Broad excitations in a 2+1D overoccupied gluon plasma
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
Published inJournal of High Energy Physics
© The Authors. Article funded by SCOAP3.
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.
PublisherSpringer Science and Business Media LLC
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Related funder(s)Academy of Finland; European Commission
Funding program(s)Academy Project, AoF
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
Additional information about fundingThis work has been supported by the European Research Council under grant no. ERC-2015-CoG-681707, by the EU Horizon 2020 research and innovation programme, STRONG-2020 project (grant agreement No 824093) and by the Academy of Finland, project 321840. This work was funded in part by the Knut and Alice Wallenberg foundation, contract number 2017.0036.
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