On the collisions between particles in the vicinity of rotating black holes

TL;DR

This paper investigates particle collisions near rotating black holes, demonstrating that high-energy scattering and energy extraction are possible even for nonextremal black holes, resolving previous contradictions in the field.

Contribution

It shows that high-energy particle collisions and energy extraction via the Penrose process can occur near both extremal and nonextremal rotating black holes.

Findings

Scattering energy can be very large near rotating black holes.

Energy extraction through the Penrose process is effective.

Contradictions in high-energy particle escape are resolved.

Abstract

Scattering of particles in the gravitational field of rotating black holes is considered. It is shown that scattering energy of particles in the centre of mass system can obtain very large values not only for extremal black holes but also for nonextremal ones. Extraction of energy after the collision is investigated. It is shown that due to the Penrose process the energy of the particle escaping the hole at infinity can be large. Contradictions in the problem of getting high energetic particles escaping the black hole are resolved.