A1 Journal article (refereed)
Broad excitations in a 2+1D overoccupied gluon plasma (2021)

Boguslavski, K., Kurkela, A., Lappi, T., & Peuron, J. (2021). Broad excitations in a 2+1D overoccupied gluon plasma. Journal of High Energy Physics, 2021(5), Article 225. https://doi.org/10.1007/JHEP05(2021)225

JYU authors or editors

Publication details

All authors or editors: Boguslavski, K.; Kurkela, A.; Lappi, T.; Peuron, J.

Journal or series: Journal of High Energy Physics

ISSN: 1126-6708

eISSN: 1029-8479

Publication year: 2021

Volume: 2021

Issue number: 5

Article number: 225

Publisher: Springer Science and Business Media LLC

Publication country: Germany

Publication language: English

DOI: https://doi.org/10.1007/JHEP05(2021)225

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/77051

Publication is parallel published: https://arxiv.org/abs/2101.02715


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.

Keywords: particle physics; quark-gluon plasma

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Ministry reporting: Yes

Reporting Year: 2021

JUFO rating: 2

Last updated on 2022-14-09 at 12:11