Homological Mirror Symmetry and Fourier–Mukai Transform

Abstract

We interpret symplectic geometry as certain sheaf theory by constructing a sheaf of curved algebras which in some sense plays the role of a “structure sheaf” for symplectic manifolds. An interesting feature of this “structure sheaf” is that the symplectic form itself is part of its curvature term. Using this interpretation homological mirror symmetry can be understood by well-known duality theories in mathematics: Koszul duality or Fourier–Mukai transform. In this paper, we perform the above constructions over a small open subset inside the smooth locus of a Lagrangian torus fibration. In a subsequent work, we shall use the language of derived geometry to obtain a global theory over the whole smooth locus. However, we do not know how to extend this construction to the singular locus. As an application of the local theory, we prove a version of homological mirror symmetry between a toric symplectic manifold and its Landau–Ginzburg mirror.