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We develop a code to produce the power spectrum in redshift space based onstandard perturbation theory (SPT) at 1-loop order. The code can be applied toa wide range of modified gravity and dark energy models using a recentlyproposed numerical method by A.Taruya. This includes Horndeski's theory with ageneral potential, which accommodates both chameleon and Vainshtein screeningmechanisms and provides a non-linear extension of the effective theory of darkenergy up to third order. Focus is on a recent non-linear model of the redshiftspace power spectrum which has been shown to model the anisotropy very well atrelevant scales for the SPT framework, as well as capturing relevant non-lineareffects typical of modified gravity theories. We provide consistency checks ofthe code against established results and elucidate it's application within thelight of upcoming high precision RSD data.

A Perturbative Approach to the Redshift Space Power Spectrum: Beyond the Standard Model