Particle dynamics around a dyonic charged black hole

TL;DR

This paper analyzes particle motion, energy extraction, and the effects of charge and spin around a Kerr-Newman-Kasuya black hole, revealing how these factors influence geodesics and energy efficiency.

Contribution

It provides new insights into particle dynamics, energy extraction limits, and the impact of dyonic charge on black hole properties and processes.

Findings

Charge reduces photon and stable orbit radii.

Black hole rotation and charge increase energy extraction efficiency.

Derived expressions for negative energy states and Penrose process limits.

Abstract

In this article, we study the circular motion of particles and the well-known Penrose mechanism around a Kerr-Newman-Kasuya black hole spacetime. The inner and outer horizons, as well as ergosurfaces of the said black hole, are briefly examined under the effect of spin and dyonic charge. Moreover, by limiting our exploration to the equatorial plane, we discuss the characteristics of circular geodesics and investigate both photons, as well as marginally stable circular orbits. It is noted that black hole charge diminishing the radii of photon and marginally stable circular orbits. To investigate the nature of particle dynamics, we studied the effective potential and Lyapunov exponent. While inspecting the process of energy extraction, we derived the Wald inequality, which can help us to locate the energy limits of the Penrose process. Furthermore, we have found expressions for the negative energy states and the efficiency of energy extraction. The obtained result illustrates that both black hole rotation and dyonic charge contributes to the efficiency of energy extraction.