Quote from today’s review of the local H0 measurements: JWST “observations provide the strongest evidence yet that systematic errors in HST Cepheid photometry do not play a significant role in the present Hubble Tension”: https://arxiv.org/abs/2308.10954

Groningen group with a new paper *not* finding evidence of unknown systematics being the source of the Hubble tension. This further strengthens the case for early times (pre-recombination) new physics, like New Early Dark Energy (NEDE): https://arxiv.org/abs/2308.05157

A reminder not to believe we know it all and not to stop exploring the wonders that nature might hide for us.

“NANOGrav meets Hot New Early Dark Energy and the origin of neutrino mass”: We show that in the Hot NEDE model, both the Hubble tension and the NANOGrav observations could be a signature of the origin of neutrino mass: https://arxiv.org/abs/2307.03091

Euclid will help us to determine the source of the Hubble tension. Its measurements of Large Scale Structure formation will help us to test and constrain models and provide valuable insight into New Early Dark Energy (NEDE) as a possible solution to the H0 and S8 tensions.

Artist’s impression of Euclid.

A new paper analyzing New Early Dark Energy (NEDE) using profile likelihood methods in collaboration with Aarhus U. group: Emil Brinch Holm, Thomas Tram, and Steen Hannestad and with Florian Niedermann at Nordita and Juan Cruz at SDU: https://arxiv.org/abs/2302.07934