In this talk, I will discuss numerical simulations of relativistic jets in
massive stars in the context of the collapsar model for long soft gamma-ray
bursts. The propagation and breakout of such jets are examined in
multi-dimensional special relativistic hydrodynamical simulations. During
its propagation, the jet is collimated by the passage through the stellar
mantle. As it erupts, the highlyrelativistic jet core is surrounded by a cocoon of less energetic, but
still moderately relativistic ejecta that expands and becomes visible at
larger polar angles. Implications for both the observations and the models
which generate the jets are discussed.
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