Aspects of Wzw Models at Critical Level *

Abstract

We consider non-compact WZW models at critical level (equal to the dual Coxeter number) as tensionless limits of gravitational backgrounds in string theory. Special emphasis is placed on the Euclidean black hole coset SL(2, R)k/U(1) when k = 2. In this limit gravity decouples in the form of a Liouville field with infinite background charge and the world… (More)

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