Medvedev 2009 粒子的激波加速

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Title:		Whence particle acceleration
Authors:		Medvedev, M. V.; Spitkovsky, A.
Publication:		eprint arXiv:0906.1087
Publication Date:		06/2009
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		Proceedings of the meeting ``070228 - The Next Decade of GRB Afterglows'' held March 19-23, 2007 in Amsterdam
Bibliographic Code:		2009arXiv0906.1087M

Abstract

We discuss how the electrons in relativistic GRB shocks can reach near-equipartition in energy with the protons. We emphasize the non-Fermi origin of such acceleration. We argue that the dynamics of the electrons in the foreshock region and at the shock front plays an important role. We also demonstrate that PIC simulations can directly probe this physics in the regimes relevant to GRBs.

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Title:		Radiation of electrons in Weibel-generated fields: a general case
Authors:		Medvedev, Mikhail V.
Publication:		eprint arXiv:0906.1090
Publication Date:		06/2009
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		Proceedings of International Conference on HEDP/HEDLA-08
Bibliographic Code:		2009arXiv0906.1090M

Abstract

Weibel instability turns out to be the a ubiquitous phenomenon in High-Energy Density environments, ranging from astrophysical sources, e.g., gamma-ray bursts, to laboratory experiments involving laser-produced plasmas. Relativistic particles (electrons) radiate in the Weibel-produced magnetic fields in the Jitter regime. Conventionally, in this regime, the particle deflections are considered to be smaller than the relativistic beaming angle of 1/$\gamma$ ($\gamma$ being the Lorentz factor of an emitting particle) and the particle distribution is assumed to be isotropic. This is a relatively idealized situation as far as lab experiments are concerned. We relax the assumption of the isotropy of radiating particle distribution and present the extension of the jitter theory amenable for comparisons with experimental data.

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