Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1993-06-30
Phys.Lett. B316 (1993) 496-502
Physics
High Energy Physics
High Energy Physics - Theory
13 pages, Plain TeX, BONN-HE-93-20. (A note added and a minor change at the end of section 3)
Scientific paper
10.1016/0370-2693(93)91034-K
We find a canonical $N{=}2$ superconformal algebra (SCA) in the BRST complex associated to any affine Lie algebra $\ghhat$ with $\gh$ semisimple. In contrast with the similar known results for the Virasoro, $N{=}1$ supervirasoro, and $\W_3$ algebras, this SCA does not depend on the particular ``matter'' representation chosen. Therefore it follows that every gauged WZNW model with data $(\gg\supset\gh, k)$ has an $N{=}2$ SCA with central charge $c=3\dim\gh$ independent of the level $k$. In particular, this associates to every embedding $sl(2) \subset \gg$ a one-parameter family of $c{=}9$ $N{=}2$ supervirasoro algebras. As a by-product of the construction, one can deduce a new set of ``master equations'' for generalized $N{=}2$ supervirasoro constructions which is simpler than the one considered thus far.
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