Papers › Cosmological constraints from cosmic homogeneity
Cosmological constraints from cosmic homogeneity
Pierros Ntelis, Adam James Hawken, Stephanie Escoffier, Anne Ealet, Andre Tilquin
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In this paper, we study the normalised characteristic scale of transition to cosmic homogeneity, ℛ_H/d_V, as a cosmological probe. We use a compilation of SDSS galaxy samples, comprising more than 10⁶ galaxies in the redshift range 0.17 ≤z ≤2.2 within the largest comoving volume to date, ∼8 h⁻³Gpc³. We show that these samples can be described by a single bias model as a function of redshift. By combining our measurements with prior Cosmic Microwave Background and Lensing information from the Planck satellite, we constrain the total matter density ratio of the universe, Ωₘ = 0.363 ±0.025, and the Dark Energy density ratio, Ω_Λ = 0.649 ±0.021, improving the values from Planck alone by 31% and 28%, respectively. Our results are compatible with a flat ΛCDM model. These results show the complementarity of the normalised homogeneity scale with other cosmological probes and open new roads to cosmometry.
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