Shadow, deflection angle and quasinormal modes of Born-Infeld charged black holes

TL;DR

This paper investigates optical properties and quasinormal modes of Born-Infeld charged black holes within a specific 4D Einstein-Gauss-Bonnet gravity theory, highlighting potential observational signatures for testing the model.

Contribution

It analyzes optical features and quasinormal modes of BI charged black holes in a novel 4D EGB gravity framework, linking parameters to observable signatures.

Findings

Parameter variations affect shadow radius and deflection angle.

Connections between shadow size and quasinormal modes are established.

Potential for astrophysical tests of the gravity model.

Abstract

In this paper, we consider black holes in the consistent Aoki-Gorji-Mukohyama theory of the four-dimensional Einstein-Gauss-Bonnet (4D EGB) gravity in the presence of Born-Infeld (BI) nonlinear electrodynamics. We study several optical features of these black holes such as the shadow radius, energy emission rate and deflection angle, and analyse the effect of the coupling constants, the electric charge and cosmological constant on the considered optical quantities. Furthermore, we also employ the connection between the shadow radius and quasinormal modes (QNMs) and investigate small scalar perturbations around the black hole solution. We show that the variation of the parameters of the theory provide specific signatures on the optical features of the BI charged black hole solution, thus leading to the possibility of directly testing this consistent Aoki-Gorji-Mukohyama 4D EGB black hole model by using astrophysical observations.