Hubble constant difference between CMB lensing and BAO measurements
We apply a tension metric QUDM, the update difference in mean parameters, to understand the source of the difference in the measured Hubble constant H0 inferred with cosmic microwave background lensing measurements from the Planck satellite (H0 = $67.9$ $$^{+1.1}_{–1.3}$$ km/s/Mpc) and from the South Pole Telescope (H0 = $72.0$ $$^{+2.1}_{–2.5}$$ km/s/Mpc) when both are combined with baryon acoustic oscillation (BAO) measurements with priors on the baryon density (BBN). QUDM isolates the relevant parameter directions for tension or concordance where the two data sets are both informative, and aids in the identification of subsets of data that source the observed tension. With QUDM, we uncover that the difference in H0 is driven by the tension between Planck lensing and BAO+BBN, at probability-to-exceed of 6.6%. Most of this mild tension comes from the galaxy BAO measurements parallel to the line of sight in the redshift range 0.2 < z < 0.75. Here, the redshift dependence of the parallel BAOs pulls both the matter density Ωm and H0 high in Λ CDM, but these parameter anomalies are usually hidden when the BAO measurements are combined with other cosmological data sets with much stronger Ωm constraints.
- Research Organization:
- Univ. of Chicago, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF); National Aeronautics and Space Administration (NASA); NNH17ZDA001N
- Grant/Contract Number:
- SC0009924; PHY-1125897; FG02-13ER41958
- OSTI ID:
- 1734898
- Journal Information:
- Physical Review D, Vol. 102, Issue 2; ISSN 2470-0010
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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