From the Bethe-Salpeter equation to non-relativistic approaches with effective two-body interactions

por Lukas Theussl (Univesidad de Valencia)

jueves 17 ene. 2002 12:30 → 13:30 Europe/Madrid

Sala Seminarios (Dpto. de Física Teórica (UVEG))

Regarding the scalar two-body bound state problem, we present an investigation of different three-dimensional approaches that follow from the Bethe-Salpeter equation in a certain non-relativistic reduction scheme. These approaches include in particular an equation whose interaction depends on the total energy of the system. It is shown that such an equation is able to account for a certain number of properties of the Bethe-Salpeter equation, in particular, that there also arise abnormal solutions in such an approach. We conclude that the main difference between the Bethe-Salpeter results and the instantaneous approximation ones are not due to relativity, as often conjectured.