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

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

2012-01-12

arxiv.org/abs/1201.2455v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

6 pages, 4 figures, submitted to MNRAS Letters

Scientific paper

In this paper we point out that redshift surveys can break the degeneracy between the galaxy bias, the power spectrum normalization, \sigma_{8,0} and the growth factor, without the need for external information by using a simple and rather general parameterization for the growth rate, the well known \gamma-parameterization. We find that in next-generation surveys like Euclid \sigma_{8,0} and \gamma can be measured to within 1%, 5%, respectively, while the bias b(z) can be measured to within 1-2% in every redshift bin.

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