DESI shakes up the dark Universe

The Dark Energy Spectroscopic Instrument (DESI) is building the largest 3D map of our universe to measure its expansion history over the past 11 billion years, and thereby, study the biggest mystery in cosmology: dark energy. The DESI first-year BAO results find tantalizing hints of time-varying dark energy. Combining BAO and clustering at all scales, DESI also sheds light on other outstanding questions in cosmology relative to neutrino masses or modified gravity. In this colloquium, I will give an overview of the DESI experiment, describe the year-1 cosmology results and their implication, and present the most recent updates using BAO information from the year-3 DESI data.

Speaker: Nathalie Palanque-Delabrouille, Lawrence Berkeley National Lab