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A new feature of the rotating black holes is the existence in theirergosphere of trajectories of particles with negative and zero energies. Herewe analyze general properties of such trajectories comparing them with usualtrajectories of particles with positive energy. A comparison with the situationin rotating coordinate frame in Minkowski space-time is made. The possibilityof the unbounded growth of the energy of two colliding particles in the centreof mass frame in the ergosphere is analysed.

Properties of particles in the ergosphere of black holes