scholarly journals Weak deflection gravitational lensing for photons coupled to Weyl tensor in a Schwarzschild black hole

2018 ◽  
Vol 78 (3) ◽  
Author(s):  
Wei-Guang Cao ◽  
Yi Xie
Keyword(s):  
Black Hole ◽  
Gravitational Lensing ◽  
Weyl Tensor ◽  
Schwarzschild Black Hole

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.

scholarly journals Weak and strong deflection gravitational lensing by a renormalization group improved Schwarzschild black hole

2019 ◽  
Vol 79 (12) ◽  
Author(s):  
Xu Lu ◽  
Yi Xie
Keyword(s):  
Black Hole ◽  
Renormalization Group ◽  
Gravitational Lensing ◽  
Galactic Center ◽  
Quantum Effect ◽  
Apparent Size ◽  
Great Care ◽  
Schwarzschild Black Hole ◽  
Sgr A ◽  
Near Future

AbstractWeak and strong deflection gravitational lensing by a renormalization group improved Schwarzschild black hole is investigated and its observables are found. By taking the supermassive black holes Sgr A* and M87* respectively in the Galactic Center and at the center of M87 as lenses, we estimate these observables and analyse possibility of detecting this quantum improvement. It is not feasible to distinguish such a black hole by most observables in the near future except for the apparent size of the shadow. We also note that directly using measured shadow of M87* to constrain this quantum effect requires great care.

scholarly journals Axion-plasmon or magnetized plasma effect on an observable shadow and gravitational lensing of a Schwarzschild black hole

2021 ◽  
Vol 104 (6) ◽  
Author(s):  
Farruh Atamurotov ◽  
Kimet Jusufi ◽  
Mubasher Jamil ◽  
Ahmadjon Abdujabbarov ◽  
Mustapha Azreg-Aïnou
Keyword(s):  
Black Hole ◽  
Gravitational Lensing ◽  
Magnetized Plasma ◽  
Schwarzschild Black Hole ◽  
Plasma Effect

scholarly journals Gravitational Lensing and Wormhole Shadows

2021 ◽  
Vol 65 (12) ◽  
pp. 1185-1193
Author(s):  
M. A. Bugaev ◽  
I. D. Novikov ◽  
S. V. Repin ◽  
A. A. Shelkovnikova
Keyword(s):  
Black Hole ◽  
Gravitational Lensing ◽  
Formation Process ◽  
Gravitational Mass ◽  
Schwarzschild Black Hole ◽  
Scattering Of Light ◽  
Light Rays

Abstract The problem of bending and scattering of light rays passing outside the entrance of a wormhole with zero gravitational mass is considered. The process of ray capture by a wormhole, as well as the formation process of a shadow when illuminated by a standard screen, is investigated. These mechanisms are also compared to the case of light ray motion in the vicinity of the Schwarzschild black hole.

scholarly journals Time delay of photons coupled to Weyl tensor in a regular phantom black hole

2020 ◽  
Vol 80 (7) ◽  
Author(s):  
Xu Lu ◽  
Yi Xie
Keyword(s):  
Black Hole ◽  
Time Delay ◽  
Gravitational Lensing ◽  
Weyl Tensor ◽  
Maxwell Theory ◽  
Time Signals

Abstract Time delay of the photons coupled to the Weyl tensor in a regular phantom black hole is investigated in both weak and strong deflection gravitational lensing. We find that the time delay in the weak deflection lensing strongly depends on the phantom hair while the delay in the strong deflection lensing is significantly affected by the hair and the strength of the coupling. We suggest that it is necessary to measure these two kind of time signals for fully understanding and distinguishing such an interaction beyond the standard Einstein–Maxwell theory.

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