News on Cold Baryogenesis: Baryon number violation from Higgs bubble collisions at T=0

Abstract: The matter-antimatter asymmetry of our Universe is one of the main open questions in particle physics and cosmology. We will present a novel realization of cold baryogenesis, a mechanism involving the formation and decay of Standard Model SU(2)-textures, that relies on the out-of-equilibrium dynamics during a strong first order electroweak phase transition. Specifically, we compute baryon number violation at zero temperature from Higgs bubble collisions and find that it can be of the same order as that from thermal sphalerons in the symmetric phase at electroweak temperatures. We study the dependence of the rate of Chern-Simons number transitions on the shape of the scalar potential and on the Lorentz factor of the bubble walls at collision via large-scale (3+1)D lattice simulations of the Higgs doublet and SU(2) gauge fields. We estimate the resulting baryon asymmetry assuming some CP-violating source activated by the Higgs-field variation during the phase transition.

To join the seminar online, you can connect to the following link: https://meet.google.com/pui-onfk-rcb