Frolov Black Hole Surrounded by Quintessence -- I: Thermodynamics, Geodesics and Shadows

TL;DR

This paper investigates the thermodynamics, geodesic behavior, and shadow characteristics of a Frolov black hole in a quintessence field, revealing parameter-dependent properties and stability features.

Contribution

It provides a comprehensive analysis of the thermodynamic stability, geodesic structure, and shadow size of a Frolov black hole influenced by quintessence, highlighting parameter sensitivities.

Findings

Small BHs are locally thermodynamically stable but globally unstable.

Shadow radii depend strongly on model parameters, weakly on quintessence.

Quintessence parameter has minimal effect on shadow size.

Abstract

The Frolov black hole (BH) is a charged extension of the Hayward BH, having regularity at the central point $r = 0$ and an asymptotically Schwarzschild form for large values of $r$. Such a BH is parameterized by a length scale parameter, \( \alpha_0 \). In this paper, we analyze the thermodynamic properties, null and timelike geodesics, and shadows of a Frolov BH immersed in a quintessence field. Our results indicate that the smaller BH is locally thermodynamically stable yet globally unstable at all horizon radii. Neither the quintessence parameter nor the other model parameters like the charge $q$ and length scale parameter $\alpha_0$ change this global instability. We extend the study of the null and timelike geodesics to the vicinity of the BH by analyzing how the geodesic motion depends on the model parameters. Finally, we analyze the shadow of the BH system and find that the shadow radii are sensitively dependent on model parameters. In contrast, the influence of the quintessence parameter itself on the size of the shadow is found to be rather weak.