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Physics · L5 · Quantum Field Theory: Fields, Propagators, and Feynman Diagrams · flowchart

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🌐 Interaction Lagrangian ℒ_intDyson series: expand S-matrix in powers of couplingWick's theorem: contract fields into propagatorsSum over all Feynman diagrams at each orderScattering amplitude 𝓜 (Feynman rules)✨ Cross section / decay rate: |𝓜|² × phase space

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