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Selected Papers from "International Conference on Gravitation, Astrophysics, and Cosmology...
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Selected Papers from "International Conference on Gravitation, Astrophysics, and Cosmology (ICGAC-2024)": Theory Confronts Observation — A Cosmic Scenario

A special issue of Particles (ISSN 2571-712X).

Deadline for manuscript submissions: 31 January 2025 | Viewed by 3599

Special Issue Editor

Prof. Dr. Saibal Ray

E-Mail Website
Guest Editor
Centre for Cosmology, Astrophysics and Space Science (CCASS), GLA University, Mathura 281406, India
Interests: general relativity; compact stars; symmetries; wormholes; modified theories of gravity; cosmology
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The International Conference on Gravitation, Astrophysics and Cosmology (ICGAC-2024, https://www.gla.ac.in/icgac/) aims to bring together leading academics, scientists, researchers and scholars to share and exchange their experiences, research findings and results. It provides a premier platform for researchers to share, discuss and present their research results on the most recent innovations, trends and concerns as well as practical challenges in all aspects of gravitation, astrophysics and cosmology of several observational explorations.

Under this purview, we are publishing a Special Issue of the journal Particles entitled "Theory Confronts Observation — A Cosmic Scenario". This Special Issue will comprise selected papers following the peer-review processes according to the norm and policy of the journal.

Prof. Dr. Saibal Ray
Guest Editor

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. Particles is an international peer-reviewed open access quarterly 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 1600 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

  • general relativity
  • modified gravity
  • differential geometry
  • astronomy
  • astrophysics
  • cosmology

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Published Papers (5 papers)

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Research

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21 pages, 571 KiB  
Article
Hayward–Letelier Black Holes in AdS Spacetime
by Arun Kumar, Ashima Sood, Sushant Ghoshtokumar Ghosh and Aroonkumar Beesham
Particles 2024, 7(4), 1017-1037; https://doi.org/10.3390/particles7040062 - 20 Nov 2024
Viewed by 356
Abstract
We analyze Hayward black holes (BHs) with a negative cosmological constant surrounded by a cloud of strings, which we designate Hayward–Letelier AdS BHs. These solutions can be obtained by coupling the Einstein equations with nonlinear electrodynamics and the energy–momentum tensor of clouds of [...] Read more.
We analyze Hayward black holes (BHs) with a negative cosmological constant surrounded by a cloud of strings, which we designate Hayward–Letelier AdS BHs. These solutions can be obtained by coupling the Einstein equations with nonlinear electrodynamics and the energy–momentum tensor of clouds of strings. We show that these solutions are no longer regular and have a curvature singularity at the center. In turn, we analyze the thermodynamics associated with these BHs by establishing the form of the Smarr formula and the first law of thermodynamics. We derive the expressions for the thermodynamic quantities such as pressure, temperature, heat capacity, Gibbs free energy, and isothermal compressibility. We explore the phase structure of these solutions by analyzing the behavior of the heat capacity and Gibbs free energy. These solutions exhibit a first-order phase transition, similar to van der Waals fluids. We also check the behavior of the thermodynamic quantities near the critical points and calculate the values of the critical exponents. This illustrates a robust analogy between our solutions and van der Waals fluids. Full article
(This article belongs to the Special Issue Selected Papers from "International Conference on Gravitation, Astrophysics, and Cosmology (ICGAC-2024)": Theory Confronts Observation — A Cosmic Scenario)
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16 pages, 508 KiB  
Article
A Probe into the Evolution of Primordial Perturbations in the f(T) Gravity Framework with Chaplygin Gas
by Sanjeeda Sultana, Surajit Chattopadhyay and Antonio Pasqua
Particles 2024, 7(4), 939-954; https://doi.org/10.3390/particles7040057 - 31 Oct 2024
Viewed by 402
Abstract
This work is focused on studying the cosmology of variable modified Chaplygin gas (VMCG) in the framework of exponential and logarithmic f(T) theory. The equation of state (EoS) for VMCG in exponential and logarithmic f(T) gravity shows [...] Read more.
This work is focused on studying the cosmology of variable modified Chaplygin gas (VMCG) in the framework of exponential and logarithmic f(T) theory. The equation of state (EoS) for VMCG in exponential and logarithmic f(T) gravity shows quintom behavior. Primordial perturbations were studied for VMCG in both exponential and logarithmic f(T) gravity, and it was observed that the potential increases with cosmic time t, and the scalar field decreases toward the minimum value of the potential. The squared speed of sound was positive, meaning that VMCG in both exponential and logarithmic f(T) gravity shows stability against small gravitational perturbations. Full article
(This article belongs to the Special Issue Selected Papers from "International Conference on Gravitation, Astrophysics, and Cosmology (ICGAC-2024)": Theory Confronts Observation — A Cosmic Scenario)
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23 pages, 1167 KiB  
Article
Cosmological Models within f(T, B) Gravity in a Holographic Framework
by Khandro K. Chokyi and Surajit Chattopadhyay
Particles 2024, 7(3), 856-878; https://doi.org/10.3390/particles7030051 - 22 Sep 2024
Viewed by 675
Abstract
We investigate the cosmological evolution of the universe for a spatially flat FLRW background space within the context of f(T,B) gravity, which is a recently formulated teleparallel theory that connects both f(T) and [...] Read more.
We investigate the cosmological evolution of the universe for a spatially flat FLRW background space within the context of f(T,B) gravity, which is a recently formulated teleparallel theory that connects both f(T) and f(R) gravity under suitable limits. The analysis focuses on four different f(T,B) cosmological models corresponding to various choices of scale factor, namely, emergent, logamediate, and intermediate. In addition to this, we assume a power law-like function of f(T,B) gravity. The reconstruction of f(T,B) gravity considers the Holographic Ricci Dark Energy (HRDE) as the background fluid. We analyze the equation of state parameters and the squared speed of sound for the reconstructed models. Finally, we conduct a thermodynamical analysis for each reconstructed model. The generalized second law of thermodynamics (GSLT) is valid for the four different f(T,B) cosmological models. Full article
(This article belongs to the Special Issue Selected Papers from "International Conference on Gravitation, Astrophysics, and Cosmology (ICGAC-2024)": Theory Confronts Observation — A Cosmic Scenario)
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21 pages, 2120 KiB  
Article
Generalized Finslerian Wormhole Models in f(R,T) Gravity
by B. R. Yashwanth, S. K. Narasimhamurthy and Z. Nekouee
Particles 2024, 7(3), 747-767; https://doi.org/10.3390/particles7030043 - 20 Aug 2024
Cited by 2 | Viewed by 702
Abstract
This article explores wormhole solutions within the framework of Finsler geometry and the modified gravity theory. Modifications in gravitational theories, such as f(R,T) gravity, propose alternatives that potentially avoid the exotic requirements. We derive the field equations from [...] Read more.
This article explores wormhole solutions within the framework of Finsler geometry and the modified gravity theory. Modifications in gravitational theories, such as f(R,T) gravity, propose alternatives that potentially avoid the exotic requirements. We derive the field equations from examining the conditions for Finslerian wormhole existence and investigate geometrical and material characteristics of static wormholes using a polynomial shape function in Finslerian space–time. Furthermore, we address energy condition violations for different Finsler parameters graphically. We conclude that the proposed models, which assume a constant redshift function, satisfy the necessary geometric constraints and energy condition violations indicating the presence of exotic matter at the wormhole throat. We also discuss the anisotropy factors of the wormhole models. The results are validated through analytical solutions and 3-D visualizations, contributing to the broader understanding of wormholes in Finsler-modified gravity contexts. Full article
(This article belongs to the Special Issue Selected Papers from "International Conference on Gravitation, Astrophysics, and Cosmology (ICGAC-2024)": Theory Confronts Observation — A Cosmic Scenario)
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Review

Jump to: Research

19 pages, 1025 KiB  
Review
Some Singular Spacetimes and Their Possible Alternatives
by Andrew DeBenedictis
Particles 2024, 7(4), 899-917; https://doi.org/10.3390/particles7040054 - 14 Oct 2024
Viewed by 668
Abstract
In this review, we begin with a historical survey of some singular solutions in the theory of gravitation, as well as a very brief discussion of how black holes could physically form. Some possible scenarios which could perhaps eliminate these singularities are then [...] Read more.
In this review, we begin with a historical survey of some singular solutions in the theory of gravitation, as well as a very brief discussion of how black holes could physically form. Some possible scenarios which could perhaps eliminate these singularities are then reviewed and discussed. Due to the vastness of the field, its coverage is not exhaustive; instead, the concentration is on a small subset of topics such as possible quantum gravity effects, non-commutative geometry, and gravastars. A simple singularity theorem is also reviewed. Although parts of the manuscript assume some familiarity with relativistic gravitation or differential geometry, the aim is for the broad picture to be accessible to non-specialists of other physical sciences and mathematics. Full article
(This article belongs to the Special Issue Selected Papers from "International Conference on Gravitation, Astrophysics, and Cosmology (ICGAC-2024)": Theory Confronts Observation — A Cosmic Scenario)
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