DG-resolutions of NC-smooth thickenings and NC-Fourier-Mukai transforms

Abstract

We give a construction of NC-smooth thickenings (a notion defined by Kapranov in math/9802041) of a smooth variety equipped with a torsion free connection. We show that a twisted version of this construction realizes all NC-smooth thickenings as 0th cohomology of a differential graded sheaf of algebras, similarly to Fedosov's construction in \cite{Fed}. We use this dg resolution to construct and study sheaves on NC-smooth thickenings. In particular, we construct an NC version of the Fourier-Mukai transform from coherent sheaves on a (commutative) curve to perfect complexes on the canonical NC-smooth thickening of its Jacobian. We also define and study analytic NC-manifolds. We prove NC-versions of some of GAGA theorems, and give a $C^\infty$-construction of analytic NC-thickenings that can be used in particular for Kahler manifolds with constant holomorphic sectional curvature. Finally, we describe an analytic NC-thickening of the Poincare line bundle for the Jacobian of a curve, and the corresponding Fourier-Mukai functor, in terms of A-infinity structures.