Baryogenesis from extended scalar sectors: off the beaten track

Abstract

Extended scalar sectors can yield baryogenesis at the EW scale. This is generally related to their providing the needed departure from thermal equilibrium (absent in the SM) via a first-order EW phase transition. Yet, BSM sources of CP violation are also required for baryogenesis, despite being very strongly constrained experimentally by electric dipole moments (EDMs). In this talk I show that extended scalar sectors may offer a solution to this problem too, by yielding an enhancement of CP violation in the early Universe that is a catalyzer for baryogenesis while being in agreement with EDMs. I will discuss the main ingredients of such new physics scenarios in several different incarnations, as well as their phenomenological consequences. FInally, I will discuss a related avenue to achieve EW baryogenesis that relies on the breaking of hypercharge in the early Universe.

Date
Nov 15, 2023 3:00 PM China Standard Time
Event
Theory Seminar