Ryan Camilleri and Tamara Davis tell us about how they have used the Dark Energy Survey’s Year 5 supernovae catalogue, anchored to the Dark Energy Spectroscopic Instrument’s Baryon Acoustic Oscillations, to create an “inverse distance ladder”.
With this they are able to determine the Hubble Parameter, at redshift zero with a high accuracy, without needing to assume ΛCDM. The results still match Planck, meaning that the high redshift to low redshift matching appears to still not work out, even outside of ΛCDM.
The implications are large for any attempts to go beyond ΛCDM to solve the Hubble tension as it appears the z=2 to z=0.05 window is not the right window for finding the solution.
Paper: arXiv: 2406.05049
Cosmology Talks 