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Selected Papers from "The Modern Physics of Compact Stars and...
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Selected Papers from "The Modern Physics of Compact Stars and Relativistic Gravity 2023"

A special issue of Particles (ISSN 2571-712X).

Deadline for manuscript submissions: closed (31 October 2024) | Viewed by 1574

Special Issue Editor

Prof. Dr. Aram Saharian

E-Mail Website
Guest Editor
Department of Physics, Yerevan State University, Alex Manoogian Street, 0025 Yerevan, Armenia
Interests: quantum effects in external fields; the Casimir effect; string effective gravity and cosmology; alternative theories of gravity
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

With great pleasure, we would like to announce that, based on presentations at “The Modern Physics of Compact Stars and Relativistic Gravity 2023” (https://indico.cern.ch/event/1234609/), selected papers will be published in this Special Issue of Particles, an MDPI open access journal. Manuscripts submitted to this Special Issue should contain original work or be a review of the field of expertise of the author(s). All submissions will be peer-reviewed by internationally recognized experts.

The conference “The Modern Physics of Compact Stars and Relativistic Gravity 2023” is the 7th in a series. These series aim to connect people working in the astrophysics of compact stars, the physics of dense matter, gravitation, and cosmology, observations of pulsars, and binary neutron stars and related fields. We hope that the Special Issue becomes a useful reference both for beginners and experienced researchers in the field of compact star physics.

The Guest Editors invite you to submit unpublished and original research articles related to this topic for publication in this Special Issue of Particles. The Article Processing Charge (APC) for submissions from the conference will be waived, and publication will be free of charge.

Prof. Dr. Aram Saharian
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Particles is an international peer-reviewed open access quarterly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

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Further information on MDPI's Special Issue polices can be found here.

Published Papers (2 papers)

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24 pages, 9885 KiB  
Article
General Three-Body Problem in Conformal-Euclidean Space: New Properties of a Low-Dimensional Dynamical System
by Ashot S. Gevorkyan, Aleksander V. Bogdanov and Vladimir V. Mareev
Particles 2024, 7(4), 1038-1061; https://doi.org/10.3390/particles7040063 - 20 Nov 2024
Viewed by 520
Abstract
Despite the huge number of studies of the three-body problem in physics and mathematics, the study of this problem remains relevant due to both its wide practical application and taking into account its fundamental importance for the theory of dynamical systems. In addition, [...] Read more.
Despite the huge number of studies of the three-body problem in physics and mathematics, the study of this problem remains relevant due to both its wide practical application and taking into account its fundamental importance for the theory of dynamical systems. In addition, one often has to answer the cognitive question: is irreversibility fundamental for the description of the classical world? To answer this question, we considered a reference classical dynamical system, the general three-body problem, formulating it in conformal Euclidean space and rigorously proving its equivalence to the Newtonian three-body problem. It has been proven that a curved configuration space with a local coordinate system reveals new hidden symmetries of the internal motion of a dynamical system, which makes it possible to reduce the problem to a sixth-order system instead of the eighth order. An important consequence of the developed representation is that the chronologizing parameter of the motion of a system of bodies, which we call internal time, differs significantly from ordinary time in its properties. In particular, it more accurately describes the irreversible nature of multichannel scattering in a three-body system and other chaotic properties of a dynamical system. The paper derives an equation describing the evolution of the flow of geodesic trajectories, with the help of which the entropy of the system is constructed. New criteria for assessing the complexity of a low-dimensional dynamical system and the dimension of stochastic fractal structures arising in three-dimensional space are obtained. An effective mathematical algorithm is developed for the numerical simulation of the general three-body problem, which is traditionally a difficult-to-solve system of stiff ordinary differential equations. Full article
(This article belongs to the Special Issue Selected Papers from "The Modern Physics of Compact Stars and Relativistic Gravity 2023")
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17 pages, 423 KiB  
Article
Thermal Conductivity and Thermal Hall Effect in Dense Electron-Ion Plasma
by Arus Harutyunyan and Armen Sedrakian
Particles 2024, 7(4), 967-983; https://doi.org/10.3390/particles7040059 - 11 Nov 2024
Viewed by 417
Abstract
In this study, we examine thermal conductivity and the thermal Hall effect in electron-ion plasmas relevant to hot neutron stars, white dwarfs, and binary neutron star mergers, focusing on densities found in the outer crusts of neutron stars and the interiors of white [...] Read more.
In this study, we examine thermal conductivity and the thermal Hall effect in electron-ion plasmas relevant to hot neutron stars, white dwarfs, and binary neutron star mergers, focusing on densities found in the outer crusts of neutron stars and the interiors of white dwarfs. We consider plasma consisting of single species of ions, which could be either iron Fe56 or carbon C12 nuclei. The temperature range explored is from the melting temperature of the solid T∼109 K up to 1011 K. This covers both degenerate and non-degenerate electron regimes. We find that thermal conductivity increases with density and temperature for which we provide analytical scaling relations valid in different regimes. The impact of magnetic fields on thermal conductivity is also analyzed, showing anisotropy in low-density regions and the presence of the thermal Hall effect characterized by the Righi–Leduc coefficient. The transition froma degenerate to non-degenerate regime is characterized by a minimum ratio of thermal conductivity to temperature, which is analogous to the minimum observed already in the case of electrical conductivity. We provide also formulas fit to our numerical results, which can be used in dissipative magneto-hydrodynamics simulations of warm compact stars. Full article
(This article belongs to the Special Issue Selected Papers from "The Modern Physics of Compact Stars and Relativistic Gravity 2023")
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