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Results tagged with perturbation-theory
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user 3036
Perturbation theory refers to methods for understanding physical systems by treating them as small modifications to exactly solvable systems.
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Feynman rules for a general Lagrangian
How do I find the Feynman rules for a general Lagrangian density?
For example the Lagrangian $$L = \partial_\mu \psi \partial^\mu \psi +a \psi\partial_\mu \psi \partial^\mu \psi+b \psi^2 \partial_\mu …
