Overview
- The peer-reviewed Astronomy & Astrophysics study finds H0 = 71.6 (+3.9/−3.3) km/s/Mpc via time-delay cosmography, consistent with late-universe values yet offset from CMB-inferred ~67.
- Eight strong gravitational lenses were modeled using long-term photometric delays and stellar-kinematic spectroscopy from JWST, Keck, VLT, and Hubble to tackle dominant systematics.
- Uncertainty in the lens galaxies’ mass distribution remains the leading limitation, keeping the current precision near 4.5%.
- The collaboration plans to enlarge the lens sample and refine mass models to approach 1–2% precision that could clarify whether the mismatch signals new physics.
- A separate Yonsei University study claims an age-related bias in Type Ia supernova brightness that could affect distance-ladder results, with LSST and Euclid expected to provide crucial tests.