2022-12-12

UTAPwiki/セミナー/初期宇宙・相対論速報

Title: Cancellation of the VIA source in Electroweak Baryogenesis †

Speaker: Jorinde van de Vis (Universiteit Utrecht) †

In electroweak baryogenesis, the asymmetry between matter and antimatter is generated during the electroweak phase transition. Predicting the amount of matter requires a derivation of transport equations for the CP-violating particles. For a long time, two different formalisms were used in the literature: the semi-classical method and the vev-insertion approximation. The latter typically yielded a much larger value for the asymmetry, such that certain models for electroweak baryogenesis were only consistent with observations if the vev-insertion approximation was correct. In this talk, I will argue that the CP-violating source derived in the vev-insertion approximation is a mere artefact, and in fact vanishes completely.