Quantum Field Theory/Interacting quantum fields

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Schwinger-Dyson equations

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Interaction Lagrangians and coupling constans. Interaction representation for the time evolution of the state vector. S-matrix. Cross sections.

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Covariant perturbation theory. T-product and N-product of the field operators. Propagators. Wick's theorem.

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Interaction of fermions and bosons, Lint=-gψψ(φ+φ+). Feynman rules in coordinate and momentum space. Scattering of fermions. Non-relativistic limit. One boson exchange potential.

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