Publication date: May 2014
We demonstrate that ultra-high-energy collisions of particles falling
freely from rest at infinity can occur in the field of near-extreme
Kehagias-Sfetsos naked singularities related to the Hořava gravity.
However, the efficiency of escaping of created ultrarelativistic
particles and the energy efficiency of the collisional process relative
to distant observers are significantly lowered due to large
gravitational redshift, which is substantially lower in comparison to
those related to the collisions occurring close to the equatorial plane
of near-extreme Kerr naked-singularity spacetimes. In the Kehagias-
Sfetsos naked-singularity spacetimes, the energy efficiency relative to
distant observers corresponds to the covariant energy of the colliding
particles only. Finally, we demonstrate how the ultra-high-energy
collisions are modified for charged particles if the Kehagias-Sfetsos
naked singularities are immersed in a uniform magnetic field.
Stuchlík, Zdeněk; Schee, Jan; Abdujabbarov, Ahmadjon;