Higher symmetry and gapped phases of gauge theories

Abstract

We study topological field theory describing gapped phases of gauge theories where the gauge symmetry is partially Higgsed and partially confined. The TQFT can be formulated both in the continuum and on the lattice and generalizes Dijkgraaf-Witten theory by replacing a finite group by a finite 2-group. The basic field in this TQFT is a 2-connection on a principal 2-bundle. We classify topological actions for such theories as well as loop and surface observables. When the topological action is trivial, the TQFT is related to a Dijkgraaf-Witten theory by electric-magnetic duality, but in general it is distinct. We propose the existence of new phases of matter protected by higher symmetry.

33 pages, 2 figures. significantly reworked version, with corrected 1-form gauge transformations in the lattice theory, and a lattice description of ground states and global symmetry actions of higher SPT phases in the "group cohomology basis" similar to Chen-Gu-Liu-Wen

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