Probing the nature of dark energy with DESI
Pauline Zarrouk (CR CNRS, LPNHE, Paris)
| When |
Sep 15, 2025
from 11:00 to 12:00 |
|---|---|
| Where | Salle Condorcet |
| Contact Name | Etera Livine |
| Attendees |
Pauline Zarrouk |
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DESI is the first new generation galaxy survey to take data with the goal to shed light on the mechanism that drives the acceleration of the cosmic expansion. We postulate the existence of a mysterious component, dark energy, responsible for such acceleration, and we assume, in our current cosmological model, that dark energy takes the form of a cosmological constant.
Last March, the DESI collaboration published a new batch of papers with the DESI Data Release 2 (DR2) that uses 14 million galaxy and quasar redshifts. By exploiting a special feature, the Baryon Acoustic Oscillations (BAO), in the clustering of galaxies, we can retrace the expansion history of the Universe, test the robustness of our current cosmological model and and constrain the nature of dark energy.
Last March, the DESI collaboration published a new batch of papers with the DESI Data Release 2 (DR2) that uses 14 million galaxy and quasar redshifts. By exploiting a special feature, the Baryon Acoustic Oscillations (BAO), in the clustering of galaxies, we can retrace the expansion history of the Universe, test the robustness of our current cosmological model and and constrain the nature of dark energy.
In this talk, I will introduce the DESI experiment and the DR2 dataset, then I will present the methodology of the BAO analysis and eventually I will discuss the results of DESI alone and in combination with external datasets and their implications for dark energy.