Hybrid quantization of an inflationary model: The flat case
| Autor: | Javier Olmedo, Mikel Fernández-Méndez, Guillermo A. Mena Marugán |
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| Rok vydání: | 2013 |
| Předmět: |
Physics
Nuclear and High Energy Physics Canonical quantization FOS: Physical sciences General Relativity and Quantum Cosmology (gr-qc) minisuperspace models General Relativity and Quantum Cosmology Fock space Quantization (physics) Classical mechanics Hamiltonian constraint Quantum cosmology [PACS] Quantum cosmology Quantum field theory [PACS] Lower dimensional models [PACS] Loop quantum gravity quantum geometry spin foams Scalar field Quantum |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 1550-2368 1550-7998 |
| DOI: | 10.1103/physrevd.88.044013 |
| Popis: | We present a complete quantization of an approximately homogeneous and isotropic universe with small scalar perturbations. We consider the case in which the matter content is a minimally coupled scalar field and the spatial sections are flat and compact, with the topology of a three-torus. The quantization is carried out along the lines that were put forward by the authors in a previous work for spherical topology. The action of the system is truncated at second order in perturbations. The local gauge freedom is fixed at the classical level, although different gauges are discussed and shown to lead to equivalent conclusions. Moreover, descriptions in terms of gauge-invariant quantities are considered. The reduced system is proven to admit a symplectic structure, and its dynamical evolution is dictated by a Hamiltonian constraint. Then, the background geometry is polymerically quantized, while a Fock representation is adopted for the inhomogeneities. The latter is selected by uniqueness criteria adapted from quantum field theory in curved spacetimes, which determine a specific scaling of the perturbations. In our hybrid quantization, we promote the Hamiltonian constraint to an operator on the kinematical Hilbert space. If the zero mode of the scalar field is interpreted as a relational time, a suitable ansatz for the dependence of the physical states on the polymeric degrees of freedom leads to a quantum wave equation for the evolution of the perturbations. Alternatively, the solutions to the quantum constraint can be characterized by their initial data on the minimum-volume section of each superselection sector. The physical implications of this model will be addressed in a future work, in order to check whether they are compatible with observations. © 2013 American Physical Society. This work was supported by Project No. MICINN/MINECO FIS2011- 30145-C03-02 from Spain. M. F.-M. acknowledges CSIC and the European Social Fund for support under Grant No. JAEPre_2010_01544. |
| Databáze: | OpenAIRE |
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