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arXiv math/0207169math.DGhep-thmath-phmath.MP
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引力瞬子的Hodge上同调

Hodge cohomology of gravitational instantons

Tamas Hausel, Eugenie Hunsicker, Rafe Mazzeo

摘要:

本文研究完备流形上的L^2调和形式空间,其度量为边界度量或尖点度量。这些度量推广了几种不同的著名度量类在无穷远处的几何结构,包括渐近局部欧几里得流形、(已知类型的)引力瞬子、局部对称空间的Q秩1端点上的庞加莱度量和凯勒流形中光滑因子的补上的庞加莱度量。在所有情况下的答案是在分层紧化的流形的交叉上同调。我们的结果所隐含的L^2签名公式与戴[dai]以及更一般地由Vaillant [Va]证明的公式密切相关,并且直接根据不同Permian的交上同调来确定戴的tau不变量。这项工作也密切相关的Carron [车]和即将到来的文件Cheeger和戴[CD]最近的文件。我们将结果应用到许多例子中,引力瞬子就是其中之一,这些例子是在弦论对偶理论中关于L^2调和形式的预言中出现的。

英文摘要:

We study the space of L^2 harmonic forms on complete manifolds with metrics of fibred boundary or fibred cusp type. These metrics generalize the geometric structures at infinity of several different well-known classes of metrics, including asymptotically locally Euclidean manifolds, the (known types of) gravitational instantons, and also Poincaré metrics on Q-rank 1 ends of locally symmetric spaces and on the complements of smooth divisors in Kähler manifolds. The answer in all cases is given in terms of intersection cohomology of a stratified compactification of the manifold. The L^2 signature formula implied by our result is closely related to the one proved by Dai [dai] and more generally by Vaillant [Va], and identifies Dai's tau invariant directly in terms of intersection cohomology of differing perversities. This work is also closely related to a recent paper of Carron [Car] and the forthcoming paper of Cheeger and Dai [CD]. We apply our results to a number of examples, gravitational instantons among them, arising in predictions about L^2 harmonic forms in duality theories in string theory.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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