Quantum cosmology: a review
Abstract
In quantum cosmology, one applies quantum physics to the whole universe. While no unique version and no completely welldefined theory is available yet, the framework gives rise to interesting conceptual, mathematical and physical questions. This review presents quantum cosmology in a new picture that tries to incorporate the importance of inhomogeneity. Deemphasizing the traditional minisuperspace view, the dynamics is rather formulated in terms of the interplay of many interacting ‘microscopic’ degrees of freedom that describe the spacetime geometry. There is thus a close relationship with moreestablished systems in condensedmatter and particle physics even while the large set of spacetime symmetries (general covariance) requires some adaptations and new developments. These extensions of standard methods are needed both at the fundamental level and at the stage of evaluating the theory by effective descriptions.
 Publication:

Reports on Progress in Physics
 Pub Date:
 February 2015
 DOI:
 10.1088/00344885/78/2/023901
 arXiv:
 arXiv:1501.04899
 Bibcode:
 2015RPPh...78b3901B
 Keywords:

 General Relativity and Quantum Cosmology;
 Astrophysics  Cosmology and Nongalactic Astrophysics;
 High Energy Physics  Theory
 EPrint:
 45 pages, invited review