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Loops and trees
Journal of High Energy Physics, no. 5 (2011): 1-43
摘要
We investigate relations between loop and tree amplitudes in quantum field
theory that involve putting on-shell some loop propagators. This generalizes
the so-called Feynman tree theorem which is satisfied at 1-loop. Exploiting
retarded boundary conditions, we give a generalization to L-loop expressing the
loops as integrals over the on-s...更多
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