Article
Astronomy & Astrophysics
Ashmita Das, Soham Sen, Sunandan Gangopadhyay
Summary: We study the virtual transition of an atom-mirror system with the simultaneous emission of two scalar photons and a relative acceleration between them. Previous literature has shown that for single photon emission, the transition probabilities of an atom accelerating with respect to the mirror and its reverse are equivalent under the swap of atom and field frequencies. However, our research reveals that the equivalence between the transition probabilities is destroyed when dual photons are emitted simultaneously.
Article
Astronomy & Astrophysics
Abhinove Nagarajan Seenivasan, Sayan Chakrabarti, Bibhas Ranjan Majhi
Summary: We revisit the thermodynamic description of a fluid in scalar-tensor gravity theory and propose a general approach to study the thermodynamics of relativistic fluids. By using an equivalent description of gravitational dynamics in both Jordan and Einstein frames, we identify the energy-momentum tensors for the scalar fluid as that of an ideal fluid. We also point out issues with using Eckart's formalism for an ideal fluid and suggest a possible alternative description valid for a general ideal fluid.
Article
Astronomy & Astrophysics
Samson Ojako, Rituparno Goswami, Sunil D. Maharaj
Summary: This paper investigates a class of conformally symmetric solutions for spherically symmetric massless scalar field collapse, where the spatial variations of the conformal factor can be neglected in the later stages of collapse. The obtained solutions exhibit self-similarity near the central singularity, and the critical phenomenon observed in self-similar collapse applies to this new class of solutions. The study simplifies the Roberts model for a massless scalar field.
GENERAL RELATIVITY AND GRAVITATION
(2021)
Article
Mathematics
Alfredo D. Millano, Genly Leon, Andronikos Paliathanasis
Summary: We perform a detailed study of the phase-space of the field equations of an Einstein-Gauss-Bonnet scalar field cosmology for a spatially flat Friedmann-Lemaitre-Robertson-Walker spacetime. We consider the exponential function for the scalar field potential and assume two cases for the coupling function of the scalar field with the Gauss-Bonnet term: the exponential function and the power-law function. By writing the field equations in dimensionless variables and studying the equilibrium points using normalized and compactified variables, we recover previous results and discover new asymptotic solutions. These couplings provide a rich cosmological phenomenology.
Article
Astronomy & Astrophysics
Julio C. Fabris, Tales Augusto Oliveira Gomes, Denis Campos Rodrigues
Summary: This paper investigates charged black hole and wormhole solutions in the Einstein-Maxwell system with a massless, real scalar field. By using a conformal transformation, the possible static, spherically symmetric structures in the minimal coupled system are described. Besides wormholes and naked singularities, there exists a restricted class of black holes with an infinite surface and a timelike central singularity.
Article
Physics, Mathematical
Xiaokai He, Zhoujian Cao
Summary: This study investigates the generalization of ten conserved quantities (Newman-Penrose constants) defined in asymptotically flat vacuum spacetimes to asymptotically flat Einstein-scalar spacetimes. It is discovered that these quantities, when appropriately modified, are also conserved in an Einstein-scalar system.
JOURNAL OF MATHEMATICAL PHYSICS
(2023)
Article
Astronomy & Astrophysics
Noah Glennon, Chanda Prescod-Weinstein
Summary: The study introduces a modification of the PySiUltraLight code for modeling the dynamical evolution of ultralight axionlike scalar dark matter fields, incorporating a quartic self-interaction term. Results show that solitons are unstable and explode when the soliton mass is below the critical mass and the initial radius falls within a specific range.
Article
Physics, Multidisciplinary
Felipe A. Asenjo, Sergio A. Hojman
Summary: It has been shown that any cosmological anisotropic model can generate supersymmetric theories for both massless scalar and electromagnetic fields. These theories are the time-domain equivalents of supersymmetric quantum mechanics algebra theory. The variations of the anisotropic scale factors in the Universe are responsible for triggering the supersymmetry. For scalar fields, the superpartner fields evolve in two different cosmological scenarios, while for propagating electromagnetic fields, supersymmetry manifests through polarization degrees of freedom in a single Universe.
Article
Astronomy & Astrophysics
Masato Nozawa
Summary: A method to generate static solutions in the Einstein-Maxwell system with a (phantom) dilaton field in n(>= 4) dimensions is presented, revealing critical values and target space differences in the system. The study applies formalism to charge up neutral solutions and discusses global structures, highlighting the presence of curvature singularities in certain solution classes. The dilatonic-charged Ellis-Bronnikov solution is shown to represent a regular wormhole spacetime in certain parameter ranges.
Article
Physics, Particles & Fields
Sourav Bhattacharya, Nitin Joshi, Shagun Kaushal
Summary: We have studied the decoherence mechanism in a fermion and scalar quantum field theory with the Yukawa interaction in the Minkowski spacetime. By using the non-equilibrium effective field theory formalism, we have shown that the ignorance of information stored in higher-order correlators leads to decoherence and entropy generation. We have derived the renormalised Kadanoff-Baym equation and computed the von Neumann entropy to measure the decoherence.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Multidisciplinary
Chaitanya S. Paranjape, Goekhan Yalniz, Yohann Duguet, Nazmi Burak Budanur, Bjoern Hof
Summary: Viscous flows through pipes and channels transition from laminar to turbulent motion as the velocity increases, but the understanding of this discontinuous change within the framework of the Navier-Stokes equations is limited. By studying transitional channel flow, researchers have been able to identify the complete path that connects fully turbulent motion to an invariant solution, and have found that turbulence destabilizes rapidly with increasing Reynolds numbers (Re), marking the transition between deterministic and stochastic dynamics.
PHYSICAL REVIEW LETTERS
(2023)
Article
Mathematics, Applied
Jongmin Han, Juhee Sohn
Summary: In this article, we study a Klein-Gordon-Maxwell system with two scalar fields. It is proved that there exists a ground state solution under the condition 2 < p < 6 and suitable constraints on and mi for i = 1, 2.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2023)
Article
Physics, Particles & Fields
Daniele Bielli, Vaibhav Gautam, Alessandro Torrielli
Summary: In this paper, we investigate the form factors for the massless scattering of integrable AdS(2) superstrings. We utilize the difference-form of the S-matrix to implement the relativistic form factor bootstrap due to the non-standard nature of the S-matrix. By considering the limit of a better-behaved S-matrix found by Fendley, we establish the coincidence between the previously conjectured massless AdS(2) dressing factor and the limit of the De Martino-Moriconi improved dressing factor for the Fendley S-matrix. Additionally, we solve the form factor constraints in the two-particle case and provide integral representations of relativistic dressing factors that satisfy specific assumptions, using them to prove crossing and unitarity relations.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Dumitru Astefanesei, Hyat Huang, Jutta Kunz, Eugen Radu
Summary: This paper investigates an Einstein-scalar field model that represents a consistent truncation of N = 8 D = 4 gauged supergravity. The scalar field in this model has an unbounded potential below and a tachyonic mass above the Breitenlohner-Freedman bound. The study focuses on spherically symmetric asymptotically anti-de Sitter soliton and black hole solutions, aiming to clarify the asymptotics and possible boundary conditions at infinity. The findings are compared with those of an Einstein-scalar field model with the same scalar mass but a quartic self-interaction term. The existence of solitonic solutions, which serve as nonlinear continuations of scalar multipolar clouds, is also argued, with emphasis on the dipole case. Exact solutions are obtained for solitons with a monopole and dipole scalar field as perturbations around the AdS background.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Mathematics, Interdisciplinary Applications
I. Andrade, D. Bazeia, M. A. Marques, R. Menezes
Summary: In this study, we investigate a Maxwell-scalar model that couples the scalar field and gauge field either through electric permittivity or in the presence of impurity. By considering one-dimensional space, we identify the conditions under which the model with impurity can be treated as an effective model for the Maxwell-scalar system, yielding similar solutions. We also explore a specific class of impurities that modifies the core of the scalar field and find the corresponding nontrivial charge densities and electric fields.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Physics, Particles & Fields
Aron Jansen, Andrzej Rostworowski, Mieszko Rutkowski
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Astronomy & Astrophysics
David Fajman, Gernot Heissel, Maciej Maliborski
CLASSICAL AND QUANTUM GRAVITY
(2020)
Article
Astronomy & Astrophysics
Piotr Bizon, Dominika Hunik-Kostyra, Maciej Maliborski
CLASSICAL AND QUANTUM GRAVITY
(2020)
Article
Mathematics, Applied
Piotr Bizon, Maciej Maliborski
Article
Mathematics, Applied
Irfan Glogic, Maciej Maliborski, Birgit Schoerkhuber
Article
Physics, Particles & Fields
P. T. Chrusciel, Sk J. Hoque, M. Maliborski, T. Smolka
Summary: The study analyzes the canonical energy of vacuum linearized gravitational fields on light cones in different backgrounds, showing that the energy diverges when Λ>0 but a renormalized formula with well defined flux is obtained. It is also demonstrated that the renormalized energy in a specific gauge coincides with the quadratization of the generalized Trautman-Bondi mass.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Mathematics, Applied
Piotr Bizon, Bradley Cownden, Maciej Maliborski
Summary: In this paper, we consider a toy model to understand the soliton resolution phenomenon. We focus on the advantages of using outgoing null foliations in analyzing the relaxation processes due to energy dispersal by radiation. We show numerically that certain non-radiative configurations are attractors in the evolution process, and we analyze their convergence rates in detail.
Article
Astronomy & Astrophysics
Joel Kurzweil, Maciej Maliborski
Summary: This paper revisits the box Minkowski model and provides a strong argument that it is unstable and leads to black hole formation for arbitrarily small generic perturbations. By studying the properties and conserved quantities of the resonant system, it is found that the generic solution becomes singular in finite time. The interaction coefficients have a relatively simple form, making this model an attractive toy model for turbulent gravitational instability.
Article
Astronomy & Astrophysics
Mieszko Rutkowski, Andrzej Rostworowski
Summary: Authors argued that a rotating gravastar is a good candidate for the Kerr metric source based on second order perturbation analysis, but further study constructing a perturbative solution up to the third order revealed that it cannot be continuously matched with Kerr spacetime once demanding the finiteness of the Kretschmann scalar expansion.
Article
Astronomy & Astrophysics
Piotr T. Chrusciel, Maciej Maliborski, Nicolas Yunes
Article
Astronomy & Astrophysics
Andrzej Rostworowski
Article
Astronomy & Astrophysics
Hamed Barzegar, Piotr T. Chrusciel, Michael Hoerzinger, Maciej Maliborski, Luc Nguyen
Article
Astronomy & Astrophysics
Maciej Maliborski, Oliver Rinne
Article
Physics, Mathematical
Piotr Bizon, Ben Craps, Oleg Evnin, Dominika Hunik, Vincent Luyten, Maciej Maliborski
COMMUNICATIONS IN MATHEMATICAL PHYSICS
(2017)
Article
Physics, Multidisciplinary
Piotr Bizon, Andrzej Rostworowski
ACTA PHYSICA POLONICA B
(2017)
