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
R. D. B. Fontana, P. A. Gonzalez, Eleftherios Papantonopoulos, Yerko Vasquez
Summary: The anomalous decay rate behavior of scalar field perturbations in charged spacetimes shows a critical scalar field mass in photon sphere modes. The dominant mode/family for massless and massive scalar fields in these geometries depends on black hole mass and charge. The critical mass value increases with raising black hole charge, with a minimum in the Schwarzschild limit.
Article
Physics, Particles & Fields
Jing Zhang, Yi Xie
Summary: We investigate the weak and strong deflection gravitational lensing by a black-bounce-Reissner-Nordstrom spacetime and compare it with other spacetimes. We find that distinguishing these spacetimes may be possible by measuring the fluxes difference of the lensed images.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Julio Arrechea, Carlos Barcelo, Raul Carballo-Rubio, Luis J. Garay
Summary: The study focuses on the renormalized stress-energy tensor and backreaction of a massless scalar field on the classical Reissner-Nordstrom spacetime. Different geometries are observed depending on the charge-to-mass ratio, including singularities, wormhole necks, and naked singularities. The resulting horizon from the semiclassical backreaction is shown to be singular despite the finite RSET over the extremal horizon.
CLASSICAL AND QUANTUM GRAVITY
(2021)
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, Particles & Fields
Xuanhua Wang, Ran Li, Jin Wang
Summary: By applying the quantum extremal surface construction, we calculated the Page curve for eternal Reissner-Nordstrom black holes, ignoring backreaction and the greybody factor. The inclusion of islands outside the horizon of the black hole results in the entanglement entropy of Hawking radiation reproducing the Bekenstein-Hawking entropy with an additional term representing the effect of matter fields, helping to address the black hole information paradox.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Mathematical
Dejan Gajic, Claude Warnick
Summary: A new framework is proposed to characterize quasinormal modes or resonant states for the wave equation on asymptotically flat spacetimes, focusing on extremal Reissner-Nordstrom black holes. Quasinormal modes are interpreted as honest eigenfunctions of time translation generators on Hilbert spaces of initial data. The main difficulty in the asymptotically flat setting is the unsuitability of L-2-based Sobolev spaces as suitable Hilbert space choices, leading to the consideration of Hilbert spaces of Gevrey regular functions at infinity and the event horizon.
COMMUNICATIONS IN MATHEMATICAL PHYSICS
(2021)
Article
Astronomy & Astrophysics
Bo Yang, Chunhua Jiang, Wenbin Lin
Summary: In this study, we derive the second post-Newtonian solution for the quasi-Keplerian motion of a charged test particle in the Reissner-Nordstrom spacetime under harmonic coordinates. The solution is formulated in terms of the test particle's orbital energy and angular momentum, which are both constants at the second post-Newtonian order. We explicitly display the effects of charge on the test particle's motion, including the orbital period and perihelion precession. Our results can be applied to cases where the test particle has a small charge-to-mass ratio or the multiplication of the test particle and the gravitational source's charge-to-mass ratios is much smaller than 1.
Article
Astronomy & Astrophysics
Sean E. Li, Thomas W. Baumgarte, Kenneth A. Dennison, H. P. de Oliveira
Summary: Motivated by recent numerical relativity simulations, this study explores the properties of common slicing conditions in Reissner-Nordstrom spacetimes and constructs static and spherically symmetric slices. The solutions parametrized by the charge-to-mass ratio approach a unique slice in the extremal limit.
Article
Physics, Particles & Fields
Davide De Biasio, Julian Freigang, Dieter Luest, Toby Wiseman
Summary: This study considers the analog for the Einstein-Maxwell action and obtains Ricci flow coupled to a Yang-Mills flow for the Maxwell field. It shows that this flow is well-defined for static spacetimes with pure electric or magnetic potentials and preserves both non-extremal and extremal black hole horizons. However, the electric RN black hole is always found to be unstable while the magnetic RN solution becomes a stable fixed point for sufficient charge. Numerical solutions demonstrate that the flow of the near horizon geometry for extremal RN becomes singular in the vicinity of its horizon.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
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
Physics, Particles & Fields
Davood Momeni, Phongpichit Channuie
Summary: This study investigates exact solutions for both Jackiw-Teitelboim gravity and its deformed version, utilizing proper integral transformations over Euclidean time coordinates to examine precise solutions for hyperbolic coverage, cusp geometry, and other compact sectors of the AdS2 spacetime manifold.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Multidisciplinary
Marina-Aura Dariescu, Ciprian Dariescu
Summary: This paper focuses on Reissner-Nordstrom black holes surrounded by quintessence with a state parameter w=-2/3. It investigates the effective potential, circular orbits, and tidal forces, expresses the solution to the Gordon equation using Heun general functions, derives the energy spectrum, and calculates scattering probability and heat capacity on the event horizon.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Physics, Multidisciplinary
Rafael P. Bernar, Luis C. B. Crispino, Haroldo C. D. Lima Junior, Atsushi Higuchi
Summary: The Equivalence Principle is a key concept in General Relativity, stating that a reference frame at rest in a uniform gravitational field is equivalent to one in uniformly accelerated motion without gravity. The study analyzes the spacetime around a non-rotating spherically symmetric charged body, known as Reissner-Nordstrom geometry, and demonstrates its compatibility with the Equivalence Principle through a coordinate transformation. Revisiting the Schwarzschild case and considering second order terms in the expansion parameters of the approximate metric are necessary for accurate curvature calculations at zeroth order.
Article
Physics, Multidisciplinary
S. Hassanabadi, J. Kriz, W. S. Chung, B. C. Lutfuoglu, E. Maghsoodi, H. Hassanabadi
Summary: This study investigates the modification of thermodynamic properties of Schwarzschild and Reissner-Nordstrom black holes in the presence of higher-order GUP. By comparing the GUP-corrected thermodynamic properties for both black holes using graphical methods, differences between the behaviors of the two black holes were observed.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
