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arXiv 2004.13395math.DGhep-thmath-phmath.ATmath.MP
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丛格贝的光滑2-群扩张与对称性

Smooth 2-Group Extensions and Symmetries of Bundle Gerbes

Severin Bunk, Lukas Müller, Richard J. Szabo

摘要:

本文研究了流形$M$上的丛格,流形上的丛格带有连通李群$G$的作用。我们发现,这些数据产生了一个光滑的2-群扩展的$G$的光滑2-群的厄米线丛$M$。这个2-群扩张分类了丛gerbe上的等变结构,它的非平凡性对等变结构的存在构成了障碍。我们提出了一个新的全球性的方法来并行运输的一个捆绑gerbe与连接,并使用它来给这种光滑的2-群扩展的同伦相干版本的配丛建设的替代建设。我们应用这些结果对量子力学中的非结合磁平移和量子场论中的Faddeev-Mickelsson-Shatashvili反常给出了新的描述。我们还提出了一个定义的光滑弦2群模型在我们的几何框架。从紧单连通李群$G$的一个基本格出发,证明了我们构造的$G$的光滑2-群扩张为$G$的弦群提供了新的模型.

英文摘要:

We study bundle gerbes on manifolds $M$ that carry an action of a connected Lie group $G$. We show that these data give rise to a smooth 2-group extension of $G$ by the smooth 2-group of hermitean line bundles on $M$. This 2-group extension classifies equivariant structures on the bundle gerbe, and its non-triviality poses an obstruction to the existence of equivariant structures. We present a new global approach to the parallel transport of a bundle gerbe with connection, and use it to give an alternative construction of this smooth 2-group extension in terms of a homotopy-coherent version of the associated bundle construction. We apply our results to give new descriptions of nonassociative magnetic translations in quantum mechanics and the Faddeev-Mickelsson-Shatashvili anomaly in quantum field theory. We also propose a definition of smooth string 2-group models within our geometric framework. Starting from a basic gerbe on a compact simply-connected Lie group $G$, we prove that the smooth 2-group extensions of $G$ arising from our construction provide new models for the string group of $G$.

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