Equatorial light bending around Kerr-Newman black holes

被引：28

作者：

Hsiao, You-Wei ^{[1
]}

Lee, Da-Shin ^{[1
]}

Lin, Chi-Yong ^{[1
]}

机构：

[1] Natl Dong Hwa Univ, Dept Phys, Hualien 97401, Taiwan

来源：

PHYSICAL REVIEW D | 2020年 / 101卷 / 06期

关键词：

FIELD; PARAMETERS;

D O I：

10.1103/PhysRevD.101.064070

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the deflection angle of a light ray as it traverses on the equatorial plane of a charged spinning black hole. We provide detailed analysis of the light ray's trajectory, and derive the closed-form expression of the deflection angle due to the black hole in terms of elliptic integrals. In particular, the geodesic equation of the light ray along the radial direction can be used to define an appropriate "effective potential." The nonzero charge of the black hole shows stronger repulsive effects to prevent light rays from falling into the black hole as compared with the Kerr case. As a result, the radius of the innermost circular motion of light rays with the critical impact parameter decreases as charge Q of the black hole increases for both direct and retrograde motions. Additionally, the deflection angle decreases when Q increases with the fixed impact parameter. These results will have a direct consequence on constructing the apparent shape of a charged rotating black hole.

引用

页数：13

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