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Jun 24 – 28, 2019
US/Eastern timezone
5th International Conference on the Initial Stages in High-Energy Nuclear Collisions

Self-similarity and spectral functions of non-Abelian plasmas in 2+1D

Jun 25, 2019, 2:40 PM
301 (Pupin )



Oral Approach to equilibrium (weak & strong coupling) Parallel: Approach to Equilibrium


Dr Jarkko Peuron (ECT*)


To better understand the dynamics of initial stages in heavy-ion collisions, we perform classical-statistical simulations of SU(2) gauge theory in 2+1 dimensions. We find that highly occupied non-Abelian plasmas approach the same 2+1D self-similar state at late times of their far-from-equilibrium evolution, irrespective of details of their initial conditions, and we determine the scaling exponents. We extract the spectral function non-perturbatively and show that for larger momenta than the mass scale p >> m, one sees a pronounced peak in the frequency domain, while at low momenta p < m, quasi-particle assumptions become invalid. The hard-thermal loop (HTL) formalism is not applicable to 2+1D gauge theories at low momenta p <= m, and indeed, our results are inconsistent with its predictions. This challenges our detailed understanding of plasma instabilities at initial stages that is mostly based on HTL calculations of highly anisotropic gluonic matter.

Primary authors

Dr Kirill Boguslavski (Vienna University of Technology) Prof. Aleksi Kurkela (CERN) Prof. Tuomas Lappi (University of Jyväskylä) Dr Jarkko Peuron (ECT*)

Presentation materials