Rossi 2008 超吸积下的微观物理

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Title:		Microphysical dissipation, turbulence and magnetic fields in hyper-accreting discs
Authors:		Rossi, Elena M.; Armitage, Philip J.; Menou, Kristen
Publication:		eprint arXiv:0807.3547
Publication Date:		07/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		14 pages, 10 figures. MNRAS, submitted
Bibliographic Code:		2008arXiv0807.3547R

Abstract

Hyper-accreting discs occur in compact-object mergers and collapsars, and may power gamma-ray bursts (GRBs). We calculate the microscopic viscosity and resistivity of plasma in these discs, and discuss the implications for their global structure and evolution. In the neutrino-cooled innermost regions, the viscosity is provided mainly by mildly degenerate electrons, while the resistivity is modified from the Spitzer value due to the effects of both relativity and degeneracy. The plasma behaves as an almost ideal MHD fluid. Among the non-ideal MHD effects the Hall term is relatively the most important, while the magnetic Prandtl number, Pr (the ratio of viscosity to resistivity), is typically larger than unity: 10 <>

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