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    Orbital widening due to radiation reaction around a magnetized black hole

    Zdeněk Stuchlík · Červen 01, 2018 · Fyzika · 0 comments
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    Publication date: Jun 2018

    Abstract:
    Radiation reaction acting on a charged particle moving at a stable
    circular orbit of a magnetized black hole (BH) can lead to the shift of
    the orbital radius outward from the BH. The effect causes an increase of
    the energy and angular momentum of the particle measured by an observer
    at rest at infinity. In this paper, we show that „widening“ of such
    orbits is independent of the field configuration, but it appears only in
    the cases with the external Lorentz force acting outward from the BH.
    This condition corresponds to qLB > 0, where q and L are the charge
    and angular momentum of the particle, and B is intensity of the external
    magnetic field. As examples of the orbital widening, we consider two
    scenarios with an external homogeneous magnetic field and a magnetic
    dipole field generated by a current loop around a Schwarzschild BH. We
    show that the orbital widening is accompanied by quasi-harmonic
    oscillations of the particle, which are considerably large in the
    magnetic dipole fields. We also estimate the timescales of orbital
    widening, from which it follows that the effect can be relevant in the
    vicinity of stellar-mass BHs.

    Authors:
    Tursunov, A. A.; Kološ, M.; Stuchlík, Z.;

    https://ui.adsabs.harvard.edu/abs/2018AN….339..341T

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