Very happy to see the CosmoVerse white paper, produced within the CosmoVerse COST Action, out today! The white paper discusses in detail the state-of-the-art regarding a number of observational tensions in cosmology (among all the Hubble tension) and how these may be solved either through new fundamental physics or systematics. Huge congrats are due to my friends and colleagues Eleonora Di Valentino and Jackson Levi Said for leading this massive effort featuring over 400 pages and over 500 authors, which required significant coordination and management skills. I myself was one of the Section Coordinators, for section 4.1.3 on extra relativistic degrees of freedom. You can read our results in the preprint we just posted on arXiv: 2504.01669.
