http://arxiv.org/abs/1404.1365
We show that, in the presence of massive neutrinos, the Galileon gravity model provides a very good fit to the current CMB temperature, CMB lensing and BAO data. This model, which we dub $nu$Galileon, contains the same set of free parameters as $Lambdarm{CDM}$, although it leads to different background dynamics and nontrivial gravitational interactions. The data provide compelling evidence ($gtrsim 6sigma$) for nonzero neutrino masses, with $Sigma m_nu gtrsim 0.4 {rm eV}$ at the $2sigma$ level. Upcoming precision terrestrial measurements of the absolute neutrino mass scale therefore have the potential to test this model. We show that CMB lensing measurements at multipoles $l lesssim 40$ will be able to discriminate between the $nu$Galileon and $Lambdarm{CDM}$ models. Unlike $Lambdarm{CDM}$, the $nu$Galileon model is consistent with local determinations of the Hubble parameter. The presence of the massive neutrinos lowers the value of $sigma_8$ substantially, which suggests that $nu$Galileon may also provide a good fit to data that probe the growth rate of structure.
A. Barreira, B. Li, C. Baugh, et. al.
Mon, 7 Apr 14
26/35
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