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 τ as exp(Γ√(g2μτ)), where g2μ is a scale arising from the saturation of gluons in the nuclear wave function. The scale for the growth rate Γ is set by a plasmon mass, defined as ωpl=κ0√(g2μ/τ), generated dynamically in the collision. We compare the numerical ratio Γ/κ0 to the corresponding value predicted by the hard thermal loop formalism for anisotropic plasmas