Exploring cosmic homogeneity with the BOSS DR12 galaxy sample

Pierros Ntelis (1) , Jean-Christophe Hamilton (1) , Jean-Marc Le Goff (2) , Etienne Burtin (2) , Pierre Laurent (2) , James Rich (2) , Nicolas Guillermo Busca (1) , Jeremy Tinker , Eric Aubourg (1) , H. Bourboux (2) , Julian Bautista , Nathalie Palanque Delabrouille (2) , Timoth Delubac , Sarah Eftekharzadeh , David W. Hogg , Adam Myers , Mariana Vargas-Magaña , Isabelle Pâris (3) , Partick Petitjean (4) , Graziano Rossi , Donald P. Schneider , Rita Tojeiro , Christophe Yeche (2)

1 APC (UMR_7164) - AstroParticule et Cosmologie
2 DPhP - Département de Physique des Particules (ex SPP)
3 LAM - Laboratoire d'Astrophysique de Marseille
4 IAP - Institut d'Astrophysique de Paris

In this study, we probe the transition to cosmic homogeneity in the Large Scale Structure (LSS) of the Universe using the CMASS galaxy sample of BOSS spectroscopic survey which covers the largest effective volume to date, 3 h(−)(3) Gpc(3) at 0.43 ≤ z ≤ 0.7. We study the scaled counts-in-spheres, N(2.97 for r>RH, we find RH = (63.3±0.7) h(−)(1) Mpc, in agreement at the percentage level with the predictions of the ΛCDM model RH=62.0 h(−)(1) Mpc. Thanks to the large cosmic depth of the survey, we investigate the redshift evolution of the transition to homogeneity scale and find agreement with the ΛCDM prediction. Finally, we find that Script D(2) is compatible with 3 at scales larger than 300 h(−)(1) Mpc in all redshift bins. These results consolidate the Cosmological Principle and represent a precise consistency test of the ΛCDM model.

Domaines: Astrophysique [astro-ph]

Pierros Ntelis, Jean-Christophe Hamilton, Jean-Marc Le Goff, Etienne Burtin, Pierre Laurent, et al.. Exploring cosmic homogeneity with the BOSS DR12 galaxy sample. JCAP, 2017, 06, pp.019. ⟨10.1088/1475-7516/2017/06/019⟩. ⟨hal-01645206⟩