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北美退伍军人节(Veterans Day),12 日无更新
arXiv 1005.4243math.DGhep-th
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泛弦类与等变上同调

Universal string classes and equivariant cohomology

Raymond F. Vozzo

摘要:

给出了$LG$ -丛的分类理论,其中$LG$是紧李群$G$的环群,并给出了泛$LG$ -丛的弦类的计算.我们证明了这个类实际上是一个等变上同调类,并给出了表示它的一个等变微分形式,然后利用Caloron对应定义了$LG$ -丛的(高级)特征类,并证明了自由环群的一个类似结果Murray-Vozzo(J. Geom. Phys.,60(9),2010)。这些类有一个自然的解释,在等变上同调,我们给等变微分形式代表的普遍情况下,在所有奇数维。

英文摘要:

We give a classifying theory for $LG$-bundles, where $LG$ is the loop group of a compact Lie group $G$, and present a calculation for the string class of the universal $LG$-bundle. We show that this class is in fact an equivariant cohomology class and give an equivariant differential form representing it. We then use the caloron correspondence to define (higher) characteristic classes for $LG$-bundles and to prove for the free loop group an analogue of the result for characteristic classes for based loop groups in Murray-Vozzo (J. Geom. Phys., 60(9), 2010). These classes have a natural interpretation in equivariant cohomology and we give equivariant differential form representatives for the universal case in all odd dimensions.

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