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Do current cosmological observations rule out all Covariant Galileons? · Around

2017

Do current cosmological observations rule out all Covariant Galileons?

Peirone, Simone, Frusciante, Noemi, Hu, Bin et al.

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We revisit the cosmology of Covariant Galileon gravity in view of the most recent cosmological data sets, including weak lensing.

As a higher derivative theory, Covariant Galileon models do not have a $\Lambda$CDM limit and predict a very different structure formation pattern compared with the standard $\Lambda$CDM scenario.
Previous cosmological analyses suggest that this model is marginally disfavoured, yet can not be completely ruled out.
In this work we use a more recent and extended combination of data, and we allow for more freedom in the cosmology, by including a massive neutrino sector with three different mass hierarchies.

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