Theory Seminar: Color breaking baryogenesis
Speaker: Graham White, TRIUMF
Location: Theory Room
Time: 13:00
We propose a scenario that generates the observed baryon asymmetry of the Universe through a multi-step phase transition in which SU(3) color symmetry is first broken and then restored. Two mechanisms produce a baryon asymmetry: one is analogous to conventional electroweak baryogenesis; the second involves spontaneous violation of B−L conservation near the phase boundary. The contribution from the electroweak mechanism dominates, while the spontaneous violation of B−L conservation leaves a small relic charge asymmetry that is several orders of magnitude below current observational bounds. We illustrate this scenario with a simple model that reproduces the observed baryon asymmetry. We discuss how future electric dipole moment and collider searches may probe this scenario, though future EDM searches would require an improved sensitivity of several orders of magnitude.