  The relation between open topological strings and Chern-Simons theory was
discovered by E. Witten. He proved that A-model on T*M where M is a
three-dimensional manifold is equivalent to Chern-Simons theory on M and that
A-model on arbitrary Calabi-Yau 3-fold is related to Chern-Simons theory with
instanton corrections. In present paper we discuss multidimensional
generalization of these results.
