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arXiv 1201.4690math.DGmath-phmath.MP
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辛主$\mathbb{R}$ -丛的约化

Reduction of symplectic principal $\mathbb{R}$-bundles

Ignazio Lacirasella, Juan Carlos Marrero, Edith Padrón

摘要:

我们描述了辛主$\mathbb{R}$ -丛在动量映射的存在下的一个约化过程。这类结构在非自治哈密顿系统的几何表述中起着重要的作用。我们应用这个程序的标准辛主$\mathbb{R}$ -丛与纤维化$π:M\to\mathbb{R}$。当$π$是主$G$ -丛并且$G_ν$表示与$G$的李代数的对偶中的元素$ν$相关的各向同性群时,我们使用约化过程来描述商流形$M/G_ν$上的Poisson结构,其辛叶与协伴随轨道$\mathcal{O}_ν$同构。此外,我们还证明了非自治哈密顿系统在辛主$\mathbb{R}$ -丛上的一个约化过程。

英文摘要:

We describe a reduction process for symplectic principal $\mathbb{R}$-bundles in the presence of a momentum map. This type of structures plays an important role in the geometric formulation of non-autonomous Hamiltonian systems. We apply this procedure to the standard symplectic principal $\mathbb{R}$-bundle associated with a fibration $π:M\to\mathbb{R}$. When $π$ is a principal $G$-bundle and $G_ν$ denotes the isotropy group associated with an element $ν$ in the dual to the Lie algebra of $G$, we use the reduction process in order to describe a Poisson structure on the quotient manifold $M/G_ν$ whose symplectic leaves are isomorphic to the coadjoint orbit $\mathcal{O}_ν$ . Moreover, we show a reduction process for non-autonomous Hamiltonian systems on symplectic principal $\mathbb{R}$-bundles.

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