Publication date: Nov 2017
Abstract:
We study ultrahigh-energy particle collisions and optical effects in the
extraordinary class of mining braneworld Kerr-Newman (KN) naked
singularity spacetimes, predicting extremely high efficiency of
Keplerian accretion, and compare the results to those related to the
other classes of the KN naked singularity and black hole spacetimes. We
demonstrate that in the mining KN spacetimes the ultrahigh center-of-
mass energy occurs for collisions of particles following the extremely-
low-energy stable circular geodesics of the „mining regime,“ colliding
with large family of incoming particles, e.g., those infalling from the
marginally stable counter-rotating circular geodesics. This is
qualitatively different situation in comparison to the standard KN naked
singularity or black hole spacetimes where the collisional ultrahigh
center-of-mass energy can be obtained only in the near-extreme
spacetimes. We also show that observers following the stable circular
geodesics of the mining regime can register extremely blue-shifted
radiation incoming from the Universe, and see strongly deformed sky due
to highly relativistic motion along such stable orbits. The strongly
blue-shifted radiation could be thus a significant source of energy for
such orbiting observers.
Authors:
Stuchlík, Zdeněk; Blaschke, Martin; Schee, Jan;