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arxiv: 1602.08821 · v2 · pith:75ZCJVX5new · submitted 2016-02-29 · 🧮 math.SG

Lagrangian isotopy of tori in S² times S² and mathbb{C}P²

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keywords lagrangianmathbbsymplecticisotopytimestorusalongbundle
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We show that, up to Lagrangian isotopy, there is a unique Lagrangian torus inside each of the following uniruled symplectic four-manifolds: the symplectic vector space $\mathbb{R}^4$, the projective plane $\mathbb{C}P^2$, and the monotone $S^2 \times S^2$. The result is proven by studying pseudoholomorphic foliations while performing the splitting construction from symplectic field theory along the Lagrangian torus. A number of other related results are also shown. Notably, the nearby Lagrangian conjecture is established for $T^*\mathbb{T}^2$, i.e.~it is shown that every closed exact Lagrangian submanifold in this cotangent bundle is Hamiltonian isotopic to the zero-section.

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