Spectral function of fermions in a highly occupied non-Abelian plasma

Journal Article · 23 February 2022 · Physics Letters. B

DOI: https://doi.org/10.1016/j.physletb.2022.136963 · OSTI ID:1981731

Boguslavski, K.  ^[1]; Lappi, T.  ^[2]; Mace, M. ^[2]; Schlichting, S. ^[3]

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1. Technische University Wien (Austria)
2. University of Jyvaskyla (Finland); University of Helsinki (Finland)
3. Universität Bielefeld (Germany)

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.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Technische University Wien (Austria)
• Sponsoring Organization: Academy of Finland; Austrian Science Fund (FWF); EU Horizon 2020; European Research Council (ERC); German Research Foundation (DFG); USDOE Office of Science (SC)
• Grant/Contract Number: AC02-05CH11231
• OSTI ID: 1981731
• Journal Information: Physics Letters. B, Journal Name: Physics Letters. B Journal Issue: C Vol. 827; ISSN 0370-2693
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English