Validating estimates of the growth rate of structure with modified gravity simulations

We perform a validation of estimates of the growth rate of structure, described by the parameter combination f₈, in modified gravity cosmologies. We consider an analysis pipeline based on the redshift-space distortion modeling of the clustering wedges statistic of the galaxy correlation function and apply it to mock catalogues of Lambda cold dark matter () and the normal branch of Dvali-Gabadadze-Porrati (DGP) cosmologies. We employ a halo occupation distribution approach to construct our mocks, which we ensure resemble the CMASS sample from Baryon Oscillation Spectroscopic Survey (BOSS) in terms of the total galaxy number density and large-scale amplitude of the power spectrum monopole. We show that the clustering wedges model successfully recovers the true growth rate difference between DGP and, even for cases with over 40% enhancement in f₈ compared to. The unbiased performance of the clustering wedges model allows us to use the growth rate values estimated from the BOSS DR12 data to constrain the crossover scale r₂ of DGP gravity to {r₂H₀}^-13090 Mpc/h, cutting into the interesting region of parameter space with r₂H₀^-1 using constraints from the growth of structure alone.