A Novel Approach to Non linear Shock Acceleration

Details A Novel Approach to Non linear Shock Acceleration A Novel Approach to Non linear Shock Acceleration

2001-11-28

arxiv.org/abs/astro-ph/0111529v1

Nucl.Phys.Proc.Suppl. 110 (2002) 475-477

Astronomy and Astrophysics

Astrophysics

To appear in the proceedings of the TAUP conference, September 8-12, 2001 - Gran Sasso Laboratory, Italy

Scientific paper

First order Fermi acceleration at astrophysical shocks is often invoked as a mechanism for the generation of non-thermal particles. This mechanism is especially simple in the approximation that the accelerated particles behave like test particles, not affecting the shocked fluid. Many complications enter the calculations when the accelerated particles have a backreaction on the fluid, in which case we may enter the non linear regime of shock acceleration. In this paper we summarize the main features of a semi-analytical approach to the study of the non linearity in shock acceleration, and compare some of the results with previous attempts and with the output of numerical simulations.

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