Strong Relativistic Collisionless Shock

Details Strong Relativistic Collisionless Shock Strong Relativistic Collisionless Shock

2001-11-16

arxiv.org/abs/astro-ph/0111321v1

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures, submitted to ApJL

Scientific paper

A direct numerical simulation of a strong relativistic collisionless shock propagating into an unmagnetized medium has been performed in two spatial dimensions. It is found that: (i) collisionless shock exists, (ii) particle acceleration is insignificant, (iii) the shock does not generate ``quasi-static'' magnetic fields, contrary to recent claims by other authors. All our results agree with a simple plasma-physical model of collisionless shocks. On the other hand, astrophysical evidence indicates that shocks do accelerate charged particles, and GRB phenomenology indicates that shocks do generate strong magnetic fields. The conflict between the simplest plasma-physical model and astronomical observations of collisionless shocks is discussed.

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