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Symmetry
Special Issues
Symmetry in Cosmology and Gravity: Topic and Advance
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Symmetry in Cosmology and Gravity: Topic and Advance

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

Deadline for manuscript submissions: closed (10 June 2023) | Viewed by 1905

Special Issue Editors

Dr. Damianos Iosifidis

E-Mail Website
Guest Editor
Institute of Theoretical Physics, Department of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
Interests: cosmology; special and general relativity; general relativity; theoretical particle physics; physical cosmology; fundamental physics; field theory; gravitational physics; quantum field theory; theoretical high energy physics
Dr. Lucrezia Ravera

E-Mail Website
Guest Editor
1. DISAT, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
2. INFN, Sezione di Torino, Via P. Giuria 1, 10125 Torino, Italy
Interests: theoretical high-energy physics; fundamental symmetries; supergravity; modified gravity; gauge field theory; relational formalism; differential geometry
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Geometric extensions of general relativity (GR) have attracted much attention in recent years due to their naturally clear interpretation as well as the interesting alternative cosmological scenarios they provide. Probably the most well-known such extensions is the metric-affine as well as the teleparallel formulations, the latter being a specific subcase of the former where the affine connection is restricted to yield vanishing curvature. The purpose of this Special Issue is to study further such generalizations/extensions of GR especially in regard to symmetry as well as their cosmological applications.

Submit your paper and select the Journal “Symmetry” and the Special Issue “Symmetry in Cosmology and Gravity: Topic and Advance ” via: MDPI submission system. Our papers will be published on a rolling basis and we will be pleased to receive your submission once you have finished it.

Dr. Damianos Iosifidis
Dr. Lucrezia Ravera
Guest Editors

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

  • Modified gravity
  • Metric-affine gravity, torsion, non-metricity
  • Teleparallel gravity
  • Cosmology

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Published Papers (2 papers)

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Research

18 pages, 324 KiB  
Article
Expansion-Free Dissipative Fluid Spheres: Analytical Solutions
by Luis Herrera, Alicia Di Prisco and Justo Ospino
Symmetry 2023, 15(3), 754; https://doi.org/10.3390/sym15030754 - 19 Mar 2023
Cited by 11 | Viewed by 1496
Abstract
We search for exact analytical solutions of spherically symmetric dissipative fluid distributions satisfying the vanishing expansion condition (vanishing expansion scalar Θ). To accomplish this, we shall impose additional restrictions allowing integration of the field equations. The solutions are analyzed, and possible applications [...] Read more.
We search for exact analytical solutions of spherically symmetric dissipative fluid distributions satisfying the vanishing expansion condition (vanishing expansion scalar Θ). To accomplish this, we shall impose additional restrictions allowing integration of the field equations. The solutions are analyzed, and possible applications to astrophysical scenarios as well as alternative approaches to obtaining new solutions are discussed. Full article
(This article belongs to the Special Issue Symmetry in Cosmology and Gravity: Topic and Advance)
8 pages, 303 KiB  
Article
Polyadic Rings of p-Adic Integers
by Steven Duplij
Symmetry 2022, 14(12), 2591; https://doi.org/10.3390/sym14122591 - 7 Dec 2022
Viewed by 1297
Abstract
In this note, we first recall that the sets of all representatives of some special ordinary residue classes become m,n-rings. Second, we introduce a possible p-adic analog of the residue class modulo a p-adic integer. Then, we find [...] Read more.
In this note, we first recall that the sets of all representatives of some special ordinary residue classes become m,n-rings. Second, we introduce a possible p-adic analog of the residue class modulo a p-adic integer. Then, we find the relations which determine when the representatives form a m,n-ring. At very short spacetime scales, such rings could lead to new symmetries of modern particle models. Full article
(This article belongs to the Special Issue Symmetry in Cosmology and Gravity: Topic and Advance)
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