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http://hdl.handle.net/20.500.12386/23538
Title: | Cosmological implications of baryon acoustic oscillation measurements | Authors: | Aubourg, Éric Bailey, Stephen Bautista, Julian E. Beutler, Florian Bhardwaj, Vaishali Bizyaev, Dmitry Blanton, Michael Blomqvist, Michael Bolton, Adam S. Bovy, Jo Brewington, Howard Brinkmann, J. Brownstein, Joel R. Burden, Angela Busca, Nicolás G. Carithers, William Chuang, Chia-Hsun Comparat, Johan Croft, Rupert A. C. Cuesta, Antonio J. Dawson, Kyle S. Delubac, Timothée Eisenstein, Daniel J. Font-Ribera, Andreu Ge, Jian Le Goff, J. -M. Gontcho, Satya Gontcho A. Gott, J. Richard Gunn, James E. Guo, Hong Guy, Julien Hamilton, Jean-Christophe Ho, Shirley Honscheid, Klaus Howlett, Cullan Kirkby, David Kitaura, Francisco S. Kneib, Jean-Paul Lee, Khee-Gan Long, Dan Lupton, Robert H. Magaña, Mariana Vargas Malanushenko, Viktor Malanushenko, Elena Manera, Marc Maraston, Claudia Margala, Daniel McBride, Cameron K. Miralda-Escudé, Jordi Myers, Adam D. Nichol, Robert C. Noterdaeme, Pasquier Nuza, Sebastián E. Olmstead, Matthew D. Oravetz, Daniel Pâris, Isabelle Padmanabhan, Nikhil Palanque-Delabrouille, Nathalie Pan, Kaike Pellejero-Ibanez, Marcos Percival, Will J. Petitjean, Patrick Pieri, Matthew M. Prada, Francisco Reid, Beth Rich, James Roe, Natalie A. Ross, Ashley J. Ross, Nicholas P. Rossi, Graziano Rubiño-Martín, Jose Alberto Sánchez, Ariel G. Samushia, Lado Génova-Santos, Ricardo Tanausú Scóccola, Claudia G. Schlegel, David J. Schneider, Donald P. Seo, Hee-Jong Sheldon, Erin Simmons, Audrey Skibba, Ramin A. Slosar, Anže Strauss, Michael A. Thomas, Daniel Tinker, Jeremy L. Tojeiro, Rita Vazquez, Jose Alberto VIEL, MATTEO Wake, David A. Weaver, Benjamin A. Weinberg, David H. Wood-Vasey, W. M. Yèche, Christophe Zehavi, Idit Zhao, Gong-Bo BOSS Collaboration |
Issue Date: | 2015 | Journal: | PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY | Number: | 92 | Issue: | 12 | First Page: | 123516 | 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 H<SUB>0</SUB>=67.3 ±1.1 km s<SUP>-1</SUP> Mpc<SUP>-1</SUP> , 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 Ω<SUB>m</SUB>=0.301 ±0.008 and curvature Ω<SUB>k</SUB>=-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 χ<SUP>2</SUP> 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 H<SUB>0</SUB> 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, ∑m<SUB>ν</SUB><0.56 eV (95% confidence), improving to ∑m<SUB>ν</SUB><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 N<SUB>eff</SUB>=3.43 ±0.26 ; while the LyaF BAO data prefer higher N<SUB>eff</SUB> when excluding galaxy BAO, the galaxy BAO alone favor N<SUB>eff</SUB>≈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. <P /> | URI: | http://hdl.handle.net/20.500.12386/23538 | URL: | http://arxiv.org/abs/1411.1074v3 https://journals.aps.org/prd/abstract/10.1103/PhysRevD.92.123516 |
ISSN: | 1550-7998 | DOI: | 10.1103/PhysRevD.92.123516 | Bibcode ADS: | 2015PhRvD..92l3516A | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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