Planck 2018 results
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Fig. 17.


Inverse-distance-ladder constraints on the Hubble parameter and Ωm in the base-ΛCDM model, compared to the result from the full Planck CMB power-spectrum data. BAO data constrain the ratio of the sound horizon at the epoch of baryon drag and the distances; the sound horizon depends on the baryon density, which is constrained by the conservative prior of Ωbh2 = 0.0222 ± 0.0005, based on the measurement of D/H by Cooke et al. (2018) and standard BBN with modelling uncertainties. Adding Planck CMB lensing constrains the matter density, or adding a conservative Planck CMB “BAO” measurement (100θMC = 1.0409 ± 0.0006) gives a tight constraint on H0, comparable to that from the full CMB data set. Grey bands show the local distance-ladder measurement of Riess et al. (2019). Contours contain 68% and 95% of the probability. Marginalizing over the neutrino masses or allowing dark energy equation of state parameters w0 >  −1 would only lower the inverse-distance-ladder constraints on H0. The dashed contours show the constraints from the data combination BAO+JLA+D/H BBN.

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