Twisted gauging and topological sectors in (2+1)d abelian lattice gauge theories

• URL: http://arxiv.org/abs/2501.16301v1
• Date: Mon, 27 Jan 2025 18:39:10 GMT
• Title: Twisted gauging and topological sectors in (2+1)d abelian lattice gauge theories
• Authors: Bram Vancraeynest-De Cuiper, Clement Delcamp,
• Abstract summary: We investigate a duality operation that amounts to gauging its invertible 1-form symmetry, followed by gauging the resulting 0-form symmetry in a twisted way. We compute the non-trivial interplay between symmetry-twisted boundary conditions and charge sectors under the duality operation. We argue that this results in a symmetry structure that encodes the 2-representations of a 2-group.
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• Abstract: Given a two-dimensional quantum lattice model with an abelian gauge theory interpretation, we investigate a duality operation that amounts to gauging its invertible 1-form symmetry, followed by gauging the resulting 0-form symmetry in a twisted way via a choice of discrete torsion. Using tensor networks, we introduce explicit lattice realisations of the so-called condensation defects, which are obtained by gauging the 1-form symmetry along submanifolds of spacetime, and employ the same calculus to realise the duality operators. By leveraging these tensor network operators, we compute the non-trivial interplay between symmetry-twisted boundary conditions and charge sectors under the duality operation, enabling us to construct isometries relating the dual Hamiltonians. Whenever a lattice gauge theory is left invariant under the duality operation, we explore the possibility of promoting the self-duality to an internal symmetry. We argue that this results in a symmetry structure that encodes the 2-representations of a 2-group.

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