An effective fluid description of scalar-vector-tensor theories under the sub-horizon and quasi-static approximations
Autor(a) principal: | |
---|---|
Data de Publicação: | 2022 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1088/1475-7516/2022/08/059 http://hdl.handle.net/11449/247614 |
Resumo: | We 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. |
id |
UNSP_83a728d59d186250a0ea738ef6d12b28 |
---|---|
oai_identifier_str |
oai:repositorio.unesp.br:11449/247614 |
network_acronym_str |
UNSP |
network_name_str |
Repositório Institucional da UNESP |
repository_id_str |
2946 |
spelling |
An effective fluid description of scalar-vector-tensor theories under the sub-horizon and quasi-static approximationsCosmological perturbation theory in GR and beyonddark energy theoryGauss-Bonnet-Lovelock-Horndeski-Palatini etc gravity theoriesmodified gravityWe 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.ICTP South American Institute for Fundamental Research & Instituto de Física Teórica Universidade Estadual PaulistaDepartamento de Física Universidad del Valle Ciudad Universitaria MeléndezICTP South American Institute for Fundamental Research & Instituto de Física Teórica Universidade Estadual PaulistaUniversidade Estadual Paulista (UNESP)Ciudad Universitaria MeléndezCardona, Wilmar [UNESP]Orjuela-Quintana, J. BayronValenzuela-Toledo, César A.2023-07-29T13:20:53Z2023-07-29T13:20:53Z2022-08-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1088/1475-7516/2022/08/059Journal of Cosmology and Astroparticle Physics, v. 2022, n. 8, 2022.1475-7516http://hdl.handle.net/11449/24761410.1088/1475-7516/2022/08/0592-s2.0-85137880343Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Cosmology and Astroparticle Physicsinfo:eu-repo/semantics/openAccess2023-07-29T13:20:53Zoai:repositorio.unesp.br:11449/247614Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T13:34:10.475044Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
An effective fluid description of scalar-vector-tensor theories under the sub-horizon and quasi-static approximations |
title |
An effective fluid description of scalar-vector-tensor theories under the sub-horizon and quasi-static approximations |
spellingShingle |
An effective fluid description of scalar-vector-tensor theories under the sub-horizon and quasi-static approximations Cardona, Wilmar [UNESP] Cosmological perturbation theory in GR and beyond dark energy theory Gauss-Bonnet-Lovelock-Horndeski-Palatini etc gravity theories modified gravity |
title_short |
An effective fluid description of scalar-vector-tensor theories under the sub-horizon and quasi-static approximations |
title_full |
An effective fluid description of scalar-vector-tensor theories under the sub-horizon and quasi-static approximations |
title_fullStr |
An effective fluid description of scalar-vector-tensor theories under the sub-horizon and quasi-static approximations |
title_full_unstemmed |
An effective fluid description of scalar-vector-tensor theories under the sub-horizon and quasi-static approximations |
title_sort |
An effective fluid description of scalar-vector-tensor theories under the sub-horizon and quasi-static approximations |
author |
Cardona, Wilmar [UNESP] |
author_facet |
Cardona, Wilmar [UNESP] Orjuela-Quintana, J. Bayron Valenzuela-Toledo, César A. |
author_role |
author |
author2 |
Orjuela-Quintana, J. Bayron Valenzuela-Toledo, César A. |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (UNESP) Ciudad Universitaria Meléndez |
dc.contributor.author.fl_str_mv |
Cardona, Wilmar [UNESP] Orjuela-Quintana, J. Bayron Valenzuela-Toledo, César A. |
dc.subject.por.fl_str_mv |
Cosmological perturbation theory in GR and beyond dark energy theory Gauss-Bonnet-Lovelock-Horndeski-Palatini etc gravity theories modified gravity |
topic |
Cosmological perturbation theory in GR and beyond dark energy theory Gauss-Bonnet-Lovelock-Horndeski-Palatini etc gravity theories modified gravity |
description |
We 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. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-08-01 2023-07-29T13:20:53Z 2023-07-29T13:20:53Z |
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/10.1088/1475-7516/2022/08/059 Journal of Cosmology and Astroparticle Physics, v. 2022, n. 8, 2022. 1475-7516 http://hdl.handle.net/11449/247614 10.1088/1475-7516/2022/08/059 2-s2.0-85137880343 |
url |
http://dx.doi.org/10.1088/1475-7516/2022/08/059 http://hdl.handle.net/11449/247614 |
identifier_str_mv |
Journal of Cosmology and Astroparticle Physics, v. 2022, n. 8, 2022. 1475-7516 10.1088/1475-7516/2022/08/059 2-s2.0-85137880343 |
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_ |
1808128248484200448 |