The imaginary cubic oscillator is reinterpreted as an unphysical intrinsic exceptional point that can only be recovered as a singular limit of suitably perturbed Hamiltonians.
Perturbation Theory for Linear Operators ; Springer: Berlin, Germany, 1966
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Intrinsic exceptional point -- a challenge in quantum theory
The imaginary cubic oscillator is reinterpreted as an unphysical intrinsic exceptional point that can only be recovered as a singular limit of suitably perturbed Hamiltonians.