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A Hierarchy of Superstrings

Fiorenzo Bastianelli, Nobuyoshi Ohta, Jens Lyng Petersen

hep-tharXiv:hep-th/9403150

Abstract

We construct a hierarchy of supersymmetric string theories by showing that the general N-extended superstrings may be viewed as a special class of the (N+1)-extended superstrings. As a side result, we find a twisted (N+2) superconformal algebra realized in the N-extended string.

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