Damping and the Hartree Ensemble Approximation
  We study a Hartree ensemble approximation for real-time dynamics in the toy model of 1+1 dimensional scalar field theory. Damping behavior seen in numerical simulations is compared with analytical predictions based on perturbation theory in the original (non-Hartree-approximated) model. 
M. Salle, J. Smit and J.C. Vink