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The observational status of Galileon gravity after Planck

Barreira, A.; Li, B.; Baugh, C.M.; Pascoli, S.

The observational status of Galileon gravity after Planck Thumbnail


Authors

A. Barreira

C.M. Baugh



Abstract

We use the latest CMB data from Planck, together with BAO measurements, to constrain the full parameter space of Galileon gravity. We constrain separately the three main branches of the theory known as the Cubic, Quartic and Quintic models, and find that all yield a very good fit to these data. Unlike in ΛCDM, the Galileon model constraints are compatible with local determinations of the Hubble parameter and predict nonzero neutrino masses at over 5σ significance. We also identify that the low l part of the CMB lensing spectrum may be able to distinguish between ΛCDM and Galileon models. In the Cubic model, the lensing potential deepens at late times on sub-horizon scales, which is at odds with the current observational suggestion of a positive ISW effect. Compared to ΛCDM, the Quartic and Quintic models predict less ISW power in the low l region of the CMB temperature spectrum, and as such are slightly preferred by the Planck data. We illustrate that residual local modifications to gravity in the Quartic and Quintic models may render the Cubic model as the only branch of Galileon gravity that passes Solar System tests.

Journal Article Type Article
Acceptance Date Jul 31, 2014
Online Publication Date Aug 27, 2014
Publication Date Aug 27, 2014
Deposit Date Oct 2, 2014
Publicly Available Date Aug 26, 2016
Journal Journal of Cosmology and Astroparticle Physics
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 2014
Issue 08
Article Number 059
DOI https://doi.org/10.1088/1475-7516/2014/08/059
Public URL https://durham-repository.worktribe.com/output/1444760
Related Public URLs http://arxiv.org/abs/1406.0485

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Copyright Statement
This is an author-created, un-copyedited version of an article published in Journal of Cosmology and Astroparticle Physics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://dx.doi.org/10.1088/1475-7516/2014/08/059






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