scholarly journals A correlational study: Establishing the link between quantum parameters and particle dynamics around Schwarzschild black hole

2021 ◽  
pp. 104346
Author(s):  
Muhammad Saeed ◽  
Israr Ali Khan ◽  
Amir Sultan Khan ◽  
Shah Qasim Jan ◽  
Saeed Islam ◽  
...  
Keyword(s):  
Black Hole ◽  
Particle Dynamics ◽  
Correlational Study ◽  
Schwarzschild Black Hole ◽  
Quantum Parameters

Dynamics of the particle around AdS Schwarzschild black hole environed by quintessence

2020 ◽  
Author(s):  
Amir Sultan Khan ◽  
Farhad Ali ◽  
Israr Ali Khan
Keyword(s):  
Magnetic Field ◽  
Black Hole ◽  
Charged Particles ◽  
Particle Dynamics ◽  
Point Particle ◽  
Noether Symmetries ◽  
Escape Velocity ◽  
Schwarzschild Black Hole ◽  
Complex Motion ◽  
Celestial Bodies

The field of point particle dynamics is correlated with the particle dynamics around a black hole, and one can initiate the investigation of a more complex motion of extended bodies/celestial bodies. In this article, we study the dynamics of neutral/charged particles around the AdS Schwarzschild black hole surrounded by quintessence. At the foot of Noether symmetries and the conservation laws of the proposed spacetime, we discuss the effect of the cosmological constant, angular momentum, quintessence parameter, and magnetic field on the dynamics of neutral and charged particles in the form of the effective potential, effective force and escape velocity. Finally, we investigate the orbit stability of spacetime with the help of the Lyapunov exponent.

Dynamics of the particle around de Sitter–Schwarzschild black hole surrounded by quintessence

2020 ◽  
Vol 35 (23) ◽  
pp. 2050130
Author(s):  
Israr Ali Khan ◽  
Amir Sultan Khan ◽  
Saeed Islam
Keyword(s):  
Magnetic Field ◽  
Black Hole ◽  
Dark Energy ◽  
Comparative Study ◽  
Effective Potential ◽  
Charged Particles ◽  
Particle Dynamics ◽  
Escape Velocity ◽  
De Sitter ◽  
Schwarzschild Black Hole

The study of particle dynamics in the vicinity of a black hole environed by dark energy and magnetic field has attracted researchers for their importance in astrophysics and cosmology. In this paper, we study the dynamics of neutral and charged particles in the vicinity of de Sitter–Schwarzschild black hole (DS–Sch-BH) surrounded by quintessence. The effect of the DS part is explored by virtue of effective potential, effective force, and escape velocity of the particle (neutral and charged) moving around DS–Sch-BH. Finally, a comparative study is also investigated.

scholarly journals Particle Dynamics Around a Charged Black Hole

2018 ◽  
Vol 168 ◽  
pp. 04006
Author(s):  
Sehrish Iftikhar
Keyword(s):  
Black Hole ◽  
Circular Orbit ◽  
Particle Dynamics ◽  
Escape Velocity ◽  
Schwarzschild Black Hole ◽  
Stable Circular Orbit ◽  
Innermost Stable Circular Orbit ◽  
The Stability ◽  
Dynamics Of Particles ◽  
Noncommutative Parameter

This paper investigates particle dynamics around the noncommutative Reissner Nordström black hole. We study escape velocity of the particle at innermost stable circular orbit. In order to discuss the stability of orbits we analyze effective potential.We compare our results with the dynamics of particles in Reissner Nordström as well as noncommutative Schwarzschild black hole. We observe that the noncommutative parameter affects the motion of particles.

The Schwarzschild black hole

2018 ◽  
Author(s):  
Nathalie Deruelle ◽  
Jean-Philippe Uzan
Keyword(s):  
Black Hole ◽  
Gravitational Field ◽  
Equilibrium Configuration ◽  
Original Form ◽  
Schwarzschild Black Hole ◽  
Schwarzschild Metric ◽  
Schwarzschild Geometry

This chapter discusses the Schwarzschild black hole. It demonstrates how, by a judicious change of coordinates, it is possible to eliminate the singularity of the Schwarzschild metric and reveal a spacetime that is much larger, like that of a black hole. At the end of its thermonuclear evolution, a star collapses and, if it is sufficiently massive, does not become stabilized in a new equilibrium configuration. The Schwarzschild geometry must therefore represent the gravitational field of such an object up to r = 0. This being said, the Schwarzschild metric in its original form is singular, not only at r = 0 where the curvature diverges, but also at r = 2m, a surface which is crossed by geodesics.

scholarly journals Black hole S-matrix for a scalar field

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Panos Betzios ◽  
Nava Gaddam ◽  
Olga Papadoulaki
Keyword(s):  
Black Hole ◽  
Normal Modes ◽  
Massless Scalar ◽  
Scattering Process ◽  
Schwarzschild Black Hole ◽  
Asymptotically Flat ◽  
Scalar Particles ◽  
Black Hole Background ◽  
S Matrix ◽  
Do So

Abstract We describe a unitary scattering process, as observed from spatial infinity, of massless scalar particles on an asymptotically flat Schwarzschild black hole background. In order to do so, we split the problem in two different regimes governing the dynamics of the scattering process. The first describes the evolution of the modes in the region away from the horizon and can be analysed in terms of the effective Regge-Wheeler potential. In the near horizon region, where the Regge-Wheeler potential becomes insignificant, the WKB geometric optics approximation of Hawking’s is replaced by the near-horizon gravitational scattering matrix that captures non-perturbative soft graviton exchanges near the horizon. We perform an appropriate matching for the scattering solutions of these two dynamical problems and compute the resulting Bogoliubov relations, that combines both dynamics. This allows us to formulate an S-matrix for the scattering process that is manifestly unitary. We discuss the analogue of the (quasi)-normal modes in this setup and the emergence of gravitational echoes that follow an original burst of radiation as the excited black hole relaxes to equilibrium.

scholarly journals Null Geodesics and Strong Field Gravitational Lensing in a String Cloud Background

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
M. Sharif ◽  
Sehrish Iftikhar
Keyword(s):  
Black Hole ◽  
Gravitational Lensing ◽  
Galactic Center ◽  
Deflection Angle ◽  
Orbital Motion ◽  
Strong Field ◽  
Schwarzschild Black Hole ◽  
Field Limit ◽  
Null Geodesics ◽  
Supermassive Black Hole

This paper is devoted to studying two interesting issues of a black hole with string cloud background. Firstly, we investigate null geodesics and find unstable orbital motion of particles. Secondly, we calculate deflection angle in strong field limit. We then find positions, magnifications, and observables of relativistic images for supermassive black hole at the galactic center. We conclude that string parameter highly affects the lensing process and results turn out to be quite different from the Schwarzschild black hole.

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