Optical features of rotating black hole with nonlinear electrodynamics

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.

A regular MOG black hole’s impact on shadows and gravitational weak lensing in the presence of a quintessence field

“…Furthermore, the authors of [57][58][59] delved into the shadow of the BH for diferent BH backgrounds. It was discovered that all BH parameters have a considerable impact on the shadow and other physical observables.…”

“…Note that the BH shadow as a disc was considered by Synge [40] and Luminet [41] focusing on studying the light deflection in the close vicinity of the Schwarzschild BH. Over the past years, BH shadows have been widely investigated and modeled theoretically: see, for example, [42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59]. In recent years, BH shadows have been considered in the context of MOG theory [60][61][62], addressing the shadows of non-rotating and rotating BHs.…”