5 upvotes, 1 direct replies (showing 1)
The Hubble tension is still as tense as ever!
We still don't have an agreement between early-time measurements of the Hubble constant and late-time measurements, and everyone's pretty sure that their measurements are accurate -- so something somewhere needs to give. Some recent research has said that changing physics at late times cannot resolve the tension, and similarly other research claims that changing physics at early times also won't resolve it. So it's got to be some new physics across both early and late times, or some systematic errors that we aren't aware of.
Gravitational waves are potentially the difference maker. We can measure the Hubble constant at late-times with them, and we expect their systematic errors to be independent of all other kinds of measurement. If we can produce an accurate GW measurement of the Hubble constant, then that should hopefully resolve things once and for all, but that could be a few years away yet!
Comment by Gray_Fox at 15/07/2022 at 23:50 UTC
1 upvotes, 0 direct replies
that's awesome!! it makes me miss astronomy, altho i was an exoplanet guy lol. thank you!