Lagrangian unknottedness in Stein surfaces

Lagrangian unknottedness in Stein surfaces
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斯坦因表面的拉格朗日无结性

DOI:
10.4310/ajm.2012.v16.n1.a1
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发表时间:
2012
影响因子:
0.6
通讯作者:
R. Hind
R. Hind
中科院分区:
数学4区
文献类型:
--
作者:
R. Hind

文献摘要

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相似文献

我们证明了2-球面余切丛内的拉格朗日球面空间,具有典型的辛结构,是可收缩的。然后,我们讨论的现象拉格朗日unknotedness在其他斯坦曲面。存在同伦拉格朗日领域,这不是哈密顿同位素,但我们表明,在一个典型的情况下,所有这些领域仍然是等价的辛同胚。
We show that the space of Lagrangian spheres inside the cotangent bundle of the 2-sphere, with its canonical symplectic structure, is contractible. We then discuss the phenomenon of Lagrangian unknottedness in other Stein surfaces. There exist homotopic Lagrangian spheres which are not Hamiltonian isotopic, but we show that in a typical case all such spheres are still equivalent under a symplectomorphism.