## Abstract

_{m}= 0.285 ± 0.009, 100 Ω

_{b}= 4.59 ± 0.09, n

_{s}= 0.961 ± 0.009, H

_{0}= 69.4 ± 0.8 km s

^{−}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 95 per 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 99.7 per cent CL. We derive constraints on the fraction of massive neutrinos of f

_{ν}< 0.049 (95 per cent CL), implying a limit of ∑m

_{ν}< 0.51 eV. 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 |
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Pages (from-to) | 415-437 |

Journal | Monthly Notices of the Royal Astronomical Society |

Volume | 425 |

Issue number | 1 |

Early online date | 1 Sept 2012 |

DOIs | |

Publication status | Published - 1 Sept 2012 |

## Keywords

- cosmological parameters
- large-scale structure of Universe