Framing anomaly is a key property of $(2+1)d$ chiral topological orders, for it reveals that the chirality is an intrinsic bulk property of the system, rather than a property that requires a boundary between two systems. Understanding framing anomaly in lattice models is particularly interesting, as concrete, solvable lattice models of chiral topological orders are rare. In a previous work [Z.-A. Xu and J.-Y. Chen, J. High Energy Phys. 08 (2025) 062.], we defined and solved the U(1) Chern-Simons-Maxwell theory on spacetime lattice, showing its chiral edge mode and the associated gravitational anomaly on boundary. In this Letter, we show its framing anomaly in the absence of boundary by computing the expectation of a lattice version of the modular $T$ operator in the ground subspace on a spatial torus, from which we extract that $⟨T⟩$ has a universal phase of $-2\pi /12$ as expected: $-2\pi /8$ from the Gauss-Milgram sum of the topological spins of the ground states, and $2\pi /24$ from the framing anomaly. We can also extract the $2\pi /24$ framing anomaly phase alone from the full spectrum of $T$ in the ground subspace by computing $⟨T^m⟩$. This pins down the last and most crucial property required for a valid lattice definition of U(1) Chern-Simons theory.

Close

PrevNext

Reuse & PermissionsView figure in article

• 
• 
• 
• 
• 
• 
• 
• 
• 

• Chern-Simons gauge theory
• Lattice gauge theory
• Topological field theories
• Topology