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.
Highlights
Higher order Lovelock terms in the action make a non-zero contribution only in dimensions D > 4
The elemental feature of pure Lovelock gravity is that gravitational dynamics in all odd and even dimensions is similar
That is why it is expected that physical processes and effects around a 6-dimensional rotating pure GB black hole would be similar to that of a 4-dimensional Kerr black hole
Summary
We shall study all usual physical processes like energy extraction, Hawking radiation, optical shadowing, and particle acceleration for a pure GB rotating black hole [27] and compare them to that of a rotating black hole in the usual 4dimensional space-time. This is the primary aim of the paper. Throughout the paper, we use a system of units in which the GB coupling constant and velocity of light are set to unity
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