Thermalisation of inhomogeneous quantum scalar fields in 1+1D
  Using an improved version of the Hartree approximation, allowing for ensembles of inhomogeneous configurations, we show in a $\lambda \phi^4$ theory, that initially the system thermalises with a Bose-Einstein distribution. For later times and larger couplings we see deviations. 
M. Salle, J. Smit and J.C. Vink