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

2015    Abdujabbarov, Ahmadjon; Atamurotov, Farruh; Dadhich, Naresh; Ahmedov, Bobomurat; Stuchlik, Zdenek

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