The Gauged WZNW Model Perturbed by the Sigma Model Term

Details The Gauged WZNW Model Perturbed by the Sigma Model Term The Gauged WZNW Model Perturbed by the Sigma Model Term

1994-03-17

arxiv.org/abs/hep-th/9403097v2

Physics

High Energy Physics

High Energy Physics - Theory

LaTex file, 7 pages, Preprint QMW 94-6. One important reference added

Scientific paper

We discuss special perturbations of the gauged level $k$ WZNW model inspired by the $\sigma$-model perturbation of the nonunitary WZNW model. In the large $k$ limit there is a second conformal point in the vicinity of the ultarviolet fixed point. At the second critical point the conformal model has a rational Virasoro central charge which no longer corresponds to a coset construction. In spite of this fact the perturbative conformal model appears to be a unitary system as long as the underlying coset construction at the ultraviolet critical point is unitary.

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