Holographic energy density, dark energy sound speed, and tensions in cosmological parameters: H0 and S8
Autor(a) principal: | |
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Data de Publicação: | 2023 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1088/1475-7516/2023/02/045 http://hdl.handle.net/11449/248416 |
Resumo: | Interesting discrepancies in cosmological parameters are challenging the success of the ΛCDM model. Direct measurements of the Hubble constant H 0 using Cepheid variables and supernovae turn out to be higher than inferred from the Cosmic Microwave Background (CMB). Weak galaxy lensing surveys consistently report values of the strength of matter clustering σ8 lower than values derived from the CMB in the context of ΛCDM. In this paper we address these discrepancies in cosmological parameters by considering Dark Energy (DE) as a fluid with evolving equation of state wde(z), constant sound speed squared ĉs2, and vanishing anisotropic stress σ. Our wde(z) is derived from the Holographic Principle and can consecutively exhibit radiation-like, matter-like, and DE-like behaviour, thus affecting the sound horizon and the comoving angular diameter distance, hence H0. Here we show DE sound speed plays a part in the matter clustering behaviour through its effect on the evolution of the gravitational potential. We compute cosmological constraints using several data set combinations including primary CMB, CMB lensing, redshift-space-distortions, local distance-ladder, supernovae, and baryon acoustic oscillations. In our analysis we marginalise over ĉs2 and find ĉs2 = 1 is excluded at ≳ 3σ. For our baseline result including the whole data set we found H0 and σ8 in good agreement (within ≈ 2σ) with low redshift probes. Our constraint for the baryon energy density ωb is however in ≈ 3σ tension with BBN constraints. We conclude evolving DE also having non-standard clustering properties [e.g., ĉs2(z,k)] might be relevant for the solution of current discrepancies in cosmological parameters. |
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Holographic energy density, dark energy sound speed, and tensions in cosmological parameters: H0 and S8cosmological parameters from CMBRcosmological parameters from LSSdark energy theoryInteresting discrepancies in cosmological parameters are challenging the success of the ΛCDM model. Direct measurements of the Hubble constant H 0 using Cepheid variables and supernovae turn out to be higher than inferred from the Cosmic Microwave Background (CMB). Weak galaxy lensing surveys consistently report values of the strength of matter clustering σ8 lower than values derived from the CMB in the context of ΛCDM. In this paper we address these discrepancies in cosmological parameters by considering Dark Energy (DE) as a fluid with evolving equation of state wde(z), constant sound speed squared ĉs2, and vanishing anisotropic stress σ. Our wde(z) is derived from the Holographic Principle and can consecutively exhibit radiation-like, matter-like, and DE-like behaviour, thus affecting the sound horizon and the comoving angular diameter distance, hence H0. Here we show DE sound speed plays a part in the matter clustering behaviour through its effect on the evolution of the gravitational potential. We compute cosmological constraints using several data set combinations including primary CMB, CMB lensing, redshift-space-distortions, local distance-ladder, supernovae, and baryon acoustic oscillations. In our analysis we marginalise over ĉs2 and find ĉs2 = 1 is excluded at ≳ 3σ. For our baseline result including the whole data set we found H0 and σ8 in good agreement (within ≈ 2σ) with low redshift probes. Our constraint for the baryon energy density ωb is however in ≈ 3σ tension with BBN constraints. We conclude evolving DE also having non-standard clustering properties [e.g., ĉs2(z,k)] might be relevant for the solution of current discrepancies in cosmological parameters.ICTP South American Institute for Fundamental Research Instituto de Física Teórica Universidade Estadual PaulistaPrograma de Física Universidad del Atlántico, Carrera 30 Número 8-49, AtlánticoICTP South American Institute for Fundamental Research Instituto de Física Teórica Universidade Estadual PaulistaUniversidade Estadual Paulista (UNESP)Universidad del AtlánticoCardona, Wilmar [UNESP]Sabogal, M. A.2023-07-29T13:43:28Z2023-07-29T13:43:28Z2023-02-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1088/1475-7516/2023/02/045Journal of Cosmology and Astroparticle Physics, v. 2023, n. 2, 2023.1475-7516http://hdl.handle.net/11449/24841610.1088/1475-7516/2023/02/0452-s2.0-85148861165Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Cosmology and Astroparticle Physicsinfo:eu-repo/semantics/openAccess2023-07-29T13:43:28Zoai:repositorio.unesp.br:11449/248416Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T18:03:06.019676Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Holographic energy density, dark energy sound speed, and tensions in cosmological parameters: H0 and S8 |
title |
Holographic energy density, dark energy sound speed, and tensions in cosmological parameters: H0 and S8 |
spellingShingle |
Holographic energy density, dark energy sound speed, and tensions in cosmological parameters: H0 and S8 Cardona, Wilmar [UNESP] cosmological parameters from CMBR cosmological parameters from LSS dark energy theory |
title_short |
Holographic energy density, dark energy sound speed, and tensions in cosmological parameters: H0 and S8 |
title_full |
Holographic energy density, dark energy sound speed, and tensions in cosmological parameters: H0 and S8 |
title_fullStr |
Holographic energy density, dark energy sound speed, and tensions in cosmological parameters: H0 and S8 |
title_full_unstemmed |
Holographic energy density, dark energy sound speed, and tensions in cosmological parameters: H0 and S8 |
title_sort |
Holographic energy density, dark energy sound speed, and tensions in cosmological parameters: H0 and S8 |
author |
Cardona, Wilmar [UNESP] |
author_facet |
Cardona, Wilmar [UNESP] Sabogal, M. A. |
author_role |
author |
author2 |
Sabogal, M. A. |
author2_role |
author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (UNESP) Universidad del Atlántico |
dc.contributor.author.fl_str_mv |
Cardona, Wilmar [UNESP] Sabogal, M. A. |
dc.subject.por.fl_str_mv |
cosmological parameters from CMBR cosmological parameters from LSS dark energy theory |
topic |
cosmological parameters from CMBR cosmological parameters from LSS dark energy theory |
description |
Interesting discrepancies in cosmological parameters are challenging the success of the ΛCDM model. Direct measurements of the Hubble constant H 0 using Cepheid variables and supernovae turn out to be higher than inferred from the Cosmic Microwave Background (CMB). Weak galaxy lensing surveys consistently report values of the strength of matter clustering σ8 lower than values derived from the CMB in the context of ΛCDM. In this paper we address these discrepancies in cosmological parameters by considering Dark Energy (DE) as a fluid with evolving equation of state wde(z), constant sound speed squared ĉs2, and vanishing anisotropic stress σ. Our wde(z) is derived from the Holographic Principle and can consecutively exhibit radiation-like, matter-like, and DE-like behaviour, thus affecting the sound horizon and the comoving angular diameter distance, hence H0. Here we show DE sound speed plays a part in the matter clustering behaviour through its effect on the evolution of the gravitational potential. We compute cosmological constraints using several data set combinations including primary CMB, CMB lensing, redshift-space-distortions, local distance-ladder, supernovae, and baryon acoustic oscillations. In our analysis we marginalise over ĉs2 and find ĉs2 = 1 is excluded at ≳ 3σ. For our baseline result including the whole data set we found H0 and σ8 in good agreement (within ≈ 2σ) with low redshift probes. Our constraint for the baryon energy density ωb is however in ≈ 3σ tension with BBN constraints. We conclude evolving DE also having non-standard clustering properties [e.g., ĉs2(z,k)] might be relevant for the solution of current discrepancies in cosmological parameters. |
publishDate |
2023 |
dc.date.none.fl_str_mv |
2023-07-29T13:43:28Z 2023-07-29T13:43:28Z 2023-02-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1088/1475-7516/2023/02/045 Journal of Cosmology and Astroparticle Physics, v. 2023, n. 2, 2023. 1475-7516 http://hdl.handle.net/11449/248416 10.1088/1475-7516/2023/02/045 2-s2.0-85148861165 |
url |
http://dx.doi.org/10.1088/1475-7516/2023/02/045 http://hdl.handle.net/11449/248416 |
identifier_str_mv |
Journal of Cosmology and Astroparticle Physics, v. 2023, n. 2, 2023. 1475-7516 10.1088/1475-7516/2023/02/045 2-s2.0-85148861165 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Cosmology and Astroparticle Physics |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128888835932160 |