A natural and simple UV completion of the QCD axion model

Abstract

The novel PQ mechanism replaces the strong CP problem with some challenges in a model building. In particular, the challenges arise regarding i) the origin of an anomalous global symmetry called a PQ symmetry, ii) the scale of the PQ symmetry breaking, and iii) the quality of the PQ symmetry. In this letter, we provide a natural and simple UV completed model that addresses these challenges. Extra quarks and anti-quarks are separated by two branes in the Randall-Sundrum ${\mathbf{R}}^4\times S^1/{\mathbf{Z}}_2$ spacetime while a hidden SU($N_H$) gauge field condensates in the bulk. The brane separation is the origin of the PQ symmetry and its breaking scale is given by the dynamical scale of the SU($N_H$) gauge interaction. The (generalized) Casimir force of SU($N_H$) condensation stabilizes the 5th dimension, which guarantees the quality of the PQ symmetry.

arXiv comment6 pages, 1 figure

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Cited by in corpus (10)

• Chiral models of composite axions and accidental Peccei-Quinn symmetry
• Strong CP problem and axion dark matter with small instantons
• Axion Quality from Superconformal Dynamics
• Axion Quality Problem Alleviated by Non-Minimal Coupling to Gravity
• Baryon Asymmetric Universe from Spontaneous CP Violation
• Exact accidental U(1) symmetries for the axion
• High Quality Axion via a Doubly Composite Dynamics
• Dynamics of Superconformal Axion: Quality and Scalegenesis
• Peccei-Quinn Symmetry Breaking via Asymptotically Safe Dynamical Scalegenesis: A Walking Axicolor and Axion
• The axion flavour connection