Collective non-Abelian instabilities in a melting Color Glass Condensate

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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 Weibel instability leading soft modes to grow with proper time τ as (Γ√g²μτ), where g²μ is a scale arising from the saturation of gluons in the nuclear wavefunction. The scale for the growth rate Γ is set by a plasmon mass, defined as ω pl= κ₀ √g²μτ, 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.