dorsal/arxiv
View SchemaBethe-Salpeter equation: 3D reductions, heavy mass limits and abnormal solutions
| Authors | J. Bijtebier |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9703028 |
| URL | https://arxiv.org/abs/nucl-th/9703028 |
| DOI | 10.1016/S0375-9474(97)00462-4 |
| Journal | Nucl.Phys. A623 (1997) 498-518 |
Abstract
We show that the 3D reductions of the Bethe-Salpeter equation have the same bound state spectrum as the original equation, with the possible exception of some solutions for which the corresponding 3D wave function vanishes. The abnormal solutions of the Bethe-Salpeter equation (corresponding to excitations in the relative time-energy degree of freedom), when they exist, are recovered in the 3D reductions via a complicated dependence of the final potential on the total energy. We know however that the one-body (or one high mass) limit of some 3D reductions of the exact Bethe-Salpeter equation leads to a compact 3D equation (by a mutual cancellation of the ladder and crossed graph contributions), which does not exhibit this kind of dependence on the total energy anymore. We conclude that the exact Bethe-Salpeter equation has no abnormal solution at this limit, or has only solutions for which our 3D wave function vanishes. This is in contrast with the results of the ladder approximation, where no such cancellation occurs. We draw the same conclusions for the static model, which we obtain by letting the mass of the lighter particle go also to infinity. These results support Wick's conjecture that the abnormal solutions are a spurious consequence of the ladder approximation.
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"abstract": "We show that the 3D reductions of the Bethe-Salpeter equation have the same\nbound state spectrum as the original equation, with the possible exception of\nsome solutions for which the corresponding 3D wave function vanishes. The\nabnormal solutions of the Bethe-Salpeter equation (corresponding to excitations\nin the relative time-energy degree of freedom), when they exist, are recovered\nin the 3D reductions via a complicated dependence of the final potential on the\ntotal energy. We know however that the one-body (or one high mass) limit of\nsome 3D reductions of the exact Bethe-Salpeter equation leads to a compact 3D\nequation (by a mutual cancellation of the ladder and crossed graph\ncontributions), which does not exhibit this kind of dependence on the total\nenergy anymore. We conclude that the exact Bethe-Salpeter equation has no\nabnormal solution at this limit, or has only solutions for which our 3D wave\nfunction vanishes. This is in contrast with the results of the ladder\napproximation, where no such cancellation occurs. We draw the same conclusions\nfor the static model, which we obtain by letting the mass of the lighter\nparticle go also to infinity. These results support Wick\u0027s conjecture that the\nabnormal solutions are a spurious consequence of the ladder approximation.",
"arxiv_id": "nucl-th/9703028",
"authors": [
"J. Bijtebier"
],
"categories": [
"nucl-th",
"hep-th"
],
"doi": "10.1016/S0375-9474(97)00462-4",
"journal_ref": "Nucl.Phys. A623 (1997) 498-518",
"title": "Bethe-Salpeter equation: 3D reductions, heavy mass limits and abnormal solutions",
"url": "https://arxiv.org/abs/nucl-th/9703028"
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