Orateur
Rodrigo Calderon
Description
The ΛCDM model has been remarkably successful in describing the expansion history and structure of our Universe. Yet, recent high-precision observations are beginning to challenge this simple picture, suggesting possible departures from the cosmological constant, Λ. In this talk, I will discuss what current measurements reveal about the nature of dark energy, focusing on implications for the Horndeski class of scalar-tensor theories and the dynamics of the field driving cosmic acceleration. I will conclude by outlining promising directions for future work, including possible connections to observational systematics and other cosmological tensions.
