Higher cup products on hypercubic lattices: application to lattice models of topological phases

Abstract

In this paper, we derive the explicit formula for higher cup products on hypercubic lattices, based on the recently developed geometrical interpretation in the simplicial case. We illustrate how this formalism can elucidate lattice constructions on hypercubic lattices for various models and deriving them from spacetime actions. In particular, we demonstrate explicitly that the (3+1)D SPT $S=\frac{1}{2}\int w_2^2+w_1^4$ (where $w_1$ and $w_2$ are the first and second Stiefel-Whitney classes) is dual to the 3-fermion Walker-Wang model constructed on the cubic lattice by Burnell-Chen-Fidkowski-Vishwanath. Other examples include the double-semion model, and also the `fermionic' toric code in arbitrary dimensions on hypercubic lattices. In addition, we extend previous constructions of exact boson-fermion dualities and the Gu-Wen Grassmann Integral to arbitrary dimensions. Another result which may be of independent interest is a derivation of a cochain-level action for the generalized double-semion model, reproducing a recently derived action on the cohomology level.

56 pages, 26 figures, v2: corrected typos

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