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.
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Acknowledgements
The authors acknowledge the project Supporting Integration with the International Theoretical and Observational Research Network in Relativistic Astrophysics of Compact Objects, Grant No. CZ.1.07/2.3.00/ 20.0071, supported by Operational Programme Education for Competitiveness funded by the Structural Funds of the European Union. B. Toshmatov acknowledges the internal student grant of the Silesian University at Opava SGS/23/2013. Z. Stuchlík acknowledges the Albert Einstein Center for gravitation and astrophysics supported by the Czech Science Foundation Grant No. 14-37086G. A. Abdujabbarov and B. Ahmedov thank the Goethe University, Frankfurt am Main, Germany, and the Faculty of Philosophy and Science, Silesian University in Opava, Czech Republic, for the warm hospitality. This research is supported in part by Grants No. F2-FA-F113, No. EF2-FA-0-12477, and No. F2-FA-F029 of the UzAS, and by the ICTP through Grant No. OEA-PRJ-29 and No. OEA-NET-76 and by the Volkswagen Stiftung, Grant No. 86 866.
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Toshmatov, B., Abdujabbarov, A., Ahmedov, B. et al. Particle motion and Penrose processes around rotating regular black hole. Astrophys Space Sci 357, 41 (2015). https://doi.org/10.1007/s10509-015-2289-4
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DOI: https://doi.org/10.1007/s10509-015-2289-4