Summary
Alternatively to the evaluation of path integrals, weak-mapping theorems of quantum fields can be used for the derivation of relativistic composite particle dynamics from a given dynamics of subcomponent fields (particles). These theorems are applied to a nonlinear spinor-isospinor field with nonperturbative Pauli-Villars regularization and canonical quantization, where vector boson states were calculated as two-fermion (spinor-isospinor) composites. In the low-energy limit the weak mapping of the functional equation of this quantized spinor field leads to the field-theoretic functional equations for a Yang-Mills field which governs the dynamics of the composite vector bosons. In the framework of these theorems the quantum properties of this mappedSU(2) field are also derived.
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Stumpf, H., Pfister, W. Yang-mills dynamics as an effective theory of composite vector bosons. Nuov Cim A 105, 677–694 (1992). https://doi.org/10.1007/BF02730773
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DOI: https://doi.org/10.1007/BF02730773