TURSUNOV, Arman, Martin KOLOŠ and Zdeněk STUCHLÍK. Orbital widening due to radiation reaction around a magnetized black hole. Astronomische Nachrichten. 2018, vol. 339, No 5, p. 341-346. ISSN 0004-6337. Available from: https://dx.doi.org/10.1002/asna.201813502.
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Basic information
Original name Orbital widening due to radiation reaction around a magnetized black hole
Authors TURSUNOV, Arman (860 Uzbekistan, guarantor, belonging to the institution), Martin KOLOŠ (203 Czech Republic, belonging to the institution) and Zdeněk STUCHLÍK (203 Czech Republic, belonging to the institution).
Edition Astronomische Nachrichten, 2018, 0004-6337.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10308 Astronomy
Country of publisher Germany
Confidentiality degree is not subject to a state or trade secret
WWW URL
RIV identification code RIV/47813059:19240/18:A0000260
Organization unit Faculty of Philosophy and Science in Opava
Doi http://dx.doi.org/10.1002/asna.201813502
UT WoS 000444072500005
Keywords in English black hole physics; magnetic fields; radiation mechanism: nonthermal; relativity
Tags International impact, Reviewed
Links GB14-37086G, research and development project. GJ16-03564Y, research and development project.
Changed by Changed by: RNDr. Arman Tursunov, Ph.D., učo 39715. Changed: 23/4/2020 14:08.
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.
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