Fermion and gluon spectral functions far from equilibrium

Abstract

Motivated by the quark-gluon plasma, we develop a simulation method to obtain the spectral function of (Wilson) fermions non-perturbatively in a non-Abelian gauge theory with large gluon occupation numbers [arXiv:2106.11319]. We apply our method to a non-Abelian plasma close to its non-thermal fixed point, i.e., in a far-from-equilibrium self-similar regime, and find mostly very good agreement with perturbative hard loop (HTL) calculations. For the first time, we extract the full momentum dependence of the damping rate of fermionic collective excitations and compare our results to recent non-perturbative extractions of gluonic spectral functions in two and three spatial dimensions [arXiv:2101.02715, arXiv:1804.01966].

arXiv comment8 pages, 5 figures; Talk given at the Virtual Tribute to Quark Confinement and the Hadron Spectrum (vConf21), Stavanger, Norway, August 2nd - 6th, 2021

References in corpus (18)

• Reheating in Inflationary Cosmology: Theory and Applications
• The Quark-Gluon Plasma: Collective Dynamics and Hard Thermal Loops
• Introduction to Nonequilibrium Quantum Field Theory
• Universal attractor in a highly occupied non-Abelian plasma
• The First fm/c of Heavy-Ion Collisions
• UV Cascade in Classical Yang-Mills Theory
• Basin of attraction for turbulent thermalization and the range of validity of classical-statistical simulations
• Real-Time Dynamics with Fermions on a Lattice
• Non-equilibrium study of the Chiral Magnetic Effect from real-time simulations with dynamical fermions
• Spectral function for overoccupied gluodynamics from real-time lattice simulations
• Heavy quark diffusion in an overoccupied gluon plasma
• Chiral instabilities & the onset of chiral turbulence in QED plasmas
• Breaking the Fluctuation-Dissipation Relation by Universal Transport Processes
• Making the Relativistic Dynamics Equation Covariant: Explicit Solutions for Motion under a Constant Force
• Time evolution of linearized gauge field fluctuations on a real-time lattice
• Highly occupied gauge theories in 2+1 dimensions: self-similar attractor
• Unraveling the nature of universal dynamics in $O(N)$ theories
• Broad excitations in a 2+1D overoccupied gluon plasma