Article
Astronomy & Astrophysics
Pablo A. Cano, Angel Murcia
Summary: The study presents a non-minimal higher-derivative extension of Einstein-Maxwell theory, where electrically-charged black holes and point charges exhibit globally regular gravitational and electromagnetic fields. An exact static, spherically symmetric solution is provided to regulate the singularity at r = 0 for arbitrary mass and non-vanishing charge, while reducing to the Reissner-Nordstrom solution at weak coupling. The discussion focuses on the properties of these solutions and the physical significance of the results.
CLASSICAL AND QUANTUM GRAVITY
(2021)
Article
Astronomy & Astrophysics
Roberto Casadio, Andrea Giusti, Jorge Ovalle
Summary: We propose a quantum description of electrically charged spherically symmetric black holes using coherent states of gravitons, which resolves the issue of both the central singularity and the Cauchy horizon.
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
Astronomy & Astrophysics
Christiane Klein, Jochen Zahn
Summary: The Hadamard point-split renormalization of the current density of a charged scalar field in a Reissner-Nordstrom-de Sitter spacetime was performed, with numerical computations of the expectation values in the Unruh state in the exterior region. The study examined the dependence on field parameters and position.
Article
Physics, Particles & Fields
Ruben Campos Delgado
Summary: Starting from an effective action for quantum gravity, the quantum gravitational corrections to the Wald entropy of a non-extremal Reissner-Nordstrom black hole in the limit of small electric charge are calculated. The classical position of the event horizon of the RN metric is shifted due to quantum corrections at second order in the Ricci curvature. The quantum gravitational corrections to the temperature and the pressure of the black hole are computed by applying the Wald entropy formula.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Multidisciplinary
Joaquin Estevez-Delgado, Gabino Estevez-Delgado
Summary: A simple and static spherically symmetrical geometry is proposed to model a fluid sphere in order to describe the interior of stellar objects, whether neutral or charged. The stability of the solutions in both cases is demonstrated, with density and radial pressure behaving as monotonic decreasing functions. The models depend on parameters such as compactness rate and speed of sound behavior in the neutral case, and compactness rate and charge-to-radius ratio in the charged case.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Physics, Particles & Fields
Nozima Juraeva, Javlon Rayimbaev, Ahmadjon Abdujabbarov, Bobomurat Ahmedov, Satimbay Palvanov
Summary: The study investigates the dynamics of magnetized particles around magnetically and electrically Reissner-Nordstrom black holes by using a magnetized neutron star as a test particle. It shows that the magnetic charge of the black hole can mimic the spin parameter of a rotating Kerr black hole, and the external magnetic field can mimic the magnetic charge of the black hole. The electric charge of the black hole can also mimic the magnetic charge, and the magnetic field interaction with the magnetized particle affects the mimicking value of the black hole spin parameter.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
Gustavo Garcia, Marcelo Salgado
Summary: This work reanalyzes the possibility of finding bound states of a charged and complex-valued scalar field in the background of a Reissner-Nordstrom black hole, with numerical evidence and a theorem. It shows that under certain conditions such clouds do not exist, but with the inclusion of a self-interacting potential, there may be charged clouds present.
Article
Astronomy & Astrophysics
Ying Wang, Wei Sun, Fuyao Liu, Xin Wu
Summary: This study explored the possibility of constructing explicit symplectic integrators for a Hamiltonian of charged particles moving around a Reissner-Nordstrom black hole with an external magnetic field. The proposed algorithms showed desirable properties in their long-term stability, precision, and efficiency for appropriate choices of step size. Effects of black hole's charge, Coulomb part of electromagnetic potential, and magnetic parameter on the dynamical behavior were investigated.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
M. Dehghani
Summary: This study introduces two novel classes of nonlinearly charged black hole solutions that are coupled to logarithmic and exponential theories of nonlinear electrodynamics in the context of massive gravity theory. The study calculates the thermodynamic and conserved quantities of the black holes and investigates their thermal stability and global stability. By comparing the results obtained from different methods and considering the thermodynamic pressure, the critical behavior of the black holes in the extended phase space is also studied.
Article
Astronomy & Astrophysics
Run-Dong Zhao, Jia-Hui Huang
Summary: The superradiant stability of higher dimensional non-extremal Reissner-Nordstrom black hole under charged massive scalar perturbation is analytically studied. It is found that there is no potential well outside the outer horizon of the black hole for the superradiant scalar modes, indicating the absence of a black hole bomb and the superradiant stability of the system.
Article
Physics, Multidisciplinary
Bobur Turimov, Madina Boboqambarova, Bobomurat Ahmedov, Zdenek Stuchlik
Summary: This paper explores the differences between electrically and magnetically charged Reissner-Nordstrom black holes by studying the motion of test particles, fundamental frequencies of charged particles, and synchrotron radiation by accelerated charged particles around the black hole.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Physics, Particles & Fields
Marco Astorino, Adriano Vigano
Summary: In this paper, we study multi-black hole systems immersed in external gravitational field configurations in four-dimensional General Relativity. By using an infinite multipolar expansion, the conical singularities of a series of collinear static black holes are regularized. We also achieve a stationary rotating black hole system by adding independent angular momenta and NUT parameters to each source of the binary configuration. Furthermore, a charged extension of the binary black hole system at equilibrium is generated. Lastly, we demonstrate the consistent recovery of the binary Majumdar-Papapetrou solution in the vanishing external field limit.
EUROPEAN PHYSICAL JOURNAL C
(2022)
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
Physics, Particles & Fields
Asifa Ashraf, Abdelghani Errehymy, Allah Ditta, Zhiyue Zhang, Xia Tiecheng, Mohammed Daoud
Summary: In this paper, an anisotropic solution for compact stellar configurations is constructed under the influence of Rastall Teleparallel gravity, using the observed mass and radius of compact stars from the literature. The study employs the embedding class one spacetime paradigm with Karmarkar's condition to investigate the crucial elements of spherically symmetric metric space. The model, which is physically viable and supports the emergence of novel realistic stellar configurations, is validated through comparison with three specific compact stars.
EUROPEAN PHYSICAL JOURNAL C
(2023)