Non-Gaussian Correlations Outside the Horizon in Local Thermal   Equilibrium
  Making a connection between observations of cosmological correlation functions and those calculated from theories of the early universe requires that these quantities are conserved through the periods of the universe which we do not understand. In this paper, the results of [0810.2831] are extended to show that tree-approximation correlation functions of Heisenberg picture operators for the reduced spatial metric are constant outside the horizon during local thermal equilibrium with no non-zero conserved quantum numbers. 
Joel Meyers
astro-ph.CO gr-qc hep-th