Coherent Radiation in Gamma-Ray Bursts and Relativistic Collisionless Shocks

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 [$\sim 10^{12}$ 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.

6 pages, accepted for publication in Progress of Theoretical Physics

References in corpus (3)

• Gamma-Ray Bursts: Progress, Problems & Prospects
• Saturation mechanism of the Weibel instability in weakly magnetized plasmas
• Photon Emission in a Cascade from Relativistic Protons Initiated by Residual Thermal Photons in Gamma-Ray Bursts

Cited by in corpus (3)

• Efficiency Crisis of Swift Gamma-Ray Bursts with Shallow X-ray Afterglows: Prior Activity or Time-Dependent Microphysics?
• A cosmic Zevatron based on cyclotron auto-resonance
• Jitter Mechanism as a Kind of Coherent Radiation: Constrained by the GRB 221009A Emission at 18 TeV