The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Cosmological implications of the large-scale two-point correlation function

Ariel G. Sánchez, C. G. Scóccola, A. J. Ross, W. Percival, M. Manera, F. Montesano, X. Mazzalay, A. J. Cuesta, D. J. Eisenstein, E. Kazin, C. K. Mcbride, K. Mehta, A. D. Montero-Dorta, N. Padmanabhan, F. Prada, J. A. Rubiño-Martín, R. Tojeiro, X. Xu, M. Vargas Magaña, E. AubourgN. A. Bahcall, S. Bailey, D. Bizyaev, A. S. Bolton, H. Brewington, J. Brinkmann, J. R. Brownstein, J. Richard Gott, J. C. Hamilton, S. Ho, K. Honscheid, A. Labatie, E. Malanushenko, V. Malanushenko, C. Maraston, D. Muna, R. C. Nichol, D. Oravetz, K. Pan, N. P. Ross, N. A. Roe, B. A. Reid, D. J. Schlegel, A. Shelden, D. P. Schneider, A. Simmons, R. Skibba, S. Snedden, D. Thomas, J. Tinker, D. A. Wake, B. A. Weaver, David H. Weinberg, Martin White, I. Zehavi, G. Zhao

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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 Ωm = 0.285 ± 0.009, 100Ωb = 4.59 ± 0.09, ns = 0.961 ± 0.009, H0 = 69.4 ± 0.8kms-1Mpc-1 and σ8 = 0.80 ± 0.02. The CMB+CMASS combination sets tight constraints on the curvature of the Universe, with Ωk = -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 ns < 1 at the 99.7per cent CL. We derive constraints on the fraction of massive neutrinos of fν < 0.049 (95per cent CL), implying a limit of ∑mν < 0.51eV. We find no signature of a deviation from a cosmological constant from the combination of all data sets, with a constraint of wDE = -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 wDE(a) = w0 + wa(1 - a). The achieved accuracy on our cosmological constraints is a clear demonstration of the constraining power of current cosmological observations.

Original languageEnglish (US)
Pages (from-to)415-437
Number of pages23
JournalMonthly Notices of the Royal Astronomical Society
Volume425
Issue number1
DOIs
StatePublished - Sep 1 2012

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Sánchez, A. G., Scóccola, C. G., Ross, A. J., Percival, W., Manera, M., Montesano, F., Mazzalay, X., Cuesta, A. J., Eisenstein, D. J., Kazin, E., Mcbride, C. K., Mehta, K., Montero-Dorta, A. D., Padmanabhan, N., Prada, F., Rubiño-Martín, J. A., Tojeiro, R., Xu, X., Magaña, M. V., ... Zhao, G. (2012). The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Cosmological implications of the large-scale two-point correlation function. Monthly Notices of the Royal Astronomical Society, 425(1), 415-437. https://doi.org/10.1111/j.1365-2966.2012.21502.x