Phenomenological dynamics of loop quantum cosmology in Kantowski-Sachs spacetime

Journal Article · Fri Aug 15 04:00:00 EDT 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.78.044019· OSTI ID:21250503

Chiou, D -W ^[1]

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1. Institute for Gravitation and the Cosmos, Physics Department, Pennsylvania State University, University Park, Pennsylvania 16802 (United States)

The fundamental theory and the semiclassical description of loop quantum cosmology (LQC) have been studied in the Friedmann-Robertson-Walker and Bianchi I models. As an extension to include both anisotropy and intrinsic curvature, this paper investigates the cosmological model of Kantowski-Sachs spacetime with a free massless scalar field at the level of phenomenological dynamics with the LQC discreteness corrections. The LQC corrections are implemented in two different improved quantization schemes. In both schemes, the big bang and big crunch singularities of the classical solution are resolved and replaced by the big bounces when the area or volume scale factor approaches the critical values in the Planck regime measured by the reference of the scalar field momentum. Symmetries of scaling are also noted and suggest that the fundamental spatial scale (area gap) may give rise to a temporal scale. The bouncing scenarios are in an analogous fashion of the Bianchi I model, naturally extending the observations obtained previously.

• OSTI ID: 21250503
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 4 Vol. 78; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANISOTROPY
CORRECTIONS
COSMOLOGICAL MODELS
COSMOLOGY
MATHEMATICAL SOLUTIONS
QUANTIZATION
QUANTUM GRAVITY
SCALAR FIELDS
SCALING
SEMICLASSICAL APPROXIMATION
SIMULATION
SINGULARITY
SPACE-TIME
SYMMETRY