Circular geodesics in Kerr-Newman-Kasuya black hole

TL;DR

This paper analyzes how spin and dyonic charge influence the structure and properties of Kerr-Newman-Kasuya black holes, focusing on ergoregions, horizons, and circular geodesics, with comparisons to Kerr and Schwarzschild black holes.

Contribution

It provides a detailed investigation of the effects of electric and magnetic charges on the black hole's horizons and ergoregion, including photon orbits and particle angular velocities.

Findings

Electric and magnetic charges decrease horizon and static limit radii.

Charges increase the ergoregion area.

Photon circular orbits and particle angular velocities are characterized.

Abstract

This article explores the characteristics of ergoregion, horizons and circular geodesics around a Kerr-Newman-Kasuya black hole. We investigate the effect of spin and dyonic charge parameters on ergoregion, event horizon and static limit surface of the said black hole. We observed that both electric, as well as magnetic charge parameters, results in decreasing the radii of event horizon and static limit, whereas increasing the area of ergoregion. The obtained results are compared with that acquired from Kerr and Schwarzschild black holes. Moreover, we figured out the photons orbit of circular null geodesics and studied the angular velocity of a particle within ergoregion.