2019/04/12 by Ntelis, Pierros, Hawken, Adam James, Escoffier, Stephanie +2 · 1 citation
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences
paper · doi:10.48550/arxiv.1904.06135
In this paper, we study the normalised characteristic scale of transition to cosmic homogeneity, RH/dV, 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, ΩΛ = 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.