Electric Penrose process and the accretion disk around a 4D charged Einstein-Gauss-Bonnet black hole

TL;DR

This paper investigates how the Gauss-Bonnet coupling parameter and black hole charge influence energy extraction via the electric Penrose process and the radiation properties of accretion disks around a 4D charged Einstein-Gauss-Bonnet black hole, revealing enhanced efficiency and radiation effects.

Contribution

It introduces the impact of the Gauss-Bonnet coupling parameter on energy extraction efficiency and accretion disk radiation in 4D Einstein-Gauss-Bonnet black holes, highlighting their significance.

Findings

GB coupling parameter significantly affects energy extraction efficiency.

Black hole charge enhances energy extraction via Coulomb force.

Radiation parameters increase near the black hole due to GB effects.

Abstract

In this paper, we aim to examine the electric Penrose process (PP) around a charged black hole in 4D Einstein-Gauss-Bonnet (EGB) gravity and bring out the effect of the Gauss-Bonnet (GB) coupling parameter $\alpha$ and black hole charge on the efficiency of the energy extraction from the black hole. This research is motivated by the fact that electrostatic interactions significantly influence the behavior of charged particles in the vicinity of a charged static black hole. Under this interaction, decaying charged particles can have negative energies, causing energy to be released from black holes with no ergosphere. We show that the GB coupling parameter has a significant impact on the energy efficiency of the electric PP, but the efficiency can be strongly enhanced by the black hole charge due to the Coulomb force. Finally, we consider the accretion disk around the black hole and investigate in detail its radiation properties, such as the electromagnetic radiation flux, the temperature, and the differential luminosity. We show that the GB coupling parameter can have a significant impact on the radiation parameters, causing them to increase in the accretion disk in the vicinity of the black hole. Interestingly, it is found that the 4D EGB charged black hole is more efficient and favorable for the accretion disk radiation compared to a charged black hole in Einstein gravity.