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arXiv 0911.0372math.DGmath.SG
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加权子流形空间的几何结构

Geometric Structures on Spaces of Weighted Submanifolds

Brian Lee

摘要:

在本文中,我们使用一个基于流形的局部建模的“方便”向量空间的几何框架来研究一些无限维空间的几何。给定一个有限维辛流形$(M,ω)$,我们在$M$中的紧致定向迷向子流形空间的叶化的每个叶${\textbf I}_{w}$上构造了一个弱辛结构,该空间具有全测度为1的顶度形式.这些形式被称为加权和这样的流形被称为加权。我们证明了由加权拉格朗日子流形组成的特殊叶上的这种辛结构等价于Weinstein [Adv.Math.82(1990),133-159]的启发式弱辛结构.当权重为正时,这些辛空间辛同构于Donaldson [Asian J. Math.3(1999),1-15]的弱辛结构在固定紧定向流形嵌入到$M$中的空间上的约化。当$M$是紧的时,通过推广Weinstein的矩映射,我们构造了由正的加权迷向子流形组成的每个叶${\textbf I}_{w}$到$M$的Hamilton辛同胚群的余伴随轨道上的辛同胚,该群具有Kirillov-Kostant-Souriau辛结构.在定义了Poisson代数和Poisson流形的概念之后,我们证明了每个空间${\textbf I}_{w}$也可以被Poisson结构的辛叶所识别.最后,我们讨论了加权子流形空间的运动学描述。

英文摘要:

In this paper we use a diffeo-geometric framework based on manifolds that are locally modeled on "convenient" vector spaces to study the geometry of some infinite dimensional spaces. Given a finite dimensional symplectic manifold $(M,ω)$, we construct a weak symplectic structure on each leaf ${\textbf I}_{w}$ of a foliation of the space of compact oriented isotropic submanifolds in $M$ equipped with top degree forms of total measure 1. These forms are called weightings and such manifolds are said to be weighted. We show that this symplectic structure on the particular leaves consisting of weighted Lagrangian submanifolds is equivalent to a heuristic weak symplectic structure of Weinstein [Adv. Math. 82 (1990), 133-159]. When the weightings are positive, these symplectic spaces are symplectomorphic to reductions of a weak symplectic structure of Donaldson [Asian J. Math. 3 (1999), 1-15] on the space of embeddings of a fixed compact oriented manifold into $M$. When $M$ is compact, by generalizing a moment map of Weinstein we construct a symplectomorphism of each leaf ${\textbf I}_{w}$ consisting of positive weighted isotropic submanifolds onto a coadjoint orbit of the group of Hamiltonian symplectomorphisms of $M$ equipped with the Kirillov-Kostant-Souriau symplectic structure. After defining notions of Poisson algebras and Poisson manifolds, we prove that each space ${\textbf I}_{w}$ can also be identified with a symplectic leaf of a Poisson structure. Finally, we discuss a kinematic description of spaces of weighted submanifolds.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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