The Dark Energy Spectroscopic Instrument (DESI) published its DR2 Baryon Acoustic Oscillation (BAO) measurement in March 2025, based on a spectroscopic sample of over 14 million galaxies and quasars. After an overview of the DESI survey itself, I will present the DR2 BAO measurement and its cosmological implications, with a particular focus on neutrino mass constraints and on the nature of...
We measure for the first time the Hubble constant (H0) from the cross-correlation of galaxies and gravitational waves (GW), by applying the Peak Sirens method. This method consists of finding the peak of the 3D angular cross-spectrum $C_\ell(z,D_L)$ between the galaxy redshifts ($z$) and the GW luminosity distances ($D_L$). Using two GW events from the GWTC-3.0 catalog and the GLADE+ galaxy...
