Constraints from Cosmological Data on Expansion and Growth of Structure Observables in a Macroscopic Gravity Averaged Universe

We report recent results from investigating the effect of averaging inhomogeneities on cosmological distances and large-scale structure growth observables using the exact and covariant framework of Macroscopic Gravity (MG) averaging. For the MG formalism applied to the Friedmann-Lemaitre-Robertson-Walker (FLRW) metric, this gives an extra dynamical term encapsulated as an averaging density parameter denoted Ω_A. We analyze constraints on this parameter and its correlations with other cosmological parameters from using the CMB (Planck), distances to supernovae, Baryon Acoustic Oscillations, Hubble constant measurements, and the CFHTLenS and other recent data. We compare the amplitude of this effect to other systematic effects considered for future high precision surveys.