1. Cosmological implications of baryon acoustic oscillation measurements
- Author
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Aubourg, É, Bailey, S, Bautista, JE, Beutler, F, Bhardwaj, V, Bizyaev, D, Blanton, M, Blomqvist, M, Bolton, AS, Bovy, J, Brewington, H, Brinkmann, J, Brownstein, JR, Burden, A, Busca, NG, Carithers, W, Chuang, CH, Comparat, J, Croft, RAC, Cuesta, AJ, Dawson, KS, Delubac, T, Eisenstein, DJ, Font-Ribera, A, Ge, J, Le Goff, JM, Gontcho, SGA, Gott, JR, Gunn, JE, Guo, H, Guy, J, Hamilton, JC, Ho, S, Honscheid, K, Howlett, C, Kirkby, D, Kitaura, FS, Kneib, JP, Lee, KG, Long, D, Lupton, RH, Magaña, MV, Malanushenko, V, Malanushenko, E, Manera, M, Maraston, C, Margala, D, McBride, CK, Miralda-Escudé, J, Myers, AD, Nichol, RC, Noterdaeme, P, Nuza, SE, Olmstead, MD, Oravetz, D, Pâris, I, Padmanabhan, N, Palanque-Delabrouille, N, Pan, K, Pellejero-Ibanez, M, Percival, WJ, Petitjean, P, Pieri, MM, Prada, F, Reid, B, Rich, J, Roe, NA, Ross, AJ, Ross, NP, Rossi, G, Rubiño-Martín, JA, Sánchez, AG, Samushia, L, Santos, RTG, Scóccola, CG, Schlegel, DJ, Schneider, DP, Seo, HJ, Sheldon, E, Simmons, A, Skibba, RA, Slosar, A, Strauss, MA, Thomas, D, Tinker, JL, Tojeiro, R, Vazquez, JA, Viel, M, Wake, DA, Weaver, BA, Weinberg, DH, Wood-Vasey, WM, Yèche, C, Zehavi, I, and Zhao, GB
- Subjects
astro-ph.CO ,gr-qc ,hep-ex ,Nuclear & Particles Physics ,Astronomical and Space Sciences ,Atomic ,Molecular ,Nuclear ,Particle and Plasma Physics ,Quantum Physics ,Atomic ,Molecular ,Nuclear ,Particle and Plasma Physics - Abstract
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 ΛCDM 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 ΛCDM values at ≈1σ. While the overall χ2 of model fits is satisfactory, the LyaF BAO measurements are in moderate (2-2.5σ) 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
- Published
- 2015