Speaker
Description
We proposed a mechanism called axiogenesis to explain the observed cosmological excess of matter over antimatter. A rotation of the QCD axion is induced by explicit Peccei-Quinn symmetry breaking in the early universe. The rotation corresponds to the asymmetry of the PQ charge, which is converted into the baryon asymmetry via QCD and electroweak sphaleron transitions. Such a rotation also gives rise to a new origin of axion dark matter, which we call the kinetic misalignment mechanism. The concrete model we explore predicts a small decay constant and has close connections with axion dark matter and new physics at the colliders. These ideas arise from complimentary and well-motivated axion initial conditions, expanding the parameter space to the regions of interest for the extensive experimental searches.
