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Article
Physics, Multidisciplinary
Grigoris Panotopoulos et al.
Summary: This article investigates the possibility of compact charged spheres made of a charged perfect fluid in the context of the 4D Einstein-Gauss-Bonnet (EGB) gravity theory. By rescaling the Gauss-Bonnet (GB) coupling constant and redefining gravity in 4D, the GB term contributes to the gravitational dynamics. The analysis is based on a polytropic equation of state and a proportional relation between charge density and energy density. The article derives hydrostatic equilibrium equations and solves them numerically to obtain mass-radius relations for charged compact stars. It also explores the relationship between mass and central mass density, as well as the relation between electric charge and maximum mass of compact stars in this gravity theory. The article concludes that charged stars may exist in nature and their deviation from traditional models may be observable in future astrophysical probes.
CHINESE JOURNAL OF PHYSICS
(2022)
Article
Astronomy & Astrophysics
Fazlay Ahmed et al.
Summary: Higher-dimensional theories suggest that supermassive black holes have different optical properties compared to standard ones, and their shadows can be used to determine the consistency of gravity theories. Researchers present an exact five-dimensional rotating regular black hole metric that provides insights into the nature of black holes and the existence of extra dimensions.
GENERAL RELATIVITY AND GRAVITATION
(2022)
Article
Physics, Particles & Fields
Juan M. Z. Pretel et al.
Summary: In this work, we investigated the properties of compact spheres made of a charged perfect fluid with the MIT bag model equation of state for quark matter. By considering a static spherically symmetric spacetime, we derived the hydrostatic equilibrium equations in the recently developed four-dimensional Einstein-Gauss-Bonnet gravity theory. We numerically solved the modified TOV equations to study the impact of electric charge on the stellar structure.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Nuclear
Dharm Veer Singh et al.
Summary: In this study, a singular solution is derived for the rotating counterpart of Lee-Wick gravity with a point source in a higher-derivative theory. The thermodynamics of this thermal system, including mass parameters, angular velocity, and Hawking temperature, is critically analyzed. The first law of thermodynamics is found to be valid, and the expression of entropy is obtained. The stability and phase transition of the theory are further discussed by evaluating heat capacity and free energy, revealing that the stability of the black hole is dependent on the horizon radius.
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2022)
Article
Physics, Multidisciplinary
Sudhaker Upadhyay et al.
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, Particles & Fields
Dharm Veer Singh et al.
Summary: We demonstrate that regular black holes, as proposed by Culetu [14], can be achieved by coupling Einstein's gravity with nonlinear electrodynamics source. These non-singular black holes exhibit various characteristics depending on the mass parameter.
Article
Physics, Multidisciplinary
Dharm Veer Singh et al.
Summary: In this study, an exact black hole solution is constructed for the Einstein gravity coupled with nonlinear electrodynamics in the presence of a cloud of strings as the source. The thermodynamical properties of the black hole solutions are investigated, and a corrected first-law of thermodynamics is derived. The presence of the cloud of strings does not affect the stability of the black hole, but a second-order phase transition exists at a critical horizon radius.
Article
Physics, Multidisciplinary
Dharm Veer Singh et al.
Summary: In this study, an exact solution for the AdS black hole solution in Einstein-Gauss-Bonnet gravity coupled with nonlinear electrodynamics has been obtained. The thermodynamic properties of the obtained solution, including mass, temperature, entropy, heat capacity, and free energy, are investigated based on horizon thermodynamics. It is found that smaller nonsingular black holes are stable due to positive heat capacity and negative free energy. The relations between the black hole shadow and the critical behavior of charged EGB AdS regular black hole in the extended phase space are explicitly traced.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Physics, Multidisciplinary
Sushant G. Ghosh et al.
Summary: The study involved analyzing black holes with AdS asymptotic of regularized 4D EGB gravity coupled to the nonlinear electrodynamics (NED) field, resulting in the introduction of new solutions and modifications to thermodynamic quantities that do not follow the usual rules. Additionally, a secondary Hawking-Page transition between smaller black holes and thermal AdS space was observed. Furthermore, it was noted that Hawking's evaporation stops abruptly at shorter radii ranges, leaving behind a thermodynamically stable remnant with zero temperature.
Article
Astronomy & Astrophysics
Takol Tangphati et al.
Summary: Recent progress in determining the masses and radii of neutron stars has led to strong constraints on the equation of state (EoS) above nuclear saturation density. A proposed anisotropic star model within Einstein-Gauss-Bonnet gravity theory suggests the possibility of obtaining maximal neutron star mass and supports the existence of other massive pulsars with common radii. The study also discusses the mass vs central mass density relation and stability characteristics in this gravity theory.
Article
Astronomy & Astrophysics
Takol Tangphati et al.
Summary: The current trend in dense matter physics at high densities and low temperatures focuses on the behavior of a degenerate Fermi gas of quarks forming Cooper pairs, known as a color superconductor, in compact objects. The study explores the anisotropy of quark stars (QSs) and their maximum mass-radius relation in the context of 4D Einstein-Gauss-Bonnet (EGB) gravity, considering the effects of Gauss-Bonnet (GB) coupling constant on the mass-radius relation and mass-central mass density relation of QSs. The research also examines the influence of anisotropy on the equilibrium and stability of strange stars, as well as other properties of QSs related to compactness and binding energy, providing evidence for super-massive pulsars in 4D EGB gravity.
PHYSICS OF THE DARK UNIVERSE
(2021)
Article
Physics, Multidisciplinary
Benoy Kumar Singh et al.
Summary: This paper investigates the Ayon-Beato Garcia black hole in AdS spacetime and computes thermodynamic quantities in extended phase space based on different charge-to-mass ratios, observing first- and second-order phase transitions. The study also explores the equation of state and critical exponents for black holes, finding similarities with Van der Waals fluid behavior.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Physics, Multidisciplinary
Dharm Veer Singh et al.
Article
Physics, Multidisciplinary
Drazen Glavan et al.
PHYSICAL REVIEW LETTERS
(2020)
Article
Astronomy & Astrophysics
Dharm Veer Singh et al.
Article
Physics, Multidisciplinary
Benoy Kumar Singh et al.
EUROPEAN PHYSICAL JOURNAL PLUS
(2020)
Article
Physics, Particles & Fields
Arun Kumar et al.
EUROPEAN PHYSICAL JOURNAL C
(2019)
Article
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Athanasios G. Tzikas
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Astronomy & Astrophysics
Dharm Veer Singh et al.
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
(2018)
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Sushant G. Ghosh et al.
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Astronomy & Astrophysics
Pankaj Chaturvedi et al.
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
(2017)
Article
Astronomy & Astrophysics
Sharmanthie Fernando
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
(2017)
Article
Physics, Multidisciplinary
Dharm Veer Singh et al.
Article
Physics, Particles & Fields
Sushant G. Ghosh et al.
EUROPEAN PHYSICAL JOURNAL C
(2015)
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Astronomy & Astrophysics
Rong-Gen Cai et al.
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Meng-Sen Ma et al.
CLASSICAL AND QUANTUM GRAVITY
(2014)
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Leonardo Balart et al.
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Leonardo Balart et al.
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J. C. S. Neves et al.
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Li Xiang et al.
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
(2013)
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Cosimo Bambi et al.
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Jose P. S. Lemos et al.
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Oleg B. Zaslavskii
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GENERAL RELATIVITY AND GRAVITATION
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KA Bronnikov
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