Particle acceleration around a five-dimensional Kerr black hole
In the paper [1] authors have studied the center-ofmass (CM) energy of colliding two particles near the rotating black hole. They observed the divergence of the CM energy in the extreme rotating black hole case with the fine-tuning of the momentum of one of the particles (so called BSW process after the names of the authors - Banados, Silk, and West). The analysis of the CM energy of two colliding particles at the equatorial plane tends to extremely high energies for the extremal central black hole when it rotates with maximal speed and the maximal rotating black hole can be considered as high energy scale collider of normal and dark matter particles which can be detected by the observer at infinity. Since BSW process has been introduced the mechanism of particle acceleration near the black hole has been intensively studied by many of authors for the different space-time metric describing black hole. Authors of the Ref. [2] have studied two particles acceleration, the multiple scattering and their CM energy in case of non extreme rotating black hole. The acceleration mechanism of the particles when they are in the stable circular orbits has been considered in [3]. Recent studies have shown that the naked singularities that are formed due to the gravitational collapse of massive stars provide a suitable environment where particles could get accelerated and collide at arbitrarily high center-of-mass energies [4–7]. Authors of Ref. [8] studied the collision of two particles with the different rest masses moving in the equatorial plane in a Kerr-Taub-NUT spacetime and found that the CM energy depends not only on the rotation parameter,