Rotating Hayward's regular black hole as particle accelerator
Abstract
Recently, Bañados, Silk and West (BSW) demonstrated that the extremal Kerr black hole can act as a particle accelerator with arbitrarily high centerofmass energy ( E _{CM}) when the collision takes place near the horizon. The rotating Hayward's regular black hole, apart from Mass ( M) and angular momentum ( a), has a new parameter g ( g > 0 is a constant) that provides a deviation from the Kerr black hole. We demonstrate that for each g, with M = 1, there exist critical a _{ E } and r {_{/H } ^{ E }}, which corresponds to a regular extremal black hole with degenerate horizons, and a _{ E } decreases whereas r {_{/H } ^{ E }} increases with increase in g. While a < a _{ E } describe a regular nonextremal black hole with outer and inner horizons. We apply the BSW process to the rotating Hayward's regular black hole, for different g, and demonstrate numerically that the E _{CM} diverges in the vicinity of the horizon for the extremal cases thereby suggesting that a rotating regular black hole can also act as a particle accelerator and thus in turn provide a suitable framework for Plankscale physics. For a nonextremal case, there always exist a finite upper bound for the E _{CM}, which increases with the deviation parameter g.
 Publication:

Journal of High Energy Physics
 Pub Date:
 July 2015
 DOI:
 10.1007/JHEP07(2015)015
 arXiv:
 arXiv:1503.08553
 Bibcode:
 2015JHEP...07..015A
 Keywords:

 Black Holes;
 Classical Theories of Gravity;
 Spacetime Singularities;
 General Relativity and Quantum Cosmology
 EPrint:
 10 pages, 10 figures, 4 tables, accepted to be published in Journal of High Energy Physics