Abstract:
The Gelfand–Graev transformation is used to obtain an expansion of the four-polnt function
of a scalar field (or the two-point function of a biloezl field) with respect to the two-point
functions of fields that transform in accordance with the principal series of the unitary representations of the Lorentz group and conversely. It follows from this result that the infinitecomponent fields can be regarded as composite fields.
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