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arXiv 1612.04871math.GTmath.AT
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负曲率下的同调与同伦复杂性

Homology and homotopy complexity in negative curvature

Uri Bader, Tsachik Gelander, Roman Sauer

摘要:

线性上界的大小提供了有限体积的负弯曲流形的扭转同调在所有维度$d\ne 3$。这扩展了Gromov的一个经典定理。在$3$维中,与贝蒂数相反,挠同调的大小在体积方面是无界的。此外,在Benjamini-Schramm拓扑中,存在一列$3$维双曲流形收敛于$\mathbb{H}^3$,而在$[0,\infty]$中其第一同调的正规化挠率是稠密的.在维数$d\geq 4$中给出了有限体积的负曲流形的个数的精确估计,直到同伦,在维数$d\ge 5$中直到同胚.这些结果是基于一个有效的单纯的厚薄分解,这是独立的利益。

英文摘要:

Linear upper bounds are provided for the size of the torsion homology of negatively curved manifolds of finite volume in all dimensions $d\ne 3$. This extends a classical theorem by Gromov. In dimension $3$, as opposed to the Betti numbers, the size of torsion homology is unbounded in terms of the volume. Moreover, there is a sequence of $3$-dimensional hyperbolic manifolds that converges to $\mathbb{H}^3$ in the Benjamini--Schramm topology while its normalized torsion in the first homology is dense in $[0,\infty]$. In dimension $d\geq 4$ a somewhat precise estimate is given for the number of negatively curved manifolds of finite volume, up to homotopy, and in dimension $d\ge 5$ up to homeomorphism. These results are based on an effective simplicial thick-thin decomposition which is of independent interest.

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