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

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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, σ₈,₀ 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, σ₈,₀ and γcan be measured to within 1% and 5%, respectively, while the bias b(z) can be measured to within 1-2% in each of 14 equal-width redshift bins spanning 0.7<=z<=2.