An effective fluid description of scalar-vector-tensor theories under the sub-horizon and quasi-static approximations

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorCiudad Universitaria Meléndez-
Autor(es): dc.creatorCardona, Wilmar-
Autor(es): dc.creatorOrjuela-Quintana, J. Bayron-
Autor(es): dc.creatorValenzuela-Toledo, César A.-
Data de aceite: dc.date.accessioned2025-08-21T15:11:27Z-
Data de disponibilização: dc.date.available2025-08-21T15:11:27Z-
Data de envio: dc.date.issued2023-07-29-
Data de envio: dc.date.issued2023-07-29-
Data de envio: dc.date.issued2022-08-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1088/1475-7516/2022/08/059-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/247614-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/247614-
Descrição: dc.descriptionWe consider scalar-vector-tensor (SVT) theories with second-order equations of motion and tensor propagation speed equivalent to the speed of light. Under the sub-horizon and the quasi-static approximations we find analytical formulae for an effective dark energy fluid, i.e., sound speed, anisotropic stress as well as energy density and pressure. We took advantage of our general, analytical fluid description and showed that it is possible to design SVT cosmological models which are degenerate with ΛCDM at the background level while having gravity strength G eff < G N at late-times as well as non-vanishing dark energy perturbations. We implemented SVT designer models in the widely used Boltzmann solver CLASS thus making it possible to test SVT models against astrophysical observations. Our effective fluid approach to SVT models reveals non trivial behaviour in the sound speed and the anisotropic stress well worth an investigation in light of current discrepancies in cosmological parameters such as H 0 and σ 8.-
Descrição: dc.descriptionICTP South American Institute for Fundamental Research & Instituto de Física Teórica Universidade Estadual Paulista-
Descrição: dc.descriptionDepartamento de Física Universidad del Valle Ciudad Universitaria Meléndez-
Descrição: dc.descriptionICTP South American Institute for Fundamental Research & Instituto de Física Teórica Universidade Estadual Paulista-
Idioma: dc.languageen-
Relação: dc.relationJournal of Cosmology and Astroparticle Physics-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectCosmological perturbation theory in GR and beyond-
Palavras-chave: dc.subjectdark energy theory-
Palavras-chave: dc.subjectGauss-Bonnet-Lovelock-Horndeski-Palatini etc gravity theories-
Palavras-chave: dc.subjectmodified gravity-
Título: dc.titleAn effective fluid description of scalar-vector-tensor theories under the sub-horizon and quasi-static approximations-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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