Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics beyond ΛCDM

Short summary

A new analysis of 70 long-period Cepheid stars in the Large Magellanic Cloud (LMC) using Hubble Space Telescope data has reduced the uncertainty in the geometric calibration of the Cepheid distance ladder from 2.5% to 1.3%. This improved calibration, combined with other distance anchors, yields a Hubble constant (H0) of 74.03 ± 1.42 km s−1 Mpc−1, a 1.91% uncertainty.

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