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@article{30091, author = {Tursunov, Arman and Kološ, Martin and Stuchlík, Zdeněk}, article_number = {5}, doi = {http://dx.doi.org/10.1002/asna.201813502}, keywords = {black hole physics; magnetic fields; radiation mechanism: nonthermal; relativity}, language = {eng}, issn = {0004-6337}, journal = {Astronomische Nachrichten}, title = {Orbital widening due to radiation reaction around a magnetized black hole}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/asna.201813502}, volume = {339}, year = {2018} }
TY - JOUR ID - 30091 AU - Tursunov, Arman - Kološ, Martin - Stuchlík, Zdeněk PY - 2018 TI - Orbital widening due to radiation reaction around a magnetized black hole JF - Astronomische Nachrichten VL - 339 IS - 5 SP - 341-346 EP - 341-346 SN - 00046337 KW - black hole physics KW - magnetic fields KW - radiation mechanism: nonthermal KW - relativity UR - https://onlinelibrary.wiley.com/doi/abs/10.1002/asna.201813502 L2 - https://onlinelibrary.wiley.com/doi/abs/10.1002/asna.201813502 N2 - 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. ER -
TURSUNOV, Arman, Martin KOLOŠ a Zdeněk STUCHLÍK. Orbital widening due to radiation reaction around a magnetized black hole. \textit{Astronomische Nachrichten}. 2018, roč.~339, č.~5, s.~341-346. ISSN~0004-6337. Dostupné z: https://dx.doi.org/10.1002/asna.201813502.
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