β Scribed by S Fubini; G Veneziano
No coin nor oath required. For personal study only.
The Ward-like identities previously proposed in order to eliminate unphysical states (ghosts) from dual amplitudes and generalized by Virasoro, are investigated within the context of the projective operator language. We are able to generalize further Virasoro's result to the case of amplitudes with different internal trajectories and to release his unphysical condition on the external masses. A purely algebraic treatment of the problem of ghost cancellation is also presented and shown to provide cancellation of ghosts up to the third excited level.
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