  Recently, a lot of effort has been put into describing the thermalization of
the quark-gluon plasma using the gauge/gravity duality. In this context we here
present a full numerical solution of the early far-from-equilibrium formation
of the plasma, which is expanding radially in the transverse plane and is boost
invariant along the collision axis. This can model the early stage of a head-on
relativistic heavy ion collision. The resulting momentum distribution quickly
reaches local equilibrium, after which they can be evolved using ordinary
hydrodynamics. We comment on general implications for these hydrodynamic
simulations, both for central and non-central collisions, and including
fluctuations in the initial state.
