Symmetry in Researches of Neutron Stars and Black Holes

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

Deadline for manuscript submissions: closed (31 January 2025) | Viewed by 1701

Special Issue Editors


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Guest Editor
Faculty of Physics, University of Bucharest, Magurele, Romania
Interests: detectors; radioactivity; scintillation; nuclear reactions; radiation detection

E-Mail Website
Guest Editor
Faculty of Physics, University of Bucharest, Magurele, Romania
Interests: weakly interacting massive partiles; detectors; nuclear physics

Special Issue Information

Dear Colleagues,

This Special Issue focuses on the role of symmetry in the study of neutron stars and black holes, two of the most mysterious objects in the universe. Symmetry plays a crucial role in our understanding of the physical laws governing these celestial bodies, influencing their formation, structure, and dynamics. This Special Issue aims to bring together a diverse range of research that contributes to the advancement of our knowledge of neutron stars and black holes. Contributions from theoretical, observational, and computational perspectives are welcome, providing a comprehensive view of how symmetry shapes our understanding of these enigmatic objects.

“Because there is a law such as gravity, the universe can and will create itself from nothing. Spontaneous creation is the reason there is something rather than nothing, why the universe exists, why we exist”. — The Grand Design, by Stephen Hawking and Leonard Mlodinow.

Key topics covered in this Special Issue include the following:

  • Black holes;
  • Gravitational waves;
  • Stellar evolution and neutron stars;
  • High-energy astrophysics.

Dr. Mihaela Parvu
Prof. Dr. Ionel Lazanu
Guest Editors

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Keywords

  • cosmology
  • neutron stars
  • black holes
  • astrophysics
  • gravitational waves
  • stellar evolution
  • relativity
  • quantum gravity
  • compact objects
  • high-energy astrophysics

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Published Papers (2 papers)

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Research

19 pages, 319 KiB  
Article
Noncommutative Reissner–Nordström Black Hole from Noncommutative Charged Scalar Field
by Marija Dimitrijević Ćirić, Nikola Konjik, Tajron Jurić, Andjelo Samsarov and Ivica Smolić
Symmetry 2025, 17(1), 54; https://doi.org/10.3390/sym17010054 - 31 Dec 2024
Cited by 1 | Viewed by 738
Abstract
Within the framework of noncommutative (NC) deformation of gauge field theory by the angular twist, we first rederive the NC scalar and gauge field model from our previous papers, and then generalize it to the second order in the Seiberg–Witten (SW) map. It [...] Read more.
Within the framework of noncommutative (NC) deformation of gauge field theory by the angular twist, we first rederive the NC scalar and gauge field model from our previous papers, and then generalize it to the second order in the Seiberg–Witten (SW) map. It turns out that SW expansion is finite and that it ceases at the second order in the deformation parameter, ultimately giving rise to the equation of motion for the scalar field in the Reissner–Nordström (RN) metric that is nonperturbative and exact at the same order. As a further step, we show that the effective metric put forth and constructed in our previous work satisfies the equations of Einstein–Maxwell gravity, but only within the first order of deformation and when the gauge field is fixed by the Coulomb potential of the charged black hole. Thus, the obtained NC deformation of the Reissner–Nordström (RN) metric appears to have an additional off-diagonal element which scales linearly with a deformation parameter. We analyze various properties of this metric. Full article
(This article belongs to the Special Issue Symmetry in Researches of Neutron Stars and Black Holes)
16 pages, 1102 KiB  
Article
Geometric Analysis of Black Hole with Primary Scalar Hair
by Haotian Liu
Symmetry 2024, 16(11), 1505; https://doi.org/10.3390/sym16111505 - 9 Nov 2024
Cited by 1 | Viewed by 600
Abstract
Within the novel context of primary scalar hair black holes, this article explores the fascinating subject of black hole thermal stability. Thermodynamic stability is the main subject of our investigation, which involves measuring the bound points, divergence points, black hole mass, thermal temperature, [...] Read more.
Within the novel context of primary scalar hair black holes, this article explores the fascinating subject of black hole thermal stability. Thermodynamic stability is the main subject of our investigation, which involves measuring the bound points, divergence points, black hole mass, thermal temperature, and specific heat capacity. In addition, we determine the scalar curvatures of thermodynamic geometries like Ruppeiner, Weinhold, Hendi-Panahiyah-Eslam-Momennia, and geometrothermodynamics formulations inside the framework of primary scalar hair black holes and delve into their complexities. Improving our knowledge of fundamental scalar hair black holes, this study sheds light on the intricate thermal geometric properties of these objects. Full article
(This article belongs to the Special Issue Symmetry in Researches of Neutron Stars and Black Holes)
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