Energetics and optical properties of 6-dimensional rotating black hole in pure Gauss–Bonnet gravity
Ahmadjon Abdujabbarov (Ulugh Beg Astronomical Institute, Astronomicheskaya 33, 100052, Tashkent, Uzbekistan, Institute of Nuclear Physics, Ulughbek, 100214, Tashkent, Uzbekistan); Farruh Atamurotov (Institute of Nuclear Physics, Ulughbek, 100214, Tashkent, Uzbekistan, Inha University in Tashkent, 100170, Tashkent, Uzbekistan); Naresh Dadhich (Centre for Theoretical Physics, Jamia Millia Islamia, 110025, New Delhi, India, Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, 411 007, Pune, India); Bobomurat Ahmedov (Ulugh Beg Astronomical Institute, Astronomicheskaya 33, 100052, Tashkent, Uzbekistan, Institute of Nuclear Physics, Ulughbek, 100214, Tashkent, Uzbekistan); Zdeněk Stuchlík (Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava, Bezrucovo nam. 13, Opava, Czech Republic)
We study physical processes around a rotating black hole in pure GaussâBonnet (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 Penroseprocess is increased to 25.8Â % and the particle acceleration is increased to 55.28Â %; the optical shadow of the black hole is decreased. These are in principle distinguishing observable features of a pure GB black hole.