scholarly journals Spinning test body orbiting around a Schwarzschild black hole: Comparing spin supplementary conditions for circular equatorial orbits

2021 ◽  
Vol 104 (2) ◽  
Author(s):  
Iason Timogiannis ◽  
Georgios Lukes-Gerakopoulos ◽  
Theocharis A. Apostolatos
Keyword(s):  
Black Hole ◽  
Test Body ◽  
Schwarzschild Black Hole

scholarly journals Spinning test body orbiting around a Schwarzschild black hole: Circular dynamics and gravitational-wave fluxes

2016 ◽  
Vol 94 (10) ◽  
Author(s):  
Enno Harms ◽  
Georgios Lukes-Gerakopoulos ◽  
Sebastiano Bernuzzi ◽  
Alessandro Nagar
Keyword(s):  
Black Hole ◽  
Gravitational Wave ◽  
Test Body ◽  
Schwarzschild Black Hole

A spinning test body in the strong field of a Schwarzschild black hole

1996 ◽  
Vol 13 (5) ◽  
pp. 799-812 ◽  
Author(s):  
Theocharis A Apostolatos
Keyword(s):  
Black Hole ◽  
Strong Field ◽  
Test Body ◽  
Schwarzschild Black Hole

scholarly journals Publisher’s Note: Spinning test body orbiting around a Schwarzschild black hole: Circular dynamics and gravitational-wave fluxes [Phys. Rev. D 94 , 104010 (2016)]

2019 ◽  
Vol 100 (12) ◽  
Author(s):  
Enno Harms ◽  
Georgios Lukes-Gerakopoulos ◽  
Sebastiano Bernuzzi ◽  
Alessandro Nagar
Keyword(s):  
Black Hole ◽  
Gravitational Wave ◽  
Test Body ◽  
Schwarzschild Black Hole

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.

Strong Gravitational Lensing for the Quantum-Modified Schwarzschild Black Hole

2021 ◽  
Vol 60 (1) ◽  
pp. 387-396
Author(s):  
Ruanjing Zhang ◽  
Jian Lin ◽  
Qihong Huang
Keyword(s):  
Black Hole ◽  
Gravitational Lensing ◽  
Schwarzschild Black Hole ◽  
Strong Gravitational Lensing

scholarly journals Spinning test body orbiting around a Kerr black hole: Eccentric equatorial orbits and their asymptotic gravitational-wave fluxes

2021 ◽  
Vol 103 (10) ◽  
Author(s):  
Viktor Skoupý ◽  
Georgios Lukes-Gerakopoulos
Keyword(s):  
Black Hole ◽  
Gravitational Wave ◽  
Kerr Black Hole ◽  
Test Body

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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