Non-comoving cosmology.

One of the fundamental assumptions of the standard Lambda CDM cosmology is that, on large scales, all the matter-energy components of the Universe share a common rest frame. This seems natural for the visible sector, that has been in thermal contact and tightly coupled in the primeval Universe. The...

Descripción completa

Detalles Bibliográficos
Autores: Ruiz Cembranos, José Alberto, López Maroto, Antonio, Villarrubia Rojo, Héctor
Tipo de recurso: artículo
Fecha de publicación:2019
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/13557
Acceso en línea:https://hdl.handle.net/20.500.14352/13557
Access Level:acceso abierto
Palabra clave:53
Perturbations
Anisotropy
Constraints
Galaxies
Universe.
Física (Física)
22 Física
id ES_f89efb58a54aae3f8d79ee34e6d32eb4
oai_identifier_str oai:docta.ucm.es:20.500.14352/13557
network_acronym_str ES
network_name_str España
repository_id_str
spelling Non-comoving cosmology.Ruiz Cembranos, José AlbertoLópez Maroto, AntonioVillarrubia Rojo, Héctor53PerturbationsAnisotropyConstraintsGalaxiesUniverse.Física (Física)22 FísicaOne of the fundamental assumptions of the standard Lambda CDM cosmology is that, on large scales, all the matter-energy components of the Universe share a common rest frame. This seems natural for the visible sector, that has been in thermal contact and tightly coupled in the primeval Universe. The dark sector, on the other hand, does not have any non-gravitational interaction known to date and therefore, there is no a priori reason to impose that it is comoving with ordinary matter. In this work we explore the consequences of relaxing this assumption and study the cosmology of non-comoving fluids. We show that it is possible to construct a homogeneous and isotropic cosmology with a collection of fluids moving with non-relativistic velocities. Our model extends Lambda CDM with the addition of a single free parameter beta(0), the initial velocity of the visible sector with respect to the frame that observes a homogeneous and isotropic universe. This modification gives rise to a rich phenomenology, while being consistent with current observations for beta(0) < 1.6 x 10(-3) (95% CL). This work establishes the general framework to describe a non-comoving cosmology and extracts its first observational consequences for large-scale structure. Among the observable effects, we find sizeable modifications in the density-velocity and density-lensing potential cross-correlation spectra. These corrections give rise to deviations from statistical isotropy with a dipolar structure. The relative motion between the different fluids also couples the vector and scalar modes, the latter acting as sources for metric vector modes and vorticity for all the species.IOP PublishingUniversidad Complutense de Madrid20192019-06-1820192019-06-18journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/13557reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/135572026-06-02T12:44:21Z
dc.title.none.fl_str_mv Non-comoving cosmology.
title Non-comoving cosmology.
spellingShingle Non-comoving cosmology.
Ruiz Cembranos, José Alberto
53
Perturbations
Anisotropy
Constraints
Galaxies
Universe.
Física (Física)
22 Física
title_short Non-comoving cosmology.
title_full Non-comoving cosmology.
title_fullStr Non-comoving cosmology.
title_full_unstemmed Non-comoving cosmology.
title_sort Non-comoving cosmology.
dc.creator.none.fl_str_mv Ruiz Cembranos, José Alberto
López Maroto, Antonio
Villarrubia Rojo, Héctor
author Ruiz Cembranos, José Alberto
author_facet Ruiz Cembranos, José Alberto
López Maroto, Antonio
Villarrubia Rojo, Héctor
author_role author
author2 López Maroto, Antonio
Villarrubia Rojo, Héctor
author2_role author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 53
Perturbations
Anisotropy
Constraints
Galaxies
Universe.
Física (Física)
22 Física
topic 53
Perturbations
Anisotropy
Constraints
Galaxies
Universe.
Física (Física)
22 Física
description One of the fundamental assumptions of the standard Lambda CDM cosmology is that, on large scales, all the matter-energy components of the Universe share a common rest frame. This seems natural for the visible sector, that has been in thermal contact and tightly coupled in the primeval Universe. The dark sector, on the other hand, does not have any non-gravitational interaction known to date and therefore, there is no a priori reason to impose that it is comoving with ordinary matter. In this work we explore the consequences of relaxing this assumption and study the cosmology of non-comoving fluids. We show that it is possible to construct a homogeneous and isotropic cosmology with a collection of fluids moving with non-relativistic velocities. Our model extends Lambda CDM with the addition of a single free parameter beta(0), the initial velocity of the visible sector with respect to the frame that observes a homogeneous and isotropic universe. This modification gives rise to a rich phenomenology, while being consistent with current observations for beta(0) < 1.6 x 10(-3) (95% CL). This work establishes the general framework to describe a non-comoving cosmology and extracts its first observational consequences for large-scale structure. Among the observable effects, we find sizeable modifications in the density-velocity and density-lensing potential cross-correlation spectra. These corrections give rise to deviations from statistical isotropy with a dipolar structure. The relative motion between the different fluids also couples the vector and scalar modes, the latter acting as sources for metric vector modes and vorticity for all the species.
publishDate 2019
dc.date.none.fl_str_mv 2019
2019-06-18
2019
2019-06-18
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/13557
url https://hdl.handle.net/20.500.14352/13557
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
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
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv IOP Publishing
publisher.none.fl_str_mv IOP Publishing
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869425019118944256
score 15.301603

Similares en LA Referencia