Nonsingular cosmology from evolutionary quantum gravity
arXiv:1408.1238 · doi:10.1103/PhysRevD.90.103503
Abstract
We provide a cosmological implementation of the evolutionary quantum gravity, describing an isotropic Universe, in the presence of a negative cosmological constant and a massive (preinflationary) scalar field. We demonstrate that the considered Universe has a nonsingular quantum behavior, associated to a primordial bounce, whose ground state has a high occupation number. Furthermore, in such a vacuum state, the super-Hamiltonian eigenvalue is negative, corresponding to a positive emerging dust energy density. The regularization of the model is performed via a polymer quantum approach to the Universe scale factor and the proper classical limit is then recovered, in agreement with a preinflationary state of the Universe. Since the dust energy density is redshifted by the Universe deSitter phase and the cosmological constant does not enter the ground state eigenvalue, we get a late-time cosmology, compatible with the present observations, endowed with a turning point in the far future.
17 pages, 8 figures, minor changes, accepted for publication in Phys. Rev. D
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Cited by in corpus (6)
- An Overview on the Nature of the Bounce in LQC and PQM
- Semi-classical and quantum analysis of the isotropic Universe in the polymer paradigm
- Behavior of the Universe anisotropy in a big-bounce cosmology
- Big-bounce cosmology from quantum gravity: The case of a cyclical Bianchi I universe
- Bianchi I model as a prototype for a cyclical Universe
- WKB Approximation for the Polymer Quantization of the Taub Model