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We propose a new consistency test for the $\Lambda$CDM cosmology usingbaryonic acoustic oscillations (BAO) and redshift space distortion (RSD)measurements from galaxy redshift surveys. Specifically, we determine the peakposition of $f\sigma_8(z)$ in redshift $z$ offered by a RSD measurement, andcompare it to the one predicted by the BAO observables assuming a flat$\Lambda$CDM cosmology. We demonstrate this new test using the simulated datafor the DESI galaxy survey, and argue that this test complements those usingthe background observables alone, and is less subject to systematics in the RSDanalysis, compared to traditional methods using values of $f\sigma_8(z)$directly.

A new consistency test for $\Lambda$CDM cosmology using galaxy surveys