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

6th International Workshop DICE2012 Spacetime – Matter – Quantum Mechanics: From the Planck Scale to Emergent Phenomena

物理学;力学

Reginatto, Marcel^1

Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany^1

关键词: Configuration space;    Cosmological modeling;    Cosmological models;    Gravitational fields;    Quantum matter;    Scalar fields;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/442/1/012009/pdf
DOI  :  10.1088/1742-6596/442/1/012009

学科分类：力学，机械学

来源: IOP

【 摘 要 】

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.