Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2011-10-26
Physics
Nuclear Physics
Nuclear Theory
4 pp, 2 figs; Contribution to the 5th Asia-Pacific Conference on Few-Body Problems in Physics (APFB11)
Scientific paper
Although the exact Bethe-Salpeter equation is certainly the appropriate field-theoretic framework to describe the non-perturbative problem of scattering and bound states, the inevitable truncations introduce inconsistencies such as loss of symmetries or incorrect one-body limit. I conjecture that these problem can be overcome if the truncation preserves the field-redefinition invariance of the exact equation. A sum rule for light-by-light scattering can provide a testing ground of this conjecture.
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