Speaker
Kirill Boguslavski
(Vienna University of Technology (AT))
Description
Motivated by the early-time dynamics of the quark-gluon plasma in high-energy heavy-ion collisions, we extract gluonic spectral functions of overoccupied gauge theories far from equilibrium using classical-statistical lattice simulations. In 3+1 dimensions we find that the spectral function exhibits quasiparticle excitations at all momenta that are mostly consistent with perturbative hard-thermal loop predictions, while partially showing nonperturbative deviations. In contrast, the structure of excitations in 2+1 dimensions is nontrivial and nonperturbative. These nonperturbative interactions lead to broad excitation peaks in the spectral function, demonstrating the absence of soft quasiparticles in these theories.
Authors
Kirill Boguslavski
(Vienna University of Technology (AT))
Eero Aleksi Kurkela
(University of Stavanger (NO))
Tuomas Lappi
(University of Jyvaskyla)
Jarkko Peuron
(Lund University)
