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Cosmology with quantum matter and a classical gravitational field: the approach of configuration-space ensembles

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.

preprint2013arXivOpen access
Marcel Reginatto
gr-qc
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Marcel Reginatto

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