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.

引用

页数：7