Ultrahigh energy particle collisions near the black hole horizon in the strong magnetic field

We consider collision between two charged (or charged and neutral) particles near the black hole horizon in the strong magnetic field B. It is shown that there exists a strip near the horizon within which collision of any two such particles leads to ultrahigh energy in the center-of-mass frame (CM frame). The results apply to generic (not necessarily vacuum) black holes. © 2014 World Scientific Publishing Company