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arXiv 2203.03414math.AT
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奇数维流形微分同胚的一些有理同调计算

Some rational homology computations for diffeomorphisms of odd-dimensional manifolds

Johannes Ebert, Jens Reinhold

AI总结:

本文计算了奇数维流形$U_{g,1}^n$微分同胚群分类空间的有理上同调,证明其为Miller--Morita--Mumford类上的自由分次交换代数,并通过经典三步法完成证明。

摘要:

对于较大的g和n,我们计算了流形$U_{g,1}^n:= \\#^g(S^n \times S^{n+1})\setminus \mathrm{int}{D^{2n+1}}$的微分同胚群的分类空间的有理上同调,直到大约n度。结果表明,它是在适当的Miller--Morita--Mumford类集合上的自由分次交换代数。我们的证明通过经典的三步过程:(a)计算同伦自同构的上同调,(b)使用surgery将其与块微分同胚进行比较,(c)使用伪同痕理论和代数K-理论来处理实际的微分同胚群。

英文摘要:

We calculate the rational cohomology of the classifying space of the diffeomorphism group of the manifolds $U_{g,1}^n:= \#^g(S^n \times S^{n+1})\setminus \mathrm{int}{D^{2n+1}}$, for large $g$ and $n$, up to approximately degree $n$. The answer is that it is a free graded commutative algebra on an appropriate set of Miller--Morita--Mumford classes. Our proof goes through the classical three-step procedure: (a) compute the cohomology of the homotopy automorphisms, (b) use surgery to compare this to block diffeomorphisms, (c) use pseudoisotopy theory and algebraic $K$-theory to get at actual diffeomorphism groups.

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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