scholarly journals Strong gravitational lensing for black holes with scalar charge in massive gravity

2017 ◽  
Vol 95 (6) ◽  
Author(s):  
Ruanjing Zhang ◽  
Jiliang Jing ◽  
Songbai Chen
Keyword(s):  
Black Holes ◽  
Gravitational Lensing ◽  
Massive Gravity ◽  
Strong Gravitational Lensing ◽  
Scalar Charge

scholarly journals Strong gravitational lensing by Kerr and Kerr-Newman black holes

2021 ◽  
Vol 103 (10) ◽  
Author(s):  
Tien Hsieh ◽  
Da-Shin Lee ◽  
Chi-Yong Lin
Keyword(s):  
Black Holes ◽  
Gravitational Lensing ◽  
Strong Gravitational Lensing

scholarly journals Strong gravitational lensing by DHOST black holes

2021 ◽  
Author(s):  
Javier Chagoya ◽  
Carlos Ortiz ◽  
Benito Rodriguez ◽  
Armando A Roque
Keyword(s):  
Black Holes ◽  
Gravitational Lensing ◽  
Strong Gravitational Lensing

scholarly journals Strong gravitational lensing by Schwarzschild black holes

Astrophysics ◽  
2008 ◽  
Vol 51 (1) ◽  
pp. 99-111 ◽  
Author(s):  
G. S. Bisnovatyi-Kogan ◽  
O. Yu. Tsupko
Keyword(s):  
Black Holes ◽  
Gravitational Lensing ◽  
Strong Gravitational Lensing

scholarly journals Black holes in massive gravity: Quasinormal modes of Dirac field perturbations

2015 ◽  
Vol 30 (29) ◽  
pp. 1550147 ◽  
Author(s):  
Sharmanthie Fernando
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Quasinormal Modes ◽  
Massive Gravity ◽  
Mode Number ◽  
Dirac Field ◽  
Schwarzschild Black Hole ◽  
Scalar Charge

We have studied quasinormal modes (QNMs) of spinor-[Formula: see text], massless Dirac field perturbations of a black hole in massive gravity. The parameters of the theory, such as the mass of the black hole, the scalar charge of the black hole, mode number and the multipole number are varied to observe how the corresponding quasinormal frequencies change. We have also used the Pöschl–Teller approximation to reach analytical values for the frequencies of quasinormal modes for comparison with the numerically obtained values. Comparisons are done with the frequencies of the Schwarzschild black hole.

Strong gravitational lensing around dilaton–axion black holes having special coupling with electromagnetic field

2021 ◽  
Author(s):  
Tanwi Ghosh ◽  
Amna Ali
Keyword(s):  
Black Holes ◽  
Gravitational Lensing ◽  
Deflection Angle ◽  
Strong Field ◽  
Observational Evidence ◽  
The Other ◽  
Strong Gravitational Lensing ◽  
The Galaxy ◽  
The Deflection Angle ◽  
Lensing Effect

Recent observational evidence reveals the existence of black holes in the galaxy. Using strong field lensing effect, we find out the expressions of the radius of the photon sphere, the deflection angle, the separation between the first and the other images, the ratio between the flux of the first image as well as the flux coming from all the other images for dilaton–axion black holes and compare the results with Reissner–Nordstrom black holes. We also investigate the variations of primary and secondary image positions as well as their magnifications with respect to the source position for this kind of black holes.

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