Abstract

The no-ghost theorem of Brower for the conventional dual model (intercept ${\ensuremath{\alpha}}_{0}=1$) is extended to the Neveu-Schwarz model, and its spectrum-generating algebra is constructed. These conformally invariant generators (${A}_{n}, {B}_{s}$) are obtained by a systematic use of the gauges ${G}_{r}$. As a consequence it is demonstrated that particular dual models having resonances with positive-definite norms and masses are possible.

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