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We numerically simulate gravitational shock wave collisions in a holographicmodel dual to a non-conformal four-dimensional gauge theory. We find two noveleffects associated to the non-zero bulk viscosity of the resulting plasma.First, the hydrodynamization time increases. Second, if the bulk viscosity islarge enough then the plasma becomes well described by hydrodynamics before theenergy density and the average pressure begin to obey the equilibrium equationof state. We discuss implications for the quark-gluon plasma created in heavyion collision experiments.

Holographic Collisions in Non-conformal Theories