Abstract
We discuss a strategy to construct gapped boundaries for a large class of symmetry-protected topological phases (SPT phases) beyond group cohomology. This is done by a generalization of the symmetry extension method previously used for cohomo- logical SPT phases. We find that this method allows us to construct gapped boundaries for time-reversal-invariant bosonic SPT phases and for fermionic Gu-Wen SPT phases for arbitrary finite internal symmetry groups.
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ArXiv ePrint: 1905.05391
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Kobayashi, R., Ohmori, K. & Tachikawa, Y. On gapped boundaries for SPT phases beyond group cohomology. J. High Energ. Phys. 2019, 131 (2019). https://doi.org/10.1007/JHEP11(2019)131
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DOI: https://doi.org/10.1007/JHEP11(2019)131