A1 Journal article (refereed)
Highly occupied gauge theories in 2 + 1 dimensions : a self-similar attractor (2019)

Boguslavski, K., Kurkela, A., Lappi, T., & Peuron, J. (2019). Highly occupied gauge theories in 2 + 1 dimensions : a self-similar attractor. Physical Review D, 100(9), Article 094022. https://doi.org/10.1103/PhysRevD.100.094022

JYU authors or editors

Publication details

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

Journal or series: Physical Review D

ISSN: 2470-0010

eISSN: 2470-0029

Publication year: 2019

Volume: 100

Issue number: 9

Article number: 094022

Publisher: American Physical Society

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevD.100.094022

Publication open access: Openly available

Publication channel open access: Partially open access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/66519

Publication is parallel published: https://arxiv.org/abs/1907.05892

Abstract

Motivated by the boost-invariant Glasma state in the initial stages in heavy-ion collisions, we perform classical-statistical simulations of SU(2) gauge theory in 2+1 dimensional space-time both with and without a scalar field in the adjoint representation. We show that irrespective of the details of the initial condition, the far-from-equilibrium evolution of these highly occupied systems approaches a unique universal attractor at high momenta that is the same for the gauge and scalar sectors. We extract the scaling exponents and the form of the distribution function close to this nonthermal fixed point. We find that the dynamics are governed by an energy cascade to higher momenta with scaling exponents α=3β and β=−1/5. We argue that these values can be obtained from parametric estimates within kinetic theory indicating the dominance of small momentum transfer in the scattering processes. We also extract the Debye mass nonperturbatively from a longitudinally polarized correlator and observe an IR enhancement of the scalar correlation function for low momenta below the Debye mass.

Keywords: particle physics

Free keywords: finite temperature field theory; quantum chromodynamics; quark-gluon plasma; relativistic heavy-ion collisions

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Ministry reporting: Yes

Reporting Year: 2019

JUFO rating: 2