Seminario

Il giorno 7 aprile alle ore 14,00 presso la stanza 412, Pietro Ghedini terra' un seminario dal titolo 

Beyond the Cosmological Constant: The Dark Energy Quest

Abstract

Understanding the nature of dark energy remains one of the central challenges in modern cosmology. In this seminar, I will present recent advances in probing extensions to the standard ΛCDM model using both observational and theoretical approaches. First, I discuss interacting dark energy models in which dark matter and dark energy interact non-gravitationally. In particular, I will highlight the importance of redshift space distortion measurements in narrowing the allowed parameter space, providing tight constraints on the interacting dark energy model considered. I then present a model-independent study of the cosmic evolution of dark energy using a non-parametric reconstruction method. Given the degeneracies between dark energy and neutrinos, we use the same formalism to reconstruct also the sum of neutrino masses. Our analysis indicates that deviations from a cosmological constant are generally small, though certain data combinations allow for phantom‑like dark energy evolution with implications for neutrino mass bounds. Together, these studies highlight the power (and importance) of combining different measurements to break degeneracies when trying to constrain a cosmological model.

Zoom link: https://cern.zoom.us/j/63414047463?pwd=OAuE7B2AAjxU3ZPNr43sxuxdku3xQU.1