arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1812.03072math.AT
收藏

交同调的Poincaré对偶的变形

Variations on Poincaré duality for intersection homology

Martintxo Saralegi-Aranguren, Daniel Tanré

摘要:

与域中系数的交同调恢复了某些具有奇异性的空间的庞加莱对偶,如伪流形。但是,对于环中的系数,流形和伪流形的行为是不同的。这项工作是一个概述,证明和明确的例子,各种可能的情况下,其性质。我们首先建立了一个对偶,定义从一个卡积,两个相交的上同调:第一个产生于一个线性对偶和第二个从一个单纯爆破。此外,从这个性质来看,交同调中的Poincaré对偶看起来像是一个有边界带边流形的Poincaré-Lefschetz对偶。此外,对前两个上同调的重合性的研究表明,庞加莱对偶存在的唯一障碍是一个定义良好的复形的同调。这恢复了Goresky和Siegel为紧PL-伪流形引入的外围层的情况。我们还列出了一系列的周边交上同调的显式计算。特别是,我们观察到,庞加莱对偶可以存在于扭转的存在下,在“临界程度”的交叉同源的链接的伪流形。

英文摘要:

Intersection homology with coefficients in a field restores Poincaré duality for some spaces with singularities, as pseudomanifolds. But, with coefficients in a ring, the behaviours of manifolds and pseudomanifolds are different. This work is an overview, with proofs and explicit examples, of various possible situations with their properties. We first set up a duality, defined from a cap product, between two intersection cohomologies: the first one arises from a linear dual and the second one from a simplicial blow up. Moreover, from this property, Poincaré duality in intersection homology looks like the Poincaré-Lefschetz duality of a manifold with boundary. Besides that, an investigation of the coincidence of the two previous cohomologies reveals that the only obstruction to the existence of a Poincaré duality is the homology of a well defined complex. This recovers the case of the peripheral sheaf introduced by Goresky and Siegel for compact PL-pseudomanifolds. We also list a series of explicit computations of peripheral intersection cohomology. In particular, we observe that Poincaré duality can exist in the presence of torsion in the "critical degree" of the intersection homology of the links of a pseudomanifold.

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。

↑