Regular Article - Theoretical Physics
Gravitational lensing by charged black hole in regularized 4D Einstein–Gauss–Bonnet gravity
Centre for Theoretical Physics, Jamia Millia Islamia, 110025, New Delhi, India
2 Astrophysics and Cosmology Research Unit, School of Mathematics, Statistics and Computer Science, University of KwaZulu-Natal, Private Bag 54001, 4000, Durban, South Africa
Accepted: 26 October 2020
Published online: 7 December 2020
Among the higher curvature gravities, the most extensively studied theory is the so-called Einstein–Gauss–Bonnet (EGB) gravity, whose Lagrangian contains Einstein term with the GB combination of quadratic curvature terms, and the GB term yields nontrivial gravitational dynamics in . Recently there has been a surge of interest in regularizing, a limit of, the EGB gravity, and the resulting regularized 4D EGB gravity valid in 4D. We consider gravitational lensing by Charged black holes in the 4D EGB gravity theory to calculate the light deflection coefficients in strong-field limits and , while former increases with increasing GB parameter and charge q, later decrease. We also find a decrease in the deflection angle , angular position decreases more slowly and impact parameter for photon orbits more quickly, but angular separation s increases more rapidly with and charge q. We compare our results with those for analogous black holes in General Relativity (GR) and also the formalism is applied to discuss the astrophysical consequences in the case of the supermassive black holes Sgr A* and M87*.
© The Author(s) 2020
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