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K. Boguslavski:
"Broad excitations in a 2+1D overoccupied gluon plasma";
Vortrag: FunQCD 2021: from first principles to effective theories, Virtual conference (eingeladen); 29.03.2021 - 01.04.2021.

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. While in 3+1D the gluon 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 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.

https://publik.tuwien.ac.at/files/publik_302138.pdf