Non-Oscillatory Power Spectrum From States of Low Energy in Kinetically Dominated Early Universes

Recently, States of Low Energy (SLEs) have been proposed as viable vacuum states of primordial perturbations within Loop Quantum Cosmology (LQC). In this work we investigate the effect of the high curvature region of LQC on the definition of SLEs. Shifting the support of the test function that defin...

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Bibliographic Details
Published in:Frontiers in astronomy and space sciences 2021-08, Vol.8
Main Authors: Martín-Benito , Mercedes, Neves , Rita B., Olmedo , Javier
Format: Article
Language:English
Subjects:
inflation
loop quantum cosmology
power spectra
primordial perturbations
quantum field theory in curved spacetimes
states of low energy
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Summary:Recently, States of Low Energy (SLEs) have been proposed as viable vacuum states of primordial perturbations within Loop Quantum Cosmology (LQC). In this work we investigate the effect of the high curvature region of LQC on the definition of SLEs. Shifting the support of the test function that defines them away from this regime results in primordial power spectra of perturbations closer to those of the so-called Non-oscillatory (NO) vacuum, which is another viable choice of initial conditions previously introduced in the LQC context. Furthermore, through a comparison with the Hadamard-like SLEs, we prove that the NO vacuum is of Hadamard type as well.
ISSN:2296-987X
2296-987X
DOI:10.3389/fspas.2021.702543