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Universe
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Physics inside and outside Black Holes: Observable Effects of Modified...
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Physics inside and outside Black Holes: Observable Effects of Modified and Quantum Gravity Theories

A special issue of Universe (ISSN 2218-1997). This special issue belongs to the section "Gravitation".

Deadline for manuscript submissions: closed (25 July 2022) | Viewed by 2464

Special Issue Editors

Prof. Dr. Mubasher Jamil

E-Mail Website1 Website2
Guest Editor
1. Institute for Theoretical Physics and Cosmology, Zhejiang University of Technology, Hangzhou 310023, China
2. School of Natural Sciences, National University of Sciences and Technology, Islamabad 44000, Pakistan
Interests: gravitation; mathematical and theoretical aspects of black holes
Dr. Ahmadjon Abdujabbarov

E-Mail Website
Guest Editor
Laboratory of Theoretical Astrophysics, Ulugh Beg Astronomical Institute, Tashkent 100052, Uzbekistan
Interests: relativistic astrophysics; general relativity; neutron stars and black holes
Special Issues, Collections and Topics in MDPI journals
Dr. Seyed Hossein Hendi

E-Mail Website
Guest Editor
1. Department of Physics, School of Science, Shiraz University, Shiraz 71454, Iran
2. Biruni Observatory, School of Science, Shiraz University, Shiraz 71454, Iran
3. Canadian Quantum Research Center 204-3002 32 Ave Vernon, BC V1T 2L7, Canada
Interests: gravitation; theoretical aspects of black holes; nonlinear electrodynamics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Both Hubble- and Planck-scale investigations of the universe strongly suggest that Einstein’s theory of general relativity is incomplete, and needs to be modified and supplemented with necessary corrections. Although numerous models of modified gravity and quantum gravity have been known for a long time, it is important to distinguish the effects of alternative gravity from those of general relativity. Due to their abundance in the observable universe, black holes offer an opportunity to test gravitational theories beyond general relativity.

Prof. Dr. Mubasher Jamil
Dr. Ahmadjon Abdujabbarov
Dr. Seyed Hossein Hendi
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. Universe is an international peer-reviewed open access monthly journal published by MDPI.

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Keywords

  •  black hole solutions and quantum/modified gravity theories
  •  observational tests and phenomenological aspects of quantum/modified gravity black holes
  •  quasinormal modes and super-radiance
  •  Penrose process
  •  accretion and high-energy astrophysical processes near black holes
  •  phase transitions and stability of black holes
  •  black hole shadows
  •  tests of alternative gravity via black hole mergers and gravitational waves

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Published Papers (1 paper)

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Research

21 pages, 747 KiB  
Article
Equatorial and Polar Quasinormal Modes and Quasiperiodic Oscillations of Quantum Deformed Kerr Black Hole
by Kimet Jusufi, Mustapha Azreg-Aïnou, Mubasher Jamil and Qiang Wu
Universe 2022, 8(4), 210; https://doi.org/10.3390/universe8040210 - 26 Mar 2022
Cited by 7 | Viewed by 1910
Abstract
In this paper, we focus on the relation between quasinormal modes (QNMs) and a rotating black hole shadow. As a specific example, we consider the quantum deformed Kerr black hole obtained via Newman–Janis–Azreg-Aïnou algorithm. In particular, using the geometric-optics correspondence between the parameters [...] Read more.
In this paper, we focus on the relation between quasinormal modes (QNMs) and a rotating black hole shadow. As a specific example, we consider the quantum deformed Kerr black hole obtained via Newman–Janis–Azreg-Aïnou algorithm. In particular, using the geometric-optics correspondence between the parameters of a QNMs and the conserved quantities along geodesics, we show that, in the eikonal limit, the real part of QNMs is related to the Keplerian frequency for equatorial orbits. To this end, we explore the typical shadow radius for the viewing angles, θ0=π/2, and obtained an interesting relation in the case of viewing angle θ0=0 (or equivalently θ0=π). Furthermore we have computed the corresponding equatorial and polar modes and the thermodynamical stability of the quantum deformed Kerr black hole. We also investigate other astrophysical applications such as the quasiperiodic oscillations and the motion of S2 star to constrain the quantum deforming parameter. Full article
(This article belongs to the Special Issue Physics inside and outside Black Holes: Observable Effects of Modified and Quantum Gravity Theories)
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