Generalized Kahler Geometry from supersymmetric sigma models
  We give a physical derivation of generalized Kahler geometry. Starting from a supersymmetric nonlinear sigma model, we rederive and explain the results of Gualtieri regarding the equivalence between generalized Kahler geometry and the bi-hermitean geometry of Gates-Hull-Rocek.   When cast in the language of supersymmetric sigma models, this relation maps precisely to that between the Lagrangian and the Hamiltonian formalisms.   We also discuss topological twist in this context. 
Andreas Bredthauer, Ulf Lindstrom, Jonas Persson and Maxim Zabzine