Immersed Lagrangian deformations of a branched covering of a special   Lagrangian 3-sphere in a Calabi-Yau 3-fold and its deviation from Joyce's   criteria: Potential image-support rigidity of A-branes that wrap around a sL   $S^3$
  Using a hyperK\"{a}hler rotation on complex structures of a Calabi-Yau 2-fold and rolling of an isotropic 2-submanifold in a symplectic 6-manifold, we construct, by gluing, a natural family of immersed Lagrangian deformations of a branched covering of a special Lagrangian 3-sphere in a Calabi-Yau 3-fold and study how they deviate from being deformable to a family of special Lagrangian deformations by examining in detail Joyce's criteria on this family. The result suggests a potential image-support rigidity of A-branes that wrap around a special Lagrangian 3-sphere in a Calabi-Yau 3-fold, which resembles a similar phenomenon for holomorphic curves that wrap around a rigid smooth rational curve in a Calabi-Yau 3-fold in Gromov-Witten theory. 
Chien-Hao Liu and Shing-Tung Yau
math.DG hep-th math.AG math.SG