paper

Global 3-group symmetry and 't Hooft anomalies in axion electrodynamics

arXiv:2009.14368 · doi:10.1007/JHEP01(2021)173

Abstract

We investigate a higher-group structure of massless axion electrodynamics in dimensions. By using the background gauging method, we show that the higher-form symmetries necessarily have a global semistrict 3-group (2-crossed module) structure, and exhibit 't Hooft anomalies of the 3-group. In particular, we find a cubic mixed 't Hooft anomaly between 0-form and 1-form symmetries, which is specific to the higher-group structure.

30 + 39 pages, 46 figures; v2: references and discussions added, published version

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