Inflationary quantum dynamics and backreaction using a classical-quantum correspondence

Abstract We study inflationary dynamics using a recently introduced classical-quantum correspondence for investigating the backreaction of a quantum mechanical degree of freedom to a classical background. Using specifically a coupled Einstein–Klein–Gordon system, an approximation that holds well dur...

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Autor principal:	Reginald Christian Bernardo
Formato:	article
Lenguaje:	EN
Publicado:	SpringerOpen 2021
Materias:	Astrophysics QB460-466 Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
Acceso en línea:	https://doaj.org/article/9435e815e8b04a2ea034298af34e3eba
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spelling	oai:doaj.org-article:9435e815e8b04a2ea034298af34e3eba2021-11-14T12:13:45ZInflationary quantum dynamics and backreaction using a classical-quantum correspondence10.1140/epjc/s10052-021-09781-71434-60441434-6052https://doaj.org/article/9435e815e8b04a2ea034298af34e3eba2021-11-01T00:00:00Zhttps://doi.org/10.1140/epjc/s10052-021-09781-7https://doaj.org/toc/1434-6044https://doaj.org/toc/1434-6052Abstract We study inflationary dynamics using a recently introduced classical-quantum correspondence for investigating the backreaction of a quantum mechanical degree of freedom to a classical background. Using specifically a coupled Einstein–Klein–Gordon system, an approximation that holds well during the very early inflationary era when modes are very deep inside the Hubble horizon, we show that the backreaction of a mode of the quantum field will renormalize the Hubble parameter only if the mode’s wavelength is longer than some threshold Planckian length scale. Otherwise, the mode will destabilize the inflationary era. We also present an approximate analytical solution that supports the existence of such short-wavelength threshold and compare the results of the classical-quantum correspondence with the traditional perturbative-iterative method in semiclassical gravity.Reginald Christian BernardoSpringerOpenarticleAstrophysicsQB460-466Nuclear and particle physics. Atomic energy. RadioactivityQC770-798ENEuropean Physical Journal C: Particles and Fields, Vol 81, Iss 11, Pp 1-17 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Astrophysics QB460-466 Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
spellingShingle	Astrophysics QB460-466 Nuclear and particle physics. Atomic energy. Radioactivity QC770-798 Reginald Christian Bernardo Inflationary quantum dynamics and backreaction using a classical-quantum correspondence
description	Abstract We study inflationary dynamics using a recently introduced classical-quantum correspondence for investigating the backreaction of a quantum mechanical degree of freedom to a classical background. Using specifically a coupled Einstein–Klein–Gordon system, an approximation that holds well during the very early inflationary era when modes are very deep inside the Hubble horizon, we show that the backreaction of a mode of the quantum field will renormalize the Hubble parameter only if the mode’s wavelength is longer than some threshold Planckian length scale. Otherwise, the mode will destabilize the inflationary era. We also present an approximate analytical solution that supports the existence of such short-wavelength threshold and compare the results of the classical-quantum correspondence with the traditional perturbative-iterative method in semiclassical gravity.
format	article
author	Reginald Christian Bernardo
author_facet	Reginald Christian Bernardo
author_sort	Reginald Christian Bernardo
title	Inflationary quantum dynamics and backreaction using a classical-quantum correspondence
title_short	Inflationary quantum dynamics and backreaction using a classical-quantum correspondence
title_full	Inflationary quantum dynamics and backreaction using a classical-quantum correspondence
title_fullStr	Inflationary quantum dynamics and backreaction using a classical-quantum correspondence
title_full_unstemmed	Inflationary quantum dynamics and backreaction using a classical-quantum correspondence
title_sort	inflationary quantum dynamics and backreaction using a classical-quantum correspondence
publisher	SpringerOpen
publishDate	2021
url	https://doaj.org/article/9435e815e8b04a2ea034298af34e3eba
work_keys_str_mv	AT reginaldchristianbernardo inflationaryquantumdynamicsandbackreactionusingaclassicalquantumcorrespondence
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Inflationary quantum dynamics and backreaction using a classical-quantum correspondence

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