Particle motion and collisions around rotating regular black hole

TL;DR

This paper investigates particle motion, collisions, and energy extraction mechanisms around a rotating regular black hole derived from the Ayón-Beato-García solution, highlighting how electric charge influences these processes and efficiencies.

Contribution

It provides new insights into how electric charge affects particle orbits, collision energies, and energy extraction efficiency in rotating regular black holes.

Findings

Electric charge decreases gravitational potential, reducing bound energy needed for circular orbits.

Energy extraction efficiency via BSW process increases with electric charge.

Penrose process efficiency decreases with electric charge, remaining below 20.7%.

Abstract

The neutral particle motion around rotating regular black hole that was derived from the Ay\'{o}n-Beato-Garc\'{i}a black hole solution by the Newman-Janis algorithm in the preceding paper [Phys. Rev. D 89, 104017, (2014)] has been studied. The dependencies of the ISCO (innermost stable circular orbits along geodesics) and unstable orbits on the value of the electric charge of the rotating regular black hole have been shown. Energy extraction from the rotating regular black hole through various processes has been examined. We have found expression of the center of mass energy for the colliding neutral particles coming from infinity, based on the BSW (Ba\v{n}ados-Silk-West) mechanism. The electric charge $Q$ of rotating regular black hole decreases the potential of the gravitational field and the particle needs less bound energy at the circular geodesics. This causes the increase of efficiency of the energy extraction through BSW process in the presence of the electric charge $Q$ from rotating regular black hole. It has been shown that the efficiency of the energy extraction from the rotating regular black hole via the Penrose process decreases with the increase of the electric charge $Q$ and is smaller with compare to 20.7% which is the value for the extreme Kerr black hole with the specific angular momentum $a=1$.