Broad excitations in a 2+1D overoccupied gluon plasma

Abstract

Motivated by the initial stages of high-energy heavy-ion collisions, we study excitations of far-from-equilibrium 2+1 dimensional gauge theories using classical-statistical lattice simulations. We evolve field perturbations over a strongly overoccupied background undergoing self-similar evolution. While in 3+1D the excitations are described by hard-thermal loop theory, their structure in 2+1D is nontrivial and nonperturbative. These nonperturbative interactions lead to broad excitation peaks in spectral and statistical correlation functions. Their width is comparable to the frequency of soft excitations, demonstrating the absence of soft quasiparticles in these theories. Our results also suggest that excitations at higher momenta are sufficiently long-lived, such that an effective kinetic theory description for 2+1 dimensional Glasma-like systems may exist, but its collision kernel must be nonperturbatively determined.

arXiv comment33 pages, 11 figures; v2: extended Introduction and Conclusion, references added, published version

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• The imaginary part of the heavy-quark potential from real-time Yang-Mills dynamics
• Soft-gluon exchange matters: isotropic screening in QCD kinetic theory
• Real-time correlators in 3+1D thermal lattice gauge theory
• Kelvin waves in nonequilibrium universal dynamics of relativistic scalar field theories
• Fermion and gluon spectral functions far from equilibrium