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• W3099132685 abstract "We show how to obtain constraints on $beta=f/b$, the ratio of the matter growth rate and the bias that quantifies the linear redshift-space distortions, that are independent of the cosmological model, using multiple tracers of large-scale structure. For a single tracer the uncertainties on $beta$ are constrained by the uncertainties in the amplitude and shape of the power spectrum, which is limited by cosmic variance. However, for two or more tracers this limit does not apply, since taking the ratio of power spectra cosmic variance cancels out, and in the linear (Kaiser) approximation one measures directly the quantity $(1+ beta_1 mu^2)^2/(1+ beta_2 mu^2)^2$, where $mu$ is the angle of a given mode with the line of sight. We provide analytic formulae for the Fisher matrix for one and two tracers, and quantify the signal-to-noise ratio needed to make effective use of the multiple-tracer technique. We also forecast the errors on $beta$ for a survey like Euclid." @default.
• W3099132685 created "2020-11-23" @default.
• W3099132685 creator A5015298982 @default.
• W3099132685 creator A5026909350 @default.
• W3099132685 date "2019-06-13" @default.
• W3099132685 modified "2023-09-24" @default.
• W3099132685 title "Fisher matrix for multiple tracers: model independent constraints on the redshift distortion parameter" @default.
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• W3099132685 doi "https://doi.org/10.1088/1475-7516/2019/06/030" @default.
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