Testing deviations from $\Lambda$CDM with growth rate measurements from 6 Large Scale Structure Surveys at $\mathbf{z=0.06}$ to 1

Understand

We use measurements from the Planck satellite mission and galaxy redshift surveys over the last decade to test three of the basic assumptions of the standard model of cosmology, $\Lambda$CDM: the spatial curvature of the universe, the nature of dark energy and the laws of gravity on large scales.

• We obtain improved constraints on several scenarios that violate one or more of these assumptions.
• We measure $w_0=-0.94\pm0.17$ (18\% measurement) and $1+w_a=1.16\pm0.36$ (31\% measurement) for models with a time-dependent equation of state, which is an improvement over current best constraints \citep{Aubourg2014}.
• In the context of modified gravity, we consider popular scalar tensor models as well as a parametrization of the growth factor.