  We consider two ultrarelativistic shock waves propagating and colliding in
five-dimensional Anti-de-Sitter spacetime. By transforming to Rosen
coordinates, we are able to find the form of the metric shortly after the
collision. Using holographic renormalization, we calculate the energy-momentum
tensor on the boundary of AdS space for early times after the collision. Via
the gauge-gravity duality, this gives some insights on bulk dynamics of systems
created by high energy scattering in strongly coupled gauge theories. We find
that Bjorken boost-invariance is explicitely violated at early times and we
obtain an estimate for the thermalization time in this simple system.
