Orateur
Julien Lesgourgues
(RWTH Aachen University)
Description
Cosmological upper bounds on the summed neutrino mass are in increasing tension with respect to laboratory lower bounds as long as standard neutrino physics and the LambdaCDM cosmological model are assumed. I will stress that the tension is driven by measurements of the Universe expansion rate (from BAO, CMB and supernovae data), completed by information from CMB lensing. I will show that there is a variety of physical assumptions allowing to reconcile neutrino mass bounds. I will highlight four very different scenarios doing so.