In a PT-symmetric Kondo impurity model the impurity entropy flows monotonically from ln4 (UV) to 0 (IR) even though the boundary interaction is non-unitary.
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Monotonic Impurity Entropy beyond Unitarity: the $\mathscr{PT}-$Symmetric Quantum Impurity Model
In a PT-symmetric Kondo impurity model the impurity entropy flows monotonically from ln4 (UV) to 0 (IR) even though the boundary interaction is non-unitary.