Special Issue "Gravitational Lensing and Radiation of Compact Objects: Weak/Strong Lensing, Quasinormal Modes, Hawking Radiation, and Gravitational Waves in Astrophysics"

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

Deadline for manuscript submissions: 31 January 2024 | Viewed by 1133

Special Issue Editor

Physics Department, Eastern Mediterranean University, Via Mersin 10, Famagusta 99628, North Cyprus, Turkey
Interests: Hawking radiation; quasinormal modes; Dirac equation; entropic force; information paradox

Special Issue Information

Dear Colleagues,

Numerous gravitational theories, including general relativity, predict that compact objects (white dwarfs, neutron stars, and black holes) appear in strong fields. Today, evidence for the existence of black holes, according to recent astronomical observations, has become indisputable. However, more extensive research is needed for a more accurate evaluation of the properties of these objects and for a more precise answer to the question of what kind of compact objects are observed. Through the phenomenon of gravitational lensing, thermal and gravitational wave emissions, and distinctive resonance frequencies called quasi-normal modes, it will be possible to learn details about the physical properties of many black holes and other cosmologically compact objects such as neutron stars. Overall, in this Special Issue, we will cover research into the identification and characterization of compact astronomical objects in the cosmos.

Prof. Dr. İzzet Sakalli
Guest Editor

Manuscript Submission Information

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Published Papers (1 paper)

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Superradiant (In)stability, Greybody Radiation, and Quasinormal Modes of Rotating Black Holes in Non-Linear Maxwell f(R) Gravity
Symmetry 2023, 15(4), 873; https://doi.org/10.3390/sym15040873 - 06 Apr 2023
Cited by 1 | Viewed by 726
This work is dedicated to the investigation of the superradiant stability of a rotating black hole derived from the nonlinear Maxwell theory of gravity, f(R). The evaluation of stability and instability in this study will be based on the [...] Read more.
This work is dedicated to the investigation of the superradiant stability of a rotating black hole derived from the nonlinear Maxwell theory of gravity, f(R). The evaluation of stability and instability in this study will be based on the absence and presence of the magnetic field, respectively, when the magnetic field constant is c4=0 and c40. For the black hole under discussion, analyses of the greybody factors (GFs) and quasi-normal modes (QNMs) are also carried out. To this end, we first consider the Klein–Gordon equation for the scalar waves propagating in the black hole’s geometry. The resulting radial equation is then reduced to a one-dimensional Schrödinger-like wave equation with effective potential energy. The effects of the nonlinear Maxwell f(R) gravity theory parameters (q, c, and c4) on the effective potential, GFs, and QNMs are examined. The results demonstrate that, although the parameters q, c, and c4 all influence the effective potential, they do not affect the GFs and QNMs. All results are presented and summarized using appropriate graphics and tables. Full article
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