Quantum Cosmology
arXiv:0804.0672 · doi:10.1515/zna-2021-0384
Abstract
We give an introduction into quantum cosmology with emphasis on its conceptual parts. After a general motivation we review the formalism of canonical quantum gravity on which discussions of quantum cosmology are usually based. We then present the minisuperspace Wheeler--DeWitt equation and elaborate on the problem of time, the imposition of boundary conditions, the semiclassical approximation, the origin of irreversibility, and singularity avoidance. Restriction is made to the framework of quantum geometrodynamics.
30 pages, 9 figures, published version
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- The Hubble tension from the standpoint of quantum cosmology
- Dissipative Emergence of Inflation from Quasi-Cyclic Universe
- Testing the problem of time with cold atoms
- Quantum Mechanics from General Relativity and the Quantum Friedmann Equation
- Quantum Gravity, Hydrodynamics and Emergent Cosmology: A Collection of Perspectives
- Repeated measurements on non-replicable systems and their consequences for Unruh-DeWitt detectors
- The quantization of gravity: The quantization of the full Einstein equations
- Effects of quantum corrections to Lorentzian vacuum transitions in the presence of gravity
- On measuring the Quantum Universe
- Revisiting the Origin of the Universe and the Arrow of Time