Non-displaceable Lagrangian links in four-manifolds

preprint2021arXivOpen access

Abstract

Let ωω denote an area form on S2S^2. Consider the closed symplectic 4-manifold M=(S2×S2,Aω⊕aω)M=(S^2\times S^2, Aω\oplus a ω) with 0<a<A0<a<A. We show that there are families of displaceable Lagrangian tori L0,x, L1,x⊂ML_{0,x},\, L_{1,x} \subset M, for x∈[0,1]x \in [0,1], such that the two-component link L0,x∪L1,xL_{0,x} \cup L_{1,x} is non-displaceable for each xx.

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