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

Authors

  • Cinzia Di Porto,

    Corresponding author
    1. INAF - Osservatorio Astronomico di Bologna, Via Ranzani 1, 40127 Bologna, Italy
    2. INFN, Sezione di Bologna, I-40127 Bologna, Italy
    3. Institut finline imager Theoretische Physik, Universitinline imaget Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany
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  • Luca Amendola,

    1. Institut finline imager Theoretische Physik, Universitinline imaget Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany
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  • Enzo Branchini

    1. Dipartimento di Fisica ‘E. Amaldi’, Universitá degli Studi ‘Roma Tre’, via della Vasca Navale 84, 00146 Roma, Italy
    2. INFN Sezione di Roma Tre and INAF, Osservatorio Astronomico di Brera, Milano, Italy
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E-mail: cinzia.diporto@oabo.inaf.it

ABSTRACT

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 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.

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