Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
1999-06-24
Lect.Notes Phys. 541 (2000) 158-187
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
31 pages, LATEX, needs Springer macro cl2emult.cls, 3 eps-figures, contribution for the Karpacz winter school 1999
Scientific paper
I give a review of the conceptual issues that arise in theories of quantum cosmology. I start by emphasising some features of ordinary quantum theory that also play a crucial role in understanding quantum cosmology. I then give motivations why spacetime cannot be treated classically at the most fundamental level. Two important issues in quantum cosmology -- the problem of time and the role of boundary conditions -- are discussed at some length. Finally, I discuss how classical spacetime can be recovered as an approximate notion. This involves the application of a semiclassical approximation and the process of decoherence. The latter is applied to both global degrees of freedom and primordial fluctuations in an inflationary Universe.
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