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Physical Spectra in String Theories --- BRST Operators and Similarity Transformations

Mitsuhiro Kato

hep-tharXiv:hep-th/9512201

Abstract

Several examples of similarity transformations connecting two string theories with different backgrounds are reviewed. We also discuss general structure behind the similarity transformations from the point of view of the topological conformal algebra and of the non-linear realization of gauge symmetry.

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