TL;DR
This paper introduces models where the QCD axion appears accidentally from confining gauge theories, with properties dictated by new fermions, and explores their theoretical underpinnings and generalizations.
Contribution
It generalizes previous axion models within a unified framework, including chiral gauge theories and deconstructed 5D theories, highlighting new mechanisms for accidental Peccei-Quinn symmetry.
Findings
Models produce axion candidates with properties determined by new fermions.
Some models can be viewed as deconstructed 5D gauge theories.
The Peccei-Quinn symmetry can emerge accidentally in chiral gauge theories.
Abstract
We present several models where the QCD axion arises accidentally. Confining gauge theories can generate axion candidates whose properties are uniquely determined by the quantum numbers of the new fermions under the Standard Model. The Peccei-Quinn symmetry can emerge accidentally if the gauge theory is chiral. We generalise previous constructions in a unified framework. In some cases these models can be understood as the deconstruction of 5-dimensional gauge theories where the Peccei-Quinn symmetry is protected by locality but more general constructions are possible.
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