Article
Materials Science, Multidisciplinary
Israr Ali Khan, Amir Sultan Khan, Saeed Islam, Shah Qasim Jan, Kottakkaran Sooppy Nisar, Muhammad Uzair Shah
Summary: This article investigates the dynamics of neutral and charged particles in a magnetic field around a Reissner-Nordstrom black hole surrounded by quintessence, considering Noether symmetries and conservation laws in the corresponding spacetime. The study explores the effects of angular momentum, quintessence parameter, and magnetic field on the particles' dynamics, and also examines the orbit stability of the spacetime using the Lyapunov exponent.
RESULTS IN PHYSICS
(2021)
Article
Astronomy & Astrophysics
Haryanto M. Siahaan
Summary: This study investigates the pair production near a (near) extremal magnetized Reissner-Nordstrom black hole. The results show the existence of pair production in the extremal state, which can be interpreted as the Schwinger effect due to the strong field under consideration. Numerical examples are provided to demonstrate the correspondence between the growth of the external magnetic field and scalar absorption.
Article
Astronomy & Astrophysics
Libo Xie, Chaoxi Fang, Jie Jiang, Ming Zhang
Summary: In this study, we analytically investigate the scalarization of higher-dimensional charged Reissner-Nordstrom black hole. It is found that a static massive scalar field, which is non-minimally coupled to the Gauss-Bonnet invariant, can be supported by the higher-dimensional black hole in the super-critical charge regime. Moreover, we demonstrate that the static massive scalar shell can be incredibly thin in the large mass regime.
Article
Physics, Multidisciplinary
Wen-Bin Feng, Si-Jiang Yang, Qin Tan, Jie Yang, Yu-Xiao Liu
Summary: Research suggests that overcharging a charged Taub-NUT regular black hole is possible through the scattering of a charged field and absorption of a charged particle. Both near-extremal and extremal black holes cannot be overcharged through charged scalar field scattering. While the event horizon of a near-extremal charged Taub-NUT regular black hole may be destroyed by absorption of a charged particle, it may not be overcharged if charge and energy cross the event horizon in a continuous path.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2021)
Article
Astronomy & Astrophysics
Sanjar Shaymatov, Bakhtiyor Narzilloev, Ahmadjon Abdujabbarov, Cosimo Bambi
Summary: The study investigates the dynamics of neutral and charged test particles around axially symmetric magnetized black hole spacetime, showing that the combined effects of black hole electric charge and magnetic field strongly affect the innermost stable circular orbit radius. The repulsive (attractive) Coulomb force dominates over the Lorentz force from the black hole magnetic field, and increases in black hole magnetic field and electric charge lead to high center of mass energy extracted by the collision of particles. Ultimately, the presence of magnetic field in a magnetized black hole solution results in axially symmetric spacetime.
Article
Physics, Nuclear
Surajit Mandal, Sudhaker Upadhyay, Yerlan Myrzakulov, Gulmira Yergaliyeva
Summary: In this paper, the authors discuss the shadow cast by the charged Reissner-Nordstrom (RN) anti-de Sitter (AdS) black hole. They calculate the geodesic equations for null particles using the Killing equation and Hamilton-Jacobi equation, and determine the celestial coordinates and shadow radius of the RN AdS black hole. The authors present a graphical analysis of the black hole shadow, showing it to be a perfectly dark circle. They also investigate the effects of charge, cosmological constant, and plasma medium on the shadow radius and energy emission rate of the RN AdS black hole.
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2023)
Article
Physics, Nuclear
Jun Zhang, Yi-Yu Lin, Hao-Chun Liang, Ke-Jia Chi, Chiang-Mei Chen, Sang Pyo Kim, Jia-Rui Sun
Summary: The study investigates the pair production of charged scalar particles in a near extremal RN-AdS(5) black hole, revealing a concise relation between pair production rate and absorption cross section ratio in the full spacetime and near horizon region. The holographic descriptions of pair production in the IR CFT and UV CFT are analyzed using AdS(2)/CFT1 and AdS(5)/CFT4 correspondences, providing a complete description of scalar pair production in a near extremal RN-AdS(5) black hole.
Article
Physics, Particles & Fields
Jing Zhang, Yi Xie
Summary: The precessing and periodic orbits of a test timelike particle around the black-bounce-Reissner-Nordstrom spacetime, characterized by its charge and bounce parameter, are investigated. The exact forms of its marginally bound orbit and innermost stable circular orbit are obtained. Attention is given to the precessing orbits and the resulting relativistic periastron advance is found. The study also looks at the periodic orbits and shows that small variations in the charge and bounce parameter can cause the motion to switch between periodic and precessing orbits. A distinct degeneracy is found in these two types of orbits, where specific combinations of the charge and bounce parameters can generate the exact same orbital motion in the black-bounce-Reissner-Nordstrom spacetime, mimicking that of the Schwarzschild black hole. To break this degeneracy, GRAVITY's observation of the precession of S2 star around Sgr A* and the shadow diameter measurements of Sgr A* by the Event Horizon Telescope are used to provide preliminary bounds on the charge and bounce parameter.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Multidisciplinary
M. Atiqur Rahman
Summary: The Hawking temperature and Entropy of Reissner-Nordstrom (RN) black hole can be derived from energy quantization of test particles moving around different circular orbits, similar to Bohr's atomic model. Energy transitions may lead to detectable radiations in the future. By using gravitoelectromagnetism, it is possible to split the upper bound of energy without considering the quantization effects on energy level splitting, due to the hypothetical nature of gravitipole.
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
(2021)
Article
Astronomy & Astrophysics
Hao Chen, Bekir Can Lutfuoglu, Hassan Hassanabadi, Zheng-Wen Long
Summary: In this paper, the quantum correction on the thermodynamics of the Reissner-Nordstrom black hole in the presence of quintessence matter associated with dark energy is investigated. The modified Hawking temperature, heat capacity, and entropy functions of the black hole are derived. It is found that the modified uncertainty principles and normalization factor have significant effects on the thermodynamic properties of the black hole, and graphical methods are used to compare the findings within different uncertainty principles.
Article
Astronomy & Astrophysics
J. P. Morais Graca, Eduardo Folco Capossoli, Henrique Boschi-Filho, Iarley P. Lobo
Summary: In this work, the inversion temperature associated with the Joule-Thomson expansion from the thermodynamics of AdS-Reissner-Nordstrom black holes is studied. Quantum corrections are included in a cosmological fluid that can describe phantom dark matter or quintessence, both in a Kiselev scenario. Numerical solutions are used to describe the physical systems, and the results are presented in temperature-pressure plots for different parameter values. Nonzero minimum inversion temperatures and pressures are found depending on the values of the parameters. Isenthalpic curves associated with black hole fixed mass processes are also discovered.
Article
Multidisciplinary Sciences
Wajiha Javed, Mehak Atique, Reggie C. Pantig, Ali Ovgun
Summary: In this study, we investigated the weak lensing effects of a Reissner-Nordstrom black hole corrected by a bounce parameter in plasma and dark matter mediums. Using optical geometry and the Gibbons-Werner approach, we found that these mediums increase the bending angle of the black hole. Additionally, we examined the impact of the bounce parameter on the deflection angle of light and computed the Hawking radiation using a topological method.
Article
Astronomy & Astrophysics
Joao Paulo Cavalcante, Bruno Carneiro da Cunha
Summary: The study investigates spin perturbations for nonextremal and extremal Reissner-Nordstrom backgrounds using the isomonodromic method. By calculating the fundamental quasinormal modes associated with each perturbation, the study reveals the existence of nondamping modes for qQ above a spin-dependent critical value and determines the bifurcation point in the q - Q parameter space.
Article
Astronomy & Astrophysics
Sanjar Shaymatov, Pankaj Sheoran, Ricardo Becerril, Ulises Nucamendi, Bobomurat Ahmedov
Summary: In this paper, the Penrose process in the vicinity of the axially symmetric magnetized Reissner-Nordstrom black hole is investigated for neutral and charged particles. It is found that there are regions where the g(tt) component of the metric tensor is positive, not only close to the event horizon but also far away in the potential wells. The effect of the magnetic field on the efficiency of the Penrose process for the axially symmetric magnetized black hole case is also examined, and compared with the case of a Kerr black hole.
Article
Astronomy & Astrophysics
M. Blagojevic, B. Cvetkovic
Summary: In Poincare gauge theory, black hole entropy is canonically defined by the variation of a boundary term Gamma(H) located at the horizon. For a new member of the same class, the Reissner-Nordstrom-like black hole with torsion, the variation of Gamma(H) is affected by a gravitational parameter induced by the existence of torsion, ensuring the validity of the first law.
Article
Astronomy & Astrophysics
Nelson R. F. Braga, Octavio C. Junqueira
Summary: This study investigates the influence of rotation on the transition temperature of strongly interacting matter produced in non-central heavy ion collisions. By using a holographic description of an AdS black hole, the authors extend the analysis to the more realistic case where the matter spreads over a region around the rotational axis. The results show the coexistence of confined and deconfined phases and are consistent with the concept of local temperature in rotating frames developed by Tolman and Ehrenfest.
Article
Astronomy & Astrophysics
Bing Sun, Jiachen An, Zhoujian Cao
Summary: This paper investigates the effect of gravitational constant variation on the propagation of gravitational waves. By employing two analytical methods, the study finds that variations in the gravitational constant result in amplitude and phase corrections for gravitational waves, and the time variation of the gravitational constant can be constrained through the propagation of gravitational waves.
Article
Astronomy & Astrophysics
Abdellah Touati, Zaim Slimane
Summary: This letter presents the first study of Hawking radiation as a tunneling process within the framework of non-commutative gauge theory of gravity. The non-commutative Schwarzschild black hole is reconstructed using the Seiberg-Witten map and the star product. The emission spectrum of outgoing massless particles is computed using the quantum tunneling mechanism. The results reveal pure thermal radiation in the low-frequency scenario, but a deviation from pure thermal radiation in the high-frequency scenario due to energy conservation. It is also found that noncommutativity enhances the correlations between successively emitted particles.
Article
Astronomy & Astrophysics
Shahar Hod
Summary: The travel times of light signals between two antipodal points on a compact star's surface are calculated for two different trajectories. It is shown that, for highly dense stars, the longer trajectory along the surface may have a shorter travel time as measured by asymptotic observers. A critical value of the dimensionless density-area parameter is determined for constant density stars to distinguish cases where crossing through the star's center or following a semi-circular trajectory on the surface has a shorter travel time as measured by asymptotic observers.