Strings from $N=2$ Gauged Wess-Zumino-Witten Models

Details Strings from $N=2$ Gauged Wess-Zumino-Witten Models Strings from $N=2$ Gauged Wess-Zumino-Witten Models

1995-11-07

arxiv.org/abs/hep-th/9511049v1

Commun.Math.Phys. 181 (1996) 91

Physics

High Energy Physics

High Energy Physics - Theory

50 pages, LaTeX

Scientific paper

10.1007/BF02101674

We present an algebraic approach to string theory. An embedding of $sl(2|1)$ in a super Lie algebra together with a grading on the Lie algebra determines a nilpotent subalgebra of the super Lie algebra. Chirally gauging this subalgebra in the corresponding Wess-Zumino-Witten model, breaks the affine symmetry of the Wess-Zumino-Witten model to some extension of the $N=2$ superconformal algebra. The extension is completely determined by the $sl(2|1)$ embedding. The realization of the superconformal algebra is determined by the grading. For a particular choice of grading, one obtains in this way, after twisting, the BRST structure of a string theory. We classify all embeddings of $sl(2|1)$ into Lie super algebras and give a detailed account of the branching of the adjoint representation. This provides an exhaustive classification and characterization of both all extended $N=2$ superconformal algebras and all string theories which can be obtained in this way.

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