Papers › The scale of cosmic homogeneity as a standard ruler
The scale of cosmic homogeneity as a standard ruler
Pierros Ntelis, Anne Ealet, Stephanie Escoffier, Jean-Christophe Hamilton, Adam James Hawken, Jean-Marc Le Goff, James Rich, Andre Tilquin
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In this paper, we study the characteristic scale of transition to cosmic homogeneity of the universe, ℛ_H, as a standard ruler, to constrain cosmological parameters on mock galaxy catalogues. We use mock galaxy catalogues that simulate the CMASS galaxy sample of the BOSS survey in the redshift range 0.43 ≤z ≤0.7. In each redshift bin we obtain the homogeneity scale, defined as the scale at which the universe becomes homogeneous to 1%, i.e. D₂(ℛ_H) = 2.97. With a simple Fisher analysis, we find that the performance of measuring the cosmological parameters with either the position of the BAO peak or the homogeneity scale is comparable. We show that ℛ_H has a dependence on the galaxy bias. If the accuracy and precision of this bias is achieved to 1%, as expected for future surveys, then ℛ_H is a competitive standard ruler.
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