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

Understand

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.