$G_2$-instantons, associative submanifolds, and Fueter sections
  We give a sufficient condition for an associative submanifold in a G2-manifold to appear as the bubbling locus of a sequence of G2-instantons, related to the existence of a Fueter section of a bundle of ASD instanton moduli spaces over said submanifold. 
Thomas Walpuski
math.DG