Non-displaceable Lagrangian links in four-manifolds

Non-displaceable Lagrangian links in four-manifolds

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Cheuk Yu Mak, The University of Edinburgh

Zoom link:  :  https://umontreal.zoom.us/j/94366166514?pwd=OHBWcGluUmJwMFJyd2IwS1ROZ0FJdz09    

One of the earliest fundamental applications of Lagrangian Floer theory is detecting the non-displaceability of a Lagrangian submanifold.  Many progress and generalizations have been made since then but little is known when the Lagrangian submanifold is disconnected.  In this talk, we describe a new idea to address this problem.  Subsequently, we explain how to use Fukaya-Oh-Ohta-Ono and Cho-Poddar theory to show that for every S^2 \times S^2 with a non-monotone product symplectic form, there is a continuum of disconnected, non-displaceable Lagrangian submanifolds such that each connected component is displaceable. 

This is a joint work with Ivan Smith.