Mode couplingon a geometrodynamical quantization of an inflationary universe

A geometrodynamical quantization of an inflationary universe is considered in orderto estimate quantum-gravity effects for the primordial perturbations.Contrary to previous studies in the literature,the back-reaction produced by all the modes of the system is includedin our computations.Even if at a...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2021-07, Vol.2021 (7), p.054
Main Authors: Brizuela, David, de León, Irene
Format: Article
Language:English
Subjects:
Coupled modes
Field theory
Gravity effects
Measurement
Perturbation
Quantum field theory
Quantum theory
Universe
Online Access:Get full text
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Summary:A geometrodynamical quantization of an inflationary universe is considered in orderto estimate quantum-gravity effects for the primordial perturbations.Contrary to previous studies in the literature,the back-reaction produced by all the modes of the system is includedin our computations.Even if at a classical level the assumptionthat every mode evolves independently provides a good estimate for thedynamics, our results explicitly show that this is not the case when consideringquantum-gravity effects. More precisely, both the self-interaction,as well as the back-reaction from other modes, provide a correction ofthe same order of magnitude to the usual power spectrum as computedin the approximation of quantum fieldtheory on classical backgrounds. In particular, these quantum-gravityeffects introduce certain characteristic scale-dependence on theexpression of the power spectrum.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2021/07/054