Speaker
Dr
Wolfgang Lucha
(Austrian Academy of Sciences)
Description
In view of the usually encountered complexity of the quantum-field-theoretic approach to (two-particle) bound states by means of the homogeneous Bethe‒Salpeter equation, this formalism is frequently subjected to various simplifying approximations. If carried to its extremes, this procedure ultimately yields semirelativistic equations of motion believed to reproduce, at least coarsely, the basic features of the bound-state solutions sought. Whether or not this belief is justified may be scrutinized by taking into account a couple of evident boundary conditions on the predicted discrete spectra, expected to hold on rather general grounds and straightforwardly applicable as soon as the underlying interaction has been specified.
Primary author
Dr
Wolfgang Lucha
(Austrian Academy of Sciences)
