| Full text | |
| Author(s): |
Abramo, L. Raul
;
Amendola, Luca
Total Authors: 2
|
| Document type: | Journal article |
| Source: | Journal of Cosmology and Astroparticle Physics; v. N/A, n. 6, p. 18-pg., 2019-06-01. |
| 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 broken vertical bar beta(1)mu(2))(2) /(1 broken vertical bar 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. (AU) | |
| FAPESP's process: | 18/04683-9 - Large-scale structure in the local Universe with the S-PLUS survey |
| Grantee: | Luis Raul Weber Abramo |
| Support Opportunities: | Regular Research Grants |