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arXiv 1004.2286math.SGmath.AT
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Ph. D.论文:平坦G-丛的模空间的预量子化

Ph. D. Thesis: Pre-quantization of the moduli space of flat G-bundles

Derek Krepski

摘要:

本文从上同调的角度研究拟哈密顿群作用量的预量子化。建立了预量子化与辛约化的相容性和融合积,并利用它们研究了闭曲面$Σ$上平坦$G$ -丛的模空间-$M_G(Σ)$预量子化的充分条件.对于单连通的紧致单李群$G$,已知$M_G(Σ)$在整数水平上是可预量化的。然而,对于非单连通$G$,层次的完整性不足以进行预量化,本文确定了障碍-即$H^3(G\times G;\Z)$中的某个上同调类-对底层层次施加了进一步的限制。允许预量化的模空间的水平被明确地确定为所有非单连通的,紧凑的,单李群$G$。部分结果的情况下,表面$Σ$与标记点。此外,它表明,通过双射之间的对应准哈密顿群作用和哈密顿圈群作用,相应的预量子化的概念是一致的。

英文摘要:

This thesis studies the pre-quantization of quasi-Hamiltonian group actions from a cohomological viewpoint. The compatibility of pre-quantization with symplectic reduction and the fusion product are established, and are used to understand the sufficient conditions for the pre-quantization of $M_G(Σ)$, the moduli space of flat $G$-bundles over a closed surface $Σ$. For a simply connected, compact, simple Lie group $G$, $M_G(Σ)$ is known to be pre-quantizable at integer levels. For non-simply connected $G$, however, integrality of the level is not sufficient for pre-quantization, and this thesis determines the obstruction---namely a certain cohomology class in $H^3(G\times G;\Z)$---that places further restrictions on the underlying level. The levels that admit a pre-quantization of the moduli space are determined explicitly for all non-simply connected, compact, simple Lie groups $G$. Partial results are obtained for the case of a surface $Σ$ with marked points. Also, it is shown that via the bijective correspondence between quasi-Hamiltonian group actions and Hamiltonian loop group actions, the corresponding notions of pre-quantization coincide.

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