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Rotating black holes in $4D$ Einstein-Gauss-Bonnet gravity and its shadow

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arxiv 2003.08927 v3 pith:N4OPD7XV submitted 2020-03-19 gr-qc

Rahul Kumar , Sushant G. Ghosh This is my paper · ORCID
classification gr-qc
keywords blackgravityholesparametershadowrotatingcouplingeinstein-gauss-bonnet
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abstract

Recently there has been a surge of interest in regularizing, a $ D \to 4 $ limit of, the Einstein-Gauss-Bonnet (EGB) gravity, and the resulting regularized $4D$ EGB gravity has nontrivial dynamics. The theory admits spherically symmetric black holes generalizing the Schwarzschild black holes. We consider the rotating black hole in regularized $4D$ EGB gravity and discuss their horizon properties and shadow cast. The effects of the GB coupling parameter on the shape and size of shadows are investigated in the context of recent M87* observations from the EHT. Interestingly, for a given spin parameter, the apparent size of the shadow decreases and gets more distorted due to the GB coupling parameter. We find that within the finite parameter space, e.g. for $a=0.1M$, $\alpha\leq 0.00394M^2$, and within the current observational uncertainties, the rotating black holes of the $4D$ EGB gravity are consistent with the inferred features of M87* black hole shadow.

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Cited by 5 Pith papers

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    gr-qc 2025-10 conditional novelty 4.0 of 10

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