct numerical simulations, where MI is manifested by the emergence of soliton-molecules that include four-peaked solitons and more exotic vortex structures that are very sensitive to variations in spin-orbit coupling strengths. Our study suggests that MI is a suitable mechanism for generating matter waves through multi-peaked solitons of various geometries.A multistep conditionally P-stable method with phase properties of high order for problems in quantum chemistryhttps://zbmath.org/1496.811102022-11-17T18:59:28.764376Z"Lin, Chia-Liang"https://zbmath.org/authors/?q=ai:lin.chialiang"Simos, T. E."https://zbmath.org/authors/?q=ai:simos.theodore-eSummary: A new two-step method, for the numerical solution of problems in quantum chemistry, is introduced in the present paper. The new algorithm is conditionally P-Stable and an economical scheme. It has vanished phase-lag and it's first to fourth derivatives. We use for the new scheme the symbol \textit{LOWPF}4\textit{DECN}2\textit{ST}. We apply the newly introduced method to problems in Quantum Chemistry. The new scheme is defined as \textbf{economical} since it uses 4 function evaluations per step in order to achieve an algebraic order (\textit{AOR}) of 10.Quantum Hall effect and geometric phase factor in strong magnetic fieldshttps://zbmath.org/1496.811112022-11-17T18:59:28.764376Z"Lv, Xiao-Xi"https://zbmath.org/authors/?q=ai:lv.xiao-xi"Yu, Zhao-Xian"https://zbmath.org/authors/?q=ai:yu.zhaoxian"Liu, Ye-Hou"https://zbmath.org/authors/?q=ai:liu.yehouSummary: The concept of Berry phase factor in adiabatic processes is extended to degenerate systems. The relationship between quantum Hall effect and Berry phase factor is studied under symmetric gauge conditions, and the relationship between quantum Hall conductivity and Berry phase factor is derived, the theoretical analysis is consistent with the experimental results of Klitzing, [\textit{D. C. Tsui}, \textit{H. L. Stormer}, and \textit{A. C. Gossard}, ``Two-dimensional magnetotransport in the extreme quantum limit'', Phys. Rev. Lett. 48, No. 22, 1559--1562 (1982; \url{doi:10.1103/PhysRevLett.48.1559})].Super Hirota bilinear equations for the super modified BKP hierarchyhttps://zbmath.org/1496.811122022-11-17T18:59:28.764376Z"Chen, Huizhan"https://zbmath.org/authors/?q=ai:chen.huizhanSummary: In this paper, the super modified BKP (SmBKP) hierarchy is constructed from the perspective of the neutral free superfermions by using highest weight representations of the infinite-dimensional Lie superalgebra \(\mathfrak{b}_{\infty|\infty}(\mathfrak{g})\). Based upon this, the corresponding super Hirota bilinear identity of the SmBKP hierarchy is obtained by using the super Boson-Fermion correspondence of type B, and some specific examples of super Hirota bilinear equations are given. The super bilinear identity with respect to super wave and adjoint wave functions is also constructed. At last, we also give a class of solutions other than group orbit by the neutral free superfermions.Generalized intensity-dependent multiphoton Jaynes-Cummings modelhttps://zbmath.org/1496.811132022-11-17T18:59:28.764376Z"Bartzis, V."https://zbmath.org/authors/?q=ai:bartzis.v"Merlemis, N."https://zbmath.org/authors/?q=ai:merlemis.nikolaos"Serris, M."https://zbmath.org/authors/?q=ai:serris.m"Ninos, G."https://zbmath.org/authors/?q=ai:ninos.gSummary: In this chapter, we study the Jaynes-Cummings model under multiphoton excitation and in the general case of intensity-dependent coupling strength given by an arbitrary function \(f\). The Jaynes-Cummings theoretical model is of great interest to atomic physics, quantum optics, solid-state physics, and quantum information theory with several applications in coherent control and quantum information processing. As the initial state of the radiation mode, we consider a squeezed state, which is the most general Gaussian pure state. The time evolution of the mean photon number and the dispersions of the two quadrature components of the electromagnetic field are calculated for an arbitrary function \(f\). The mean value of the inversion operator of the atom is also calculated for some simple forms of the function \(f\).
For the entire collection see [Zbl 1485.65002].Stationary optical solitons with complex Ginzburg-Landau equation having nonlinear chromatic dispersion and Kudryashov's refractive index structureshttps://zbmath.org/1496.811142022-11-17T18:59:28.764376Z"Ekici, Mehmet"https://zbmath.org/authors/?q=ai:ekici.mehmetSummary: This work obtains stationary optical solitons for complex Ginzburg-Landau equation that is structured with Kudryashov's self-phase modulation structures. The chromatic dispersion is also taken to be nonlinear. Six forms of nonlinear refractive index are considered. The adopted integration scheme is the generalized \(G^\prime/G\)-expansion approach that yields solutions in terms of Jacobi's elliptic functions. The limiting approach, when applied with the modulus of ellipticity leads to the stationary optical solitons that finally emerge from the model.Ground-state cooling of the mechanical resonator in an optomechanical cavity with two-level atomic ensemblehttps://zbmath.org/1496.811152022-11-17T18:59:28.764376Z"Liu, Ni"https://zbmath.org/authors/?q=ai:liu.ni"Chang, Rui"https://zbmath.org/authors/?q=ai:chang.rui"Zhang, Suying"https://zbmath.org/authors/?q=ai:zhang.suying"Liang, J.-Q."https://zbmath.org/authors/?q=ai:liang.jiuqingSummary: We first propose the ground-state cooling of a mechanical resonator (MR) via a electromagnetically-induced-transparency (EIT)-like cooling mechanism in an optomechanical cavity with two-level atomic ensemble. By tuning optimal parameters in stable region, we meet that the cooling process of the MR corresponds to the maximum value of the optical fluctuation spectrum, while the heating process of the MR corresponds to the minimum value of the optical fluctuation spectrum. Without the original resolved sideband condition, the MR could be cooled to its ground state by manipulating the atom-field coupling strength only satisfying the decay rate is smaller than the MR's frequency, which can be observed by the cooling rate and the mean phonon number. Meanwhile, the action of the atomic ensemble in the ground-state cooling of the MR is equal to the one of the auxiliary cavity in a double-cavity optomechanical system. In addition, the influence of other parameters on the cooling of the MR is also discussed. In the experiment and theory, the optomechanical cavity with two-level atomic ensemble is easier to implement and manipulate than the related double-cavity optomechanical system.Dynamical properties of the field in generalized photon-added pair coherent state in the Jaynes-Cummings modelhttps://zbmath.org/1496.811162022-11-17T18:59:28.764376Z"Thanh, Le Thi Hong"https://zbmath.org/authors/?q=ai:thanh.le-thi-hong"Duc, Truong Minh"https://zbmath.org/authors/?q=ai:duc.truong-minhSummary: This paper studies the time evolution of probabilities, second-order correlation functions, and entanglement via the interaction between the field which is a generalized photon-added pair coherent state (GPAPCS) with a two-level atom in the Jaynes-Cummings model. The dynamical behaviors of the field in the GPAPCS are found to be different compared to that of the field in the original pair coherent state. During the interaction with the atom, the dynamical properties of the entanglement in the GPAPCS are considered in detail by using the linear entropy criterion. The results show the important role of the simultaneous addition of photons to two modes of a pair coherent state in enhancing the non-classical as well as entanglement properties of the GPAPCS.Symmetry-resolved entanglement entropy in critical free-fermion chainshttps://zbmath.org/1496.820032022-11-17T18:59:28.764376Z"Jones, Nick G."https://zbmath.org/authors/?q=ai:jones.nick-gThe entanglement entropy, defined using the reduced density matrix of a multipartite quantum state, plays an important role in understanding the nature of quantum states. For quantum systems with a symmetry, the reduced density matrix can be further projected into the sectors with different symmetry charges to define the so-called symmetry-resolved entanglement entropy for each symmetry sector.
This paper calculates the symmetry-resolved Rényi entanglement entropy of \(L\) consecutive sites in a family of critical free fermionic chains with U(1) symmetry (particle-number conservation). These lattice models have a low-energy effective theory given by \(N\) massless Dirac fermions. The calculation of the symmetry-resolved entanglement entropy is performed by considering the large \(L\) asymptotic expansion of the charged moments of the reduced density matrix, whose Fourier transform gives the symmetry-resolved Rényi entropies. Using Toeplitz determinant theory, the leading and subleading terms of the charged moments are calculated and compared with conformal field theory results. A particular emphasis is given to the analysis of the subleading correction, where the discrepancy in an error term is discussed and open issues are pointed out.
Reviewer: Hong-Hao Tu (Dresden)Dropleton-soliton crossover mediated via trap modulationhttps://zbmath.org/1496.820062022-11-17T18:59:28.764376Z"Debnath, Argha"https://zbmath.org/authors/?q=ai:debnath.argha"Khan, Ayan"https://zbmath.org/authors/?q=ai:khan.ayan"Basu, Saurabh"https://zbmath.org/authors/?q=ai:basu.saurabhSummary: We report a droplet to a soliton crossover by tuning the external confinement potential in a dilute Bose-Einstein condensate by numerically solving the modified Gross-Pitaevskii equation. The testimony of such a crossover is presented via studying the fractional density of the condensate which smoothly migrates from being a flat-head curve at weak confinement to a bright soliton at strong confinement. Such a transition occurs across a region of the potential whose strength varies over an order of magnitude and thus should be fit to be termed as a crossover. We supplement our studies via exploring the size of the bound pairs and the ramifications of the particle density therein. Eventually, all of these aid us in arriving at a phase diagram in a space defined by the trap strength and the particle number that shows the formation of two phases consisting of droplets and solitons, along with a regime of coexistence of these two.Dynamics of a tracer particle interacting with excitations of a Bose-Einstein condensatehttps://zbmath.org/1496.820152022-11-17T18:59:28.764376Z"Lampart, Jonas"https://zbmath.org/authors/?q=ai:lampart.jonas"Pickl, Peter"https://zbmath.org/authors/?q=ai:pickl.peterSummary: We consider the quantum dynamics of a large number \(N\) of interacting bosons coupled a tracer particle, i.e. a particle of another kind, on a torus. We assume that in the initial state the bosons essentially form a homogeneous Bose-Einstein condensate, with some excitations. With an appropriate mean-field scaling of the interactions, we prove that the effective dynamics for \(N\rightarrow \infty\) is generated by the Bogoliubov-Fröhlich Hamiltonian, which couples the tracer particle linearly to the excitation field.Formulation of a phonon band calculation for molecular crystals using a coarse-grained coordinate approach under periodic boundary conditionshttps://zbmath.org/1496.820242022-11-17T18:59:28.764376Z"Houjou, Hirohiko"https://zbmath.org/authors/?q=ai:houjou.hirohiko"Seshimo, Masataka"https://zbmath.org/authors/?q=ai:seshimo.masatakaSummary: A phonon band calculation scheme based on our previously proposed coarse-graining theory under periodic boundary conditions was formulated. Starting with a simple one-dimensional, one-body periodic system, we introduced the basis set of a phase-shift coordinate system that can easily afford the discrete Fourier transformation of vectors and matrices with infinite dimensions. When the unit cell contains two or more bodies, the basis set of the phase-shift coordinate system is represented with tensors. By choosing an appropriate tensor basis set of a coarse-grained space, we can approximately block-diagonalize the dynamical matrix. Then, we can obtain the inertia and stiffness matrices represented by the given coarse-grained coordinate system, upon which the application of the mass-weighted Hessian equation affords a set of angular frequencies (\(\omega\)) as functions of the wavenumber (\(k\)). Thus, the phonon band structure (\(k\)-\(\omega\) plot) is obtained based on the coarse-graining approximation. When this approximation is applied to molecular assemblies comprising hydrogen bonding, the computational error resulting from this scheme is expected to be a maximum of a few \(\mathrm{cm}^{-1}\).Nonlinear band structure of cold atoms with interaction-dependent dispersionhttps://zbmath.org/1496.820252022-11-17T18:59:28.764376Z"Guo, Ze-Hong"https://zbmath.org/authors/?q=ai:guo.ze-hong"Yu, Xue-Jia"https://zbmath.org/authors/?q=ai:yu.xue-jia"Liang, Dan-Dan"https://zbmath.org/authors/?q=ai:liang.dan-dan"Li, Guan-Qiang"https://zbmath.org/authors/?q=ai:li.guanqiang"Li, Zhi"https://zbmath.org/authors/?q=ai:li.zhi.1|li.zhiSummary: Band structure is an important tool to characterize the physical properties of periodic systems. In this work, we investigate the nonlinear spectrum and current density in cold atoms with interaction-dependent dispersion (IDD). The results reveal that IDD causes the nonlinear loop structure, which means that the dynamical stability is destroyed, resulting in the loss of superfluidity. More interestingly, the repulsive IDD induces a more complex deformation of spectrum. Different from the previous studies, the conversion between positive and negative curvature loop structures appears in the system. Furthermore, there will be a pair of triple degeneracy points on the lower band (\(n = 2n_c\)) and a double degeneracy line between them, which will uncover new physical properties, e.g., nonlinear Landau-Zener tunneling. Since the nonlinear interaction of cold atoms is highly controllable through Feshbach resonance, this fascinating phenomenon is expected to be realized in cold atomic systems in the near future.Very special linear gravity: a gauge-invariant graviton masshttps://zbmath.org/1496.830012022-11-17T18:59:28.764376Z"Alfaro, Jorge"https://zbmath.org/authors/?q=ai:alfaro.jorge"Santoni, Alessandro"https://zbmath.org/authors/?q=ai:santoni.alessandroSummary: Linearized gravity in the Very Special Relativity (VSR) framework is considered. We prove that this theory allows for a non-zero graviton mass \(m_g\) without breaking gauge invariance nor modifying the relativistic dispersion relation. We find the analytic solution for the new equations of motion in our gauge choice, verifying as expected the existence of only two physical degrees of freedom. Finally, through the geodesic deviation equation, we confront some results for classic gravitational waves (GW) with the VSR ones: we see that the ratios between VSR effects and classical ones are proportional to \((m_g/E)^2\), \(E\) being the energy of a graviton in the GW. For GW detectable by the interferometers LIGO and VIRGO this ratio is at most \(10^{-20}\). However, for GW in the lower frequency range of future detectors, like LISA, the ratio increases significantly to \(10^{-10}\), that combined with the anisotropic nature of VSR phenomena may lead to observable effects.The Einstein equations and multipole moments at null infinityhttps://zbmath.org/1496.830032022-11-17T18:59:28.764376Z"Tafel, J."https://zbmath.org/authors/?q=ai:tafel.jacekClassical double copy at null infinityhttps://zbmath.org/1496.830052022-11-17T18:59:28.764376Z"Adamo, Tim"https://zbmath.org/authors/?q=ai:adamo.tim"Kol, Uri"https://zbmath.org/authors/?q=ai:kol.uriViscous absorption of ultra-high-frequency gravitonshttps://zbmath.org/1496.830082022-11-17T18:59:28.764376Z"Giovannini, Massimo"https://zbmath.org/authors/?q=ai:giovannini.massimoSummary: The high-frequency gravitons can be absorbed by the first and second viscosities of the post-inflationary plasma as the corresponding wavelengths reenter the Hubble radius prior to big-bang nucleosynthesis. When the total sound speed of the medium is stiffer than radiation the rate of expansion still exceeds the shear rate but the bulk viscosity is not negligible. Depending on the value of the entropy density at the end of inflation the spectral energy density of the relic gravitons gets modified in comparison with the inviscid result when the frequency ranges between the kHz band and the GHz region. In the nHz domain the spectrum inherits a known suppression due to neutrino free-streaming but also a marginal spike potentially caused by a sudden outbreak of the bulk viscosity around the quark-hadron phase transition, as suggested by the hadron spectra produced in the collisions of heavy ions.Displacement-noise-free neutron interferometer for gravitational wave detection using a single Mach-Zehnder configurationhttps://zbmath.org/1496.830092022-11-17T18:59:28.764376Z"Iwaguchi, Shoki"https://zbmath.org/authors/?q=ai:iwaguchi.shoki"Nishizawa, Atsushi"https://zbmath.org/authors/?q=ai:nishizawa.atsushi-j"Chen, Yanbei"https://zbmath.org/authors/?q=ai:chen.yanbei"Kawasaki, Yuki"https://zbmath.org/authors/?q=ai:kawasaki.yuki"Kitaguchi, Masaaki"https://zbmath.org/authors/?q=ai:kitaguchi.masaaki"Morimoto, Taigen"https://zbmath.org/authors/?q=ai:morimoto.taigen"Ishikawa, Tomohiro"https://zbmath.org/authors/?q=ai:ishikawa.tomohiro"Wu, Bin"https://zbmath.org/authors/?q=ai:wu.bin"Watanabe, Izumi"https://zbmath.org/authors/?q=ai:watanabe.izumi"Shimizu, Ryuma"https://zbmath.org/authors/?q=ai:shimizu.ryuma"Shimizu, Hirohiko"https://zbmath.org/authors/?q=ai:shimizu.hirohiko-m"Michimura, Yuta"https://zbmath.org/authors/?q=ai:michimura.yuta"Kawamura, Seiji"https://zbmath.org/authors/?q=ai:kawamura.seijiSummary: The improvement of sensitivity to gravitational waves (GWs) at lower frequencies is still challenging on account of displacement noise. One of the solutions is the neutron displacement-noise-free interferometer (DFI). We focus on a simplification of the detector configuration by taking advantage of the ability to adjust the neutron speed depending on the configuration. The new configuration consists of two beamsplitters and two mirrors, which constitute a single Mach-Zehnder interferometer (MZI). It is simpler than the configuration with two MZIs in previous research. All displacement noise of mirrors and beamsplitters can be canceled in the frequency domain. This cancellation can be explained intuitively using a phasor diagram.Shadows in conformally related gravity theorieshttps://zbmath.org/1496.830132022-11-17T18:59:28.764376Z"Pal, Kunal"https://zbmath.org/authors/?q=ai:pal.kunal"Pal, Kuntal"https://zbmath.org/authors/?q=ai:pal.kuntal"Shaikh, Rajibul"https://zbmath.org/authors/?q=ai:shaikh.rajibul"Sarkar, Tapobrata"https://zbmath.org/authors/?q=ai:sarkar.tapobrataSummary: Null geodesics are invariant under a conformal transformation, and thus it might seem natural to assume that the observables corresponding to the shadow of a space-time are also conformally invariant. Here, we argue instead, that since the Arnowitt-Deser-Misner mass and the active gravitational mass of an asymptotically flat space-time are not, in general, invariant under such conformal transformations, the shadow radius for photon motion in a space-time would be quantitatively different, when viewed from two different conformally related frames, although the expression for the shadow radius is similar. We then use this fact to propose a novel method to constrain the relevant parameters in a gravity theory conformally related to general relativity. As examples of our method, we constrain the parameter space in Brans-Dicke theory, and a class of brane-world gravity models, by using the recent observational data of M\(87^\ast\) by the Event Horizon Telescope.Two-component scalar and fermionic dark matter candidates in a generic \(U(1)_X\) modelhttps://zbmath.org/1496.830182022-11-17T18:59:28.764376Z"Das, Arindam"https://zbmath.org/authors/?q=ai:das.arindam"Gola, Shivam"https://zbmath.org/authors/?q=ai:gola.shivam"Mandal, Sanjoy"https://zbmath.org/authors/?q=ai:mandal.sanjoy"Sinha, Nita"https://zbmath.org/authors/?q=ai:sinha.nitaSummary: We consider a \(U(1)_X \otimes \mathbb{Z}_2 \otimes \mathbb{Z}_2^\prime\) extension of the Standard Model (SM), where the \(U(1)_X\) charge of an SM field is given by a linear combination of its hypercharge and \(B-L\) number. Apart from the SM particle content, the model contains three right-handed neutrinos (RHNs) \(N_R^i\) and two scalars \(\Phi\), \(\chi\), all singlets under the SM gauge group but charged under \(U(1)_X\) gauge group. Two of these additional fields, fermion \(N_R^3\) is odd under \(\mathbb{Z}_2\) and scalar \(\chi\) is odd under \(\mathbb{Z}_2^\prime\) symmetry. Thus both \(\chi\) and \(N_R^3\) contribute to the observed dark matter relic density, leading to two-component dark matter candidates. We study in detail its dark matter properties such as relic density and direct detection taking into account the constraints coming from collider studies. We find that in our model, there can be possible annihilation of one Dark Matter (DM) into the other, which may potentially alter the relic density in a significant way.Scotogenic \(A_5 \rightarrow A_4\) Dirac neutrinos with freeze-in dark matterhttps://zbmath.org/1496.830192022-11-17T18:59:28.764376Z"Ma, Ernest"https://zbmath.org/authors/?q=ai:ma.ernestSummary: Radiative Dirac neutrino masses and their mixing are linked to dark matter through the non-Abelian discrete symmetry \(A_5\) of the 4-dimensional pentatope, softly broken to \(A_4\) of the 3-dimensional tetrahedron. This unifying understanding of neutrino family structure from dark matter is made possible through the interplay of gauge symmetry, renormalizable Lagrangian field theory, and softly broken discrete symmetries. Dark neutral fermions are produced through Higgs decay.Aspects of three-dimensional higher curvatures gravitieshttps://zbmath.org/1496.830252022-11-17T18:59:28.764376Z"Bueno, Pablo"https://zbmath.org/authors/?q=ai:bueno.pablo"Cano, Pablo A."https://zbmath.org/authors/?q=ai:cano.pablo-a"Llorens, Quim"https://zbmath.org/authors/?q=ai:llorens.quim"Moreno, Javier"https://zbmath.org/authors/?q=ai:moreno.javier"van der Velde, Guido"https://zbmath.org/authors/?q=ai:van-der-velde.guidoTopological confinement in Skyrme holographyhttps://zbmath.org/1496.830262022-11-17T18:59:28.764376Z"Cartwright, Casey"https://zbmath.org/authors/?q=ai:cartwright.casey"Harms, Benjamin"https://zbmath.org/authors/?q=ai:harms.benjamin-c"Kaminski, Matthias"https://zbmath.org/authors/?q=ai:kaminski.matthias"Thomale, Ronny"https://zbmath.org/authors/?q=ai:thomale.ronnyAdS-dS stationary rotating black hole exact solution within Einstein-nonlinear electrodynamicshttps://zbmath.org/1496.830282022-11-17T18:59:28.764376Z"García-Díaz, Alberto A."https://zbmath.org/authors/?q=ai:garcia-diaz.alberto-aSummary: In this report the exact rotating charged black hole solution to the Einstein-nonlinear electrodynamics theory with a cosmological constant is presented. This black hole is equipped with mass, rotation parameter, electric and magnetic charges, cosmological constant \(\Lambda\), and three parameters due to the nonlinear electrodynamics: \(\beta\) is associated to the potential vectors \(A_\mu\) and \(^\star P_\mu\), and two constants, \(F_0\) and \(G_0\), due to the presence of the invariants \(F\) and \(G\) in the Lagrangian \(L(F(x^\mu),G(x^\mu))\). This solution is of Petrov type D, characterized by the Weyl tensor eigenvalue \(\Psi_2\), the traceless Ricci tensor eigenvalue \(S=2\Phi_{(11)}\), and the scalar curvature \(R\); it allows for event horizons, exhibits a ring singularity and fulfils the energy conditions. Its Maxwell limit is the de Sitter-Anti-de Sitter-Kerr-Newman black hole solution.Effect of the magnetic charge on weak deflection angle and greybody bound of the black hole in Einstein-Gauss-Bonnet gravityhttps://zbmath.org/1496.830292022-11-17T18:59:28.764376Z"Javed, Wajiha"https://zbmath.org/authors/?q=ai:javed.wajiha"Aqib, Muhammad"https://zbmath.org/authors/?q=ai:aqib.muhammad"Övgün, Ali"https://zbmath.org/authors/?q=ai:ovgun.aliSummary: The objective of this paper is to analyze the weak deflection angle of Einstein-Gauss-Bonnet gravity in the presence of plasma medium. To attain our results, we implement the Gibbons and Werner approach and use the Gauss-Bonnet theorem to Einstein gravity to acquire the resulting deflection angle of photon's ray in the weak field limit. Moreover, we illustrate the behavior of plasma medium and non-plasma mediums on the deflection of photon's ray in the framework of Einstein-Gauss-Bonnet gravity. Similarly, we observe the graphical influences of deflection angle on Einstein-Gauss-Bonnet gravity with the consideration of both plasma and non-plasma mediums. Later, we observe the rigorous bounds phenomenon of the greybody factor in contact with Einstein-Gauss-Bonnet gravity and calculate the outcomes, analyze graphically for specific values of parameters.Interaction of inhomogeneous axions with magnetic fields in the early universehttps://zbmath.org/1496.830382022-11-17T18:59:28.764376Z"Dvornikov, Maxim"https://zbmath.org/authors/?q=ai:dvornikov.maximSummary: We study the system of interacting axions and magnetic fields in the early universe after the quantum chromodynamics phase transition, when axions acquire masses. Both axions and magnetic fields are supposed to be spatially inhomogeneous. We derive the equations for the spatial spectra of these fields, which depend on conformal time. In case of the magnetic field, we deal with the spectra of the energy density and the magnetic helicity density. The evolution equations are obtained in the closed form within the mean field approximation. We choose the parameters of the system and the initial condition which correspond to realistic primordial magnetic fields and axions. The system of equations for the spectra is solved numerically. We compare the cases of inhomogeneous and homogeneous axions. The evolution of the magnetic field in these cases is different only within small time intervals. Generally, magnetic fields are driven mainly by the magnetic diffusion. We find that the magnetic field instability takes place for the amplified initial wavefunction of the homogeneous axion. This instability is suppressed if we account for the inhomogeneity of the axion.Natural chain inflationhttps://zbmath.org/1496.830392022-11-17T18:59:28.764376Z"Freese, Katherine"https://zbmath.org/authors/?q=ai:freese.katherine"Litsa, Aliki"https://zbmath.org/authors/?q=ai:litsa.aliki"Winkler, Martin Wolfgang"https://zbmath.org/authors/?q=ai:winkler.martin-wolfgangSummary: In Chain Inflation the universe tunnels along a series of false vacua of ever-decreasing energy. The main goal of this paper is to embed Chain Inflation in high energy fundamental physics. We begin by illustrating a simple effective formalism for calculating Cosmic Microwave Background (CMB) observables in Chain Inflation. Density perturbations seeding the anisotropies emerge from the probabilistic nature of tunneling (rather than from quantum fluctuations of the inflation). To obtain the correct normalization of the scalar power spectrum and the scalar spectral index, we find an upper limit on the scale of inflation at horizon crossing of CMB scales, \(V_\ast^{1/4} < 10^{12}\) GeV. We then provide an explicit realization of chain inflation, in which the inflaton is identified with an axion in supergravity. The axion enjoys a perturbative shift symmetry which is broken to a discrete remnant by instantons. The model, which we dub `natural chain inflation' satisfies all cosmological constraints and can be embedded into a standard \(\Lambda\)CDM cosmology. Our work provides a major step towards the ultraviolet completion of chain inflation in string theory.Quark condensate and chiral symmetry restoration in neutron starshttps://zbmath.org/1496.850012022-11-17T18:59:28.764376Z"Jin, Hao-Miao"https://zbmath.org/authors/?q=ai:jin.hao-miao"Xia, Cheng-Jun"https://zbmath.org/authors/?q=ai:xia.cheng-jun"Sun, Ting-Ting"https://zbmath.org/authors/?q=ai:sun.tingting"Peng, Guang-Xiong"https://zbmath.org/authors/?q=ai:peng.guang-xiongSummary: Based on an equivparticle model, we investigate the in-medium quark condensate in neutron stars. Carrying out a Taylor expansion of the nuclear binding energy to the order of \(\rho^3\), we obtain a series of EOSs for neutron star matter, which are confronted with the latest nuclear and astrophysical constraints. The in-medium quark condensate is then extracted from the constrained properties of neutron star matter, which decreases non-linearly with density. However, the chiral symmetry is only partially restored with non-vanishing quark condensates, which may vanish at a density that is out of reach for neutron stars.Structure of magnetized strange quark star in perturbative QCDhttps://zbmath.org/1496.850042022-11-17T18:59:28.764376Z"Sedaghat, J."https://zbmath.org/authors/?q=ai:sedaghat.j"Zebarjad, S. M."https://zbmath.org/authors/?q=ai:zebarjad.s-mohammad|zebarjad.seyed-mostafa"Bordbar, G. H."https://zbmath.org/authors/?q=ai:bordbar.g-h"Eslam Panah, B."https://zbmath.org/authors/?q=ai:eslam-panah.bSummary: We have performed the leading order perturbative calculation to obtain the equation of state (EoS) of the strange quark matter (SQM) at zero temperature under the magnetic field \(B = 10^{18}G\). The SQM comprises two massless quark flavors (up and down) and one massive quark flavor (strange). Consequently, we have used the obtained EoS to calculate the maximum gravitational mass and the corresponding radius of the magnetized strange quark star (SQS). We have employed two approaches, including the regular perturbation theory (\textbf{RPT}) and the background perturbation theory (\textbf{BPT}). In \textbf{RPT} the infrared (IR) freezing effect of the coupling constant has not been accounted for, while this effect has been included in \textbf{BPT}. We have obtained the value of the maximum gravitational mass to be more than three times the solar mass. The validity of isotropic structure calculations for SQS has also been investigated. Our results show that the threshold magnetic field from which an anisotropic approach begins to be significant lies in the interval \(2 \times 10^{18}G < B < 3 \times 10^{18}G\). Furthermore, we have computed the redshift, compactness and Buchdahl-Bondi bound of the SQS to show that this compact object cannot be a black hole.