Weak gravitational lensing Schwarzschild-MOG black hole in plasma

Abstract

This paper is devoted to study weak gravitational lensing properties around black hole surrounded plasma medium in modified gravity (MOG). We have investigated the effects of the MOG-parametr and plasma medium on the deflection angle and total magnification of the images. we have presented the comparisons of the effects of the uniform plasma, singular isothermal sphere and non-singular isothermal sphere. We have also shown that the uniform plasma effects significantly stronger than the other models of plasma medium.Through the studies of the total magnifications of images of a remote source we have shown that the effects of the MOG parameter and plasma medium are similar and the increase of the MOG parameter and plasma frequency cause to increase the total magnification. Moreover, we have explored and analyzed how the MOG effects can reflect the plasma medium providing the same values of the total magnification of images.

Shadow of the Kerr-like black hole

“…On the other hand the effects of plasma of different configurations on gravitational lensing and consequently on deflection angle of light rays in various BH spacetimes have been investigated, see e.g. in [63,[66][67][68][69][70][71][72][73][74][75][76].…”

Shadow and weak gravitational lensing of a rotating regular black hole in a non-minimally coupled Einstein-Yang-Mills theory in the presence of plasma

“…Bisnovatyi-Kogan and Tsupko further, investigated non-linear effects connected with the combined action of gravity and plasma medium by using Synge's theory [63,64]. Moreover, the effect of plasma medium around BHs on lensing effects has been studied in [45,46,48,[65][66][67][68][69][70][71][72][73][74][75][76][77] and references therein. The study of modified theories of gravity (MGT) has been of great interest because it provides numerous static and spherically symmetric BH solutions [18,[78][79][80][81][82][83].…”

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

“…However, the photon trajectory would be quite different in vacuum and in a dense electrically charged medium such as a plasma near a BH [32,33]. It has been reported several times with different models in the scientific literature [34][35][36][37][38][39][40][41] that the plasma surrounding a BH forces light to bend further i.e. α tot = α BH + α plasma , which represents the contributions to the total deflection angle due to a BH and plasma separately.…”