The Dark Energy Spectroscopic Instrument (DESI) is measuring spectra of millions of distant galaxies and quasars over a five-year period that started in spring 2021. A 3D map of the universe is built from the observations and statistical methods applied to this map allow to place strong constraints on the underlying cosmological model. The main probe used in the data analysis is the baryonic acoustic oscillation that induces a characteristic separation between galaxies. This distance is measured across cosmic times and provides a measurement of the history of the expansion of the universe. I will present the results based on the first three years of observations and their impact on cosmology and in particular on the nature of dark energy and on the sum of neutrino masses.
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Zoom connection: https://cern.zoom.us/j/68399739111?pwd=SGErcHBQYmVLWFZTVE9jdm5xSmdEdz09
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