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

Kirill Boguslavski
(
- Vienna, Tech. U.
)
,
Tuomas Lappi
(
- Unlisted, FI and
- Helsinki Inst. of Phys.
)
,
Mark Mace
(
- Unlisted, FI and
- Helsinki Inst. of Phys.
)
,
Sören Schlichting
(
- Bielefeld U.
)

Jun 21, 2021

13 pages

Published in:

Phys.Lett.B 827 (2022) 136963

Published: Apr 10, 2022

e-Print:

2106.11319 [hep-ph]

DOI:

10.1016/j.physletb.2022.136963 (publication)

View in:

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Abstract: (Elsevier B.V.)

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.

Note:

13 pages, 6 figures; v2: minor revision, data and plot files attached, published in Phys. Lett. B

Quark-gluon plasma
Heavy-ion collisions
Nonequilibrium QFT
Thermal QFT
Spectral function
Hard-thermal loop
fermion: spectral representation
plasma: nonabelian
excited state: collective
gauge field theory: nonabelian

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