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

By G. Addison, D. Watts, C. Bennett, Mark Halpern, Gary F. Hinshaw, J. Weiland. 2017

248 citations recorded by the source corpus.

We examine the impact of baryon acoustic oscillation (BAO) scale measurements on the discrepancy between the value of the Hubble constant (H0) inferred from the local distance ladder and that from Planck cosmic microwave background (CMB) data. While the BAO data alone cannot constrain H0, we show that combining the latest BAO results with WMAP, Atacama Cosmology Telescope (ACT), or South Pole Telescope (SPT) CMB data produces values of H0 that are 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 H0 preferred by the Planck high-multipole temperature power spectrum. Combining galaxy and Lyα forest BAO with a precise estimate of the primordial deuterium abundance produces km s−1 Mpc−1 for the flat model. This value is completely independent of CMB anisotropy constraints and is lower than the latest distance ladder constraint, although tension also exists between the galaxy BAO and Lyα BAO. These results show that it is not possible to explain the H0 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.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/5f2620abbfd0b7d2d17ba288baa9768a2c9b61a5

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Citations in the corpus

Measurements of the Temperature and E-mode Polarization of the CMB from 500 Square Degrees of SPTpol Data (2017, methodology): “Constraints using baryon acoustic oscillation measurements and estimates of the primordial deuterium abundance, which use no CMB measurements, are also 3σ discrepant with low-z H0 estimates (Addison et al. 2017).”
The Ups and Downs of Early Dark Energy solutions to the Hubble tension: A review of models, hints and constraints circa 2023 (2023, methodology): “In addition to this, the assumption of ΛCDM in the early universe 6 allows us to infer a value of rs(zd) from observations of the CMB, calibrating measurements of the BAO which also extend to z ' 2 [50], and provide an independent measurements of the angular diameter distance (and therefore also of ”
Hubble Tension: The Evidence of New Physics (2023, background): “Since reanalyses of the Planck and local ladder measurements could not find a satisfactory answer to the H0 tension, hope was pinned on other observations, such as quasar lensing [37,143], Megamaser [144–148], gravitational waves (GW) [149–151], fast radio bursts (FRBs) [152–156], tip of the red gia”
A buyer’s guide to the Hubble constant (2021, methodology): “Addison et al. (2018) use data (almost) independent of CMB in ΛCDM.”
The Hubble Constant from Infrared Surface Brightness Fluctuation Distances (2021, background): “Measurements of baryon acoustic oscillations (BAO) in redshift surveys, which probe the scale of the primordial density fluctuations at later times, in combination with either other CMB data or constraints from big bang nucleosynthesis, imply H0≈ 67± 1 (Addison et al. 2018; Philcox et al. 2020).”