Cheshire $\hat{I}¸$ terms, Aharonov-Bohm effects, and axions

Abstract

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

7 pages, 2 figures. v2: minor clarifications