Hubble Tension, CHIME Expansion Mapping, and Supernova Systematics

The early- versus late-Universe expansion discrepancy remains statistically decisive at roughly 5 sigma. A reprocessed catalogue of 2,884 Type Ia supernovae yields only a 3.1-3.3-sigma hint of evolving dark energy, while CHIME's validated neutral-hydrogen mapping offers an independent seven-year test amid calibration and population-systematics concerns.