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Coherent Radiation in Gamma-Ray Bursts and Relativistic Collisionless Shocks

Kunihito Ioka

astro-pharXiv:astro-ph/0508498

Abstract

We suggest that coherent radiation may occur in relativistic collisionless shocks via two-stream Weibel instabilities. The coherence amplifies the radiation power by many orders [ 1012 in Gamma-Ray Bursts (GRBs)] and particles cool very fast before being randomized. We imply (1) GRBs accompany strong infrared emission, (2) protons efficiently transfer energy to electrons and (3) prompt GRBs might be the upscattered coherent radiation.

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