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Title:
Large scale effective theory for cosmological bounces
Authors:
Bojowald, Martin
Affiliation:
AA(Institute for Gravitational Physics and Geometry, The Pennsylvania State University, 104 Davey Lab, University Park, Pennsylvania 16802, USA)
Publication:
Physical Review D, vol. 75, Issue 8, id. 081301 (PhRvD Homepage)
Publication Date:
04/2007
Origin:
APS
PACS Keywords:
Quantum cosmology, Loop quantum gravity, quantum geometry, spin foams, Origin and formation of the Universe
DOI:
10.1103/PhysRevD.75.081301
Bibliographic Code:
2007PhRvD..75h1301B

Abstract

An exactly solvable bounce model in loop quantum cosmology is identified which serves as a perturbative basis for realistic bounce scenarios. Its bouncing solutions are derived analytically, demonstrating why recent numerical simulations robustly led to smooth bounces under the assumption of semiclassicality. Several effects, easily included in a perturbative analysis, can however change this smoothness. The effective theory is not only applicable to such situations where numerical techniques become highly involved but also allows one to discuss conceptual issues. For instance, consequences of the notoriously difficult physical inner product can be implemented at the effective level. This indicates that even physical predictions from full quantum gravity can be obtained from perturbative effective equations.
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