Experimental constraints on the uncoupled Galileon model from SNLS3 data and other cosmological probes

J. Neveu 1, * V. Ruhlmann-Kleider 1 A. Conley 2 N. Palanque-Delabrouille 1 P. Astier 3 J. Guy 3 E. Babichev 4, 5
* Corresponding author
1 DPP - Département de Physique des Particules (ex SPP)
2 CASA - Center for Astrophysics and Space Astronomy [Boulder]
3 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
4 IAP - Institut d'Astrophysique de Paris
5 LPT - Laboratoire de Physique Théorique d'Orsay [Orsay]
Abstract : Aims. The Galileon model is a modified gravity theory that may provide an explanation for the accelerated expansion of the Universe. This model does not suffer from instabilities or ghost problems (normally associated with higher-order derivative theories), restores local General Relativity – thanks to the Vainshtein screening effect – and predicts late-time acceleration of the expansion.Methods. We derive a new definition of the Galileon parameters that allows us to avoid having to choose initial conditions for the Galileon field. We tested this model against precise measurements of the cosmological distances and the rate of growth of cosmic structures.Results. We observe a weak tension between the constraints set by growth data and those from distances. However, we find that the Galileon model remains consistent with current observations and is still competitive with the ΛCDM model, contrary to what was concluded in recent publications.
Keywords : supernovae: general cosmology: observations dark energy
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J. Neveu, V. Ruhlmann-Kleider, A. Conley, N. Palanque-Delabrouille, P. Astier, et al.. Experimental constraints on the uncoupled Galileon model from SNLS3 data and other cosmological probes. Astronomy and Astrophysics - A&A, EDP Sciences, 2013, 555, pp.A53. ⟨10.1051/0004-6361/201321256⟩. ⟨cea-01135404⟩

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