Publication date: May 2015
Abstract:
The neutral particle motion around rotating regular black hole that was
derived from the Ayón-Beato-García (ABG) black hole
solution by the Newman-Janis algorithm in the preceding paper (Toshmatov
et al., Phys. Rev. D, 89:104017, 2014) has been studied. The
dependencies of the ISCO (innermost stable circular orbits along
geodesics) and unstable orbits on the value of the electric charge of
the rotating regular black hole have been shown. Energy extraction from
the rotating regular black hole through various processes has been
examined. We have found expression of the center of mass energy for the
colliding neutral particles coming from infinity, based on the BSW
(Baňados-Silk-West) mechanism. The electric charge Q of rotating
regular black hole decreases the potential of the gravitational field as
compared to the Kerr black hole and the particles demonstrate less bound
energy at the circular geodesics. This causes an increase of efficiency
of the energy extraction through BSW process in the presence of the
electric charge Q from rotating regular black hole. Furthermore, we have
studied the particle emission due to the BSW effect assuming that two
neutral particles collide near the horizon of the rotating regular
extremal black hole and produce another two particles. We have shown
that efficiency of the energy extraction is less than the value 146.6 %
being valid for the Kerr black hole. It has been also demonstrated that
the efficiency of the energy extraction from the rotating regular black
hole via the Penrose process decreases with the increase of the electric
charge Q and is smaller in comparison to 20.7 % which is the value for
the extreme Kerr black hole with the specific angular momentum a= M.
Authors:
Toshmatov, Bobir; Abdujabbarov, Ahmadjon; Ahmedov, Bobomurat; Stuchlík, Zdeněk;