Coset models obtained by twisting WZW models and stringy charged black holes in four dimensions.

Abstract

We show that several WZW coset models can be obtained by applying $\mathrm{O}(d,d)$ symmetry transformations (referred to as twisting) on WZW models. This leads to a conjecture that WZW models gauged by a ${\mathrm{U}(1)}^{n}$ subgroup can be obtained by twisting (ungauged) WZW models. In addition, a class of solutions that describes charged black holes in four dimensions is derived by twisting the $\mathrm{SL}(2,R)\ifmmode\times\else\texttimes\fi{}\mathrm{SU}(2)$ WZW action.