Spectral function of fermions in a highly occupied non-Abelian plasma
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
Published inPhysics Letters B
© 2022 The Author(s). Published by 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.
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Related funder(s)Research Council of Finland; European Commission
Funding program(s)Academy Project, AoF
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
Additional information about fundingThis work has been supported by the European Research Council under grant no. ERC-2015-CoG-681707, by the EU Horizon 2020 research and innovation programme, STRONG-2020 project (grant agreement No 824093) by the Academy of Finland, project 321840, by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) through the CRC-TR 211 “Strong-interaction matter under extreme conditions” Project number 315477589, and by the Austrian Science Fund (FWF) under project P34455-N. We gratefully acknowledge the National Energy Research Scientific Computing Center, a U.S. Department of Energy Office of Science User Facility supported under Contract No. DE-AC02-05CH11231, the Vienna Scientific Cluster (VSC), Austria, (project 71444), and CSC - IT Center for Science, Finland, for providing computational resources. The content of this article does not reflect the official opinion of the European Union and responsibility for the information and views expressed therein lies entirely with the authors. ...
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