GREA and dark energy: A holographic correspondence

The nature of the cosmological constant is a mystery. We don’t understand its quantum origin but we associate it with the actual acceleration of the universe because it is the simplest description we had until recently of the present cosmological observations. However, this may change with the next...

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Detalles Bibliográficos
Autor: García-Bellido Capdevila, Juan
Tipo de recurso: artículo
Fecha de publicación:2026
País:España
Institución:Universidad Autónoma de Madrid
Repositorio:Biblos-e Archivo. Repositorio Institucional de la UAM
Idioma:inglés
OAI Identifier:oai:dnet:biblosearchi::16d05de41c4cccf1377582ac201efadf
Acceso en línea:https://hdl.handle.net/10486/764320
https://dx.doi.org/10.1016/j.dark.2026.102319
Access Level:acceso abierto
Palabra clave:Dark energy
Holography
Accelerated expansion
Horizons
Física
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spelling GREA and dark energy: A holographic correspondenceGarcía-Bellido Capdevila, JuanDark energyHolographyAccelerated expansionHorizonsFísicaThe nature of the cosmological constant is a mystery. We don’t understand its quantum origin but we associate it with the actual acceleration of the universe because it is the simplest description we had until recently of the present cosmological observations. However, this may change with the next generation of experiments. If we can convince ourselves that the cosmic acceleration is not due to a constant, this would open up new fascinating avenues. By exploring the simplest cosmological model in the bulk, that of an empty and flat space with a cosmological constant Λ, we find that its holographic correspondence makes sense as a theory of fundamental quantum degrees of freedom at the boundary. Moreover, we find that an observer in the bulk, making longrange gravitational observations, cannot distinguish the acceleration induced by the cosmological constant Λ from that induced by the thermodynamic properties of the boundary, the de Sitter horizon, strictly at the level of the background cosmology. By including matter in the bulk we extend this holographic correspondence to GREA, where the quantum d.o.f. associated with the evolving boundary of the causal horizon induces an entropic acceleration that varies in time. Upcoming surveys such as DESI, Euclid, and the Vera Rubin Observatory (LSST) will test this framework through the growth of large-scale structures in the late universe, where GREA and ΛCDM differ quantitativelyThe author acknowledges support from the Spanish Research Project PID2024-159420NB-C43 [MICINN-FEDER], and the Centro de Excelencia Severo Ochoa Program CEX2020-001007-S at IFTElsevierDepartamento de Física TeóricaFacultad de CienciasGobierno de España20262026-04-14research articlehttp://purl.org/coar/resource_type/c_2df8fbb1VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/10486/764320https://dx.doi.org/10.1016/j.dark.2026.102319reponame:Biblos-e Archivo. Repositorio Institucional de la UAMinstname:Universidad Autónoma de MadridInglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:dnet:biblosearchi::16d05de41c4cccf1377582ac201efadf2026-06-23T12:46:27Z
dc.title.none.fl_str_mv GREA and dark energy: A holographic correspondence
title GREA and dark energy: A holographic correspondence
spellingShingle GREA and dark energy: A holographic correspondence
García-Bellido Capdevila, Juan
Dark energy
Holography
Accelerated expansion
Horizons
Física
title_short GREA and dark energy: A holographic correspondence
title_full GREA and dark energy: A holographic correspondence
title_fullStr GREA and dark energy: A holographic correspondence
title_full_unstemmed GREA and dark energy: A holographic correspondence
title_sort GREA and dark energy: A holographic correspondence
dc.creator.none.fl_str_mv García-Bellido Capdevila, Juan
author García-Bellido Capdevila, Juan
author_facet García-Bellido Capdevila, Juan
author_role author
dc.contributor.none.fl_str_mv Departamento de Física Teórica
Facultad de Ciencias
Gobierno de España
dc.subject.none.fl_str_mv Dark energy
Holography
Accelerated expansion
Horizons
Física
topic Dark energy
Holography
Accelerated expansion
Horizons
Física
description The nature of the cosmological constant is a mystery. We don’t understand its quantum origin but we associate it with the actual acceleration of the universe because it is the simplest description we had until recently of the present cosmological observations. However, this may change with the next generation of experiments. If we can convince ourselves that the cosmic acceleration is not due to a constant, this would open up new fascinating avenues. By exploring the simplest cosmological model in the bulk, that of an empty and flat space with a cosmological constant Λ, we find that its holographic correspondence makes sense as a theory of fundamental quantum degrees of freedom at the boundary. Moreover, we find that an observer in the bulk, making longrange gravitational observations, cannot distinguish the acceleration induced by the cosmological constant Λ from that induced by the thermodynamic properties of the boundary, the de Sitter horizon, strictly at the level of the background cosmology. By including matter in the bulk we extend this holographic correspondence to GREA, where the quantum d.o.f. associated with the evolving boundary of the causal horizon induces an entropic acceleration that varies in time. Upcoming surveys such as DESI, Euclid, and the Vera Rubin Observatory (LSST) will test this framework through the growth of large-scale structures in the late universe, where GREA and ΛCDM differ quantitatively
publishDate 2026
dc.date.none.fl_str_mv 2026
2026-04-14
dc.type.none.fl_str_mv research article
http://purl.org/coar/resource_type/c_2df8fbb1
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/10486/764320
https://dx.doi.org/10.1016/j.dark.2026.102319
url https://hdl.handle.net/10486/764320
https://dx.doi.org/10.1016/j.dark.2026.102319
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Biblos-e Archivo. Repositorio Institucional de la UAM
instname:Universidad Autónoma de Madrid
instname_str Universidad Autónoma de Madrid
reponame_str Biblos-e Archivo. Repositorio Institucional de la UAM
collection Biblos-e Archivo. Repositorio Institucional de la UAM
repository.name.fl_str_mv
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