Optical Features of AdS Black Holes in the Novel 4D EinsteinGaussBonnet Gravity Coupled to Nonlinear Electrodynamics
Abstract
An alternative theory of gravity that has attracted much attention recently is the novel fourdimensional EinsteinGaussBonnet (4D EGB) gravity. The theory is rescaled by the GaussBonnet (GB) coupling constant α→α/(D‑4) in D dimensions and redefined as fourdimensional gravity in the limit D→4. Thus, in this manner, the GB term yields a nontrivial contribution to the gravitational dynamics. In fact, regularized black hole solutions and applications in the novel 4D EGB gravity have also been extensively explored. In this work, motivated by recent astrophysical observations, we present an indepth study of the optical features of AdS black holes in the novel 4D EGB gravity coupled to exponential nonlinear electrodynamics (NED), such as the shadow geometrical shape, the energy emission rate, the deflection angle and quasinormal modes. Taking into account these dynamic quantities, we investigate the effects on the black hole solution by varying the parameters of the models. More specifically, we show that the variation of the GB and NED parameters, and of the cosmological constant, imprints specific signatures on the optical features of AdS black holes in the novel 4D EGB gravity coupled to nonlinear electrodynamics, thus leading to the possibility of directly testing these black hole models by using astrophysical observations.
 Publication:

Universe
 Pub Date:
 March 2022
 DOI:
 10.3390/universe8030182
 arXiv:
 arXiv:2009.12988
 Bibcode:
 2022Univ....8..182J
 Keywords:

 black holes;
 higherderivative theories of gravity;
 observational signatures;
 General Relativity and Quantum Cosmology;
 Astrophysics  High Energy Astrophysical Phenomena;
 High Energy Physics  Theory
 EPrint:
 11 pages, 5 figures. V2: references added. V3: 20 pages, 5 figures