A Class of String Backgrounds as a Semiclassical Limit of WZW Models
D. I. Olive, E. Rabinovici, A. Schwimmer
Abstract
A class of string backgrounds associated with non semi-simple groups is obtained as a special large level limit of ordinary WZW models. The models have an integer Virasoro central charge and they include the background recently studied by Nappi and Witten.
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