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arXiv 0709.1063math.DG
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丛自同构的李群及其扩张

Lie groups of bundle automorphisms and their extensions

Karl-Hermann Neeb

摘要:

本文描述了紧致流形$M$上的主丛的无穷小自同构的李代数$\aut(P)$的自然交换扩张,并讨论了它们对相应李群扩张的可积性.一个平凡的包$P = M \times K$的情况已经很有趣了。在这种情况下,我们表明,基本上所有的规范代数$C^\infty(M,\fk)$的中心扩展可以得到从三个基本类型的上循环与空间$\fz := C^\infty(M,V)$,$Ω^1(M,V)$和$Ω^1(M,V)/\dd C^\infty(M,V)$之一的值。这些上循环扩展到$\aut(P)$,并且,在假设$TM$是平凡的,我们还描述了空间$H^2({\cal V}(M),\fz)$分类这些扩展的扭曲。然后,我们表明,所有的基本类型有自然的推广到非平凡的丛,并解释在何种条件下,他们扩展到$\aut(P)$和集成到全球李群扩展。

英文摘要:

We describe natural abelian extensions of the Lie algebra $\aut(P)$ of infinitesimal automorphisms of a principal bundle over a compact manifold $M$ and discuss their integrability to corresponding Lie group extensions. Already the case of a trivial bundle $P = M \times K$ is quite interesting. In this case, we show that essentially all central extensions of the gauge algebra $C^\infty(M,\fk)$ can be obtained from three fundamental types of cocycles with values in one of the spaces $\fz := C^\infty(M,V)$, $Ω^1(M,V)$ and $Ω^1(M,V)/\dd C^\infty(M,V)$. These cocycles extend to $\aut(P)$, and, under the assumption that $TM$ is trivial, we also describe the space $H^2({\cal V}(M),\fz)$ classifying the twists of these extensions. We then show that all fundamental types have natural generalizations to non-trivial bundles and explain under which conditions they extend to $\aut(P)$ and integrate to global Lie group extensions.

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