Abstract
An exploration is made on how the spontaneous symmetry breaking occurs as a collective phenomenon of many partons. The fishing-net Feynman diagram is calculated by means of the functional integral method. This method gives rise to a constraint, as a reflection of the symmetry, on the fields defined on the two-dimensional world sheet. This constraint shows non-independence among the components of the fields and is just the two-dimensional analogue of that proposed in the nonlinear σ model. The full symmetry is realized nonlinearly and the Goldstone mechanism appears, after elimination of the dependent components.
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