Dynamical Clockwork Axions

Abstract

The clockwork mechanism is a novel method for generating a large separation between the dynamical scale and interaction scale of a theory. We demonstrate how the mechanism can arise from a sequence of strongly-coupled sectors. This framework avoids elementary scalar fields as well as ad hoc continuous global symmetries, both of which are subject to serious stability issues. The clockwork factor, $q$, is determined by the consistency of the strong dynamics. The preserved global $U(1)$ of the clockwork appears as an accidental symmetry, resulting from discrete or $U(1)$ gauge symmetries, and it is spontaneously broken by the chiral condensates. We apply such a dynamical clockwork to construct models with an effectively invisible QCD axion from TeV-scale strong dynamics. The axion couplings are determined by the localisation of the Standard Model interactions along the clockwork sequence. The TeV spectrum includes either coloured hadrons or vector-like quarks. Dark matter can be accounted for by the axion or the lightest neutral baryons, which are accidentally stable.

41 pages

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Cited by in corpus (27)

• Experimental Targets for Photon Couplings of the QCD Axion
• Clockwork / Linear Dilaton: Structure and Phenomenology
• Clockwork Axions in Cosmology: Is Chromonatural Inflation Chrononatural?
• The Minimal Flavour Violating Axion
• A clockwork solution to the flavor puzzle
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