Instability-induced fermion production in quantum field theory
arXiv:0904.3073 · doi:10.1103/PhysRevD.80.023522
Abstract
Nonequilibrium instabilities are known to lead to exponential amplification of boson occupation numbers for low momentum modes on time scales much shorter than the asymptotic thermal equilibration time. We show for Yukawa-type interactions that this growth induces very efficient fermion production, which proceeds with the maximum primary boson growth rate. The description is based on a 1/N expansion of the 2PI effective action to NLO including boson-fermion loops, which are crucial to observe this phenomenon. For long enough amplification in the boson sector, fermion production terminates when the thermal occupancy is reached in the infrared. At higher momenta, where boson occupation numbers are low, the fermion modes exhibit a power-law regime with exponent two.
19 pages, 16 figures, Phys.Rev.D version, minor corrections
References in corpus (7)
- Non-thermal fixed points: effective weak-coupling for strongly correlated systems far from equilibrium
- Nonthermal fixed points and the functional renormalization group
- Bottom-up isotropization in classical-statistical lattice gauge theory
- Quantum versus classical statistical dynamics of an ultracold Bose gas
- Chemical thermalization in relativistic heavy ion collisions
- Expanding color flux tubes and instabilities
- Comparison of Boltzmann Kinetics with Quantum Dynamics for a Chiral Yukawa Model Far From Equilibrium