Spectral function for overoccupied gluodynamics from real-time lattice simulations

Understand

We study the spectral properties of a highly occupied non-Abelian non-equilibrium plasma appearing ubiquitously in weak coupling descriptions of QCD matter.

• The spectral function of this far-from-equilibrium plasma is measured by employing linear response theory in classical-statistical real-time lattice Yang-Mills simulations.
• We establish the existence of transversely and longitudinally polarized quasiparticles and obtain their dispersion relations, effective mass, plasmon frequency, damping rate and further structures in the spectral and statistical functions.
• Our new method can be interpreted as a non-perturbative generalization of hard thermal loop (HTL) effective theory.