Energetics and optical properties of $6$-dimensional rotating black hole in pure Gauss-Bonnet gravity

TL;DR

This paper investigates the physical and optical properties of a rotating black hole in pure Gauss-Bonnet gravity, revealing enhanced energy extraction efficiency and altered shadow characteristics compared to Einstein gravity.

Contribution

It provides the first detailed analysis of energetics and optical features of rotating black holes in pure Gauss-Bonnet gravity, highlighting observable differences from Einstein black holes.

Findings

Energy extraction efficiency increased to 25.8%

Particle acceleration increased to 55.28%

Black hole shadow size decreased

Abstract

We study physical processes around a rotating black hole in pure Gauss-Bonnet (GB) gravity. In pure GB gravity, gravitational potential has slower fall off as compared to the corresponding Einstein potential in the same dimension. It is therefore expected that the energetics of pure GB black hole would be weaker, and our analysis bears out that the efficiency of energy extraction by Penrose process is increased to $25.8\%$ and particle acceleration is increased to $55.28\%$, and optical shadow of the black hole is decreased. These are the distinguishing in principle observable features of pure GB black hole.