Magnetic Penrose Process and Kerr Black Hole Mimickers

TL;DR

This paper explores the efficiency of the magnetic Penrose process in various regular black hole geometries, revealing how spin, charge, and magnetic fields influence energy extraction, with notable results for the rotating Hayward black hole.

Contribution

It provides a comparative analysis of energy extraction efficiency across Kerr, Simpson-Visser, and rotating Hayward black holes, highlighting the influence of physical parameters and magnetic fields.

Findings

Efficiency is similar for Kerr and Simpson-Visser geometries regardless of regularization.

Rotating Hayward black holes show higher efficiency influenced by spin, charge, and magnetic fields.

Efficiency peaks in rotating Hayward black holes with minimal magnetic field and charge.

Abstract

The present study investigates the negative energy orbits and energy extraction efficiency using the magnetic Penrose process in various regular black hole geometries surrounded by electromagnetic fields. Utilizing numerical simulations, we analyze the efficiency of this process in Kerr and Simpson-Visser geometries, focusing on extremal black holes. Interestingly, our study demonstrates that the energy extraction efficiency remains indistinguishable between Kerr and Simpson-Visser geometries, regardless of the regularization parameter ($l$); this trend is consistent with previous studies of the Penrose process and superradiance. Additionally, we present results for the rotating Hayward black hole, showing that efficiency is influenced by spin and deviation parameters ($g$), as well as the induced magnetic field and charge of the compact object. Notably, we observe that energy extraction efficiency is highest in the rotating Hayward black hole compared to Kerr and Simpson-Visser geometries, particularly in scenarios where the magnetic field and charge are minimal. Our study highlights the significant role of spin, charge and magnetic field characteristics in maximizing energy extraction efficiency, particularly in the rotating Hayward black hole context.