The 4-meter Kitt Peak telescope, fitted with the Dark Energy Spectroscopic Instrument (DESI) - a robotic fiber positioner similar to the 2df instrument employed on the AAT- has so far logged 6 million galaxies to construct the largest 3D map of the universe yet compiled.
DESI began mapping galaxies and quasars in 2019 and in the new work, the 900-person collaboration describes results from its first year of data collection. Taken on their own, DESI’s results show that the universe grew according to lambda-CDM (Cold Dark Matter) to a precision of better than 1%. That is, DESI's observations support the prevailing cosmological model, which suggests that the expansion of the universe is accelerating.
However, there are intriguing hints that the acceleration from dark energy might not be entirely constant across cosmic history, challenging some aspects of the prevailing model.
Article here which in turn includes links to arXiv pre-prints :-
https://www.science.org/content/arti...k-energy-probe