We investigate the evolution of a massless, conformally coupled scalar field interacting with an environment in a spatially flat FRW metric. The environment is taken to be a second massless, conformally coupled scalar field. By finding the ground state wavefunctional of the coupled system and integrating out the unobservable scalar field we obtain a reduced density matrix for the system. We then use the reduced density matrix to show that classical behaviour emerges for wavelengths greater than the Hubble radius. This occurs despite the absence of particle creation.
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