AdS-CFT Correspondence, Conformal and W Symmetry, Conformal Field Models in String Theory, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798

Abstract In this brief note we calculate the entanglement entropy in M ⊗N /S N symmetric orbifold CFTs in the presence of topological defects, which were recently constructed in [1, 2]. We consider both universal defects which realize Rep(S N ) non-invertible symmetry and non-universal defects. We calculate the sub-leading defect entropy/g-factor for defects at the boundary of the entangling surface as well as inside it.