We propose a mechanism called axiogenesis where the cosmological excess of baryons over antibaryons is generated from the rotation of the QCD axion. The Peccei-Quinn (PQ) symmetry may be explicitly broken in the early Universe, inducing the rotation of a PQ charged scalar field. The rotation corresponds to the asymmetry of the PQ charge, which is converted into the baryon asymmetry via QCD and electroweak sphaleron transitions. In the concrete model we explore, interesting phenomenology arises due to the prediction of a small decay constant and the connections with new physics at the LHC and future colliders and with axion dark matter.
Bibliographical noteFunding Information:
We are grateful to Nicolas Fernandez and Akshay Ghalsasi for collaboration in the early stages of this work. We thank Lawrence J. Hall and Aaron Pierce for useful discussions and comments on the manuscript. The work was supported in part by the DoE Early Career Grant No. DE-SC0019225 (R. C.), the DoE Grant No. DE-SC0009988 (K. H.), and the Raymond and Beverly Sackler Foundation Fund (K. H.).
© 2020 authors. Published by the American Physical Society.