Shadow of the rotating black hole with quintessential energy in the presence of the plasma

TL;DR

This paper investigates how the shadow of a rotating black hole with quintessential energy is affected by plasma and quintessential parameters, revealing that the quintessential field significantly influences shadow size and shape, often dominating plasma effects.

Contribution

It provides a detailed analysis of the combined effects of quintessential energy and plasma on black hole shadow morphology, highlighting the dominant role of the quintessential field parameter.

Findings

The quintessential field parameter increases the shadow radius.

Higher plasma refraction index enlarges the shadow.

Quintessential energy reduces shadow distortion in fast rotating black holes.

Abstract

We study the shadow of the rotating black hole with quintessential energy i) in vacuum and ii) in the presence of plasma with radial power-law density. For vacuum case the quintessential field parameter of the rotating black hole sufficiently changes the shape of the shadow. With the increasing the quintessential field parameter the radius of the shadow also increases. With the increase of the radius of the shadow of the rotating black hole the quintessential field parameter causes decrease of the distortion of the shadow shape: In the presence of the quintessential field parameter the shadow of fast rotating black hole starting to become more close to circle. The shape and size of shadow of quintessential rotating black hole surrounded by plasma depends on i) plasma parameters, ii) black hole spin and iii) quintessential field parameter. With the increase of the plasma refraction index the apparent radius of the shadow increases. However, for the big values of the quintessential field parameter the change of the black hole shadow's shape due to the presence of plasma is not sufficient. In other words: the effect of the quintessential field parameter becomes more dominant with compare to the effect of plasma.