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arXiv 2104.07936math.DGmath-phmath.MP
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许多有限维提升丛格是挠的

Many finite-dimensional lifting bundle gerbes are torsion

David Michael Roberts

摘要:

许多在实践中构建的束格伯要么是无限维的,要么是有限维的,但使用远不是纤维束的浸没来构建。Murray和Stevenson证明了单连通流形上的格贝,由有限维纤维丛与连通纤维构成,总是有一个挠$DD$类。在这份说明中,我证明了一个类似的结果,一个广泛的一类gerbes建立从主丛,放宽要求的基本群的基础和连接组件的纤维,允许两者都是非平凡的。这对基本格贝斯的可能模型、有限维李群交叉模的分类、主2-丛上高规范理论的系数李-2-代数以及拓扑$K$ -理论的有限维扭曲都有影响。

英文摘要:

Many bundle gerbes constructed in practice are either infinite-dimensional, or finite-dimensional but built using submersions that are far from being fibre bundles. Murray and Stevenson proved that gerbes on simply-connected manifolds, built from finite-dimensional fibre bundles with connected fibres, always have a torsion $DD$-class. In this note I prove an analogous result for a wide class of gerbes built from principal bundles, relaxing the requirements on the fundamental group of the base and the connected components of the fibre, allowing both to be nontrivial. This has consequences for possible models for basic gerbes, the classification of crossed modules of finite-dimensional Lie groups, the coefficient Lie-2-algebras for higher gauge theory on principal 2-bundles, and finite-dimensional twists of topological $K$-theory.

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