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Higher-Dimensional QCD without the Strong CP Problem
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QCD in a five-dimensional sliced bulk with chiral extra-quarks on the boundaries is generically free from the strong CP problem. Accidental axial symmetry is naturally present except for suppressed breaking interactions, which plays a role of the Peccei-Quinn symmetry to make the strong CP phase sufficiently small.
Forward citations
Cited by 3 Pith papers
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Deconstructing the Extra-Dimensional Axion
A 4D moose gauge theory with gauged WZW term deconstructs the 5D orbifold axion, reproducing its shift symmetry, instanton effects, and quality features via collective PNGB dynamics.
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A quality-coupling relation in chiral $U(1)_{B-L}$ axion model
In this chiral U(1)_{B-L} axion model, demanding high axion quality forces a minimal axion-electron coupling that can exceed standard KSVZ-model predictions.
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Wiggly dilaton: a landscape of spontaneously broken scale invariance
A 5D axion-like field with periodic brane potentials gives the dilaton a wiggly potential with multiple vacua, enabling relaxion-like or light-dilaton scenarios at the cost of fine-tuning.
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