Broad excitations in a 2+1D overoccupied gluon plasma

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Boguslavski , K , Kurkela , A , Lappi , T & Peuron , J 2021 , ' Broad excitations in a 2+1D overoccupied gluon plasma ' , Journal of High Energy Physics , no. 5 , 225 .

Title: Broad excitations in a 2+1D overoccupied gluon plasma
Author: Boguslavski, K.; Kurkela, A.; Lappi, Tuomas; Peuron, Jarkko
Contributor organization: Helsinki Institute of Physics
Date: 2021-05-25
Language: eng
Number of pages: 34
Belongs to series: Journal of High Energy Physics
ISSN: 1029-8479
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.
Subject: 114 Physical sciences
Lattice QCD
Quark-Gluon Plasma
Perturbative QCD
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion

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