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

A natural and simple UV completion of the QCD axion model