On D-branes in the Nappi-Witten and GMM gauged WZW models
Abstract
We construct D-branes in the Nappi-Witten (NW) and Guadagnini-Martellini-Mintchev (GMM) gauged WZW models. For the SL(2,R)× SU(2)/U(1)× U(1) NW and SU(2)× SU(2)/U(1) GMM models we present the explicit equations describing the D-brane hypersurfaces in their target spaces. In the latter case we show that the D-branes are classified according to the Cardy theorem. We also present the semiclassical mass computation and find its agreement with the CFT predictions.
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