Orateur
Description
In this talk I will overview the preliminary cosmological results from the DESI Peculiar Velocity survey, using the first year of data. We measured about 100k peculiar velocities using the Tully-Fisher relation and the Fundamental Plane. We use auto and cross-correlations between our peculiar velocities and galaxy positions from the Bright Galaxy Survey at redshifts z < 0.1 to measure the growth rate of structures at 12.5\% precision (preliminary). This measurement was performed with three different methods and consistently tested with the largest and most realistic set of mock catalogs. Thanks to this low-redshift growth rate measurement, we are able to reduce uncertainties on the gravitational index parameter gamma by a factor of nearly 2.
