Orateur
Prof.
Graziano Rossi
(Sejong University)
Description
Since the breakthrough discovery that neutrinos are massive (2015 Nobel Prize in Physics and 2016 Breakthrough Prize in Fundamental Physics), pinpointing their total mass has become one of the greatest challenges in science today, at the cross-road between particle physics, astrophysics, and cosmology. After an introduction on the impact of massive neutrinos in structure formation, with a particular focus on the Lyman-α forest, I will present a novel method based on a combination of analytic techniques and state-of-the-art hydrodynamical simulations, which allows one to obtain competitive constraints on the number of effective neutrino species and the sum of neutrino masses from cosmology - in synergy with available data from the SDSS and additional CMB probes. Our results provide strong evidence for the cosmic neutrino background, and rule out the possibility of a sterile neutrino thermalized with active neutrinos at a significance of over 5σ – one of the strongest bounds to date. Finally, I will discuss the complementarity with particle physics experiments, along with possible interdisciplinary efforts.
Auteur principal
Prof.
Graziano Rossi
(Sejong University)
