Weak gravitational lensing by an ESTGB black hole in the presence of a plasma

Author:

Li Qian1,Zhang Yu1,Lin Zhi-Wen1,Li Qi-Quan1,Sun Qi1

Affiliation:

1. Faculty of Science, Kunming University of Science and Technology, Kunming 650500, P. R. China

Abstract

This paper is devoted to studying the weak-field gravitational lensing properties of a 4D ESTGB black hole, which is surrounded by the plasma medium. The effects of the magnetic charges and the three plasma distribution models in the deflection of light around a 4D ESTGB black hole are investigated in detail. We find that the uniform plasma leads to a larger deflection of light rays in comparison with the singular isothermal sphere (SIS), the non-singular isothermal sphere (NSIS) models. Moreover, the deflection angle increases slightly as the absolute value of the magnetic charge decreases. Finally, we analyze the total magnification of image due to weak gravitational lensing around the black hole. The result shows that the presence of a uniform plasma medium remarkably enhances the total magnification whereas the non-uniform plasma reduces the total magnification.

Funder

National Natural Science Foundation of China

Yunnan High-level Talent Training Support Plan Young & Elite Talents Project

Fund for Reserve Talents of Young and Middle-aged Academic and Technical Leaders of Yunnan Province

Publisher

World Scientific Pub Co Pte Ltd

Subject

General Physics and Astronomy,Astronomy and Astrophysics,Nuclear and High Energy Physics

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