The status of single scalar field dark energy

          @misc{ scivideos_PIRSA:26040125,
            doi = {10.48660/26040125},
            url = {https://pirsa.org/26040125},
            author = {Garcia-Garcia, Carlos},
            keywords = {Cosmology},
            language = {en},
            title = {The status of single scalar field dark energy},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2026},
            month = {apr},
            note = {PIRSA:26040125 see, \url{https://scivideos.org/pirsa/26040125}}
          }
          

Abstract

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 the cosmological data exhibit a strong preference for either a non-minimal coupling to gravity or a non-standard kinetic term, along with a preference for a negative squared mass. However, these scenarios have distinct implications at the level of the ISW, cosmic structure growth and Solar System constraints on deviations from General Relativity. I will present preliminary results assessing whether these two cases remain viable across all these probes.