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Role of radiation reaction forces in the dynamics of centrifugally accelerated particles

Eugene Kharadze Georgian National Astrophysical Observatory, 2a Kazbegi Avenue, Tbilisi-0160, Georgia.
and Ivane Javakhishvili Tbilisi State University, Faculty of Natural and Exact Sciences, Physics Department, 3, Chavchavadze Avenue, 0128 Tbilisi, Georgia

Centre for Plasma Astrophysics, K.U. Leuven, Celestijnenlaan 200B, 3001 Leuven, Belgium,
and Abdus Salam International Centre for Theoretical Physics, Trieste I-34014, Italy

Graduate School of Frontier Sciences, University of Tokyo, 5-1-5-Kashiwanoha, Kashiwa-shi, Chiba 277-8561, Japan,
and Institute of Physics, 6 Tamarashvili Street., 0177 Tbilisi, Georgia

^*On leave from Eugene Kharadze Georgian National Astrophysical Observatory, Kazbegi Avenue, Tbilisi-0160, GA. Andria.Rogava@wis.kuleuven.be

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Phys. Rev. D 76, 045003 – Published 10 August, 2007

DOI: https://doi.org/10.1103/PhysRevD.76.045003

Abstract

In this paper we study the influence of radiation reaction (RR) forces on the dynamics of centrifugally accelerated particles. It is assumed that the particles move along magnetic field lines anchored in the rotating central object. The common “bead-on-the-wire” approximation is used. The solutions are found and analyzed for cases when the form of the prescribed trajectory (rigidly rotating field line) is approximated by: (a) straight line, and (b) Archimedes spiral. Dynamics of neutral and charged particles are compared with the emphasis on the role of RR forces in the latter case. It is shown that for charged particles there exist locations of stable equilibrium. It is demonstrated that for particular initial conditions RR forces cause centripetal motion of the particles: their “falling” on the central rotating object. It is found that in the case of Archimedes spiral both neutral and charged particles can reach infinity where their motion has asymptotically force-free character. The possible importance of these processes for the acceleration of relativistic, charged particles by rotating magnetospheres in the context of the generation of nonthermal, high-energy emission of AGN and pulsars is discussed.

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Role of radiation reaction forces in the dynamics of centrifugally accelerated particles

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