[Back]

K. Boguslavski, A. Kurkela, T. Lappi, J. Peuron:
"Nonperturbative excitations in overoccupied gluon plasmas";
Talk: 38th International Symposium on Lattice Field Theory, Zoom/Gather at MIT; 2021-07-26 - 2021-07-31.

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 and linear response theory. 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.

https://indico.cern.ch/event/1006302/contributions/4371023/