Defect entanglement entropy for superconformal RG Interfaces

2026/07/23 by Evangelos Afxonidis, Christopher Rosen
#hep-th

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Abstract

We study the defect contribution to the entanglement entropy of a spherical region centred on four-dimensional superconformal RG interfaces. These interfaces are supersymmetric codimension one defects separating the Leigh--Strassler SCFT vacuum and the N=4 SYM theory deformed by spatially varying mass terms. Exploiting the holographic dual to these interfaces, we extract a cutoff-independent interface contribution to the entanglement entropy, C^I. We quantify the non-trivial dependence of C^I on the supersymmetric mass deformation, and observe a scaling regime for large deformations. We further relate C^I to the renormalized on-shell action and the stress-tensor one-point function of the interface theory. Our results provide the first fully backreacted holographic computation of this entanglement quantity for superconformal RG interfaces in more than two dimensions.

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