Probing a regular non-minimal Einstein-Yang-Mills black hole with gravitational lensings

被引：47

作者：

Liu, Feng-Yuan ^{[1
,2
]}

Mai, Yi-Fan ^{[1
,2
]}

Wu, Wen-Yu ^{[1
,2
]}

Xie, Yi ^{[1
,2
]}

机构：

[1] Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Jiangsu, Peoples R China

[2] Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210023, Jiangsu, Peoples R China

来源：

PHYSICS LETTERS B | 2019年 / 795卷

基金：

中国国家自然科学基金;

关键词：

Non-minimal Einstein-Yang-Mills theory; Regular black hole; Gravitational lensing; FIELD;

D O I：

10.1016/j.physletb.2019.06.052

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate weak and strong deflection gravitational lensings of the regular black hole predicted by a non-minimal Einstein-Yang-Mills theory. We find that its weak deflection lensing is the same as a Reissner-Nordstrom black hole's. Observables in the strong deflection lensing, including the apparent radius of the photon sphere (shadow) as well as the angular separation, brightness difference and time delay between relativistic images, are obtained and analyzed for the supermassive black holes Sgr A* and M87* in the Galactic Center and at the center of M87. We find that only the apparent radii of the photon spheres are within the ability of current technology, whereas there is not enough resolution to distinguish the regular Einstein-Yang-Mills black hole from the Reissner-Nordstrom one. Meanwhile, caution needs to be paid when the diameter of M87*'s shadow measured by the Event Horizon Telescope is directly taken to constrain such a regular black hole. (C) 2019 The Author(s). Published by Elsevier B.V.

引用

页码：475 / 481

页数：7

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