Shadows of magnetically charged rotating black holes surrounded by quintessence

TL;DR

This paper analyzes how the presence of quintessence dark energy influences the optical shadows of magnetically charged rotating black holes, revealing complex photon regions and observable shadow distortions.

Contribution

It introduces a detailed study of black hole shadows in the context of magnetically charged rotating black holes immersed in quintessence, highlighting the effects of dark energy on shadow features.

Findings

Photon regions depend on horizon structure

Black hole shadows show significant distortion due to quintessence

Shadow features are sensitive to magnetic charge and angular momentum

Abstract

In this work, we study the optical properties of a class of magnetically charged rotating black hole spacetimes. The black holes in question are assumed to be immersed in the quintessence field, and subsequently, the resulting black hole shadows are expected to be modified by the presence of the dark energy. We investigate the photon region and the black hole shadow, and in particular, their dependence on the relevant physical conditions such as the state parameter of the quintessence, the angular momentum, and the magnitude of the magnetic charge. It is shown that the photon regions sensitively depend on the horizon structure and possess intricate features. Moreover, from the viewpoint of a static observer, we explore a few observables, especially those associated with the distortion of the observed black hole shadows.