Key points are not available for this paper at this time.
For some electrostatic potentials, such as that represented by a sufficiently deep well, the Pauli-Weisskopf wave equation has complex frequencies. It is shown that when this happens the quantized field Hamiltonian can no longer be diagonalized. Some points of similarity and difference between this theory and the Dirac positron theory are discussed.
Schiff et al. (Thu,) studied this question.