The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: Angular clustering tomography and its cosmological implications

Salvador Salazar-Albornoz, Ariel G. Sánchez, Jan Niklas Grieb, Martin Crocce, Roman Scoccimarro, Shadab Alam, Florian Beutler, Joel R. Brownstein, Chia Hsun Chuang, Francisco Shu Kitaura, Matthew D. Olmstead, Will J. Percival, Francisco Prada, Sergio Rodríguez-Torres, Lado Samushia, Jeremy Tinker, Daniel Thomas, Rita Tojeiro, Yuting Wang, Gong Bo Zhao

    Research output: Contribution to journalArticleResearchpeer-review

    26 Citations (Scopus)

    Abstract

    © 2017 The Authors. We investigate the cosmological implications of studying galaxy clustering using a tomographic approach applied to the final Baryon Oscillation Spectroscopic Survey (BOSS) DR12 galaxy sample, including both auto- and cross-correlation functions between redshift shells. We model the signal of the full shape of the angular correlation function, ω(θ), in redshift bins using state-of-the-art modelling of non-linearities, bias and redshift-space distortions.We present results on the redshift evolution of the linear bias of BOSS galaxies, which cannot be obtained with traditional methods for galaxy-clustering analysis. We also obtain constraints on cosmological parameters, combining this tomographic analysis with measurements of the cosmic microwave background (CMB) and Type Ia supernova (SNIa).We explore a number of cosmological models, including the standard Γ cold darkmattermodel and its most interesting extensions, such as deviations from wDE=-1, non-minimal neutrino masses, spatial curvature and deviations from general relativity (GR) using the growth-index γ parametrization. These results are, in general, comparable to the most precise present-day constraints on cosmological parameters, and show very good agreement with the standard model. In particular, combining CMB, ω(θ) and SNIa, we find a value of wDE consistent with -1 to a precision better than 5 per cent when it is assumed to be constant in time, and better than 6 per cent when we also allow for a spatially curved Universe.
    Original languageEnglish
    Pages (from-to)2938-2956
    JournalMonthly Notices of the Royal Astronomical Society
    Volume468
    Issue number3
    DOIs
    Publication statusPublished - 1 Jan 2017

    Keywords

    • Cosmological parameters
    • Large-scale structure of Universe

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