Gravitational lensing by a black hole with torsion

被引：4

作者：

Zhang, Lu ^{[1
,2
,3
]}

Chen, Songbai ^{[1
,2
,3
,4
]}

Jing, Jiliang ^{[1
,2
,3
,4
]}

机构：

[1] Hunan Normal Univ, Inst Phys, Changsha 410081, Hunan, Peoples R China

[2] Hunan Normal Univ, Dept Phys, Changsha 410081, Hunan, Peoples R China

[3] Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Minist Educ, Changsha 410081, Hunan, Peoples R China

[4] Hunan Normal Univ, Synerget Innovat Ctr Quantum Effects & Applicat, Changsha 410081, Hunan, Peoples R China

来源：

INTERNATIONAL JOURNAL OF MODERN PHYSICS D | 2018年 / 27卷 / 12期

基金：

中国国家自然科学基金;

关键词：

Gravitational lensing; black hole; torsion; GENERAL-RELATIVITY; UNIVERSE; SPIN; SUPERNOVAE; EINSTEIN; GRAVITY; FIELD; CONSTRAINTS;

D O I：

10.1142/S0218271818501109

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this paper, we have investigated the gravitational lensing in a spherically symmetric spacetime with torsion in the generalized Einstein-Cartan-Kibble-Sciama (ECKS) theory of gravity by considering higher order terms. The torsion parameters change the spacetime structure, which affects the photon sphere, the deflection angle and the strong gravitational lensing. The condition of existence of horizons is not inconsistent with that of the photon sphere. Especially, there exists a novel case in which there is horizon but no photon sphere for the considered spacetime. In this special case, the deflection angle of the light ray near the event horizon also diverges logarithmically, but the coefficients in the strong-field limit are different from those in the cases with photon sphere. Moreover, in the far-field limit, we find that the deflection angle for certain torsion parameters approaches zero from the negative side, which is different from those in the usual spacetimes.

引用

页数：15

共 56 条

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