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Symmetry
Special Issues
Recent Advance in Astrophysics
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Recent Advance in Astrophysics

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Physics".

Deadline for manuscript submissions: closed (30 April 2022) | Viewed by 5638

Special Issue Editors

Prof. Mikhail E. Prokhorov

E-Mail Website
Guest Editor
Sternberg Astronomicai Institute, Lomonosov Moscow State University, Universitetsky prospect 13, 119991 Moscow, Russia
Interests: binary stars; neutron stars; black holes; accretion; stellar photometry; orientation in space
Prof. Dr. Ilya Kovalenko

E-Mail Website
Co-Guest Editor
Department of Theoretical Physics and Wave Processes, Volgograd State University, 400062 Volgograd, Russia
Interests: quantum information; visualization; turbulence; signal processing; computer simulation; interstellar medium; gas dynamics; galaxy dynamics; hydrodynamical instabilities; accretion processes; radar astronomy; fractal calculus

Special Issue Information

Dear Colleagues,

Symmetry and its violation are not the most common features of astrophysical processes, but these phenomena are found in all areas of astrophysical research. These manifestations include axisymmetric accretion disks and their disturbance by tidal forces, the emergence and maintenance of spiral arms in galaxies, symmetry breaking during phase transitions in the early universe and during baryosynthesis, asymmetry during supernova explosions, single and double jets in quasars and gamma-ray bursts, gravitational lensing and resonance phenomena in celestial mechanics, etc.

This Special Issue of the interdisciplinary journal Symmetry will collect observational and theoretical contributions related to symmetry or its violation from various fields of astrophysics, astronomy, and unrelated disciplines.

Prof. Mikhail E. Prokhorov
Guest Editor

Prof. Dr. Ilya Kovalenko
Co-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. Symmetry is an international peer-reviewed open access monthly 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 2400 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.

Keywords

  • accretion discs
  • binary stars
  • variable stars
  • early universe
  • jets
  • supernova
  • gamma-ray bursts
  • celestial mechanics
  • tides
  • gravitational lensing
  • spiral arms in galaxies

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

Published Papers (2 papers)

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Research

21 pages, 353 KiB  
Article
Dynamics of Hyperbolically Symmetric Fluids
by Luis Herrera, Alicia Di Prisco and Justo Ospino
Symmetry 2021, 13(9), 1568; https://doi.org/10.3390/sym13091568 - 26 Aug 2021
Cited by 15 | Viewed by 1516
Abstract
We study the general properties of dissipative fluid distributions endowed with hyperbolical symmetry. Their physical properties are analyzed in detail. It is shown that the energy density is necessarily negative, and the central region cannot be attained by any fluid element. We describe [...] Read more.
We study the general properties of dissipative fluid distributions endowed with hyperbolical symmetry. Their physical properties are analyzed in detail. It is shown that the energy density is necessarily negative, and the central region cannot be attained by any fluid element. We describe this inner region by a vacuum cavity around the center. By assuming a causal transport equation some interesting thermodynamical properties of these fluids are found. Several exact analytical solutions, which evolve in the quasi–homologous regime and satisfy the vanishing complexity factor condition, are exhibited. Full article
(This article belongs to the Special Issue Recent Advance in Astrophysics)
20 pages, 802 KiB  
Article
Periodic Solutions of Nonlinear Relative Motion Satellites
by Ashok Kumar Pal, Elbaz I. Abouelmagd, Juan Luis García Guirao and Dariusz W. Brzeziński
Symmetry 2021, 13(4), 595; https://doi.org/10.3390/sym13040595 - 2 Apr 2021
Cited by 10 | Viewed by 3274
Abstract
The relative motion of an outline of the rendezvous problem has been studied by assuming that the chief satellite is in circular symmetric orbits. The legitimacy of perturbation techniques and nonlinear relative motion are investigated. The deputy satellite equations of motion with respect [...] Read more.
The relative motion of an outline of the rendezvous problem has been studied by assuming that the chief satellite is in circular symmetric orbits. The legitimacy of perturbation techniques and nonlinear relative motion are investigated. The deputy satellite equations of motion with respect to the fixed references at the center of the chief satellite are nonlinear in the general case. We found the periodic solutions of the linear relative motion satellite and for the nonlinear relative motion satellite using the Lindstedt–Poincaré technique. Comparisons among the analytical solutions of linear and nonlinear motions and the obtained solution by the numerical integration of the explicit Euler method for both motions are investigated. We demonstrate that both analytical and numerical solutions of linear motion are symmetric periodic. However, the solutions of nonlinear motion obtained by the Lindstedt–Poincaré technique are periodic and the numerical solutions obtained by integration by using explicit Euler method are non-periodic. Thus, the Lindstedt–Poincaré technique is recommended for designing the periodic solutions. Furthermore, a comparison between linear and nonlinear analytical solutions of relative motion is investigated graphically. Full article
(This article belongs to the Special Issue Recent Advance in Astrophysics)
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