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Symmetry
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Classical and Quantum Phenomena in an Exterior and Interior of...
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Classical and Quantum Phenomena in an Exterior and Interior of the Black Holes

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

Deadline for manuscript submissions: closed (31 July 2022) | Viewed by 2073

Special Issue Editors

Prof. Dr. Andy Augousti

E-Mail Website
Guest Editor
Department of Mechanical Engineering, School of Engineering and the Environment, Kingston University of London, Surrey KT1 1LQ, London, UK
Interests: optical and acoustic sensors for physical and biomedical measurements; modeling of the eye; rocket engine development; communication in and around black holes
Prof. Dr. Arkady Popov

E-Mail Website
Guest Editor
Department of Geometry, N.I.Lobachevsky Institute of Mathematics and Mechanics, Kazan Federal University, 420008, Kremlevskaya street 18, Kazan, Russia
Interests: gravity; physics
Prof. Andrzej Radosz

E-Mail Website
Guest Editor
Department of Quantum Technologies, Wroclaw University of Science and Technology, 52-213 Wroclaw, Poland
Interests: quantum mechanics; solid state physics; cosmology
Prof. Dr. Oleg Zaslavskii

E-Mail Website
Guest Editor
Institute of Astronomy, Kharkov V.N. Karazin National University, 4 Svoboda Square, Kharkov 61022, Ukraine
Interests: astronomy; black holes; particles

Special Issue Information

Dear Colleagues,

One of the most interesting manifestations of strong gravitational fields is the presence of Black Holes (BHs). An event horizon is a semi-permeable border of a BH: it may be crossed once and in one direction only. At the event horizon of a Schwarzschild BH, the coordinates r and t interchange their roles: the former becomes temporal and the latter spatial inside the horizon. This may seem a coordinate-like effect, but in fact, it reflects particular symmetry properties of the spacetime. The time-like Killing vector representing energy conservation outside the horizon becomes a space-like vector inside the horizon representing (t-component) momentum conservation.

This context, the (a)symmetry of the exterior and interior of the Schwarzschild BH, leads to questions about specific features of classical and quantum phenomena in strong gravitational fields in the vicinity of BH horizons. The guest editors of this Special Issue hope to attract experts in the field and to present state-of-the-art research in the following topics:

  1. Dynamical properties of the interior of BHs;
  2. High-energy collisions in the vicinity of the horizon(s);
  3. BH physics in modified gravity theories;
  4. Radiation reaction near a BH and its application to extreme mass ratio inspirals as astrophysical sources of gravitational waves;
  5. Thermodynamics of BHs;
  6. Gravitational lensing by BHs;
  7. Extensions of the no-hair theorem for the Einstein–Maxwell case to broader applications, including other potential universal characteristics beyond mass, charge, and angular momentum;
  8. Particle creation inside BHs;
  9. Quantum phenomena in BH physics.

Contributions should seek to emphasize the basis of the work in spacetime symmetries or indeed interesting asymmetries.

Prof. Dr. Andy Augousti
Prof. Dr. Arkady Popov
Prof. Andrzej Radosz
Prof. Dr. Oleg Zaslavskii
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.

Published Papers (2 papers)

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Research

13 pages, 300 KiB  
Article
Unbounded Energy Collisions inside and outside Black Holes
by Andy T. Augousti, Pawel Gusin, Andrzej Radosz and Romuald J. Ściborski
Symmetry 2022, 14(6), 1242; https://doi.org/10.3390/sym14061242 - 15 Jun 2022
Viewed by 1046
Abstract
The possibility of on-horizon collisions of unbounded energy in the case of an extreme Kerr black hole is known as the BSW effect. It is also a widely accepted point of view that the energy collision of two identical particles of mass m [...] Read more.
The possibility of on-horizon collisions of unbounded energy in the case of an extreme Kerr black hole is known as the BSW effect. It is also a widely accepted point of view that the energy collision of two identical particles of mass m near the horizon of a Schwarzschild black hole is limited to a value of 25 m. We show that there are two possible scenarios for unbounded energy collisions both for the exterior and for the interior of spherically symmetric black holes. Similar scenarios are found for axially symmetric black holes. It is shown that divergent (infinite) energy on-(inner)horizon collisions are excluded due to the anisotropic character of the dynamics of black hole interiors. Full article
(This article belongs to the Special Issue Classical and Quantum Phenomena in an Exterior and Interior of the Black Holes)
13 pages, 326 KiB  
Article
Regular Frames for Spherically Symmetric Black Holes Revisited
by Alexey V. Toporensky and Oleg B. Zaslavskii
Symmetry 2022, 14(1), 40; https://doi.org/10.3390/sym14010040 - 29 Dec 2021
Cited by 4 | Viewed by 1475
Abstract
We consider a space-time of a spherically symmetric black hole with one simple horizon. As a standard coordinate frame fails in its vicinity, this requires continuation across the horizon and constructing frames which are regular there. Up to now, several standard frames of [...] Read more.
We consider a space-time of a spherically symmetric black hole with one simple horizon. As a standard coordinate frame fails in its vicinity, this requires continuation across the horizon and constructing frames which are regular there. Up to now, several standard frames of such a kind are known. It was shown in the literature before, how some of them can be united in one picture as different limits of a general scheme. However, some types of frames (the Kruskal–Szekeres and Lemaître ones) and transformations to them from the original one remained completely disjoint. We show that the Kruskal–Szekeres and Lemaître frames stem from the same root. Overall, our approach in some sense completes the procedure and gives the most general scheme. We relate the parameter of transformation e0 to the specific energy of fiducial observers and show that in the limit e0→0, a homogeneous metric under the horizon can be obtained by a smooth limiting transition. Full article
(This article belongs to the Special Issue Classical and Quantum Phenomena in an Exterior and Interior of the Black Holes)
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