Topological defect junctions in 4-dimensional pure Z2 lattice gauge theory

We explore topological defects and their properties in 4-dimensional pure Z(2) lattice gauge theory. This theory has the Kramers-Wannier-Wegner(KWW) duality. Duality defects associated with the KWW duality are constructed and shown to be non-invertible topological defects. In this paper, we explore the crossing relations including the duality defects. We construct 1-form Z(2) center symmetry defects and defect junctions. Crossing relations are derived from these defects and defect junctions. We also calculate some expectation values of topological defects by crossing relations.