First experimental constraints on the disformally coupled Galileon model
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.