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arXiv 0705.3114math.SGmath.GT
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辛群作用与Covering Spaces

Symplectic Group Actions and Covering Spaces

James Montaldi, Juan-Pablo Ortega

摘要:

对于非哈密顿的辛群作用,有两种方法定义约化。首先利用柱值动量映射,然后将作用量提升到任意哈密顿覆盖(如泛覆盖),然后按通常的方法进行辛约化。我们表明,提供的行动是自由的和适当的,并与行动的Hamilton holonomy是封闭的,从后者到前者的自然投影是一个辛覆盖。同时给出了给定辛群作用的所有Hamilton覆盖的分类。研究了群作用到覆盖的提升的主要性质。

英文摘要:

For symplectic group actions which are not Hamiltonian there are two ways to define reduction. Firstly using the cylinder-valued momentum map and secondly lifting the action to any Hamiltonian cover (such as the universal cover), and then performing symplectic reduction in the usual way. We show that provided the action is free and proper, and the Hamiltonian holonomy associated to the action is closed, the natural projection from the latter to the former is a symplectic cover. At the same time we give a classification of all Hamiltonian covers of a given symplectic group action. The main properties of the lifting of a group action to a cover are studied.

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