DESI DR2: Survey overview and cosmological constraints from DR2 Baryon Acoustic Oscillation measurements

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• Arnaud de Mattia (IRFU, CEA, Université Paris-Saclay)
• Monday 12 May 2025, 13:00-14:00
• SPECIAL LOCATION - CMS, MR5, Pav A basement.

If you have a question about this talk, please contact Louis Legrand.

Zoom link: https://cam-ac-uk.zoom.us/j/86165819179?pwd=uITeMzHyCpzVlUmVufdGEJXudF0dsy.1

The Dark Energy Spectroscopic Instrument (DESI) is undertaking a five-year survey spanning 14,000 square degrees of the sky, with the goal of mapping 40 million extragalactic redshifts. These observations aim to refine our understanding of the universe’s expansion history through Baryon Acoustic Oscillations (BAO) and the growth of cosmic structure via Full Shape analyses. In 2025, the DESI collaboration released BAO cosmology results from the Data Release 2 (DR2) sample, assembled from the first three years of data taking (2021 – 2024). This presentation will introduce the instrument and the survey and review the BAO measurements derived from DR2 . I will discuss the consistency of BAO constraints with other probes—-CMB (including the latest ACT DR6 CMB data) and supernovae—-and present cosmological constraints on dark energy and neutrino masses. I will conclude by providing an outlook on upcoming DESI analyses.

This talk is part of the Cosmology Lunch series.

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