Global 4-group symmetry and 't Hooft anomalies in topological axion electrodynamics
arXiv:2108.12564 · doi:10.1093/ptep/ptab150
Abstract
We study higher-form global symmetries and a higher-group structure of a low-energy limit of -dimensional axion electrodynamics in a gapped phase described by a topological action. We argue that the higher-form symmetries should have a semi-strict 4-group (3-crossed module) structure by consistency conditions of couplings of the topological action to background gauge fields for the higher-form symmetries. We find possible 't Hooft anomalies for the 4-group global symmetry, and discuss physical consequences.
arXiv comment51 pages, 3 figures
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