Dark Energy predictions from GREA: Background and linear perturbation theory
General Relativistic Entropic Acceleration (GREA) theory provides a covariant formalism for out-of-equilibrium phenomena in GR, extending the Einstein equations with an entropic force that behaves like bulk viscosity with a negative effective pressure. In particular, the growth of entropy associated...
| Autor: | |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2024 |
| País: | España |
| Institución: | Universidad Autónoma de Madrid |
| Repositorio: | Biblos-e Archivo. Repositorio Institucional de la UAM |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.uam.es:10486/713088 |
| Acceso en línea: | http://hdl.handle.net/10486/713088 https://dx.doi.org/10.1016/j.dark.2024.101533 |
| Access Level: | acceso abierto |
| Palabra clave: | Dark Energy General Relativistic Entropic Acceleration Baryon Acoustic Oscillations Linear Perturbation Theory Redshift Space Distortions Física |
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Dark Energy predictions from GREA: Background and linear perturbation theoryGarcía-Bellido Capdevila, JuanDark EnergyGeneral Relativistic Entropic AccelerationBaryon Acoustic OscillationsLinear Perturbation TheoryRedshift Space DistortionsFísicaGeneral Relativistic Entropic Acceleration (GREA) theory provides a covariant formalism for out-of-equilibrium phenomena in GR, extending the Einstein equations with an entropic force that behaves like bulk viscosity with a negative effective pressure. In particular, the growth of entropy associated with the homogeneous causal horizon can explain the present acceleration of the Universe, without introducing a cosmological constant. The dynamics of the accelerated universe is characterized by a single parameter α, the ratio of the causal horizon to the curvature scale, which provides a unique history of the Universe distinguishable from that of ΛCDM. In particular, we explain the coincidence problem and the Hubble tension by shifting the coasting point to higher redshifts. All background observables are correlated among themselves due to their common dependence on α. This scenario gives a specific evolution for the effective equation of state parameter, w(a). Furthermore, we study the linear growth of matter perturbations in the context of a homogeneous expanding background driven by the entropy of the causal horizon. We find that the rate of growth of matter fluctuations in GREA slows down due to the accelerated expansion and alleviates the σ8 tension of ΛCDM. We compute the growth function of matter fluctuations, the redshift space distortions in the galaxy correlation function, as well as the redshift evolution of the baryon acoustic oscillation scale, and find that the integrated Sachs-Wolfe effect is significantly larger than in ΛCDM. It is interesting to note that many of the tensions and anomalies of the standard model of cosmology are alleviated by the inclusion of this transient period of acceleration of the Universe based on known fundamental physics. In the near future we will be able to constrain this theory with present data from deep galaxy surveysAcknowledges support from the Spanish Research Project PID2021123012NB-C43 [MICINN-FEDER], and the Centro de Excelencia Severo Ochoa Program CEX2020-001007-S at IFTElsevierDepartamento de Física TeóricaFacultad de Ciencias20242024-05-23research articlehttp://purl.org/coar/resource_type/c_2df8fbb1VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10486/713088https://dx.doi.org/10.1016/j.dark.2024.101533reponame: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:repositorio.uam.es:10486/7130882026-06-23T12:46:27Z |
| dc.title.none.fl_str_mv |
Dark Energy predictions from GREA: Background and linear perturbation theory |
| title |
Dark Energy predictions from GREA: Background and linear perturbation theory |
| spellingShingle |
Dark Energy predictions from GREA: Background and linear perturbation theory García-Bellido Capdevila, Juan Dark Energy General Relativistic Entropic Acceleration Baryon Acoustic Oscillations Linear Perturbation Theory Redshift Space Distortions Física |
| title_short |
Dark Energy predictions from GREA: Background and linear perturbation theory |
| title_full |
Dark Energy predictions from GREA: Background and linear perturbation theory |
| title_fullStr |
Dark Energy predictions from GREA: Background and linear perturbation theory |
| title_full_unstemmed |
Dark Energy predictions from GREA: Background and linear perturbation theory |
| title_sort |
Dark Energy predictions from GREA: Background and linear perturbation theory |
| 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 |
| dc.subject.none.fl_str_mv |
Dark Energy General Relativistic Entropic Acceleration Baryon Acoustic Oscillations Linear Perturbation Theory Redshift Space Distortions Física |
| topic |
Dark Energy General Relativistic Entropic Acceleration Baryon Acoustic Oscillations Linear Perturbation Theory Redshift Space Distortions Física |
| description |
General Relativistic Entropic Acceleration (GREA) theory provides a covariant formalism for out-of-equilibrium phenomena in GR, extending the Einstein equations with an entropic force that behaves like bulk viscosity with a negative effective pressure. In particular, the growth of entropy associated with the homogeneous causal horizon can explain the present acceleration of the Universe, without introducing a cosmological constant. The dynamics of the accelerated universe is characterized by a single parameter α, the ratio of the causal horizon to the curvature scale, which provides a unique history of the Universe distinguishable from that of ΛCDM. In particular, we explain the coincidence problem and the Hubble tension by shifting the coasting point to higher redshifts. All background observables are correlated among themselves due to their common dependence on α. This scenario gives a specific evolution for the effective equation of state parameter, w(a). Furthermore, we study the linear growth of matter perturbations in the context of a homogeneous expanding background driven by the entropy of the causal horizon. We find that the rate of growth of matter fluctuations in GREA slows down due to the accelerated expansion and alleviates the σ8 tension of ΛCDM. We compute the growth function of matter fluctuations, the redshift space distortions in the galaxy correlation function, as well as the redshift evolution of the baryon acoustic oscillation scale, and find that the integrated Sachs-Wolfe effect is significantly larger than in ΛCDM. It is interesting to note that many of the tensions and anomalies of the standard model of cosmology are alleviated by the inclusion of this transient period of acceleration of the Universe based on known fundamental physics. In the near future we will be able to constrain this theory with present data from deep galaxy surveys |
| publishDate |
2024 |
| dc.date.none.fl_str_mv |
2024 2024-05-23 |
| 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 |
http://hdl.handle.net/10486/713088 https://dx.doi.org/10.1016/j.dark.2024.101533 |
| url |
http://hdl.handle.net/10486/713088 https://dx.doi.org/10.1016/j.dark.2024.101533 |
| 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/ |
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info:eu-repo/semantics/openAccess |
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open access http://purl.org/coar/access_right/c_abf2 Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ |
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openAccess |
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application/pdf |
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Elsevier |
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Elsevier |
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reponame:Biblos-e Archivo. Repositorio Institucional de la UAM instname:Universidad Autónoma de Madrid |
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Universidad Autónoma de Madrid |
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Biblos-e Archivo. Repositorio Institucional de la UAM |
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Biblos-e Archivo. Repositorio Institucional de la UAM |
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