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Collisional Penrose Process near the Horizon of Extreme Kerr Black Holes

Journal article
Authors M. Bejger
T. Piran
Marek A Abramowicz
Frida Håkansson
Published in Physical Review Letters
Volume 109
Issue 12
Pages artikel nr 121101
ISSN 0031-9007
Publication year 2012
Published at Department of Physics (GU)
Pages artikel nr 121101
Language en
Links dx.doi.org/10.1103/PhysRevLett.109....
https://gup.ub.gu.se/file/86271
Keywords energy, extraction
Subject categories Physical Sciences

Abstract

Collisions of particles in black hole ergospheres may result in an arbitrarily large center-of-mass energy. This led recently to the suggestion [M. Banados, J. Silk, and S. M. West, Phys. Rev. Lett. 103, 111102 (2009)] that black holes can act as ultimate particle accelerators. If the energy of an outgoing particle is larger than the total energy of the infalling particles, the energy excess must come from the rotational energy of the black hole and hence, a Penrose process is involved. However, while the center-of-mass energy diverges, the position of the collision makes it impossible for energetic particles to escape to infinity. Following an earlier work on collisional Penrose processes [T. Piran and J. Shaham, Phys. Rev. D 16, 1615 (1977)], we show that even under the most favorable idealized conditions the maximal energy of an escaping particle is only a modest factor above the total initial energy of the colliding particles. This implies that one should not expect collisions around a black hole to act as spectacular cosmic accelerators.

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