Axion model with the $\mathrm{SU}(6)$ unification

Abstract

We propose an $\mathrm{SU}(6)$ unified theory that solves the strong $CP$ problem with a high-quality axion. This is achieved by an automatic global Peccei-Quinn $\mathrm{U}(1{)}_{\mathrm{PQ}}$ symmetry and the gauged discrete ${\mathbb{Z}}_{4\mathcal{R}}$ symmetry. With the axion mass predictions of $m_a\sim \mathcal{O}(10^{-3})-\mathcal{O}(0.1)\mathrm{eV}$, as well as a universal axion-photon coupling in the unification models, the QCD axion can be probed in the upcoming experiments of IAXO. An intermediate gauge symmetry breaking scale characterized by the axion decay constant is obtained by the Peccei-Quinn quality argument, which is likely to achieve a successful leptogenesis through the type-I seesaw mechanism. The Higgs sector at the electroweak scale is a type-II two-Higgs-doublet model. The gauge coupling unification is possible with the supersymmetric extension.

9 pages, 3 figures, 3 tables, matches the published version

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• From axion quality and naturalness problems to a high-quality ${\mathbb{Z}}_N$ QCD relaxion
• Axion Quality Problem Alleviated by Non-Minimal Coupling to Gravity
• High Quality Axion in Supersymmetric Models
• High-quality grand unified theories with three generations
• Bottom quark and tau lepton masses in a toy $\mathrm{SU}(6)$
• A two-generational $\mathrm{SU}(7)$ model with extended weak sector: mass hierarchies, mixings, and the flavor non-universality
• Flipped SU(6) Unification of the $SU(3{)}_c\times SU(3{)}_L\times U(1{)}_X$ Model
• Five dimensional $SU(5)\times U(1{)}_{\mathrm{PQ}}$ grand unification
• The non-topological $Z^{\prime }$ string in the 331 model and its classical stability