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• W4383346763 abstract "Charged massive scalar fields on charged black hole backgrounds are investigated through methods of spectral analysis in Krein spaces. We consider, on the three charged black hole backgrounds (Nariai, Reissner-Nordström, ultracold-II) taken into account, a necessary condition for the existence of complex eigenvalues. We show that even if it is satisfied, in two cases (Nariai and ultracold-II), by direct calculation, they actually cannot exist. In both cases, the Klein paradox occurs without restriction on the parameters. In the third case, the condition for their existence is shown to coincide with the condition, allowing the quantum discharge phenomenon associated with the Klein paradox. We also clarify the role of “classical potentials,” which appear in the physical literature on the subject, giving rise to the so-called level-crossing appearing in semiclassical calculations, and we comment on problems occurring in quantum field theory in the presence of complex eigenvalues." @default.
• W4383346763 created "2023-07-07" @default.
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• W4383346763 date "2023-07-01" @default.
• W4383346763 modified "2023-09-24" @default.
• W4383346763 title "Spectral properties for the Klein-Gordon Hamiltonian in charged black hole backgrounds" @default.
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• W4383346763 doi "https://doi.org/10.1063/5.0137054" @default.
• W4383346763 hasPublicationYear "2023" @default.
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