TY - JOUR
T1 - Cosmological implications of baryon acoustic oscillation measurements
AU - (BOSS Collaboration)
AU - Aubourg, Éric
AU - Bailey, Stephen
AU - Bautista, Julian E.
AU - Beutler, Florian
AU - Bhardwaj, Vaishali
AU - Bizyaev, Dmitry
AU - Blanton, Michael
AU - Blomqvist, Michael
AU - Bolton, Adam S.
AU - Bovy, Jo
AU - Brewington, Howard
AU - Brinkmann, J.
AU - Brownstein, Joel R.
AU - Burden, Angela
AU - Busca, Nicolás G.
AU - Carithers, William
AU - Chuang, Chia Hsun
AU - Comparat, Johan
AU - Croft, Rupert A.C.
AU - Cuesta, Antonio J.
AU - Dawson, Kyle S.
AU - Delubac, Timothée
AU - Eisenstein, Daniel J.
AU - Font-Ribera, Andreu
AU - Ge, Jian
AU - Le Goff, J. M.
AU - Gontcho, Satya Gontcho A.
AU - Gott, J. Richard
AU - Gunn, James E.
AU - Guo, Hong
AU - Guy, Julien
AU - Hamilton, Jean Christophe
AU - Ho, Shirley
AU - Honscheid, Klaus
AU - Howlett, Cullan
AU - Kirkby, David
AU - Kitaura, Francisco S.
AU - Kneib, Jean Paul
AU - Lee, Khee Gan
AU - Long, Dan
AU - Lupton, Robert H.
AU - Magaña, Mariana Vargas
AU - Malanushenko, Viktor
AU - Malanushenko, Elena
AU - Manera, Marc
AU - Maraston, Claudia
AU - Margala, Daniel
AU - McBride, Cameron K.
AU - Miralda-Escudé, Jordi
AU - Strauss, Michael A.
PY - 2015/12/14
Y1 - 2015/12/14
N2 - 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<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 ΛCDM 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.
AB - 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<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 ΛCDM 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.
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U2 - 10.1103/PhysRevD.92.123516
DO - 10.1103/PhysRevD.92.123516
M3 - Article
SN - 1550-7998
VL - 92
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 12
M1 - 123516
ER -