Dark energy from a wide range of cosmological probes

We are entering an exciting era in cosmology, with tantalizing hints of dynamical dark energy. While current data are not sufficient to fully characterize its nature, they may already offer clues about its microphysical properties. Assuming that the latest observations (DESI BAO + SNe Ia + CMB) are correct and that dark energy arises from a scalar field, I will show that there is strong evidence for either a non-minimal coupling to gravity or a non-standard kinetic term, along with a preference for a negative squared mass.
These results so far rely only on cosmological background evolution and linear perturbations. With forthcoming data from Euclid and Rubin, we will soon access the non-linear regime with unprecedented precision. To fully exploit this opportunity, I am developing COSMOTHEKA, a large public repository that consistently re-analyzes virtually all projected large-scale-structure data sets within a common framework. I will highlight new results enabled by this approach, including percent-level constraints on the clumpiness parameter S8, reconstructions of the cosmic growth history, and constraints on baryonic effects from all current weak lensing surveys. I will argue that multi-tracer analyses will be essential for Euclid and Rubin to robustly constrain cosmological parameters and unveil the true nature of dark energy.

Zoom: https://dipc-org.zoom.us/j/99716218431
YouTube: https://youtube.com/live/8BpAmeguKhA