After more than two decades of precision measurements, we’ve now reached the “gold standard” for how the pieces don’t fit.
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– Matty
- Starts With A Bang — December 14, 2021
- Ethan Siegel
- Original article
- There are two fundamentally different ways of measuring the expanding Universe: a “distance ladder” and an “early relic” method.
- The early relic method prefers an expansion rate of ~67 km/s/Mpc, while the distance ladder prefers a value of ~73 km/s/Mpc — a discrepancy of 9%.
- Owing to Herculean efforts by the distance ladder teams, their uncertainties are now so low that there is a 5-sigma discrepancy between the values. If the discrepancy isn’t due to an error, there may be a new discovery.