The QCD axion and unification


The QCD axion is one of the most appealing candidates for the dark matter in the Universe. In this article, we discuss the possibility to predict the axion mass in the context of a simple renormalizable grand unified theory where the Peccei-Quinn scale is determined by the unification scale. In this framework, the axion mass is predicted to be in the range ma ≃ (3–13) × 109 eV. We study the axion phenomenology and find that the ABRACADABRA and CASPEr-Electric experiments will be able to fully probe this mass window.

A preprint version of the article is available at ArXiv.


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Pérez, P.F., Murgui, C. & Plascencia, A.D. The QCD axion and unification. J. High Energ. Phys. 2019, 93 (2019).

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  • Beyond Standard Model
  • Cosmology of Theories beyond the SM
  • GUT