Collective non-Abelian instabilities in a melting color glass condensate

We present first results for (3+1)D simulations of SU(2) Yang-Mills equations for matter expanding into the vacuum after a heavy ion collision. Violations of boost invariance cause a non-Abelian Weibel instability leading soft modes to grow with proper time tau as exp(Gamma root g(2)mu tau), where g(2)mu is a scale arising from the saturation of gluons in the nuclear wave function. The scale for the growth rate Gamma is set by a plasmon mass, defined as omega(pl)=kappa(0)root g(2)mu/tau, generated dynamically in the collision. We compare the numerical ratio Gamma/kappa(0) to the corresponding value predicted by the hard thermal loop formalism for anisotropic plasmas.