Cosmological implications of baryon acoustic oscillation measurements

Eric Aubourg 1 Stephen Bailey Julian E. Bautista Florian Beutler Vaishali Bhardwaj Dmitry Bizyaev Michael Blanton Michael Blomqvist Adam S. Bolton Jo Bovy Howard Brewington J. Brinkmann Joel R. Brownstein Angela Burden Nicols G. Busca William Carithers Chia-Hsun Chuang Johan Comparat 2 Rupert A. C. Croft Antonio J. Cuesta Kyle S. Dawson Timothee Delubac 3 Daniel J. Eisenstein Andreu Font-Ribera Jian Ge J. -M. Le Goff Satya Gontcho A. Gontcho J. Richard Gott James E. Gunn Hong Guo 4 Julien Guy 5 Jean-Christophe Hamilton 6 Shirley Ho 7 Klaus Honscheid Cullan Howlett David Kirkby 8 Francisco S. Kitaura Jean-Paul Kneib 9 Khee-Gan Lee Dan Long Robert H. Lupton Mariana Vargas Magana Viktor Malanushenko Elena Malanushenko Marc Manera Claudia Maraston Daniel Margala 8 Cameron K. Mcbride Jordi Miralda-Escude Adam D. Myers Robert C. Nichol Pasquier Noterdaeme 10 Sebastian E. Nuza Matthew D. Olmstead Daniel Oravetz Isabelle Pâris 11 Nikhil Padmanabhan Nathalie Palanque-Delabrouille 12 Kaike Pan Marcos Pellejero-Ibanez Will J. Percival Patrick Petitjean 10 Matthew M. Pieri Francisco Prada Beth Reid James Rich 13 Natalie A. Roe Ashley J. Ross Nicholas P. Ross Graziano Rossi 12 Jose Alberto Rubino-Martin Ariel G. Sanchez Lado Samushia Ricardo Tanausu Genova Santos Claudia G. Scoccola David J. Schlegel 14 Donald P. Schneider Hee-Jong Seo Erin Sheldon Audrey Simmons Ramin A. Skibba Anze Slosar Michael A. Strauss Daniel Thomas Jeremy L. Tinker Rita Tojeiro Jose Alberto Vazquez Matteo Viel 15 David A. Wake Benjamin A. Weaver David H. Weinberg W. M. Wood-Vasey Christophe Yeche 12 Idit Zehavi Gong-Bo Zhao 16 Boss Collaboration
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-alpha 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 H-0 = 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 Lambda CDM cosmology is an important corroboration of this minimal cosmological model. For constant dark energy (Lambda), our BAO + SN + CMB combination yields matter density Omega(m) = 0.301 +/- 0.008 and curvature Omega(k) = -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 Lambda CDM values at approximate to 1 sigma. While the overall chi(2) of model fits is satisfactory, the LyaF BAO measurements are in moderate (2-2.5 sigma) 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 H-0 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, Sigma m(nu) \textless 0.56 eV (95% confidence), improving to Sigma m(nu) \textless 0.25 eV if we include the lensing signal in the Planck CMB power spectrum. In a flat Lambda CDM model that allows extra relativistic species, our data combination yields N-eff = 3.43 +/- 0.26; while the LyaF BAO data prefer higher N-eff when excluding galaxy BAO, the galaxy BAO alone favor N-eff approximate to 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.
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Physical Review D, 2015, 92 (12), 〈10.1103/PhysRevD.92.123516〉
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Soumis le : mercredi 18 janvier 2017 - 17:34:48
Dernière modification le : jeudi 21 mars 2019 - 13:00:29

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Eric Aubourg, Stephen Bailey, Julian E. Bautista, Florian Beutler, Vaishali Bhardwaj, et al.. Cosmological implications of baryon acoustic oscillation measurements. Physical Review D, 2015, 92 (12), 〈10.1103/PhysRevD.92.123516〉. 〈hal-01439829〉

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