D-branes and phases on string worldsheet Original Research Article

We generalize the worldsheet derivation of the topological open/closed string duality given in to cases when there are different types of D-branes on the open string side. We use the mirror Landau–Ginzburg description to clarify the correspondence between D-branes on the open string side and C phases on the closed string side. We also discuss the duality from the point of view of the B-model.