Seminar: Evidence for evolving dark energy from the DESI DR2 results, by Juan Mena Fernandez (LPSC)

vendredi 24 oct. 2025, 14:00 → 16:00 Europe/Paris

Auditorium Marcel Vivargent (LAPP)

Francesco Costanza (LAPP), Luis Manzanillas (Manzanillas)

Some of the most profound questions in fundamental physics can be addressed by studying how matter is distributed across the universe, as a function of both scale and time (or redshift). This includes testing the physics of the early universe and probing the nature of dark energy, the mysterious force driving the accelerated expansion of the universe.

The Dark Energy Spectroscopic Instrument (DESI), which began its five-year survey in 2021, is undertaking one of the most ambitious efforts to date to map the large-scale structure of the universe. By constructing the largest and most precise 3D map of galaxies and quasars, DESI enables detailed measurements of the universe's expansion history and the growth of cosmic structure over the past 11 billion years.

This talk presents the latest cosmological results from DESI, focusing on measurements of the expansion history based on the first three years of DESI data. The cosmological implications of these results are highlighted, including new evidence pointing toward dynamical dark energy, a scenario in which dark energy evolves with time rather than remaining constant.

14:00 → 14:20 DESI results

DESI_DR2_results_2025.pdf