Thin instantons in G_2-manifolds and Seiberg-Witten invariants
  For two nearby disjoint coassociative submanifolds C and C' in a G_2-manifold, we construct thin instantons 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. 
Naichung Conan Leung, Xiaowei Wang and Ke Zhu
math.DG math-ph math.MP math.SG