Experimental constraints on the uncoupled Galileon model from SNLS3 data and other cosmological probes
arXiv:1302.2786 · doi:10.1051/0004-6361/201321256
Abstract
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. In this paper, we derive a new definition of the Galileon parameters that allows us to avoid having to choose initial conditions for the Galileon field, and then test this model against precise measurements of the cosmological distances and the rate of growth of cosmic structures. We observe a small 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.
19 pages, 15 figures, accepted to Astronomy and Astrophysics
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- Gravity in the Era of Equality: Towards solutions to the Hubble problem without fine-tuned initial conditions
- Weakly Broken Galileon Symmetry
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- Halo model and halo properties in Galileon gravity cosmologies
- Effective field theory of modified gravity with two scalar fields: dark energy and dark matter
- Screening the fifth force in the Horndeski's most general scalar-tensor theories
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- Dark energy scenario consistent with GW170817 in theories beyond Horndeski gravity
- Cosmology in generalized Horndeski theories with second-order equations of motion
- Dynamical Analysis of an Integrable Cubic Galileon Cosmological Model
- Speeding up -body simulations of modified gravity: Chameleon screening models
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- Constraining the CDM and Galileon models with recent cosmological data
- First experimental constraints on the disformally coupled Galileon model
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- Growth of Matter Perturbations in the Bi-Galileons Field Model
- Distinguishing modified gravity models
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- Cosmological Tests of Coupled Galileons
- Non-minimally coupled quintessence DE model with a cubic galileon term --A Dynamical System Analysis
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