Optical Features of Rotating Black Hole with Nonlinear Electrodynamics

TL;DR

This paper studies the optical properties of rotating black holes influenced by nonlinear electrodynamics, analyzing photon spheres, shadows, and energy emission rates to understand how nonlinearity affects observable features.

Contribution

It constructs a rotating black hole solution with nonlinear electrodynamics using the Newman-Janis algorithm and analyzes its optical shadow and geodesic properties.

Findings

Nonlinear electrodynamics alters shadow shape and size.

Spin and charge influence shadow distortion.

Nonlinearity reduces shadow flatness caused by spin.

Abstract

In this article, we considered the strong field approximation of nonlinear electrodynamics black hole and constructed its rotating counterpart by applying the modified Newman-Janis algorithm. The corresponding metric function in the strong field limit of the static black hole is identified in order to study the radius of photon sphere. However, the metric function for the rotating counterpart in the strong field limit is considered in order to study the horizon radius w.r.t spin parameter. We considered the Hamilton-Jacobi method to derive the geodesic equations for photon and constructed an orthonormal tetrad for deriving the equations for celestial coordinates in the observer's sky. Shadows, distortions and energy emission rates are investigated and the results are compared for different values of nonlinear electrodynamics parameter, charge and spin. It is found that the presence of the nonlinear electrodynamics parameter affects the shape and size of the shadows and thus the distortion in the case of rotation. It is also found that the nonlinearity of electrodynamics diminishes the flatness in the shadow due to the effect of spin and other parameters.