# On particle collisions near rotating black holes

*A.A. Grib*^{1} and Yu.V. Pavlov^{2}

(1) A. Friedmann Laboratory for Theoretical Physics, Griboedov kanal 30/32, St. Petersburg 191023, Russia

(2) A. Friedmann Laboratory for Theoretical Physics, Griboedov kanal 30/32, St. Petersburg 191023, Russia

### Abstract

Scattering of particles with different masses and energy in the gravitational field of rotating black holes is considered both outside and inside the black hole. Expressions for scattering energy of particles in the center-of-mass reference frame are obtained. It is shown that the scattering energy of particles in this frame can acquire very large values not only for extremal black holes but also for non-extremal ones if one takes into account multiple scattering. Numerical estimates for the time needed for a particle to get ultrarelativistic energy are given.

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