Plasma impact on black hole shadows and gravitational weak lensing in the Einstein-Maxwell-scalar theory  

作　　者：Mirzabek Alloqulov Sanjar Shaymatov Abdul Jawad Oripjon Zaripov 

机构地区：[1]Institute of Fundamental and Applied Research,National Research University TIIAME,Kori Niyoziy 39,Tashkent 100000,Uzbekistan [2]University of Tashkent for Applied Sciences,Str.Gavhar 1,Tashkent 100149,Uzbekistan [3]Shahrisabz State Pedagogical Institute,Shahrisabz Str.10,Shahrisabz 181301,Uzbekistan [4]Institute for Theoretical Physics and Cosmology,Zhejiang University of Technology,Hangzhou 310023,People's Republic of China [5]Tashkent State Technical University,Tashkent 100095,Uzbekistan [6]Western Caspian University,Baku AZ1001,Azerbaijan [7]Department of Mathematics,COMSATS University Islamabad,Lahore Campus,Lahore-54000,Pakistan

出　　处：《Communications in Theoretical Physics》2025年第1期130-142,共13页理论物理通讯(英文版)

基　　金：supported by the National Natural Science Foundation of China under Grant No.11675143;the National Key Research and Development Program of China under Grant No.2020YFC2201503。

摘　　要：In this paper,we investigate the optical properties of a non-rotating charged black hole(BH)in the Einstein-Maxwell-scalar(EMS)theory,together with a plasma medium.We first consider the photon sphere and shadow radius under the impact of the plasma medium existing in the environment surrounding the BH in the EMS theory.We show that the radius of the photon sphere and the BH shadow decrease under the influence of the parameterβ.We further study gravitational weak lensing in detail by adapting general methods and derive the light ray's deflection angle around the BH together with the plasma environment.It is found that for uniform plasma,the deflection angle increases with the rise of the plasma parameter,whereas it decreases with the increase of the plasma parameter for non-uniform plasma.Besides,we also study the magnification of image brightness.

关 键 词：general relativity black hole shadow gravitational weak lensing 

分 类 号：P15[天文地球—天文学]