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arXiv math/0311323math.AT
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无序构形空间的上同调代数

The cohomology algebra of unordered configuration spaces

Yves Felix, Daniel Tanré

摘要:

给定一个$N$维紧致流形$M$和一个域$\bk$,F. Cohen和L. Taylor构造了一个谱序列$\cE(M,n,\bk)$,它收敛于$M$中$n$点的有序构形空间的上同调.对称群$Σ_n$作用在这个谱序列上,给出了$Σ_n$微分分次交换代数的谱序列。在这里,我们提供了一个明确的描述的不变量代数$(E_1,d_1)^{Σ_n}$的第一项的$\cE(M,n,\Q)$。我们在两个方向上应用这一确定:--在复射影流形或奇维流形$M$的情况下,我们得到了$M$中$n$点的无序构形空间的上同调代数$H^*(C_n(M);\Q)$(详细给出了$P^2(\C)$的具体例子),证明了由$Σ_n$ -不变量$\cE(M,n,\Q)^{Σ_n}$构成的谱序列在2级的退化,对于任何流形$M$。这些结果使用了一个转移映射,也是真实的有限域$\F_p$与$p>n$的系数。

英文摘要:

Given an $N$-dimensional compact manifold $M$ and a field $\bk$, F. Cohen and L. Taylor have constructed a spectral sequence, $\cE(M,n,\bk)$, converging to the cohomology of the space of ordered configurations of $n$ points in $M$. The symmetric group $Σ_n$ acts on this spectral sequence giving a spectral sequence of $Σ_n$ differential graded commutative algebras. Here, we provide an explicit description of the invariants algebra $(E_1,d_1)^{Σ_n}$ of the first term of $\cE(M,n,\Q)$. We apply this determination in two directions: -- in the case of a complex projective manifold or of an odd dimensional manifold $M$, we obtain the cohomology algebra $H^*(C_n(M);\Q)$ of the space of unordered configurations of $n$ points in $M$ (the concrete example of $P^2(\C)$ is detailed), -- we prove the degeneration of the spectral sequence formed of the $Σ_n$-invariants $\cE(M,n,\Q)^{Σ_n}$ at level 2, for any manifold $M$. These results use a transfer map and are also true with coefficients in a finite field $\F_p$ with $p>n$.

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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