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We perform a validation of estimates of the growth rate of structure,described by the parameter combination $f\sigma_8$, in modified gravitycosmologies. We consider an analysis pipeline based on the redshift-spacedistortion modelling of the clustering wedges statistic of the galaxycorrelation function and apply it to mock catalogues of $\Lambda{\rm CDM}$ andthe normal branch of DGP cosmologies. We employ a halo occupation distributionapproach to construct our mocks, which we ensure resemble the CMASS sample fromBOSS in terms of the total galaxy number density and large scale amplitude ofthe power spectrum monopole. We show that the clustering wedges modelsuccessfully recovers the true growth rate difference between DGP and$\Lambda{\rm CDM}$, even for cases with over 40\% enhancement in $f\sigma_8$compared to $\Lambda{\rm CDM}$. The unbiased performance of the clusteringwedges model allows us to use the growth rate values estimated from the BOSSDR12 data to constrain the cross-over scale $r_c$ of DGP gravity to$\left[r_cH_0\right]^{-1} < 0.97$ ($2\sigma$) or $r_c > 3090\ {\rm Mpc}/h$,cutting into the interesting region of parameter space with $r_c \sim H_0^{-1}$using constraints from the growth of structure alone.

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