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arXiv 1907.04777math.AT
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齐性空间的上同调环

The cohomology rings of homogeneous spaces

Matthias Franz

摘要:

设$G$是紧连通李群,$K$是闭连通子群.设$G$和$K$的积分上同调中任意挠元的阶在给定的主理想整环$k$中是可逆的.已知在这种情况下,系数在$k$中的齐次空间$G/K$的上同调与$H^{*}(BK)$和$H^{*}(BG)$上的$k$的挠积同构为$k$ -模.我们表明,这种同构是乘法和自然的对$(G,K)$提供2是可逆的$k$。证明使用同伦Gerstenhaber代数在一个基本的方式。特别地,我们证明了环面的分类空间上的正规化奇异上链是形式上的同伦Gerstenhaber代数。

英文摘要:

Let $G$ be a compact connected Lie group and $K$ a closed connected subgroup. Assume that the order of any torsion element in the integral cohomology of $G$ and $K$ is invertible in a given principal ideal domain $k$. It is known that in this case the cohomology of the homogeneous space $G/K$ with coefficients in $k$ and the torsion product of $H^{*}(BK)$ and $k$ over $H^{*}(BG)$ are isomorphic as $k$-modules. We show that this isomorphism is multiplicative and natural in the pair $(G,K)$ provided that 2 is invertible in $k$. The proof uses homotopy Gerstenhaber algebras in an essential way. In particular, we show that the normalized singular cochains on the classifying space of a torus are formal as a homotopy Gerstenhaber algebra.

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