## Fields and particles: field theory and dispersion relations |

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### Contents

Preface | 1 |

Quantization of Free Fields | 21 |

Quantization of Interacting Fields | 102 |

Copyright | |

6 other sections not shown

### Common terms and phrases

absorptive approximation assume Bethe-Salpeter equation calculation canonical commutation relations canonical equations charge conjugate conservation coupling constant cross section decay defined denotes derive Dirac equation discussed dispersion relation dispersion theory divergent electrodynamics electron energy evaluate expression Feynman amplitude Feynman diagram Feynman-Dyson theory field equations field operators field theory Figure form factor Fourier given Green's functions Hamiltonian density Heisenberg operators Heisenberg representation Hence integral equation interaction representation introduce isospin Klein-Gordon equation Lagrangian density Lorentz condition Lorentz invariant lowest-order mass matrix element meson momenta normalization nucleon obtain pa(x perturbation theory Phys pion pion-nucleon pole preceding section problem propagation function quantization quantum reduces reduction formula renormalized result S-matrix satisfies scalar photons scattering amplitude Schrodinger self-energy solution spacelike spin spinless spinor tion transformation unitarity condition vacuum expectation value vanishes variables vector vertex function wave function write