Acceleration of particles in Einstein-Maxwell-dilaton black holes

Abstract

It has recently been pointed out that, under certain conditions, the energy\nof particles accelerated by black holes in the center-of-mass frame can become\narbitrarily high. In this paper, we study the collision of two particles in the\ncase of four-dimensional charged nonrotating, extremal charged rotating and\nnear-extremal charged rotating Kaluza-Klein black holes as well as the naked\nsingularity case in Einstein-Maxwell-dilaton theory. We find that the\ncenter-of-mass energy for a pair of colliding particles is unlimited at the\nhorizon of charged nonrotating Kaluza-Klein black holes, extremal charged\nrotating Kaluza-Klein black holes and in the naked singularity case.\n