APS tip sheet: Origins of matter and antimatter

Study suggests an ‘axiogenesis’ mechanism for the explanation of the matter to antimatter ratio in the Universe

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Credit: Co et al. Physical Review Letters (2020) and NASA


The fact that the Universe has more matter than antimatter is often referred to as “baryon asymmetry.” The theoretical process behind this imbalance is “baryogenesis” and supposedly took place during the early cosmos. Now, a new paper postulates a mechanism called “axiogenesis,” which suggests that the excess of matter over antimatter comes from a rotation of the axion field. Raymond Co and Keisuke Harigaya used a model to explore the physics behind the rotation of the quantum chromodynamics axion, a hypothetical particle that is also a dark matter candidate. The work could provide “new research avenues for model building and studies of associated phenomenology” according to the authors.

Axiogenesis

Raymond T. Co and Keisuke Harigaya

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