Seminar 
Title: A new mechanism of baryogenesis: leptogenesis via phase transition 
Speaker: Dr.Ye-Ling Zhou（周也铃）(Durham University, UK) 
Time: 10:00AM, Jan.12 2017(Thursday) 
Place: Theoretical Physics Division，319 

Abstract: The speaker will talk about a new mechanism of baryogenesis (arXiv:1611.04817). It generates a lepton asymmetry via phase transition and partially converts it to abaryon asymmetry through sphaleron processes. It differs from the classical thermal leptogenesis in type-I seesaw, where the lepton asymmetry is generated through the decay of right-handed neutrinos. This mechanism does not specify any neutrino mass origins, but requires just a Weinberg operator and a CP-violating phase transition. It provides strong connections with low-energy neutrino experiments and leptonic flavour models.