Kadanoff-Baym Approach to Thermalization of Quantum Fields

29th Winter Workshop on Nuclear Dynamics

Nishiyama, Akihiro^1 ; Hatta, Yoshitaka^2

Maskawa Institute for Science and Culture, Kyoto Sangyo University, Kyoto 603-8555, Japan^1

Graduate School of Pure and Applied Sciences, University of Tsukuba, Ibaraki 305-8571, Japan^2

关键词: Classical fields;    Longitudinal expansions;    Next-to-leading orders;    Non equilibrium;    Numerical results;    Quantum dynamics;    Statistical approximation;    Time evolutions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/458/1/012030/pdf
DOI  :  10.1088/1742-6596/458/1/012030

来源: IOP

【 摘 要 】

Numerical results of nonequilibrium field theory are shown for O(N) sealer model in 2+1 dimensions with longitudinal expansion. We adopt Next-to-Leading Order of 1/N expansion of self energy with background classical fields to cover all of time evolution of instability. We show differences between quantum dynamics and classical statistical approximation in strongly coupled regimes. As a result we show that we can achieve Boltzmann tail of the final distribution function only in quantum dynamics.