We study spectral properties of a highly occupied non-Abelian plasma, which is expected to be created in the weak-coupling picture during the initial stages after a heavy-ion collision. The spectral function of this far-from-equilibrium plasma is measured by employing linear response theory to classical-statistical lattice simulations. We obtain the dispersion relation of the quasi-particles, their effective mass as well as the form of the spectral function in frequency space. Our results are consistent with hard thermal loop effective theory where expected but can be extended beyond the regime of validity of the latter.
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