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arXiv math/0408228math.DG
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无穷连通和、K-面积与正数量曲率

Infinite connected sums, K-area and positive scalar curvature

Levi Lopes de Lima

摘要:

怀特利用狄拉克算子的指数理论和布洛克-韦伯格一致有限同调证明了某些无限连通和在其有界几何类中不具有非负数量曲率的度量。他的证明使用了一个粗糙版本的$\hat{A}$类来阻碍这种度量。在这份说明中,我们证明了一个版本的怀特的结果,其中的一个变种的概念,无限$K$ -面积,最初是由于格罗莫夫,是用来阻碍度量与积极的数量曲率。

英文摘要:

Whyte used the index theory of Dirac operators and Block-Weiberger uniformly finite homology to show that certain infinite connected sums do not carry a metric with nonnegative scalar curvature in their bounded geometry class. His proof uses a coarse version of the $\hat{A}$-class to obstruct such metrics. In this note we prove a version of Whyte's result where a variant of the notion of infinite $K$-area, originally due to Gromov, is used to obstruct metrics with positive scalar curvature.

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