Cosmological implications of baryon acoustic oscillation measurements

	Cosmological implications of baryon acoustic oscillation measurements
	Aubourg, Eric 1; Bailey, Stephen 2; Bautista, Julian E.1; Beutler, Florian 2; Bhardwaj, Vaishali 2,3; Bizyaev, Dmitry 4; Blanton, Michael 5; Blomqvist, Michael 6; Bolton, Adam S.7; Bovy, Jo 8
刊名	PHYSICAL REVIEW D
	2015-12-14
卷号	92 期号:12
英文摘要	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) < 0.56 eV (95% confidence), improving to Sigma m(nu) < 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.
收录类别	SCI
语种	英语
WOS记录号	WOS:000366502800004
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5503]
专题	国家天文台_星系宇宙学研究部
作者单位	1.Univ Paris Diderot, CNRS, CEA,Sorbonne Paris Cite, Astroparticule & Cosmol,APC,IN2P3,Irfu,Observ Par, F-75205 Paris 13, France 2.Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA 3.Univ Washington, Dept Astron, Seattle, WA 98195 USA 4.Natl Solar Observ, Sunspot, NM 88349 USA 5.NYU, Ctr Cosmol & Particle Phys, New York, NY 10003 USA 6.UC Irvine, Dept Phys & Astron, Irvine, CA 92697 USA 7.Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA 8.Inst Adv Study, Princeton, NJ 08540 USA 9.Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth PO1 3FX, Hants, England 10.Observ Nacl, BR-20921400 Rio De Janeiro, RJ, Brazil
推荐引用方式 GB/T 7714	Aubourg, Eric,Bailey, Stephen,Bautista, Julian E.,et al. Cosmological implications of baryon acoustic oscillation measurements[J]. PHYSICAL REVIEW D,2015,92(12).
APA	Aubourg, Eric.,Bailey, Stephen.,Bautista, Julian E..,Beutler, Florian.,Bhardwaj, Vaishali.,...&BOSS Collaboration.(2015).Cosmological implications of baryon acoustic oscillation measurements.PHYSICAL REVIEW D,92(12).
MLA	Aubourg, Eric,et al."Cosmological implications of baryon acoustic oscillation measurements".PHYSICAL REVIEW D 92.12(2015).