Black hole shadow to probe modified gravity

A. Stepanian; Sh. Khlghatyan; V.G. Gurzadyan

Black hole shadow to probe modified gravity

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arxiv 2101.08261 v1 pith:RGPY2CFN submitted 2021-01-20 gr-qc astro-ph.CO

A. Stepanian , Sh. Khlghatyan , V.G. Gurzadyan This is my paper · ORCID

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keywords blackholeshadowcosmologicallambdaparametersitteragreement

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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 $\Lambda$ 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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Greybody Factor for massive scalar field in charged black hole
gr-qc 2025-01 unverdicted novelty 3.0 of 10

For a massive scalar field around a charged black hole, the greybody factor falls as the field mass rises, consistent between WKB and rigorous bound methods.

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