## Abstract

We obtain constraints on cosmological parameters from the spherically averaged redshift-space correlation function of the CMASS Data Release 9 (DR9) sample of the Baryonic Oscillation Spectroscopic Survey (BOSS). We combine this information with additional data from recent cosmic microwave background (CMB), supernova and baryon acoustic oscillation measurements. Our results show no significant evidence of deviations from the standard flat Λ cold dark matter model, whose basic parameters can be specified by Ω_{m} = 0.285 ± 0.009, 100Ω_{b} = 4.59 ± 0.09, n_{s} = 0.961 ± 0.009, H_{0} = 69.4 ± 0.8kms^{-1}Mpc^{-1} and σ_{8} = 0.80 ± 0.02. The CMB+CMASS combination sets tight constraints on the curvature of the Universe, with Ω_{k} = -0.0043 ± 0.0049, and the tensor-to-scalar amplitude ratio, for which we find r < 0.16 at the 95per cent confidence level (CL). These data show a clear signature of a deviation from scale invariance also in the presence of tensor modes, with n_{s} < 1 at the 99.7per cent CL. We derive constraints on the fraction of massive neutrinos of f_{ν} < 0.049 (95per cent CL), implying a limit of ∑m_{ν} < 0.51eV. We find no signature of a deviation from a cosmological constant from the combination of all data sets, with a constraint of w_{DE} = -1.033 ± 0.073 when this parameter is assumed time-independent, and no evidence of a departure from this value when it is allowed to evolve as w_{DE}(a) = w_{0} + w_{a}(1 - a). The achieved accuracy on our cosmological constraints is a clear demonstration of the constraining power of current cosmological observations.

Original language | English (US) |
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Pages (from-to) | 415-437 |

Number of pages | 23 |

Journal | Monthly Notices of the Royal Astronomical Society |

Volume | 425 |

Issue number | 1 |

DOIs | |

State | Published - Sep 1 2012 |

## All Science Journal Classification (ASJC) codes

- Astronomy and Astrophysics
- Space and Planetary Science

## Keywords

- Cosmological parameters
- Large-scale structure of Universe