Efficiency of Neutrino Annihilation around Spinning Black Holes

Details Efficiency of Neutrino Annihilation around Spinning Black Holes Efficiency of Neutrino Annihilation around Spinning Black Holes

2008-12-21

arxiv.org/abs/0812.4041v1

AIP Conf.Proc.1133:121-123,2009

Astronomy and Astrophysics

Astrophysics

3 pages, 4 figures, to appear in the proceedings of the 6th Huntsville Gamma-Ray Burst Symposium 2008

Scientific paper

10.1063/1.3155863

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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