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>Opaque or transparent? A link between neutrino optical depths and the characteristic duration of short gamma-ray bursts
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Opaque or transparent? A link between neutrino optical depths and the characteristic duration of short gamma-ray bursts
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机译:不透明或透明?中微子光学深度与短伽马射线爆发特征持续时间之间的联系
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摘要
Cosmological gamma ray bursts (GRBs) are thought to occur from violent hypercritical accretion onto stellar mass black holes, either following core collapse in massive stars or compact binary mergers. This dichotomy may be reflected in the two classes of bursts having different durations. Dynamical calculations of the evolution of these systems are essential if one is to establish characteristic, relevant timescales. We show here for the first time the result of dynamical simulations, lasting approximately one second, of post--merger accretion disks around black holes, using a realistic equation of state and considering neutrino emission processes. We find that the inclusion of neutrino optical depth effects produces important qualitative temporal and spatial transitions in the evolution and structure of the disk, which may directly reflect upon the duration and variability of short GRBs.
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