Decoherence in an accelerated universe
  In this paper we study the decoherence processes of the semiclassical branches of an accelerated universe due to their interaction with a scalar field with given mass. We use a third quantization formalism to analyze the decoherence between two branches of a parent universe caused by their interaction with the vaccum fluctuations of the space-time, and with other parent unverses in a multiverse scenario. 
S. Robles-Perez, A. Alonso-Serrano, P. F. Gonzalez-Diaz
gr-qc