DESI is the first new generation galaxy survey to take data with the goal to shed light on the mechanism that drives the acceleration of the cosmic expansion. We postulate the existence of a mysterious component, dark energy, responsible for such acceleration, and we assume, in our current cosmological model, that dark energy takes the form of a cosmological constant Lambda.
Last March, the DESI collaboration published a new batch of papers with the DESI Data Release 2 (DR2) that contains 14 million galaxy and quasar redshifts. We updated the BAO analysis that allows us to retrace the expansion history of the Universe and constrain the nature of dark energy, but also neutrinos.
In this talk, I will briefly remind the DESI experiment and the DR2 dataset, then I will present the methodology of the BAO analysis and eventually I will discuss the results of DESI alone and in combination with external datasets and their implications for dark energy and neutrinos.