When are Duality Defects Group-Theoretical?
| Autor: | Sun, Zhengdi, Zheng, Yunqin |
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| Rok vydání: | 2023 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | A quantum field theory with a finite abelian symmetry $G$ may be equipped with a non-invertible duality defect associated with gauging $G$. For certain $G$, duality defects admit an alternative construction where one starts with invertible symmetries with certain 't Hooft anomaly, and gauging a non-anomalous subgroup. This special type of duality defects are termed group theoretical. In this work, we determine when duality defects are group theoretical, among $G=\mathbb{Z}_N^{(0)}$ and $\mathbb{Z}_N^{(1)}$ in $2$d and 4d quantum field theories, respectively. A duality defect is group theoretical if and only if its Symmetry TFT is a Dijkgraaf-Witten theory, and we argue that this is equivalent to a certain stability condition of the topological boundary conditions of the $G$ gauge theory. By solving the stability condition, we find that a $\mathbb{Z}_N^{(0)}$ duality defect in 2d is group theoretical if and only if $N$ is a perfect square, and under certain assumptions a $\mathbb{Z}_N^{(1)}$ duality defect in 4d is group theoretical if and only if $N=L^2 M$ where $-1$ is a quadratic residue of $M$. For these subset of $N$, we construct explicit topological manipulations that map the non-invertible duality defects to invertible defects. We also comment on the connection between our results and the recent discussion of obstruction to duality-preserving gapped phases. Comment: 35 pages |
| Databáze: | arXiv |
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