Fermionic Finite-Group Gauge Theories and Interacting Symmetric/Crystalline Orders via Cobordisms

Dec 31, 2018
82 pages
Published in:
  • Commun.Math.Phys. 376 (2020) 2, 1073-1154
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DOI:

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Abstract: (Springer)
We formulate a family of spin Topological Quantum Filed Theories (spin-TQFTs) as fermionic generalization of bosonic Dijkgraaf-Witten TQFTs. They are obtained by gauging GG-equivariant invertible spin-TQFTs, or, in physics language, gauging the interacting fermionic Symmetry Protected Topological states (SPTs) with a finite group GG symmetry. We use the fact that the latter are classified by Pontryagin duals to spin-bordism groups of the classifying space BGBG. We also consider unoriented analogues, that is GG-equivariant invertible pin±^\pm-TQFTs (fermionic time-reversal-SPTs) and their gauging. We compute these groups for various examples of abelian GG using Adams spectral sequence and describe all corresponding TQFTs via certain bordism invariants in dimensions 3, 4, and other. This gives explicit formulas for the partition functions of spin-TQFTs on closed manifolds with possible extended operators inserted. The results also provide explicit classification of 't Hooft anomalies of fermionic QFTs with finite abelian group symmetries in one dimension lower. We construct new anomalous boundary deconfined spin-TQFTs (surface fermionic topological orders). We explore SPT and SET (symmetry enriched topologically ordered) states, and crystalline SPTs protected by space-group (e.g. translation Z\mathbb{Z}) or point-group (e.g. reflection, inversion or rotation CmC_m) symmetries, via the layer-stacking construction.
Note:
  • 81 pages, 28 figures
  • field theory: topological
  • fermion: interaction
  • group: abelian
  • group: finite
  • partition function
  • deconfinement
  • crystal
  • anomaly
  • time reversal