A worm-algorithm boundary-deformation method computes ∂ℓ entanglement entropy in finite-density O(N) models, with initial O(4) results in 3D and an internal consistency check.
Rindlisbacher,Lattice Field Theory at Finite Density, Ph.D
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Lattice studies of entanglement entropy in $O(N)$ models at finite densities
A worm-algorithm boundary-deformation method computes ∂ℓ entanglement entropy in finite-density O(N) models, with initial O(4) results in 3D and an internal consistency check.