Affine perturbation series of the deflection angle of a ray near the photon sphere of a Reissner-Nordstrom black hole

被引：11
作者：
Tsukamoto, Naoki [1 ]
机构：
[1] Natl Inst Technol, Hachinohe Coll, Dept Gen Sci & Educ, Aomori 0391192, Japan
来源：
PHYSICAL REVIEW D | 2022年 / 106卷 / 08期
关键词：
TELESCOPE RESULTS. I; SHADOW; FIELD; STAR; SHAPE;
D O I：
10.1103/PhysRevD.106.084025
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We investigate the affine perturbation series of the deflection angle of a ray near the photon sphere of an extreme Reissner-Nordstrom black hole. We compare the 0th and 1st orders of the affine perturbation series with the deflection angle in a strong deflection limit. We conclude that the 0th order of the affine perturbation series is more accurate than the deflection angle in the strong deflection limit and that we should improve a strong-deflection-limit analysis by using the 0th order of the affine perturbation series.
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页数：8
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