Interface entropy for half-BPS interfaces in N=(4,4) 2D CFTs is given by the Kähler diastasis and is invariant under conformal manifold isometries, yielding a non-renormalization theorem.
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Nonrenormalization Theorem for ${\cal N}=(4,4)$ Interface Entropy
Interface entropy for half-BPS interfaces in N=(4,4) 2D CFTs is given by the Kähler diastasis and is invariant under conformal manifold isometries, yielding a non-renormalization theorem.