R2 inflation revisited and dark energy corrections

The vacuum R2 model is known to generate a quasi-de Sitter evolution for inflation, using solely the slow-roll assumptions. Using standard reconstruction techniques, we demonstrate that the f(R) gravity which actually realizes the quasi-de Sitter evolution is not simply the R2 model but a deformed R...

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Detalles Bibliográficos
Autores: Odintsov, Sergei D., Oikonomou, Vasilis K.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2021
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/261352
Acceso en línea:http://hdl.handle.net/10261/261352
Access Level:acceso abierto
Palabra clave:Alternative gravity theories
Cosmological parameters
Dark energy
Inflation
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spelling R2 inflation revisited and dark energy correctionsOdintsov, Sergei D.Oikonomou, Vasilis K.Alternative gravity theoriesCosmological parametersDark energyInflationThe vacuum R2 model is known to generate a quasi-de Sitter evolution for inflation, using solely the slow-roll assumptions. Using standard reconstruction techniques, we demonstrate that the f(R) gravity which actually realizes the quasi-de Sitter evolution is not simply the R2 model but a deformed R2 model which contains extra terms in addition to the R2 model. We analyze in detail the inflationary dynamics of the deformed R2 model and we demonstrate that the predictions are quite close to the ones of the pure R2 model, regardless the values of the free parameters. Basically the deformed R2 model is also a single parameter inflationary model, exactly like the ordinary R2 model. In contrast to the early-time era, where the deformed R2 model is quite similar to the R2 model, at late times, the phenomenological picture is different. The deformed R2 model describes stronger gravity compared to the ordinary R2 with an effectively smaller effective Planck mass. We propose the addition of an early dark energy term which does not affect at all the inflationary era, but takes over the control of the late-time dynamics at late times. We study in some detail the predicted dark energy era evolution, and we demonstrate that the dark energy corrected deformed R2 model can describe a viable dark energy era, compatible with the Planck constraints on cosmological parameters. Furthermore the model is distinct from the Λ cold dark matter model, but shows a qualitatively similar behavior.This work was supported by MINECO (Spain), Project No. PID2019-104397-GB-I00 (S. D. O).American Physical SocietyMinisterio de Ciencia, Innovación y Universidades (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2022202220212022info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/261352reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-104397GB-I00http://doi.org/10.1103/PhysRevD.104.124065Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2613522026-05-22T06:33:51Z
dc.title.none.fl_str_mv R2 inflation revisited and dark energy corrections
title R2 inflation revisited and dark energy corrections
spellingShingle R2 inflation revisited and dark energy corrections
Odintsov, Sergei D.
Alternative gravity theories
Cosmological parameters
Dark energy
Inflation
title_short R2 inflation revisited and dark energy corrections
title_full R2 inflation revisited and dark energy corrections
title_fullStr R2 inflation revisited and dark energy corrections
title_full_unstemmed R2 inflation revisited and dark energy corrections
title_sort R2 inflation revisited and dark energy corrections
dc.creator.none.fl_str_mv Odintsov, Sergei D.
Oikonomou, Vasilis K.
author Odintsov, Sergei D.
author_facet Odintsov, Sergei D.
Oikonomou, Vasilis K.
author_role author
author2 Oikonomou, Vasilis K.
author2_role author
dc.contributor.none.fl_str_mv Ministerio de Ciencia, Innovación y Universidades (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Alternative gravity theories
Cosmological parameters
Dark energy
Inflation
topic Alternative gravity theories
Cosmological parameters
Dark energy
Inflation
description The vacuum R2 model is known to generate a quasi-de Sitter evolution for inflation, using solely the slow-roll assumptions. Using standard reconstruction techniques, we demonstrate that the f(R) gravity which actually realizes the quasi-de Sitter evolution is not simply the R2 model but a deformed R2 model which contains extra terms in addition to the R2 model. We analyze in detail the inflationary dynamics of the deformed R2 model and we demonstrate that the predictions are quite close to the ones of the pure R2 model, regardless the values of the free parameters. Basically the deformed R2 model is also a single parameter inflationary model, exactly like the ordinary R2 model. In contrast to the early-time era, where the deformed R2 model is quite similar to the R2 model, at late times, the phenomenological picture is different. The deformed R2 model describes stronger gravity compared to the ordinary R2 with an effectively smaller effective Planck mass. We propose the addition of an early dark energy term which does not affect at all the inflationary era, but takes over the control of the late-time dynamics at late times. We study in some detail the predicted dark energy era evolution, and we demonstrate that the dark energy corrected deformed R2 model can describe a viable dark energy era, compatible with the Planck constraints on cosmological parameters. Furthermore the model is distinct from the Λ cold dark matter model, but shows a qualitatively similar behavior.
publishDate 2021
dc.date.none.fl_str_mv 2021
2022
2022
2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/261352
url http://hdl.handle.net/10261/261352
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-104397GB-I00
http://doi.org/10.1103/PhysRevD.104.124065
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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