Relativistic particle acceleration in developing Alfvén turbulence

Details Relativistic particle acceleration in developing Alfvén turbulence Relativistic particle acceleration in developing Alfvén turbulence

2009-12-11

arxiv.org/abs/0912.2154v1

ApJ, Vol. 692, pp.1004 (2009)

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

15 pages, 9 figures, 1 table

Scientific paper

10.1088/0004-637X/692/2/1004

A new particle acceleration process in a developing Alfv\'{e}n turbulence in the course of successive parametric instabilities of a relativistic pair plasma is investigated by utilyzing one-dimensional electromagnetic full particle code. Coherent wave-particle interactions result in efficient particle acceleration leading to a power-law like energy distribution function. In the simulation high energy particles having large relativistic masses are preferentially accelerated as the turbulence spectrum evolves in time. Main acceleration mechanism is simultaneous relativistic resonance between a particle and two different waves. An analytical expression of maximum attainable energy in such wave-particle interactions is derived.

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