Near-horizon particle collisions along the axis of a rotating electrovacuum black hole
Presenting author: Filip Hejda
It has been known that high energy collisions can occur for radially moving charged test particles in the extremal Reissner-Nordström spacetime, if the collision point is close to the horizon. This is an analogy of the so called Bañados-Silk-West effect, first described for extremal Kerr black holes. We study the motion of charged test particles along the axis of a general extremal rotating electrovacuum black hole. We show that it has similar features as the radial motion in Reissner-Nordstöm spacetime, including the possibility of high-energy collisions. Using this similarity, we study possibilities of energy extraction from collisions in the vicinity of the horizon.