Black hole shadow to probe modified gravity
General Relativity and Quantum Cosmology
2021-01-29 v1 Cosmology and Nongalactic Astrophysics
Abstract
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 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.
Cite
@article{arxiv.2101.08261,
title = {Black hole shadow to probe modified gravity},
author = {A. Stepanian and Sh. Khlghatyan and V. G. Gurzadyan},
journal= {arXiv preprint arXiv:2101.08261},
year = {2021}
}
Comments
7 pages, Eur. Phys. J. Plus (in press)