scholarly journals Effects of Homogeneous Plasma on Strong Gravitational Lensing of Kerr Black Holes

2017 ◽  
Vol 34 (9) ◽  
pp. 090401 ◽  
Author(s):  
Chang-Qing Liu ◽  
Chi-Kun Ding ◽  
Ji-Liang Jing
Keyword(s):  
Black Holes ◽  
Gravitational Lensing ◽  
Homogeneous Plasma ◽  
Strong Gravitational Lensing ◽  
Kerr Black Holes

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 of a 4-dimensional Einstein–Gauss–Bonnet black hole in homogeneous plasma

2020 ◽  
Vol 29 (09) ◽  
pp. 2050065 ◽  
Author(s):  
Xing-Hua Jin ◽  
Yuan-Xing Gao ◽  
Dao-Jun Liu
Keyword(s):  
Gravitational Lensing ◽  
Deflection Angle ◽  
Strong Field ◽  
The Novel ◽  
Coupling Constant ◽  
Homogeneous Plasma ◽  
Strong Gravitational Lensing ◽  
Image Separation ◽  
Unmagnetized Plasma ◽  
Deflection Limit

We investigate the strong gravitational lensing of spherically symmetric black holes in the novel Einstein–Gauss–Bonnet (EGB) gravity surrounded by unmagnetized plasma medium. The deflection angle in the strong deflection limit in EGB spacetime with homogeneous plasma is derived. We find that both the coupling constant [Formula: see text] in the novel EGB gravity and the presence of plasma can affect the radius of photon sphere, strong field limit coefficient and other lensing observables significantly, while plasma has little effect on the angular image separation and the relative magnifications as [Formula: see text] and [Formula: see text], respectively.

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

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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