Zalamea 2008 中微子湮灭的效率--看是否能作为伽玛暴的能源机制

主要内容:
如果吸积率足够高, 貌似就是可以的.

公式:
epislon = 0.05 (M_dot/M_sun s^-1)^5/4
其中效率epsilon定义为 L_GRB/L_tot, 前者是可湮灭的, 后者是中微子的总能量.
比如吸积率为1太阳质量每秒, 效率1/20, 也差不多啦. 前提是a=0.95, 表示黑洞的旋转的.

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Title:		Efficiency of Neutrino Annihilation around Spinning Black Holes
Authors:		Zalamea, Ivan; Beloborodov, Andrei M.
Publication:		eprint arXiv:0812.4041
Publication Date:		12/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		3 pages, 4 figures, to appear in the proceedings of the 6th Huntsville Gamma-Ray Burst Symposium 2008
Bibliographic Code:		2008arXiv0812.4041Z

Abstract

A fraction of neutrino emission from GRB accretion disks annihilates above the disk, creating e+- plasma that can drive GRB explosions. We calculate the efficiency of this annihilation using the recent detailed model of hyper-accretion disks around Kerr black holes. Our calculation is fully relativistic and based on a geodesic-tracing method. We find that the efficiency is a well-defined function of (1) accretion rate and (2) spin of the black hole. It is practically independent of the details of neutrino transport in the opaque zone of the disk. The results help identify the accretion disks whose neutrino emission can power GRBs.

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