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Feb 14, 2021 at 18:57 comment added Carlo Beenakker thank you; the non-self-adjointness may be an issue, but what I understand is that the eigenfunctions are plane-wave-like scattering states, not bound states, so their orthonormality involves a delta function.
Feb 14, 2021 at 17:12 comment added Nik Weaver Fantastic! That is just the sort of thing I wanted. I suppose ordinary spectral theory doesn't apply because the operator isn't self-adjoint.
Feb 14, 2021 at 16:34 history edited Carlo Beenakker CC BY-SA 4.0
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Feb 14, 2021 at 16:28 history answered Carlo Beenakker CC BY-SA 4.0