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Axiogenesis with a Heavy QCD Axion

We demonstrate that the observed cosmological excess of matter over anti-matter may originate from a heavy QCD axion that solves the strong CP problem but has a mass much larger than that given by the Standard Model QCD strong dynamics. We investigate a rotation of the heavy QCD axion in field space...

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Detalles Bibliográficos
Autores principales: Co, Raymond T., Gherghetta, Tony, Harigaya, Keisuke
Lenguaje:eng
Publicado: 2022
Materias:
Acceso en línea:https://dx.doi.org/10.1007/JHEP10(2022)121
http://cds.cern.ch/record/2811400
Descripción
Sumario:We demonstrate that the observed cosmological excess of matter over anti-matter may originate from a heavy QCD axion that solves the strong CP problem but has a mass much larger than that given by the Standard Model QCD strong dynamics. We investigate a rotation of the heavy QCD axion in field space, which is transferred into a baryon asymmetry through weak and strong sphaleron processes. This provides a strong cosmological motivation for heavy QCD axions, which are of high experimental interest. The viable parameter space has an axion mass m$_{a}$ between 1 MeV and 10 GeV and a decay constant f$_{a}$< 10$^{5}$ GeV, which can be probed by accelerator-based direct axion searches and observations of the cosmic microwave background.