Elucidating.CDM: Impact of Baryon Acoustic Oscillation Measurements on the Hubble Constant Discrepancy

被引：209

作者：

Addison, G. E. ^{[1
]}

Watts, D. J. ^{[1
]}

Bennett, C. L. ^{[1
]}

Halpern, M. ^{[2
]}

Hinshaw, G. ^{[2
]}

Weiland, J. L. ^{[1
]}

机构：

[1] Johns Hopkins Univ, Dept Phys & Astron, 3400 N Charles St, Baltimore, MD 21218 USA

[2] Univ British Columbia, Dept Phys & Astron, 6224 Agr Rd, Vancouver, BC V6T 1Z1, Canada

来源：

ASTROPHYSICAL JOURNAL | 2018年 / 853卷 / 02期

关键词：

cosmic background radiation; cosmological parameters; cosmology: observations; distance scale large; scale structure of universe; DEUTERIUM ABUNDANCE; POWER-SPECTRUM; CONSTRAINTS; GALAXIES; H-0; KIDS-450; SAMPLE; I;

D O I：

10.3847/1538-4357/aaa1ed

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We examine the impact of baryon acoustic oscillation (BAO) scale measurements on the discrepancy between the value of the Hubble constant (H-0) inferred from the local distance ladder and that from Planck cosmic microwave background (CMB) data. While the BAO data alone cannot constrain H-0, we show that combining the latest BAO results with WMAP, Atacama Cosmology Telescope (ACT), or South Pole Telescope (SPT) CMB data produces values of H-0 that are 2.4-3.1 sigma lower than the distance ladder, independent of Planck, and that this downward pull was less apparent in some earlier analyses that used only angle-averaged BAO scale constraints rather than full anisotropic information. At the same time, the combination of BAO and CMB data also disfavors the lower values of H-0 preferred by the Planck high-multipole temperature power spectrum. Combining galaxy and Ly alpha forest BAO with a precise estimate of the primordial deuterium abundance produces H-0 = 66.98 +/- 1.18 km s(-1). Mpc(-1) for the flat LCDM model. This value is completely independent of CMB anisotropy constraints and is 3.0 sigma lower than the latest distance ladder constraint, although 2.4 sigma tension also exists between the galaxy BAO and Lya BAO. These results show that it is not possible to explain the H-0 disagreement solely with a systematic error specific to the Planck data. The fact that tensions remain even after the removal of any single data set makes this intriguing puzzle all the more challenging to resolve.

引用

页数：12

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