Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1000..369m&link_type=abstract
GAMMA-RAY BURSTS 2007: Proceedings of the Santa Fe Conference. AIP Conference Proceedings, Volume 1000, pp. 369-372 (2008).
Physics
Gamma-Ray Sources, Gamma-Ray Bursts, Shock Waves And Discontinuities, Cosmic Rays, Radiation Mechanisms, Polarization
Scientific paper
Radiation from GRBs, either in the prompt phase or seen as flares or an afterglow, is believed to be produced at shocks by accelerated electrons in magnetic fields. However, there are alternatives, at least for the prompt and flares, namely the magnetically dominated and Poynting flux driven outflows, where no shocks presumably form at all. The outflow properties are intimately linked to the central engine/progenitor hence, to understand the nature of the outflow is of great importance. Here we review the present status of the ``standard model of GRBs''-the model with internal/external shocks. We briefly discuss two alternative models of the magnetic field generation at shocks: the model based on the Weibel instability and the recently proposed one based on the generation of vorticity at a shock. We also address the electron energization/acceleration mechanisms (including non-Fermi) in both models. The observational predictions for the spectral and temporal dynamics of the produced radiation have been elaborated as well; these include: (i) the Jitter radiation and spectral variability in the Weibel model and (ii) the time-evolving magnetic equipartition parameter in the vorticity model. The predictions appear to be quite different and this provides certain hope that they can allow to differentiate between the models.
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