#supernovarefsdal — Public Fediverse posts

Constraints on the #HubbleConstant from #SupernovaRefsdal's reappearance: https://arxiv.org/abs/2305.06367 - the result of 67(+/-4) km/s/Mpc is in hard conflict with numerous other methods that cluster around 74(+/- a few) but funnily in accordance with determinations from the CMBR. So the famous tension re. this most fundamental #cosmological number, which is turning 10 years old this year, is getting more intriguing than ever ...

The Magnificent Five Images of #SupernovaRefsdal - Time Delay and Magnification Measurements: https://iopscience.iop.org/article/10.3847/1538-4357/ac4ccb -> "We apply four separate techniques to perform a blind measurement of the relative time delays and magnification ratios between the last image SX and the earlier images S1–S4. [...] This corresponds to a 1.5% precision on the time delay and 17% precision for the magnification ratios and includes uncertainties due to millilensing and microlensing."