Collision of two general particles around a rotating regular Hayward's black holes

Muhammed Amir, Fazlay Ahmed, Sushant G. Ghosh
2016 European Physical Journal C: Particles and Fields  
The rotating regular Hayward's spacetime, apart from mass (M) and angular momentum (a), has an additional deviation parameter (g) due to the magnetic charge, which generalizes the Kerr black hole when g≠0, and for g=0, it goes over to the Kerr black hole. We analyze how the ergoregion is affected by the parameter g to show that the area of ergoregion increases with increasing values of g. Further, for each g, there exist critical a_E, which corresponds to a regular extremal black hole with
more » ... erate horizons r=r^E_H, and a_E decrease whereas r^E_H increases with an increase in the parameter g. Banãdos, Silk and West (BSW) demonstrated that the extremal Kerr black hole can act as a particle accelerator with arbitrarily high center-of-mass energy (E_CM) when the collision of two particles takes place near the horizon. We study the BSW process for two particles with different rest masses, m_1 and m_2, moving in the equatorial plane of extremal Hayward's black hole for different values of g, to show that E_CM of two colliding particles is arbitrarily high when one of the particles takes a critical value of angular momentum. For a nonextremal case, there always exist a finite upper bound for the E_CM, which increases with the deviation parameter g. Our results, in the limit g → 0, reduces to that of the Kerr black hole.
doi:10.1140/epjc/s10052-016-4365-5 fatcat:7x5d76kg7ze5jif65yjgmq4vnm