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In this Letter, we point out that redshift surveys can break the degeneracy between the galaxy bias, the power spectrum normalization, σ 8, 0 , and the growth factor, without the need for external information by using a simple and rather general parametrization for the growth rate, the well‐known γ parametrization and measuring the power spectrum at least at two different redshifts. We find that in next‐generation surveys like  Euclid , σ 8, 0  and γ can be measured to within 1 and 5 per cent, respectively, while the bias  b ( z ) can be measured to within 1–2 per cent in each of 14 equal‐width redshift bins spanning 0.7 ≤ z ≤ 2.

Simultaneous constraints on bias, normalization and growth index through power spectrum measurements