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Quantum GravityThird Edition$
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Claus Kiefer

Print publication date: 2012

Print ISBN-13: 9780199585205

Published to Oxford Scholarship Online: May 2012

DOI: 10.1093/acprof:oso/9780199585205.001.0001

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Quantum cosmology

Quantum cosmology

(p.260) 8 Quantum cosmology
Quantum Gravity

Claus Kiefer

Oxford University Press

This chapter considers the second important application of quantum gravity - quantum cosmology. The central concept of minisuperspace is introduced and applied to the quantization of a Friedmann universe. Inhomogeneities are taken into account in a perturbative sense. A central role of this chapter is played by the discussion of boundary conditions, notably the no-boundary proposal by Hartle and Hawking and the tunneling condition by Vilenkin and others; the two proposals are compared in detail. The chapter also contains sections on loop quantum cosmology and singularity avoidance.

Keywords:   Quantum cosmology, minisuperspace, perturbations, boundary conditions, no-boundary proposal, tunneling proposal, loop quantum cosmology, singularity avoidance

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