Publication date: Jan 2018
Abstract:
We investigate particle motion and collisions in the vicinity of
rotating black holes immersed in combined cosmological quintessential
scalar field and external magnetic field. The quintessential dark-energy
field governing the spacetime structure is characterized by the
quintessential state parameter ωq ∈ (-1; -1/3) characterizing its
equation of state, and the quintessential field-intensity parameter c
determining the static radius where the black hole attraction is just
balanced by the quintessential repulsion. The magnetic field is assumed
to be test field that is uniform close to the static radius, where the
spacetime is nearly flat, being characterized by strength B there.
Deformations of the test magnetic field in vicinity of the black hole,
caused by the Ricci non-flat spacetime structure are determined. General
expression of the center-of-mass energy of the colliding charged or
uncharged particles near the black hole is given and discussed in
several special cases. In the case of nonrotating black holes, we
discuss collisions of two particles freely falling from vicinity of the
static radius, or one such a particle colliding with charged particle
revolving at the innermost stable circular orbit. In the case of
rotating black holes, we discuss briefly particles falling in the
equatorial plane and colliding in close vicinity of the black hole
horizon, concentrating attention to the interplay of the effects of the
quintessential field and the external magnetic field. We demonstrate
that the ultra-high center-of-mass energy can be obtained for black
holes placed in an external magnetic field for an infinitesimally small
quintessential field-intensity parameter c; the center-of-mass energy
decreases if the quintessential field-intensity parameter c increases.
Authors:
Shaymatov, Sanjar; Ahmedov, Bobomurat; Stuchlík, Zdeněk; Abdujabbarov, Ahmadjon;