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arXiv · 2412.05362

Non-Invertible Peccei-Quinn Symmetry, Natural 2HDM Alignment, and the Visible Axion

Antonio Delgado·Seth Koren
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Abstract

We identify $m_{12}^2$ as a spurion of non-invertible Peccei-Quinn symmetry in the type II 2HDM with gauged quark flavor. Thus a UV theory which introduces quark color-flavor monopoles can naturally realize alignment without decoupling and can furthermore revive the Weinberg-Wilczek axion. As an example we consider the $SU(9)$ theory of color-flavor unification, which needs no new fermions. This is the first model-building use of non-invertible symmetry to find a Dirac natural explanation for a small $\textit{relevant}$ parameter.

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Antonio Delgado, Seth Koren. 2024-12-06. Non-Invertible Peccei-Quinn Symmetry, Natural 2HDM Alignment, and the Visible Axion. https://doi.org/10.1007/jhep02(2025)178

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