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In the standard (classic) approach, galaxy clustering measurements fromspectroscopic surveys are compressed into baryon acoustic oscillations andredshift space distortions measurements, which in turn can be compared tocosmological models. Recent works have shown that avoiding this intermediatestep and fitting directly the full power spectrum signal (full modelling) leadsto much tighter constraints on cosmological parameters. Here we show where thisextra information is coming from and extend the classic approach with oneadditional effective parameter, such that it captures, effectively, the sameamount of information as the full modelling approach, but in amodel-independent way. We validate this new method (ShapeFit) on mock catalogs,and compare its performance to the full modelling approach finding both todeliver equivalent results. The ShapeFit extension of the classic approachpromotes the standard analyses at the level of full modelling ones in terms ofinformation content, with the advantages of i) being more model independent;ii) offering an understanding of the origin of the extra cosmologicalinformation; iii) allowing a robust control on the impact of observationalsystematics.

ShapeFit: extracting the power spectrum shape information in galaxy surveys beyond BAO and RSD