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The power spectrum and bispectrum of SDSS DR11 BOSS galaxies - II. Cosmological interpretation

Gil-Marín, Héctor ; Verde, Licia ; Noreña, Jorge ; Cuesta, Antonio J. ; Samushia, Lado ; Percival, Will J. ; Wagner, Christian ; Manera, Marc ; Schneider, Donald P.

In: Monthly Notices of the Royal Astronomical Society, 2015, vol. 452, no. 2, p. 1914-1921

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    Titre
    • The power spectrum and bispectrum of SDSS DR11 BOSS galaxies - II. Cosmological interpretation
    Auteur
    • Gil-Marín, Héctor. Institute of Cosmology & Gravitation, University of Portsmouth, Dennis Sciama Building, Portsmouth PO1 3FX, UK
    • Verde, Licia. Institut de Ciències del Cosmos, Universitat de Barcelona, IEEC-UB, Martí i Franquès 1, E-08028, Barcelona, Spain
    • Noreña, Jorge. Institut de Ciències del Cosmos, Universitat de Barcelona, IEEC-UB, Martí i Franquès 1, E-08028, Barcelona, Spain
    • Cuesta, Antonio J.. Institut de Ciències del Cosmos, Universitat de Barcelona, IEEC-UB, Martí i Franquès 1, E-08028, Barcelona, Spain
    • Samushia, Lado. Institute of Cosmology & Gravitation, University of Portsmouth, Dennis Sciama Building, Portsmouth PO1 3FX, UK
    • Percival, Will J.. Institute of Cosmology & Gravitation, University of Portsmouth, Dennis Sciama Building, Portsmouth PO1 3FX, UK
    • Wagner, Christian. Max-Planck-Institut für Astrophysik, Karl-Schwarzschild Str. 1, D-85741 Garching, Germany
    • Manera, Marc. University College London, Gower Street, London WC1E 6BT, UK
    • Schneider, Donald P.. Department of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA 16802, USA
    Type de document
    • Postprint
    Langue
    • Inglese
    Publié dans
    • Monthly Notices of the Royal Astronomical Society, 2015, vol. 452, no. 2, p. 1914-1921. Oxford University Press
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:297943
    Summary
    We examine the cosmological implications of the measurements of the linear growth rate of cosmological structure obtained in a companion paper from the power spectrum and bispectrum monopoles of the Sloan Digital Sky Survey III Baryon Oscillation Spectroscopic Survey Data Release 11, CMASS galaxies. This measurement was of f0.43σ8, where σ8 is the amplitude of dark matter density fluctuations, and f is the linear growth rate, at the effective redshift of the survey, zeff=0.57. In conjunction with cosmic microwave background (CMB) data, interesting constraints can be placed on models with non-standard neutrino properties and models where gravity deviates from General Relativity on cosmological scales. In particular, the sum of the masses of the three species of the neutrinos is constrained to mν<0.49 eV (at 95 per cent confidence level) when the f0.43σ8 measurement is combined with state-of-the-art CMB measurements. Allowing the effective number of neutrinos to vary as a free parameter does not significantly change these results. When we combine the measurement of f0.43σ8 with the complementary measurement of fσ8 from the monopole and quadrupole of the two-point correlation function, we are able to obtain an independent measurements of f and σ8. We obtain f=0.63±0.16 and σ8=0.710±0.086 (68 per cent confidence level). This is the first time when these parameters have been able to be measured independently using the redshift-space power spectrum and bispectrum measurements from galaxy clustering data only