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Title:
Singularities and Quantum Gravity
Authors:
Bojowald, Martin
Affiliation:
Institute for Gravitational Physics and Geometry, The Pennsylvania State University, 104 Davey Lab, University Park, PA 16801
Publication:
COSMOLOGY AND GRAVITATION: XIIth Brazilian School of Cosmololy and Gravitation. AIP Conference Proceedings, Volume 910, pp. 294-333 (2007). (AIPC Homepage)
Publication Date:
06/2007
Origin:
AIP
PACS Keywords:
Singularities and cosmic censorship, Loop quantum gravity, quantum geometry, spin foams, Quantum cosmology
DOI:
10.1063/1.2752483
Bibliographic Code:
2007AIPC..910..294B

Abstract

Although there is general agreement that a removal of classical gravitational singularities is not only a crucial conceptual test of any approach to quantum gravity but also a prerequisite for any fundamental theory, the precise criteria for non-singular behavior are often unclear or controversial. Often, only special types of singularities such as the curvature singularities found in isotropic cosmological models are discussed and it is far from clear what this implies for the very general singularities that arise according to the singularity theorems of general relativity. In these lectures we present an overview of the current status of singularities in classical and quantum gravity, starting with a review and interpretation of the classical singularity theorems. This suggests possible routes for quantum gravity to evade the devastating conclusion of the theorems by different means, including modified dynamics or modified geometrical structures underlying quantum gravity. The latter is most clearly present in canonical quantizations which are discussed in more detail. Finally, the results are used to propose a general scheme of singularity removal, quantum hyperbolicity, to show cases where it is realized and to derive intuitive semiclassical pictures of cosmological bounces.
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