非球面流形的顺从覆盖、体积与L2-贝蒂数
Amenable covers, volume and L2-Betti numbers of aspherical manifolds
摘要：
我们提供了一个证明之间的不平等的体积和L2-贝蒂数的非球面流形格罗莫夫概述了一个战略的基础上的一般思想的Connes。该策略的实现涉及到测量等价关系，R-单纯复形的Gaboriau的L2-贝蒂数理论，以及可测群论的其他主题。进一步证明了L2-贝蒂数的消灭定理，推广了Cheeger和Gromov的一个经典结果.作为推论之一，我们得到了一个间隙定理，当非球面流形的极小体积足够小时，该定理意味着非球面流形的L2-贝蒂数为零。
英文摘要：
We provide a proof for an inequality between volume and L2-Betti numbers of aspherical manifolds for which Gromov outlined a strategy based on general ideas of Connes. The implementation of that strategy involves measured equivalence relations, Gaboriau's theory of L2-Betti numbers of R-simplicial complexes, and other themes of measurable group theory. Further, we prove new vanishing theorems for L2-Betti numbers that generalize a classical result of Cheeger and Gromov. As one of the corollaries, we obtain a gap theorem which implies vanishing of L2-Betti numbers of an aspherical manifold when its minimal volume is sufficiently small.
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