Neutrinos and the matter-antimatter asymmetry of the Universe
Stéphane Lavignac (Institut de Physique Théorique, Université Paris Saclay)

The observed matter-antimatter asymmetry of the Universe cannot be explained within the Standard Model and requires new physics. Interestingly, the simplest extension of the Standard Model that can generate Majorana masses for neutrinos contains all the ingredients needed to create an excess of matter over antimatter in the early Universe, via a mechanism called leptogenesis. In this talk, I will discuss the connections between neutrino masses, CP violation in the lepton sector and the matter-antimatter asymmetry of the Universe, and discuss different leptogenesis scenarios. In particular, I will present recent work about leptogenesis during a cosmological first order phase transition.