Amplified Fermion Production from Overpopulated Bose Fields

Abstract

We study the real-time dynamics of fermions coupled to scalar fields in a linear sigma model, which is often employed in the context of preheating after inflation or as a low-energy effective model for quantum chromodynamics. We find a dramatic amplification of fermion production in the presence of highly occupied bosonic quanta for weak as well as strong couplings. For this we consider the range of validity of different methods: lattice simulations with male/female fermions, the mode functions approach and the quantum 2PI effective action with its associated kinetic theory. For strongly coupled fermions we find a rapid approach to a Fermi-Dirac distribution with time-dependent temperature and chemical potential parameters, while the bosons are still far from equilibrium.

16 pages, 14 figures

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• Fermion production from real-time lattice gauge theory in the classical-statistical regime
• Matrix-product-state method with a dynamical local basis optimization for bosonic systems out of equilibrium
• Numerical study of chiral plasma instability within the classical statistical field theory approach
• Nonequilibrium fixed points in longitudinally expanding scalar theories: infrared cascade, Bose condensation and a challenge for kinetic theory
• Nonthermal Fixed Points in Quantum Field Theory Beyond the Weak-Coupling Limit
• Early quark production and approach to chemical equilibrium
• Nonequilibrium quark production in the expanding QCD plasma
• Electromagnetic currents induced by color fields
• Thermalization and dynamical spectral properties in the quark-meson model
• Nonequilibrium quark production in the expanding QCD plasma
• Simulations of "Tunnelling of the 3rd Kind"