The cosmological constant as a zero action boundary

The cosmological constant Λ is usually interpreted as Dark Energy (DE) or modified gravity (MG). Here, we propose instead that Λ corresponds to a boundary term in the action of classical General Relativity. The action is zero for a perfect fluid solution and this fixes Λ to the average density ρ and...

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Detalles Bibliográficos
Autor: Gaztañaga, Enrique
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:10261/262148
Acceso en línea:http://hdl.handle.net/10261/262148
Access Level:acceso abierto
Palabra clave:Cosmic background radiation
Cosmological parameters
Cosmology: dark energy
Early Universe
Inflation
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spelling The cosmological constant as a zero action boundaryGaztañaga, EnriqueCosmic background radiationCosmological parametersCosmology: dark energyEarly UniverseInflationThe cosmological constant Λ is usually interpreted as Dark Energy (DE) or modified gravity (MG). Here, we propose instead that Λ corresponds to a boundary term in the action of classical General Relativity. The action is zero for a perfect fluid solution and this fixes Λ to the average density ρ and pressure p inside a primordial causal boundary: Λ = 4πG <ρ+3p >. This explains both why the observed value of Λ is related to the matter density today and also why other contributions to Λ, such as DE or MG, do not produce cosmic expansion. Cosmic acceleration results from the repulsive boundary force that occurs when the expansion reaches the causal horizon. This universe is similar to the ΛCDM universe, except on the largest observable scales, where we expect departures from homogeneity/isotropy, such as CMB anomalies and variations in cosmological parameters indicated by recent observations.This work has been supported by spanish MINECO grants PGC2018-102021-B-100 and EU grants LACEGAL 734374 and EWC 776247 with ERDF funds. IEEC is funded by the CERCA program of the Generalitat de Catalunya.Royal Astronomical SocietyMinisterio de Ciencia, Innovación y Universidades (España)Generalitat de CatalunyaEuropean CommissionConsejo 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/10261/262148reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MICIU//PGC2018-102021-B-100info:eu-repo/grantAgreement/EC/FP7/776247info:eu-repo/grantAgreement/EC/FP7/734374http://doi.org/10.1093/mnras/stab056Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2621482026-05-22T06:33:51Z
dc.title.none.fl_str_mv The cosmological constant as a zero action boundary
title The cosmological constant as a zero action boundary
spellingShingle The cosmological constant as a zero action boundary
Gaztañaga, Enrique
Cosmic background radiation
Cosmological parameters
Cosmology: dark energy
Early Universe
Inflation
title_short The cosmological constant as a zero action boundary
title_full The cosmological constant as a zero action boundary
title_fullStr The cosmological constant as a zero action boundary
title_full_unstemmed The cosmological constant as a zero action boundary
title_sort The cosmological constant as a zero action boundary
dc.creator.none.fl_str_mv Gaztañaga, Enrique
author Gaztañaga, Enrique
author_facet Gaztañaga, Enrique
author_role author
dc.contributor.none.fl_str_mv Ministerio de Ciencia, Innovación y Universidades (España)
Generalitat de Catalunya
European Commission
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Cosmic background radiation
Cosmological parameters
Cosmology: dark energy
Early Universe
Inflation
topic Cosmic background radiation
Cosmological parameters
Cosmology: dark energy
Early Universe
Inflation
description The cosmological constant Λ is usually interpreted as Dark Energy (DE) or modified gravity (MG). Here, we propose instead that Λ corresponds to a boundary term in the action of classical General Relativity. The action is zero for a perfect fluid solution and this fixes Λ to the average density ρ and pressure p inside a primordial causal boundary: Λ = 4πG <ρ+3p >. This explains both why the observed value of Λ is related to the matter density today and also why other contributions to Λ, such as DE or MG, do not produce cosmic expansion. Cosmic acceleration results from the repulsive boundary force that occurs when the expansion reaches the causal horizon. This universe is similar to the ΛCDM universe, except on the largest observable scales, where we expect departures from homogeneity/isotropy, such as CMB anomalies and variations in cosmological parameters indicated by recent observations.
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/10261/262148
url http://hdl.handle.net/10261/262148
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
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#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MICIU//PGC2018-102021-B-100
info:eu-repo/grantAgreement/EC/FP7/776247
info:eu-repo/grantAgreement/EC/FP7/734374
http://doi.org/10.1093/mnras/stab056
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Royal Astronomical Society
publisher.none.fl_str_mv Royal Astronomical 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
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