The Gauged WZNW Model Perturbed by the Sigma Model Term

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We discuss special perturbations of the gauged level $k$ WZNW model inspired by the $σ$-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.
LaTex file, 7 pages, Preprint QMW 94-6. One important reference added

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High Energy Physics - Theory

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http://salesiana.dossiersoluciones.com/handle/123456789/148344

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/hep-th/9403097
 http://arxiv.org/abs/hep-th/9403097

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arXiv