
TL;DR
This review explores quantum cosmology by emphasizing the role of inhomogeneity and many interacting degrees of freedom, connecting it with condensed matter and particle physics, and discussing new methodological developments.
Contribution
It introduces a novel perspective on quantum cosmology that moves beyond minisuperspace models, incorporating inhomogeneity and microscopic interactions in the space-time description.
Findings
New formulation of quantum cosmology emphasizing inhomogeneity
Connections established with condensed matter and particle physics systems
Discussion of methodological extensions for fundamental and effective theories
Abstract
In quantum cosmology, one applies quantum physics to the whole universe. While no unique version and no completely well-defined 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: De-emphasizing the traditional minisuperspace view, the dynamics is rather formulated in terms of the interplay of many interacting "microscopic" degrees of freedom that describe the space-time geometry. There is thus a close relationship with more-established systems in condensed-matter and particle physics even while the large set of space-time 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…
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