The commuting gauging diagram for fermionic symmetry-enriched string-net models

Let GG be a symmetry group, let SG\mathcal{S}_G be a GG-graded super fusion category with trivial ω2\omega_2, and let S1\mathcal{S}_1 be its trivial grading sector. The category Z1(S1)\mathcal{Z}_1(\mathcal{S}_1) carries a GfG^f-action, where GfG^f includes fermion parity. A GG-crossed extension is the extension used to gauge GG, followed by GG-equivariantization. The commuting-gauging conjecture. After gauging GG, the resulting category is

Z1(sVectCG)sVectZ1(CG)0,\mathcal{Z}_1({}^{\mathrm{sVect}}\mathcal{C}_G)\cong{}^{\mathrm{sVect}}\mathcal{Z}_1(\mathcal{C}_G)_0,

and the diagram comparing GG-gauging, fermion-parity gauging, and GfG^f-gauging commutes. The conjecture asserts compatibility between the fermionic and bosonic gauging procedures; the source notes that it uses a GG-crossed extension on the super modular category to make this diagram symmetric.

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Primary source

Jing-Ren Zhou and Zheng-Cheng Gu, “Exactly solvable models for fermionic symmetry-enriched topological phases and fermionic 't Hooft anomaly”, arXiv:2410.19126 (2026).

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