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arXiv 1202.3077math.SGmath.AG
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关于非阿贝尔辛割

On Non-Abelian Symplectic Cutting

Johan Martens, Michael Thaddeus

摘要:

讨论了非阿贝尔紧群的Hamilton作用的辛割。通过使用退化的Vinberg幺半群的基础上,我们给,在良好的情况下,一个全球性的商描述的手术建设介绍伍德沃德和Meinrenken,并显示它可以解释在代数几何术语。一个关键的成分是“普遍削减”的余切丛的组本身,这是确定与模空间的框架束链的投影线最近推出的作者。

英文摘要:

We discuss symplectic cutting for Hamiltonian actions of non-Abelian compact groups. By using a degeneration based on the Vinberg monoid we give, in good cases, a global quotient description of a surgery construction introduced by Woodward and Meinrenken, and show it can be interpreted in algebro-geometric terms. A key ingredient is the `universal cut' of the cotangent bundle of the group itself, which is identified with a moduli space of framed bundles on chains of projective lines recently introduced by the authors.

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