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math-ph2018
The low-energy TQFT of the generalized double semion model
Arun Debray
The generalized double semion (GDS) model, introduced by Freedman and Hastings, is a lattice system similar to the toric code, with a gapped Hamiltonian whose definition depends on…
math-ph2018
The Arf-Brown TQFT of Pin Surfaces
Arun Debray, Sam Gunningham
The Arf-Brown invariant is an 8th root of unity associated to a surface equipped with a pin structure. In this note we investigate a certain fully extended…