Black hole shadow to probe modified gravity

被引：32
|
作者：
Stepanian, A. [1 ]
Khlghatyan, Sh. [1 ]
Gurzadyan, V. G. [1 ,2 ]
机构：
[1] Yerevan State Univ, Ctr Cosmol & Astrophys, Alikhanian Natl Lab, Yerevan, Armenia
[2] Sapienza Univ Roma, SIA, Rome, Italy
来源：
EUROPEAN PHYSICAL JOURNAL PLUS | 2021年 / 136卷 / 01期
关键词：
COSMOLOGICAL CONSTANT;
D O I：
10.1140/epjp/s13360-021-01119-2
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We study the black hole's shadow for Schwarzschild-de Sitter and Kerr-de Sitter metrics with the contribution of the cosmological constant Lambda. Based on the reported parameters of the M87* black hole shadow, we obtain constraints for the Lambda and show the agreement with the cosmological data. It is shown that the coupling of the Lambda -term with the spin parameter reveals peculiarities for the photon spheres and hence for the shadows. Within the parametrized post-Newtonian formalism, the constraint for the corresponding Lambda -determined parameter is obtained.
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页数：7
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