Cheshire θ terms, Aharonov-Bohm effects, and axions
Abstract
We discuss unusual θ terms that can appear in field theories that allow global vortices. These `Cheshire θ terms' induce Aharonov-Bohm effects for some particles that move around vortices. For example, a Cheshire θ term can appear in QCD coupled to an axion and induces Aharonov-Bohm effects for baryons and leptons moving around axion strings.
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