http://arxiv.org/abs/2101.08261
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.
A. Stepanian, S. Khlghatyan and V. Gurzadyan
Fri, 22 Jan 21
46/69
Comments: 7 pages, Eur. Phys. J. Plus (in press)
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