First experimental constraints on the disformally coupled Galileon model - Université Pierre et Marie Curie Accéder directement au contenu
Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2014

First experimental constraints on the disformally coupled Galileon model

Résumé

Aims. The Galileon model is a modified gravity model that can explain the late-time accelerated expansion of the Universe. In a previous work, we derived experimental constraints on the Galileon model with no explicit coupling to matter and showed that this model agrees with the most recent cosmological data. In the context of braneworld constructions or massive gravity, the Galileon model exhibits a disformal coupling to matter, which we study in this paper.Methods. After comparing our constraints on the uncoupled model with recent studies, we extend the analysis framework to the disformally coupled Galileon model and derive the first experimental constraints on that coupling, using precise measurements of cosmological distances and the growth rate of cosmic structures.Results. In the uncoupled case, with updated data, we still observe a low tension between the constraints set by growth data and those from distances. In the disformally coupled Galileon model, we obtain better agreement with data and favour a non-zero disformal coupling to matter at the 2.5σ level. This gives an interesting hint of the possible braneworld origin of Galileon theory.
Fichier principal
Vignette du fichier
aa23758-14.pdf (1.76 Mo) Télécharger le fichier
Origine : Publication financée par une institution
Loading...

Dates et versions

cea-01271059 , version 1 (08-02-2016)

Identifiants

Citer

J. Neveu, V. Ruhlmann-Kleider, P. Astier, M. Besançon, A. Conley, et al.. First experimental constraints on the disformally coupled Galileon model. Astronomy and Astrophysics - A&A, 2014, 569, pp.A90. ⟨10.1051/0004-6361/201423758⟩. ⟨cea-01271059⟩
225 Consultations
107 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More