Electric/Magnetic Deformations of S^3 and AdS_3, and Geometric Cosets
Electric/Magnetic Deformations of S^3 and AdS_3, and Geometric Cosets
We analyze asymmetric marginal deformations of SU(2)_k and SL(2,R)_k WZW models. These appear in heterotic string backgrounds with non-vanishing Neveu--Schwarz three-forms plus electric or magnetic fields, depending on whether the deformation is elliptic, hyperbolic or parabolic. Asymmetric deformations create new families of exact string vacua. The geometries which are generated …