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- W2019997109 abstract "Levinson's theorem for the Dirac equation is known in the form of a sum of positive and negative energy phase shifts at zero momentum related to the total number of bound states. In this Letter we prove a stronger version of Levinson's theorem valid for positive and negative energy phase shifts separately. The surprising result is that, in general, the phase shifts for each sign of the energy do not give the number of bound states with the same sign of the energy (in units of ensuremath{pi}), but instead are related to the number of bound states of a certain Schrodinger equation, which coincides with the Dirac equation at zero momentum." @default.
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- W2019997109 date "1993-04-26" @default.
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- W2019997109 title "Levinson’s theorem for the Dirac equation" @default.
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- W2019997109 doi "https://doi.org/10.1103/physrevlett.70.2507" @default.
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