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Title

Anti-de Sitter universe dynamics in loop quantum cosmology

AuthorsBentivegna, Eloisa; Pawlowski, Tomasz CSIC ORCID
Keywords[PACS] Lower dimensional and minisuperspace models in quantum gravity
[PACS] Semiclassical theories and applications in quantum mechanics
[PACS] Loop quantum gravity, quantum geometry, spin foams
[PACS] Quantum cosmology
Issue Date18-Jun-2008
PublisherAmerican Physical Society
CitationPhysical Review D, 77 (12), id. 124025 (2008)
AbstractA model for a flat isotropic universe with a negative cosmological constant Lambda and a massless scalar field as sole matter content is studied within the framework of loop quantum cosmology. By application of the methods introduced for the model with Lambda=0, the physical Hilbert space and the set of Dirac observables are constructed. As in that case, the scalar field plays here the role of an emergent time. The properties of the system are found to be similar to those of the k=1 Friedmann-Robertson-Walker (FRW) model: for small energy densities, the quantum dynamics reproduces the classical one, whereas, due to modifications at near-Planckian densities, the big bang and big crunch singularities are replaced by a quantum bounce connecting deterministically the large semiclassical epochs. Thus in loop quantum cosmology the evolution is qualitatively cyclic.
Description17 pags. ; 11 figs. ; appendix A-B
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevD.77.124025
URIhttp://hdl.handle.net/10261/12849
DOI10.1103/PhysRevD.77.124025
ISSN0556-2821
Appears in Collections:(CFMAC-IEM) Artículos

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