A1 Journal article (refereed)
Spectral function of fermions in a highly occupied non-Abelian plasma (2022)

Boguslavski, K., Lappi, T., Mace, M., & Schlichting, S. (2022). Spectral function of fermions in a highly occupied non-Abelian plasma. Physics Letters B, 827, Article 136963. https://doi.org/10.1016/j.physletb.2022.136963

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Publication details

All authors or editors: Boguslavski, K.; Lappi, T.; Mace, M.; Schlichting, S.

Journal or series: Physics Letters B

ISSN: 0370-2693

eISSN: 1873-2445

Publication year: 2022

Publication date: 24/02/2022

Volume: 827

Article number: 136963

Publisher: Elsevier BV

Publication country: Netherlands

Publication language: English

DOI: https://doi.org/10.1016/j.physletb.2022.136963

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/80755

Web address of parallel published publication (pre-print): https://arxiv.org/abs/2106.11319

Abstract

We develop a method to obtain fermion spectral functions non-perturbatively in a non-Abelian gauge theory with high occupation numbers of gauge fields. After recovering the free field case, we extract the spectral function of fermions in a highly occupied non-Abelian plasma close to its non-thermal fixed point, i.e., in a self-similar regime of the non-equilibrium dynamics. We find good agreement with hard loop perturbation theory for medium-induced masses, dispersion relations and quasiparticle residues. We also extract the full momentum dependence of the damping rate of the collective excitations.

Keywords: particle physics; quark-gluon plasma; quantum field theory

Free keywords: quark-gluon plasma; heavy-ion collisions; nonequilibrium QFT; thermal QFT; spectral function; hard-thermal loop

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Ministry reporting: Yes

Reporting Year: 2022

JUFO rating: 2