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Research at St Andrews

The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological implications of the configuration-space clustering wedges

Research output: Contribution to journalArticle

Author(s)

Ariel G. Sánchez, Román Scoccimarro, Martín Crocce, Jan Niklas Grieb, Salvador Salazar-Albornoz, Claudio Dalla Vecchia, Martha Lippich, Florian Beutler, Joel R. Brownstein, Chia-Hsun Chuang, Daniel J. Eisenstein, Francisco-Shu Kitaura, Matthew D. Olmstead, Will J. Percival, Francisco Prada, Sergio Rodríguez-Torres, Ashley J. Ross, Lado Samushia, Hee-Jong Seo, Jeremy Tinker & 4 more Rita Tojeiro, Mariana Vargas-Magaña, Yuting Wang, Gong-Bo Zhao

School/Research organisations

Abstract

We explore the cosmological implications of anisotropic clustering measurements in configuration space of the final galaxy samples from Data Release 12 of the Sloan Digital Sky Survey III Baryon Oscillation Spectroscopic Survey. We implement a new detailed modelling of the effects of non-linearities, bias and redshift-space distortions that can be used to extract unbiased cosmological information from our measurements for scales s ≳ 20 h−1 Mpc. We combined the information from Baryon Oscillation Spectroscopic Survey (BOSS) with the latest cosmic microwave background (CMB) observations and Type Ia supernovae samples and found no significant evidence for a deviation from the Λ cold dark matter (ΛCDM) cosmological model. In particular, these data sets can constrain the dark energy equation-of-state parameter to wDE = −0.996 ± 0.042 when to be assumed time independent, the curvature of the Universe to Ωk = −0.0007 ± 0.0030 and the sum of the neutrino masses to ∑mν < 0.25 eV at 95 per cent confidence levels. We explore the constraints on the growth rate of cosmic structures assuming f(z) = Ωm(z)γ and obtain γ = 0.609 ± 0.079, in good agreement with the predictions of general relativity of γ = 0.55. We compress the information of our clustering measurements into constraints on the parameter combinations DV(z)/rd, FAP(z) and fσ8(z) at zeff = 0.38, 0.51 and 0.61 with their respective covariance matrices and find good agreement with the predictions for these parameters obtained from the best-fitting ΛCDM model to the CMB data from the Planck satellite. This paper is part of a set that analyses the final galaxy clustering data set from BOSS. The measurements and likelihoods presented here are combined with others by Alam et al. to produce the final cosmological constraints from BOSS.
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Original languageEnglish
Pages (from-to)1640-1658
JournalMonthly Notices of the Royal Astronomical Society
Volume464
Issue number2
Early online date28 Sep 2016
DOIs
Publication statusPublished - Jan 2017

    Research areas

  • Cosmological parameters, Large-scale structure of universe

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