On the Source and Location of Temporal Variability in Fireballs
Shaviv, Nir J.
Original · EN
Most cosmological models for gamma-ray bursts invoke the production of a ``fireball'' in a compact region, as indicated by the short time variability of the observed GRBs. The high density of e+e- pairs in such fireballs inevitably makes them opaque to gamma-rays and requires the gamma-ray emission to take place only after the fireball has expanded and became optically thin to gamma's. Many of the ``traditional'' scenarios explain the temporal variability of GRBs as being formed by growing instabilities in the expanding fireball. Here we explore this possiblity and examine its validity.
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