Thin instantons in G2 manifolds and Seiberg-Witten invariants

For two nearby disjoint coassociative submanifolds C and C' in a G2 
manifold, we construct thin instantons (associative submanifolds) with 
boundaries lying on C and C' from regular J-holomorphic curves in C. We 
explain their relationship with the Seiberg-Witten invariants for C. This 
is a joint work with Naichung Conan Leung and Xiaowei Wang.