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Symmetry
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Gravitational Physics, Black Holes and Space–Time Symmetry
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Gravitational Physics, Black Holes and Space–Time Symmetry

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

Deadline for manuscript submissions: 28 November 2025 | Viewed by 1096

Special Issue Editors

Dr. Yassine Sekhmani

E-Mail Website
Guest Editor
Département de Physique, Equipe des Sciences de la Matière et du Rayonnement, ESMaR, Faculté des Sciences, Université Mohammed V de Rabat, Rabat 10000, Morocco
Interests: general relativity; teleparallel gravity and alternatives theories; gravitational solutions; cosmology; mathematical physics
Dr. Alexandre Landry

E-Mail Website
Guest Editor
Department of Mathematics and Statistics, Dalhousie University, Halifax, NS B3H 3J5, Canada
Interests: teleparallel gravity and geometry; quantization; special functions; fundamental quantized particles; physical quantum process; differential equations
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The aims of this Special Issue on the Gravitational Physics and Black Hole solutions are to present and highlight the most recent research developments in this topic and the possible spacetime symmetries. This Special Issue will target the gravitational interaction solutions implying the Black Hole (BH), Neutron Stars (NSs), White Dwarf (WD) or any other astrophysical objects. The favored approaches and frameworks are the General Relativity and F(R)-type theories, but also alternative approaches in gravity such as teleparallel gravities and geometries (F(T)-type, New General Relativity, F(Q)-type and other extensions), quantum gravity, string and superstring, to name only a few. We will also focus on space–time structures and symmetries concerning the gravitational and/or astrophysical solutions. Any contribution concerning astrophysical and gravitational physics will be welcome, especially those implying spacetime symmetries, including Riemann and/or teleparallel geometry. We also extend the scope to the mathematics of General Relativity and gravity approaches useful for the topics of this Special Issue.

We hope that new contributions will also be able to interconnect with these same recent advances. In addition, we are open to contributions regarding mathematical innovations in Gravitational Physics, which is an interesting subject in full development.

We look forward to receiving your contributions. The deadline is on 28 November 2025.

Dr. Yassine Sekhmani
Dr. Alexandre Landry
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

  • black hole
  • neutron star
  • white dwarf
  • wormholes
  • general relativity solutions
  • alternative gravity theory solutions
  • quantum gravity theory solutions
  • space–time geometries and symmetries

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Published Papers (2 papers)

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Research

24 pages, 1473 KB  
Article
The Black Hole with a Finite-Sized Core Structure
by Ting-Han Pei
Symmetry 2025, 17(9), 1431; https://doi.org/10.3390/sym17091431 - 2 Sep 2025
Viewed by 426
Abstract
To meet the supergravity requirements of a black hole without a singularity, we propose some possible finite-sized core structures to avoid the confusing singularity problem. This research first studies the Coulomb repulsion between electrons at a distance of 10−15 m, where the [...] Read more.
To meet the supergravity requirements of a black hole without a singularity, we propose some possible finite-sized core structures to avoid the confusing singularity problem. This research first studies the Coulomb repulsion between electrons at a distance of 10−15 m, where the inverse square of the distance is still workable, revealing that the energy of the entire observable universe is required to form a charged region with a radius of 50 m, including 1.4 × 1031 Coulomb electrons. Therefore, the existence of a singularity at the center of a black hole becomes physically unreasonable in this case. To avoid the singularity problem, we propose a finite-sized black hole core in which the inner core is composed of the vast majority of neutrons and a very small amount of 56Fe. Under the conditions of a total charge of 1.648824 × 1020 C and a total mass equivalent to the Sun, a finite-sized black hole is constructed through this finite-sized core model. We use this non-rotating but charged, compact, star-like structure, surrounded by counter-rotating and co-rotating electrons, to construct a Kerr–Newman black hole with a finite-sized core structure. Based on this model, we can obtain the same spacetime as that of a traditional Kerr–Newman black hole. Full article
(This article belongs to the Special Issue Gravitational Physics, Black Holes and Space–Time Symmetry)
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16 pages, 490 KB  
Article
Generalized Planck–Einstein Relation in Curved Spacetimes: Implications for Light Propagation Near Black Holes
by Václav Vavryčuk
Symmetry 2025, 17(9), 1419; https://doi.org/10.3390/sym17091419 - 1 Sep 2025
Cited by 1 | Viewed by 462
Abstract
By applying Maxwell’s equations to curved spacetimes, the Planck–Einstein energy–frequency relation for photons, originally formulated in Minkowski space, is generalized for application in Riemann space. According to this relation, photon energy depends not only on the photon frequency but also on the physical [...] Read more.
By applying Maxwell’s equations to curved spacetimes, the Planck–Einstein energy–frequency relation for photons, originally formulated in Minkowski space, is generalized for application in Riemann space. According to this relation, photon energy depends not only on the photon frequency but also on the physical speed of photons, which may vary when locally measured in non-inertial static frames. In Minkowski space, the energy of free photons is conserved as neither frequency shifts nor changes in photon speed are observed. In Riemann space, energy of free photons also remains conserved as gravitational redshift is compensated by a corresponding variation in photon speed. The generalized Planck–Einstein relation may have significant astrophysical implications, particularly for gravitational lensing, observations of neutron star mergers, supernovae and quasars, the propagation of light near black holes, and expanding cosmologies. Full article
(This article belongs to the Special Issue Gravitational Physics, Black Holes and Space–Time Symmetry)
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