Broad excitations in a 2+1D overoccupied gluon plasma

Journal of High Energy Physics

J. Peuron¹  T. Lappi²  A. Kurkela³  K. Boguslavski⁴ 

[1] Departmen of Astronomy and Theoretical Physics, Sölvegatan 14A, S-223 62, Lund, Sweden;European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT*) and Fondazione Bruno Kessler, Villa Tambosi, Strada delle Tabarelle 286, I-38123, Villazzano (TN), Italy;Department of Physics, University of Jyväskylä, P.O. Box 35, 40014, Jyväskylä, Finland;Helsinki Institute of Physics, University of Helsinki, P.O. Box 64, 00014, Helsinki, Finland;Faculty of Science and Technology, University of Stavanger, Kjell Arholms gate 41, 4021, Stavanger, Norway;Institute for Theoretical Physics, Technische Universität Wien, Wiedner Hauptstrasse 8-10/136, 1040, Wien, Austria;

关键词: Lattice QCD;    Quark-Gluon Plasma;    Perturbative QCD;   

DOI  :  10.1007/JHEP05(2021)225

来源: Springer

【 摘 要 】

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.

【 授权许可】

CC BY