The infinite mass limit of the two-particle Green's function in QED

Details The infinite mass limit of the two-particle Green's function in QED The infinite mass limit of the two-particle Green's function in QED

1997-04-07

arxiv.org/abs/hep-th/9704048v1

J.Phys.G23:875-883,1997

Physics

High Energy Physics

High Energy Physics - Theory

13 pages, Tex, no figures

Scientific paper

10.1088/0954-3899/23/8/002

The behavior of the two-particle Green's function in QED is analyzed in the limit when one of the particles becomes infinitely massive. It is found that the dependences of the Green's function on the relative times of the ingoing and outgoing particles factorize and that the bound state spectrum is the same as that of the Dirac equation with the static potential created by the heavy particle. The Bethe-Salpeter wave function is also determined in terms of the Dirac wave function. The present result excludes the existence, in the above limit, of abnormal solutions due to relative time excitations as predicted by the Bethe-Salpeter equation in the ladder approximation.

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