Acceleration of particles by nonrotating charged black holes

Recently, in the series of works a new effect of acceleration of particles by black holes was found. Under certain conditions, the energy in the centre of mass frame can become infinitely large. The essential ingredient of such effect is the rotation of a black hole. In the present Letter, we argue that the similar effect exists for a nonrotating but charged black hole even for the simplest case of radial motion of particles in the Reissner–Nordström background. All main features of the effect under discussion due to rotating black holes have their counterpart for the nonrotating charged ones.