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arXiv 1010.4071math.AG
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莫尔斯理论与环面向量丛

Morse theory and toric vector bundles

David Treumann

摘要:

Morelli对复曲面簇X的K-理论的计算将实向量空间上的多面体可构造函数与X上的每个等变向量丛E联系起来。相干-可构造对应将莫雷利的可构造函数提升到可构造层kappa(E)的复形。我们证明了来自莫尔斯理论的kappa(E)的上同调的某些滤子与E的类茎的Klyachko滤子是一致的。我们给出了一个复形的可构造层对应于一个向量丛和一个nef向量丛的Morse理论(即微局部)条件。

英文摘要:

Morelli's computation of the K-theory of a toric variety X associates a polyhedrally constructible function on a real vector space to every equivariant vector bundle E on X. The coherent-constructible correspondence lifts Morelli's constructible function to a complex of constructible sheaves kappa(E). We show that certain filtrations of the cohomology of kappa(E) coming from Morse theory coincide with the Klyachko filtrations of the generic stalk of E. We give Morse-theoretic (i.e. microlocal) conditions for a complex of constructible sheaves to correspond to a vector bundle, and to a nef vector bundle.

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