Cosmology with quantum matter and a classical gravitational field: the approach of configuration-space ensembles
arXiv:1312.0435 · doi:10.1088/1742-6596/442/1/012009
Abstract
I consider the formulation of hybrid cosmological models that consists of a classical gravitational field interacting with a quantized massive scalar field in the formalism of ensembles on configuration space. This is a viable approach that provides an alternative to semiclassical gravity. I discuss a particular, highly nonclassical solution in two approximations, minisuperspace and spherically-symmetric midisuperspace. In both cases, the coupling of the quantum scalar field and classical gravitational field leads to a cosmological model which has a quantized radius of the universe.
21 pages. Presented at the Sixth International Workshop on Decoherence, Information, Complexity and Entropy DICE 2012, 17-21 September 2012, Castiglioncello, Italy. This article supersedes arXiv:0908.0752
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