On particle collisions in the gravitational field of the Kerr black hole

TL;DR

This paper analyzes particle collisions near Kerr black holes, demonstrating that extremely high energies can be achieved in such events, potentially explaining ultrahigh energy cosmic rays and energy extraction mechanisms.

Contribution

It shows that high-energy particle collisions are possible in both extremal and nonextremal Kerr black holes, and explores energy extraction via the Penrose process.

Findings

High collision energies near Kerr black holes.

Potential explanation for ultrahigh energy cosmic rays.

Feasibility of energy extraction through Penrose process.

Abstract

Scattering of particles in the gravitational field of Kerr 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 existing in Nature. This can be used for explanation of still unresolved problem of the origin of ultrahigh energy cosmic rays observed in Auger experiment. 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.