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arXiv 0812.4041astro-ph
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自旋黑洞周围中微子湮灭的效率

Efficiency of Neutrino Annihilation around Spinning Black Holes

Ivan Zalamea, Andrei M. Beloborodov

摘要:

一小部分来自伽玛射线暴吸积盘的中微子在吸积盘上方湮灭,产生的e+等离子体可以驱动伽玛射线暴爆炸。我们使用最近详细的克尔黑洞周围的超吸积盘模型计算这种湮灭的效率。我们的计算是完全相对论性的,并基于测地线跟踪方法。我们发现,效率是一个定义良好的函数(1)吸积率和(2)自旋的黑洞。它实际上与中微子在盘的不透明区的输运细节无关。这一结果有助于确定中微子辐射能驱动伽玛暴的吸积盘。

英文摘要:

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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