paper

Higher-form symmetries and 3-group in axion electrodynamics

arXiv:2006.12532 · doi:10.1016/j.physletb.2020.135672

Abstract

We study higher-form symmetries in a low-energy effective theory of a massless axion coupled with a photon in dimensions. It is shown that the higher-form symmetries of this system are accompanied by a semistrict 3-group (2-crossed module) structure, which can be found by the correlation functions of symmetry generators of the higher-form symmetries. We argue that the Witten effect and anomalous Hall effect in the axion electrodynamics can be described in terms of 3-group transformations.

9 pages, 4 figures; v2: minor revisions, references added; v3: minor revisions, published version with more references

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