scholarly journals Test-particle dynamics in general spherically symmetric black hole spacetimes

2018 ◽  
Vol 97 (10) ◽  
Author(s):  
Mariafelicia De Laurentis ◽  
Ziri Younsi ◽  
Oliver Porth ◽  
Yosuke Mizuno ◽  
Luciano Rezzolla
Keyword(s):  
Black Hole ◽  
Test Particle ◽  
Particle Dynamics ◽  
Spherically Symmetric ◽  
Black Hole Spacetimes ◽  
Symmetric Black Hole

scholarly journals Cosmic No-Hair in Spherically Symmetric Black Hole Spacetimes

2019 ◽  
Vol 20 (9) ◽  
pp. 3059-3090 ◽  
Author(s):  
João L. Costa ◽  
José Natário ◽  
Pedro Oliveira
Keyword(s):  
Black Hole ◽  
Spherically Symmetric ◽  
Black Hole Spacetimes ◽  
Symmetric Black Hole

scholarly journals Observational signatures of spherically-symmetric black hole spacetimes

2017 ◽  
Vol 942 ◽  
pp. 012007 ◽  
Author(s):  
Mariafelicia De Laurentis ◽  
Ziri Younsi ◽  
Oliver Porth ◽  
Yosuke Mizuno ◽  
Christian Fromm ◽  
...  
Keyword(s):  
Black Hole ◽  
Spherically Symmetric ◽  
Black Hole Spacetimes ◽  
Symmetric Black Hole

EFFECT OF COSMIC STRING IN SPHERICALLY SYMMETRIC BLACK HOLE ON THE DIRAC PERTURBATION

2010 ◽  
Vol 25 (02) ◽  
pp. 111-124 ◽  
Author(s):  
R. SINI ◽  
NIJO VARGHESE ◽  
V. C. KURIAKOSE
Keyword(s):  
Black Hole ◽  
Cosmic String ◽  
Oscillation Frequency ◽  
Quasinormal Modes ◽  
Dirac Field ◽  
Spherically Symmetric ◽  
Black Hole Spacetimes ◽  
Quasi Normal Mode ◽  
Symmetric Black Hole ◽  
Sds Black Hole

The effect of cosmic string on the quasinormal modes (QNMs) of massless Dirac field perturbations were studied in different black hole spacetimes. Quasi-normal mode frequencies of massless Dirac field in Schwarzschild, RN extremal, SdS and near extremal SdS black hole spacetimes with cosmic string are obtained using WKB approximation. Our study shows a clear deviation in QNMs due to presence of cosmic string from those in the absence of string. The influence of cosmic string coded in the form of an increase in the oscillation frequency and damping time of QNMs.

scholarly journals Spinning Test Particle in Four-Dimensional Einstein–Gauss–Bonnet Black Holes

Universe ◽  
2020 ◽  
Vol 6 (8) ◽  
pp. 103 ◽  
Author(s):  
Yu-Peng Zhang ◽  
Shao-Wen Wei ◽  
Yu-Xiao Liu
Keyword(s):  
Black Hole ◽  
Angular Momentum ◽  
Test Particle ◽  
Coupling Parameter ◽  
Accretion Disc ◽  
Spherically Symmetric ◽  
The Novel ◽  
Spin Angular Momentum ◽  
Discrete Structures ◽  
Symmetric Black Hole

In this paper, we investigate the motion of a classical spinning test particle in a background of a spherically symmetric black hole based on the novel four-dimensional Einstein–Gauss–Bonnet gravity [D. Glavan and C. Lin, Phys. Rev. Lett. 124, 081301 (2020)]. We find that the effective potential of a spinning test particle in this background could have two minima when the Gauss–Bonnet coupling parameter α is nearly in a special range −8<α/M2<−2 (M is the mass of the black hole), which means a particle can be in two separate orbits with the same spin-angular momentum and orbital angular momentum, and the accretion disc could have discrete structures. We also investigate the innermost stable circular orbits of the spinning test particle and find that the corresponding radius could be smaller than the cases in general relativity.

scholarly journals Circular Orbit of a Particle and Weak Gravitational Lensing

2020 ◽  
Author(s):  
Zonghai Li ◽  
Guodong Zhang ◽  
Ali Övgün
Keyword(s):  
Black Hole ◽  
Gravitational Lensing ◽  
Circular Orbit ◽  
Deflection Angle ◽  
Geometric Approach ◽  
Spherically Symmetric ◽  
Black Hole Spacetimes ◽  
Weyl Gravity ◽  
Symmetric Black Hole ◽  
Bonnet Theorem

The purpose of this paper is twofold. First, we introduce a geometric approach to study the circular orbit of a particle in static and spherically symmetric spacetime based on Jacobi metric. Second, we apply the circular orbit to study the weak gravitational deflection of null and time-like particles based on Gauss-Bonnet theorem. By this way, we obtain an expression of deflection angle and extend the study of deflection angle to asymptotically non-flat black hole spacetimes. Some black holes as lens are considered such as a static and spherically symmetric black hole in the conformal Weyl gravity and a Schwarzschild-like black hole in bumblebee gravity. Our results are consistent with the previous literature. In particular, we find that the connection between Gaussian curvature and the radius of a circular orbit greatly simplifies the calculation.

scholarly journals Horizon Thermodynamics in D-Dimensional f(R) Black Hole

Entropy ◽  
2020 ◽  
Vol 22 (11) ◽  
pp. 1246
Author(s):  
Chenrui Zhu ◽  
Rong-Jia Yang
Keyword(s):  
Black Hole ◽  
Spherically Symmetric ◽  
Higher Dimensional ◽  
Horizon Thermodynamics ◽  
Symmetric Black Hole

We consider whether the new horizon-first law works in higher-dimensional f(R) theory. We firstly obtain the general formulas to calculate the entropy and the energy of a general spherically-symmetric black hole in D-dimensional f(R) theory. For applications, we compute the entropies and the energies of some black hokes in some interesting higher-dimensional f(R) theories.

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