D ec 2 00 0 From the Bethe-Salpeter equation to non-relativistic approaches with effective two-body interactions


It is known that binding energies calculated from the Bethe-Salpeter equation in ladder approximation can be reasonably well accounted for by an energy-dependent interaction, at least for the lowest states. It is also known that none of these approaches gives results close to what is obtained by using the same interaction in the so-called instantaneous… (More)

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