Non-Oscillatory Power Spectrum From States of Low Energy in Kinetically Dominated Early Universes Martín Benito, Mercedes Neves, Rita Olmedo Nieto, Javier Antonio Loop quantum cosmology Inflation Primordial perturbations Power spectra Quantum field theory in curved spacetimes States of low energy Non-oscillatory vacuum state This work is supported by the Spanish Government through the projects FIS2017-86497-C2-2-P and PID2019-105943GB-I00 (with FEDER contribution). RN acknowledges financial support from Fundação para a Ciência e a Tecnologia (FCT) through the research grant SFRH/BD/143525/2019. JO acknowledges the Operative Program FEDER2014-2020 Junta de Andalucía-Consejería de Economía y Conocimiento under project E-FQM-262-UGR18 by Universidad de Granada. 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. 2021-11-24T13:02:01Z 2021-11-24T13:02:01Z 2021-08-17 info:eu-repo/semantics/article Martín-Benito M, Neves RB and Olmedo J (2021) Non-Oscillatory Power Spectrum From States of Low Energy in Kinetically Dominated Early Universes. Front. Astron. Space Sci. 8:702543. [doi: 10.3389/fspas.2021.702543] http://hdl.handle.net/10481/71726 10.3389/fspas.2021.702543 eng http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Atribución 3.0 España Frontiers Media