Twisted Gauge Theory Model of Topological Phases in Three Dimensions

Abstract

We propose an exactly solvable lattice Hamiltonian model of topological phases in $3+1$ dimensions, based on a generic finite group $G$ and a $4$-cocycle $\omega$ over $G$. We show that our model has topologically protected degenerate ground states and obtain the formula of its ground state degeneracy on the $3$-torus. In particular, the ground state spectrum implies the existence of purely three-dimensional looplike quasi-excitations specified by two nontrivial flux indices and one charge index. We also construct other nontrivial topological observables of the model, namely the $SL(3,\mathbb{Z})$ generators as the modular $S$ and $T$ matrices of the ground states, which yield a set of topological quantum numbers classified by $\omega$ and quantities derived from $\omega$. Our model fulfills a Hamiltonian extension of the $3+1$-dimensional Dijkgraaf-Witten topological gauge theory with a gauge group $G$. This work is presented to be accessible for a wide range of physicists and mathematicians.

37 pages, 9 figures, 4 tables; revised to improve the clarity; references added

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Cited by in corpus (8)

• Twisted gauge theories in 3D Walker-Wang models
• Entanglement Entropy, Quantum Fluctuations, and Thermal Entropy in Topological Phases
• On 2-form gauge models of topological phases
• Twisted Quantum Double Model of Topological Orders with Boundaries
• Field Theories for Gauged Symmetry Protected Topological Phases: Abelian Gauge Theories with non-Abelian Quasiparticles
• Symmetry Enrichment in Three-Dimensional Topological Phases
• From coupled wires to coupled layers: Model with three-dimensional fractional excitations
• On a self-dual phase space for 3+1 lattice Yang-Mills theory