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    Effect of an external magnetic field on particle acceleration by a rotating black hole surrounded with quintessential energy

    Zdeněk Stuchlík · Leden 01, 2018 · Fyzika · 0 comments
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    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;

    https://ui.adsabs.harvard.edu/abs/2018IJMPD..2750088S

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