Gontcho, Satya Gontcho A.; Ge, Jian; Le Goff, J.-M.; Eisenstein, Daniel J.; Font-Ribera, Andreu; Delubac, Timothée; Dawson, Kyle S.; Cuesta, Antonio J.; Comparat, Johan; Croft, Rupert A. C.; Chuang, Chia-Hsun; Carithers, William; Brownstein, Joel R.; Burden, Angela; Busca, Nicolás G.; Brewington, Howard; Brinkmann, J.; Bovy, Jo; Bolton, Adam S.; Blomqvist, Michael; Blanton, Michael; Bizyaev, Dmitry; Beutler, Florian; Bhardwaj, Vaishali; Bautista, Julian E.; Bailey, Stephen; Aubourg, É.; 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-Ibañez, M.; 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, J. A.; Sánchez, Ariel G.; Samushia, Lado; Génova-Santos, R.; Scóccola, C. 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
Referencia bibliográfica
Physical Review D, Volume 92, Issue 12, id.123516
Fecha de publicación:
12
2015
Revista
Número de citas
625
Número de citas referidas
542
Descripción
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.
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