Yong-Geun Oh
This paper is withdrawn by the author due to a critical error in the proof of the main theorem, Theorem 3.10. (More specifically the identity (5.18) is incorrect in that the $T^*S^1(2)$-factor is missing in the right hand side of the equality.) Therefore the uniquenss question for $L^{(1,\infty)}$-case is still open.
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Embeddings and disjunction of Lagrangian pinwheels via rational blow-ups
本文利用辛有理爆破研究辛有理流形中的拉格朗日风车，确定了哪些辛形式允许拉格朗日射影平面经哈密顿同痕分离，并回答了 J. Evans 关于 $S^2\times S^2$ 上 $L_{3,1}$ 风车的问题。
We present a new and simpler proof of the fact that any Lagrangian $\mathbb{R}P^2$ in $T^*\mathbb{R}P^2$ is Hamiltonian isotopic to the zero section. Our proof mirrors the one given by Li and Wu for the Hamiltonian uniqueness of Lagrangians in $T^*S^2$, using surgery to turn Lagrangian spheres into symplectic ones. The main novel contribution is a detailed proof of the folklore fact that the complement of a symplectic quadric in $\mathbb{C}P^2$ can be identified with the unit cotangent disc bundle of $\mathbb{R}P^2$.
Given a smooth compact Riemannian manifold $M$ and a Hamiltonian $H$ on the cotangent space $T^*M$, strictly convex and superlinear in the momentum variables, we prove uniqueness of certain ergodic invariant Lagrangian graphs within a given homology or cohomology class. In particular, in the context of quasi-integrable Hamiltonian systems, our result implies global uniqueness of Lagrangian KAM tori with rotation vector $ρ$. This result extends generically to the $C^0$-closure of KAM tori.
We prove that a real Lagrangian submanifold in a closed symplectic manifold is unique up to cobordism. We then discuss the classification of real Lagrangians in $\mathbb{C} P^2$ and $S^2\times S^2$. In particular, we show that a real Lagrangian in $\mathbb{C} P^2$ is unique up to Hamiltonian isotopy and that a real Lagrangian in $S^2\times S^2$ is either Hamiltonian isotopic to the antidialgonal sphere or Lagrangian isotopic to the Clifford torus.
Quantitative Thomas-Yau uniqueness
该研究在弗洛尔理论条件下，通过拉格朗日角小尺度性得到两个拉格朗日量接近程度的定量估计，应用于特殊拉格朗日量的强弱唯一性定理及变分收敛性刻画。
The spread construction and non-uniqueness of visible Lagrangians
研究 Hirzebruch 曲面中可见拉格朗日量的性质，通过新的展开构造证明其包含拉格朗日环面和克莱因瓶，且其拓扑不由矩映射像决定。
We show that zero-Maslov class Lagrangian self-expanders in C^n which are asymptotic to a pair of planes intersecting transversely are locally unique if n>2 and unique if n=2.
The following interesting quantity was introduced by K. Cieliebak and K. Mohnke for a Lagrangian submanifold $L$ of a symplectic manifold: the minimal positive symplectic area of a disc with boundary on $L$. They also showed that this quantity is bounded from above by $π/n$ for a Lagrangian torus inside the $2n$-dimensional unit disc equipped with the standard symplectic form. A Lagrangian torus for which this upper bound is attained is called extremal. We show that an extremal Lagrangian torus inside the four-dimensional unit disc is contained in the boundary $\partial D^4=S^3$, and is hence …
Given a Lagrangian sphere in a symplectic 4-manifold $(M, ω)$ with $b^+=1$, we find embedded symplectic surfaces intersecting it minimally. When the Kodaira dimension $κ$ of $(M, ω)$ is $-\infty$, this minimal intersection property turns out to be very powerful for both the uniqueness and existence problems of Lagrangian spheres. On the uniqueness side, for a symplectic rational manifold and any class which is not characteristic and ternary, we show that homologous Lagrangian spheres are smoothly isotopic, and when the Euler number is less than 8, we generalize Hind and Evans' Hamiltonian uniq…
We prove two main results: (a) Suppose $L$ is a closed, embedded, exact special Lagrangian $m$-fold in ${\mathbb C}^m$ for $m\ge 3$ asymptotic at infinity to the union $Π_1\cupΠ_2$ of two transverse special Lagrangian planes $Π_1,Π_2$ in ${\mathbb C}^m$. Then $L$ is one of the explicit 'Lawlor neck' family of examples found by Lawlor (Invent. math. 95, 1989). (b) Suppose $L$ is a closed, embedded, exact Lagrangian mean curvature flow expander in ${\mathbb C}^m$ for $m\ge 3$ asymptotic at infinity to the union $Π_1\cupΠ_2$ of two transverse Lagrangian planes $Π_1,Π_2$ in ${\mathbb C}^m$. Then $…
We study the following quantitative phenomenon in symplectic topology: In many situations, if a Lagrangian cobordism is sufficiently small (in a sense specified below) then its topology is to a large extend determined by its boundary. This principle allows us to derive several homological uniqueness results for small Lagrangian cobordisms. In particular, under the smallness assumption, we prove homological uniqueness of the class of Lagrangian cobordisms which, by Biran-Cornea's Lagrangian cobordism theory, induces operations on a version of the derived Fukaya category. We also establish a lin…
Generalized Thomas-Yau Uniqueness Theorems
本研究从特殊拉格朗日量强结论、纳入Kähler-Einstein流形极小拉格朗日量及Lotay-Pacini的J-极小拉格朗日量两方面推广Thomas-Yau唯一性定理，采用Imagi等人的方法构造哈密顿扰动完成证明。
We establish the uniqueness up to Hamiltonian isotopy of the Lagrangian spheres in some four dimensional Stein manifolds.
Uniqueness of holomorphic quilts lifted from holomorphic bigons on surfaces
本文证明了从拉格朗日 Floer 链群双边形提升的全纯被子的唯一性，并据此给出闭曲面上浸入拉格朗日 Floer 链群边界映射的组合计算方法，构造了展示数字 8 气泡现象的例子，证实了 Cazassus–Herald–Kirk–Kotelskiy 猜想。
Uniqueness in the local Donaldson-Scaduto conjecture
本文针对局部 Donaldson-Scaduto 猜想，在 $A_2$ 型 ALE 超 Kähler 四维流形与 $\mathbb{R}^2$ 的乘积 Calabi-Yau 三维流形中，证明了具有三个渐近柱状端的特殊拉格朗日对裤的唯一性。
A Multidimensional Birkhoff Theorem for some $C^0$ Lagrangians
本文证明了一类新的$C^0$拉格朗日子集的多维Birkhoff定理，推广了环面扭转映射的经典结果，并首次将其扩展到仅连续对象，结合Floer理论、变分解和弱KAM理论。
In this paper, we prove that if a continuous Hamiltonian flow fixes the points in an open subset $U$ of a symplectic manifold $(M,ω)$, then its associated Hamiltonian is constant at each moment on $U$. As a corollary, we prove that the Hamiltonian of compactly supported continuous Hamiltonian flows is unique both on a compact $M$ with smooth boundary $\del M$ and on a non-compact manifold bounded at infinity. An essential tool for the proof of the locality is the Lagrangian intersection theorem for the conormals of open subsets proven by Kasturirangan and the author, combined with Viterbo's sc…
On the topology of Lagrangian fillings of the standard Legendrian sphere
本文研究了标准切触球中标准Legendrian球面Lagrangian填充的唯一性，证明了确切Maslov零Lagrangian填充为同调球，且实Lagrangian填充在特定维度下与球同胚。
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