Investigation of circular geodesics in a rotating charged black hole in the presence of perfect fluid dark matter

TL;DR

This paper explores the properties of circular geodesics around a rotating charged black hole influenced by perfect fluid dark matter, analyzing energy conditions, effective potentials, and energy extraction processes.

Contribution

It introduces a new charged black hole solution with PFDM, derives its rotating metric via Newman-Janis, and studies geodesics and energy extraction in this spacetime.

Findings

Black hole parameters significantly affect geodesic properties.

Effective potentials vary with charge, spin, and dark matter parameters.

Penrose process can occur within the ergosphere, enabling energy gain.

Abstract

In this work we have obtained a charged black hole solution in the presence of perfect fluid dark matter (PFDM) and discuss its energy conditions. The metric corresponding to the rotating avatar of this black hole solution is obtained by incorporating the Newman-Janis algorithm. We then compute two types of circular geodesics, namely, the null geodesics and time-like geodesics for this rotating spacetime geometry. For the case of time-like geodesics, we consider both neutral as well as charged massive particles. The effective potentials of the corresponding circular geodesics has also been studied. We then present our results by graphically representing the collective effects of the black hole parameters, namely, the charge of the black hole ($Q$), spin parameter ($a$) and the PFDM parameter ($\alpha$) on the energy ($E$), angular momentum ($L$) and effective potential ($V_{eff}$) of the concerned particle. Finally, we discuss the Penrose process in order to study the negative energy particles having possible existence within the ergosphere, and which in turn leads to the energy gain of the emitted particle.