Physics Asked on February 7, 2021
Considering a bosonic $phi^4$-theory:
If I know that a certain connected Feynman diagram has a vanishing contribution. Does this imply that all larger connected diagrams containing this diagram are also vanishing in the general case?
In my specific problem, all diagrams contributing to the self-energy are zero. Is the implication true for this case?
A simple example would be: If the order one tadpole diagram and larger diagrams containing this tadpole diagram.
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