A possible solution to the Hubble constant crisis

Seminário Virtual | Wednesday, June 23, 2021 | 13:00:00
Valerio Marra
The determination of the Hubble constant H0 - the present-day expansion rate of the universe - is one of the key goals of cosmology, for it impacts all measurements of cosmological properties. Determinations of H0 from Cosmic Microwave Background observations disagree with local determinations from calibrated supernovas Ia: this tension is now approaching the 5 sigma level. After reviewing the present status of cosmology, I will discuss the origin of the H0 crisis and propose a model that could explain observations.