Article
Astronomy & Astrophysics
Hai-Shan Liu, H. Lu, Zi-Yu Tang, Bin Wang
Summary: A higher-derivative gravity theory is proposed, as an extension of the Starobinsky model, which introduces new black holes carrying massive scalar hair. These black holes are found to act as walls separating naked spacetime singularities and wormholes, with the entropy and temperature being the same for both the new hairy black hole and the Schwarzschild black hole at the same mass.
Article
Astronomy & Astrophysics
Pavan Kumar Yerra, Chandrasekhar Bhamidipati
Summary: This study investigates the topological classification of critical points of black holes in 4D Einstein-Gauss-Bonnet gravity coupled to Born-Infeld theory. Born-Infeld corrections affect the topological charge of critical points of the charged AdS black hole system independently, while Gauss-Bonnet corrections do not. However, the topological charge of the Einstein-Gauss-Bonnet theory remains unchanged in the presence of Born-Infeld coupling in the combined system.
Article
Astronomy & Astrophysics
Neeraj Kumar, Sunandan Gangopadhyay
Summary: In this study, we investigated the phase transition in black holes with Gauss-Bonnet corrections and Born-Infeld extension, and found that the black hole undergoes a phase transition in a negative cosmological constant background. Through specific heat capacity, free energy, and state space geometry analysis, we demonstrated the second order nature of this phase transition. Non-linearity effects from Born-Infeld electrodynamics were also evident in our analysis.
GENERAL RELATIVITY AND GRAVITATION
(2021)
Article
Physics, Particles & Fields
Aoyun He, Jun Tao, Peng Wang, Yadong Xue, Lingkai Zhang
Summary: In this study, we investigate the shadows of Born-Infeld black holes with magnetic monopoles and Schwarzschild black holes embedded in a uniform Born-Infeld magnetic field. We analyze the effects of nonlinear electromagnetic interactions on the shadow size and the motion of photons in the magnetic field.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Sreejith Nair, Vardarajan Suneeta
Summary: This study investigates the black hole black string phase transition in Einstein-Gauss-Bonnet gravity in the large dimension limit. The results suggest that the geometry at the merger point may not necessarily approach a black hole as the dimensions increase.
Article
Astronomy & Astrophysics
M. Bousder, M. Bennai
Summary: This study investigates the charge of the 4D-Einstein-Gauss-Bonnet black hole by examining the charge of a particle-antiparticle pair at r(-) and r(+) horizons, showing the existence of two types of Schwarzschild black holes and quantified values for the Einstein-Gauss-Bonnet black hole charge. The study also reveals the Hawking-Bekenstein formula with two logarithmic corrections, where the second correction depends on the cosmological constant and the black hole charge. Finally, the thermodynamics of the EGB-AdS black hole is explored.
Article
Astronomy & Astrophysics
Kun Meng, Lianzhen Cao, Jiaqiang Zhao, Tao Zhou, Fuyong Qin, Meihua Deng
Summary: The study presents the action of four-dimensional Horndeski gravity coupled to Born-Infeld electromagnetic fields using the Kaluza-Klein process, and constructs a dyonic black hole solution. The metric of the theory is shown to be singularity-free at the origin, unlike Einstein-Born-Infeld black holes. Thermodynamics of the black hole is investigated, thermodynamic quantities are calculated, and the satisfaction of the first law is confirmed, along with the study of thermodynamic phase transitions in extended phase space.
Article
Astronomy & Astrophysics
M. Zubair, Muhammad Ali Raza
Summary: This paper derives a rotating black hole metric by using the modified Newman-Janis algorithm in the Einstein-Gauss-Bonnet massive gravity. The influence of graviton mass (m) and the Gauss-Bonnet parameter (α) on the horizon and photon sphere radii of rotating and non-rotating black holes is studied. The effects of graviton mass on the effective potential, shadow, distortion, and energy emission rate are investigated using the Hamilton-Jacobi method and Bardeen's procedure of impact parameters. The findings reveal that graviton mass has a significant impact on the shadow and related physical observables. The collision of two uncharged particles near the black hole is also analyzed, and the energy of the particles in the center of mass frame is computed for both static and rotating black hole cases. The shadow diameter is compared with Sgr. A* to obtain constraints on the black hole parameters. ©2023 Elsevier B.V. All rights reserved.
PHYSICS OF THE DARK UNIVERSE
(2023)
Article
Physics, Mathematical
Bhupendra Singh, Benoy Kumar Singh, Dharm Veer Singh
Summary: This study provides the exact solution of the Bardeen black hole in the presence of 4D Gauss-Bonnet massive gravity in Anti-de-Sitter space-time. It modifies the Gauss-Bonnet theory by considering the coupling between gravity and nonlinear matter fields, specifically the electromagnetic field. The obtained solution reveals the existence of 4D EGB Bardeen black holes when the massive gravity parameter is zero and yields a 4D Gauss-Bonnet black hole when there is no magnetic monopole charge. The thermodynamic quantities, such as mass, temperature, and heat capacity, are analyzed in the context of massive gravity and nonlinear electrodynamics, with the additional consideration of the cosmological constant as a thermodynamic variable.
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2023)
Article
Physics, Multidisciplinary
Dharm Veer Singh, Benoy Kumar Singh, Sudhaker Upadhyay
Summary: The study derives an exact black hole solution for Einstein-Gauss-Bonnet gravity with Yang-Mills field in 4D AdS spacetime, and investigates its thermodynamic properties to calculate black hole mass, temperature, entropy, and heat capacity. The presence of Yang-Mills field modifies the thermodynamic quantities, but the entropy remains unaffected by the Yang-Mills charge. The solution exhibits P-v criticality and belongs to the universality class of Van der Waals fluid.
Article
Astronomy & Astrophysics
Chao-Ming Zhang, Ming Zhang, De-Cheng Zou
Summary: This paper studies the Joule-Thomson expansion of Born-Infeld AdS black holes in the consistent Aoki-Gorji-Mukohyama theory of 4D Einstein-Gauss-Bonnet gravity in the extended phase space. The effect of parameters alpha and beta on the inversion curves is further analyzed and the inversion and isenthalpic curves are plotted in the T-P plane to determine the cooling-heating regions.
MODERN PHYSICS LETTERS A
(2022)
Article
Physics, Particles & Fields
Askar Ali, Khalid Saifullah
Summary: A new family of (2+1)-dimensional black holes is investigated in the background of Born-Infeld type theories coupled to a Riemannian curved spacetime. The solutions for both pure magnetic and pure electric sources are derived, and their asymptotic behavior and curvature singularities are discussed. The thermodynamics of these charged black holes is also studied.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Multidisciplinary
Kartheek Hegde, A. Naveena Kumara, C. L. Ahmed Rizwan, Md Sabir Ali, K. M. Ajith
Summary: Modified gravity theories are of great interest in both observational and theoretical studies. In this study, the correlation between the null geodesics and the thermodynamic phase transition of a four-dimensional Gauss-Bonnet AdS black hole is explored. The research shows that the phase transition features can be observed through the functional dependence of photon orbit radius and minimum impact parameter.
Article
Physics, Multidisciplinary
Sudhaker Upadhyay, Dharm Veer Singh
Summary: This study investigates an Einstein-Gauss-Bonnet massive gravity model in 4DAdS spacetime to obtain a black hole solution and analyze its horizon structure. Various types of horizons are found based on the real roots of the metric function. Thermodynamic quantities are derived, confirming the validity of the first law of thermodynamics and the Smarr relation. The presence of the massive gravity parameter affects the thermodynamic quantities and the system's stability is discussed based on heat capacity. When treating the cosmological constant as the thermodynamic pressure, black hole spacetimes exhibit not only standard thermodynamics but also phase structures. The influence of the massive parameter and GB parameter on phase transition is also examined.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Physics, Multidisciplinary
Shao-Wen Wei, Yu-Xiao Liu
Summary: This paper investigates the black hole microstructure near the triple point and the specific properties of the six-dimensional charged Gauss-Bonnet anti-de Sitter black hole. The study reveals a double peak behavior and multiple negatively divergent behaviors, different from the liquid-vapor phase transition. The results also suggest that this black hole system behaves more like argon or methane.
COMMUNICATIONS IN THEORETICAL PHYSICS
(2022)
Article
Astronomy & Astrophysics
J. Sedaghat, S. M. Zebarjad, G. H. Bordbar, B. Eslam Panah
Summary: We have performed a leading order perturbative calculation to obtain the equation of state (EoS) of strange quark matter (SQM) at zero temperature under a magnetic field B = 10(18) G. The obtained EoS is then used to calculate the maximum gravitational mass and corresponding radius of a magnetized strange quark star (SQS). The results show a maximum gravitational mass over three times the solar mass, and the validity of isotropic structure calculations for SQS is investigated.
Article
Physics, Particles & Fields
S. N. Sajadi, S. H. Hendi
Summary: In this study, an analytical approximate rotating black hole solution for quadratic gravity (QG) is obtained by constructing near-horizon and asymptotic solutions and using a continued fraction method. The thermodynamics of the black hole solution is investigated by checking the first law of thermodynamics and the Smarr formula. Various physical properties of the solution, including its photon sphere and shadow, are also investigated.
Article
Physics, Multidisciplinary
B. Eslam Panah
Summary: In this paper, general uncharged accelerating BTZ black hole solutions are extracted and some of their properties are studied. The analysis reveals that the spacetime's asymptotic behavior depends on four parameters: the cosmological constant, mass, acceleration, and topological constant. The temperature of these black holes is found to be always positive for AdS spacetime. Charged accelerating BTZ black hole solutions in the presence of a conformally invariant Maxwell field are also investigated. The findings show a coupling between the electrical charge and other quantities of the accelerating BTZ black holes. The asymptotic behavior and temperature of charged accelerating BTZ black holes are studied, with the temperature depending on the electrical charge, accelerating parameter, and cosmological constant.
FORTSCHRITTE DER PHYSIK-PROGRESS OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
S. H. Hendi, S. Hajkhalili, S. Mahmoudi
Summary: A new model of regular black hole in 2+1 dimensions is proposed by considering an appropriate matter field as the energy-momentum tensor. The model introduces an upper bound on the radius of the event horizon and a lower bound on the mass, motivated by astrophysical black holes. The solutions obtained are investigated for their geometric properties and found to be thermally stable in the mentioned admissible domain.
FORTSCHRITTE DER PHYSIK-PROGRESS OF PHYSICS
(2023)
Article
Astronomy & Astrophysics
S. H. Hendi, Kh Jafarzade, B. Eslam Panah
Summary: The recent observations of M87* by the EHT have sparked interest in studying the shadow of black holes, as well as investigating the time evolution and lifetime of black holes to refine theoretical models in gravitating systems. In this study, we focus on the optical features of a charged AdS black hole in dRGT massive gravity, such as its shadow geometrical shape and energy emission rate, to narrow down the free parameters of the theory. Our main goal is to compare the rotating counterpart of the static black hole solution in dRGT massive gravity with EHT data to determine the allowed regions of the model parameters. Additionally, we analyze how the rotation factor and other parameters impact the emission of particles around the black holes.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Physics, Multidisciplinary
Kh Jafarzade, E. Rezaei, S. H. Hendi
Summary: This article investigates the geometric properties, optical features, and thermodynamic behavior of a class of rotating Lifshitz-like black hole solutions in Horava-Lifshitz gravity. Examinations on the impact of electric charge, angular momentum, and exponents on the optical characteristics and thermodynamics are conducted, including the existence of a van der Waals-like phase transition. A holographic heat engine is also constructed to study the efficiency of the black hole. The second law of thermodynamics is examined by comparing the efficiency of the black hole heat engine with the Carnot heat engine efficiency.
PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS
(2023)
Article
Astronomy & Astrophysics
B. Eslam Panah
Summary: By considering a three-dimensional C-metric and introducing energy dependence, we construct a three-dimensional energy-dependent C-metric. We then obtain accelerating BTZ black hole solutions in gravity's rainbow. Moreover, we find that (A)dS black holes have an event horizon depending on all the parameters of this theory. The temperature and entropy of these black holes are calculated and analyzed, with the heat capacity indicating different behaviors based on the cosmological energy-dependent constant. Finally, we show that accelerating AdS BTZ black holes can satisfy both physical conditions and local stability.
Article
Astronomy & Astrophysics
S. H. Hendi, A. Nemati
Summary: In this paper, the Einstein-massive gravity coupled to the Yang-Mills gauge field in five dimensions is studied. The thermodynamic behavior of the static solutions with planar horizon geometry in the extended phase space is explored, and the validity of the first law of thermodynamics is examined using the Hessian matrix. A van der Waals like phase transition is observed for this kind of solution, despite the planar topology of the boundary. The critical quantities and the effects of the massive and Yang-Mills parameters on them are determined. Additionally, the details of the first order phase transition such as the swallow-tail behavior of the Gibbs free energy and divergencies of the specific heat are discussed.
Article
Physics, Multidisciplinary
B. Eslam Panah, M. Khorasani, J. Sedaghat
Summary: In this article, we investigated the three-dimensional C-metric in the F(R) theory of gravity with and without a matter field, and obtained exact solutions for accelerating black holes. The effects of various parameters on the metric function, roots, and temperature of the black holes were studied. We also considered the coupling of nonlinear electrodynamics as a matter field to obtain charged black hole solutions and evaluated the effects of different parameters on the solutions, roots, and temperature. The results showed a dependency on various parameters, and the temperature of the black holes was positive after a certain root.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Physics, Particles & Fields
B. Eslam Panah, M. E. Rodrigues
Summary: In this paper, exact phantom (A)dS black hole solutions are obtained in the context of F(R) gravity with topological spacetime in four dimensions. The effects of different parameters on the event horizon are studied. The conserved and thermodynamic quantities of the system are calculated, and the first law of thermodynamics for these types of black holes is checked. The local stability of the topological phantom (A)dS black holes in F(R) gravity is evaluated by studying the heat capacity and the geometrothermodynamics, which show agreement. The global stability is investigated using the Gibbs potential and the Helmholtz free energy, and the effects of different parameters on local and global stabilities are highlighted.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
H. Barzegar, M. Bigdeli, G. H. Bordbar, B. Eslam Panah
Summary: In this work, we investigate the properties of three-dimensional AdS gravitational vacuum stars (gravastars) in the framework of gravity's rainbow theory, with the inclusion of the Maxwell electromagnetic field. Our analysis includes the computation of physical parameters and the exploration of stability for charged and uncharged gravastars. The results demonstrate that the physical characteristics of the gravastars are influenced by the rainbow functions and electric field.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
S. N. Sajadi, Ali Hajilou, S. H. Hendi
Summary: In this paper, analytical approximate black hole solutions are derived in the framework of f (R) gravity without a cosmological constant. The equations of motion are applied to a spherically symmetric spacetime with one unknown function, resulting in black hole solutions that are not constrained by the Ricci scalar. Near horizon and asymptotic solutions are obtained and combined using a continued-fraction expansion to yield a complete solution. The stability of the solutions is then investigated through the use of thermodynamics and quasi-normal modes.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
A. Bagheri Tudeshki, G. H. Bordbar, B. Eslam Panah
Summary: Investigating the presence of massive gravitons in the field of massive gravity is crucial for understanding the structure of compact objects. In this study, we used numerical methods to calculate the properties of dark energy stars and found that their maximum mass and radius depend on the free parameters and anisotropy parameter of massive gravity.
PHYSICS OF THE DARK UNIVERSE
(2023)
Article
Astronomy & Astrophysics
H. Barzegar, B. Eslam Panah, G. H. Bordbar, M. Bigdeli
Summary: This paper investigates a new model of (2 + 1)-dimensional gravitational vacuum stars with an isotropic matter distribution anti-de Sitter spacetime in the context of massive gravity. By exploring free singularity models with a specific equation of state and using Mazur-Mottola's approach, the paper predicts 3D gravastars as alternatives to BTZ black holes in massive gravity. Analytical solutions to the interior of gravastars that are free of singularities and event horizons are found. The length, energy, and entropy of a thin shell containing an ultra-relativistic stiff fluid are discussed. The parameter of massive gravity plays a significant role in predicting the proper length, energy contents, entropy, and parameters of gravastars.