Strong gravitational lensing of a 4-dimensional Einstein-Gauss-Bonnet black hole in homogeneous plasma

被引：72

作者：

Jin, Xing-Hua ^{[1
]}

Gao, Yuan-Xing ^{[2
,3
]}

Liu, Dao-Jun ^{[2
,3
]}

机构：

[1] Shanghai Business Sch, Dept Math, Shanghai 200235, Peoples R China

[2] Shanghai Normal Univ, Ctr Astrophys, Shanghai 200234, Peoples R China

[3] Shanghai Normal Univ, Dept Phys, Shanghai 200234, Peoples R China

来源：

INTERNATIONAL JOURNAL OF MODERN PHYSICS D | 2020年 / 29卷 / 09期

关键词：

Strong gravitational lensing; EGB spacetime; plasma; black hole; FIELD; TENSOR; LIMIT;

D O I：

10.1142/S0218271820500650

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 alpha 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 alpha/M-2 -> -8 and alpha/M-2 -> 1, respectively.

引用

页数：22

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