Projective invariance of dual-resonance models from spin analyticity and lorentz invariance
1973
The problem of the origin of the projective invariance of the dual-resonance models is investigated. An explanation in terms of the Lorentz group is suggested via the definition of generalized spinor amplitudes in which the external « particles » are assigned to unitary, irreducible representations ofSL2.c. A generalization of the Virasoro amplitude for external spinning particles is obtained.
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