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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 730426.0, MPI für Astronomie / Publikationen_mpia
Cosmological implications of baryon acoustic oscillation measurements
Authors:Aubourg, É.; Bailey, S.; Bautista, J. E.; Beutler, F.; Bhardwaj, V.; Bizyaev, D.; Blanton, M.; Blomqvist, M.; Bolton, A. S.; Bovy, J.; Brewington, H.; Brinkmann, J.; Brownstein, J. R.; Burden, A.; Busca, N. G.; Carithers, W.; Chuang, C.-H.; Comparat, J.; Croft, R. A. C.; Cuesta, A. J.; Dawson, K. S.; Delubac, T.; Eisenstein, D. J.; Font-Ribera, A.; Ge, J.; Le Goff, J. -. M.; Gontcho, S. G. A.; Gott, J. R.; Gunn, J. E.; Guo, H.; Guy, J.; Hamilton, J.-C.; Ho, S.; Honscheid, K.; Howlett, C.; Kirkby, D.; Kitaura, F. S.; Kneib, J.-P.; Lee, K.-G.; Long, D.; Lupton, R. H.; Magaña, M. V.; Malanushenko, V.; Malanushenko, E.; Manera, M.; Maraston, C.; Margala, D.; McBride, C. K.; Miralda-Escudé, J.; Myers, A. D.; Nichol, R. C.; Noterdaeme, P.; Nuza, S. E.; Olmstead, M. D.; Oravetz, D.; Pâris, I.; Padmanabhan, N.; Palanque-Delabrouille, N.; Pan, K.; Pellejero-Ibanez, M.; Percival, W. J.; Petitjean, P.; Pieri, M. M.; Prada, F.; Reid, B.; Rich, J.; Roe, N. A.; Ross, A. J.; Ross, N. P.; Rossi, G.; Rubiño-Martín, J. A.; Sánchez, A. G.; Samushia, L.; Santos, R. T. G.; Scóccola, C. G.; Schlegel, D. J.; Schneider, D. P.; Seo, H.-J.; Sheldon, E.; Simmons, A.; Skibba, R. A.; Slosar, A.; Strauss, M. A.; Thomas, D.; Tinker, J. L.; Tojeiro, R.; Vazquez, J. A.; Viel, M.; Wake, D. A.; Weaver, B. A.; Weinberg, D. H.; Wood-Vasey, W. M.; Yèche, C.; Zehavi, I.; Zhao, G.-B.; Collaboration, B.
Date of Publication (YYYY-MM-DD):2015
Title of Journal:Physical Review D
Issue / Number:12
Start Page:id. 123516
Audience:Not Specified
Abstract / Description:We derive constraints on cosmological parameters and tests of dark energy models from the combination of baryon acoustic oscillation (BAO) measurements with cosmic microwave background (CMB) data and a recent reanalysis of Type Ia supernova (SN) data. In particular, we take advantage of high-precision BAO measurements from galaxy clustering and the Lyman-α forest (LyaF) in the SDSS-III Baryon Oscillation Spectroscopic Survey (BOSS). Treating the BAO scale as an uncalibrated standard ruler, BAO data alone yield a high confidence detection of dark energy; in combination with the CMB angular acoustic scale they further imply a nearly flat universe. Adding the CMB-calibrated physical scale of the sound horizon, the combination of BAO and SN data into an "inverse distance ladder" yields a measurement of H0=67.3 ±1.1 km s-1 Mpc-1 , with 1.7% precision. This measurement assumes standard prerecombination physics but is insensitive to assumptions about dark energy or space curvature, so agreement with CMB-based estimates that assume a flat Λ CDM cosmology is an important corroboration of this minimal cosmological model. For constant dark energy (Λ ), our BAO +SN +CMB combination yields matter density Ωm=0.301 ±0.008 and curvature Ωk=-0.003 ±0.003 . When we allow more general forms of evolving dark energy, the BAO +SN +CMB parameter constraints are always consistent with flat Λ CDM values at ≈1 σ . While the overall χ2 of model fits is satisfactory, the LyaF BAO measurements are in moderate (2 - 2.5 σ ) tension with model predictions. Models with early dark energy that tracks the dominant energy component at high redshift remain consistent with our expansion history constraints, and they yield a higher H0 and lower matter clustering amplitude, improving agreement with some low redshift observations. Expansion history alone yields an upper limit on the summed mass of neutrino species, ∑mν<0.56 eV (95% confidence), improving to ∑mν<0.25 eV if we include the lensing signal in the Planck CMB power spectrum. In a flat Λ CDM model that allows extra relativistic species, our data combination yields Neff=3.43 ±0.26 ; while the LyaF BAO data prefer higher Neff when excluding galaxy BAO, the galaxy BAO alone favor Neff≈3 . When structure growth is extrapolated forward from the CMB to low redshift, standard dark energy models constrained by our data predict a level of matter clustering that is high compared to most, but not all, observational estimates.
Free Keywords:Cosmology; Dark energy
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0556-2821 %R 10.1103/PhysRevD.92.123516
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