Rotating charged black hole in 4D Einstein-Gauss-Bonnet gravity: Photon motion and its shadow

We construct a charged rotating black hole in 4D Einstein-Gauss-Bonnet (EGB) gravity starting from charged black hole in 4D EGB gravity using complex coordinate transformations suggested by Newman-Janis. Further, we have studied the null geodesics to investigate the shape of the shadow cast by a rotating charged black hole in 4D EGB gravity. Also we have discussed their horizon properties and shadow cast. The phenomenon of black hole shadows alongwith the horizon structure and energy emission has been analyzed to see the influence of Gauss-Bonnet term and black hole charge on horizon, shadow, effective potential and energy emission rate which are compared to their non rotating counterpart. It has been seen that the Gauss-Bonnet parameter have an influence on the shape and size of the shadow as well as on the effective potential, horizon and energy emission rate. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

A charged rotating black hole was constructed in 4D Einstein-Gauss-Bonnet gravity from a charged black hole in 4D EGB gravity using complex coordinate transformations suggested by Newman-Janis. The null geodesics were studied to investigate the shadow shape cast by a rotating charged black hole in 4D EGB gravity, with analysis on the influence of Gauss-Bonnet term and black hole charge on horizon, shadow, effective potential, and energy emission rate. The Gauss-Bonnet parameter was found to have an impact on the shape and size of the shadow, as well as on the effective potential, horizon, and energy emission rate.