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arXiv 1807.07293math.ATmath.GTmath.KT
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广义位形空间的上同调

Cohomology of generalized configuration spaces

Dan Petersen

摘要:

设$X$是一个拓扑空间。考虑$X$上点的某些广义位形空间,这些位形空间是由消去对角线的某些交点后的笛卡儿积$X^n$得到的.我们给出了一个系统的框架,研究这种空间的上同调使用我们所谓的“tcdga模型”的上链$X$。证明了如下定理:设$X$是一个“nice”拓扑空间,$R$是任意交换环,$H^\bullet_c(X,R)\to H^\bullet(X,R)$是零映射,$H^\bullet_c(X,R)$是一个投射$R$ -模.则$X$上任意点的广义位形空间的紧支撑上同调只依赖于分次$R$ -模$H^\bullet_c(X,R)$ .这推广了Arabia的一个定理。

英文摘要:

Let $X$ be a topological space. We consider certain generalized configuration spaces of points on $X$, obtained from the cartesian product $X^n$ by removing some intersections of diagonals. We give a systematic framework for studying the cohomology of such spaces using what we call "tcdga models" for the cochains on $X$. We prove the following theorem: suppose that $X$ is a "nice" topological space, $R$ is any commutative ring, $H^\bullet_c(X,R)\to H^\bullet(X,R)$ is the zero map, and that $H^\bullet_c(X,R)$ is a projective $R$-module. Then the compact support cohomology of any generalized configuration space of points on $X$ depends only on the graded $R$-module $H^\bullet_c(X,R)$. This generalizes a theorem of Arabia.

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