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arXiv 0901.1330math.GT
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双曲三维流形中的小曲率层

Small curvature laminations in hyperbolic 3-manifolds

William Breslin

摘要:

我们证明了:如果$\mathcal{L}$是有限体积双曲三维流形中的余维1层,使得对于固定的$δ\in[0,1)$,$\mathcal{L}$的每个叶的主曲率都在区间$(-δ,δ)$内,且$\mathcal{L}$的互补区域都不是曲面上的区间丛,则$\mathcal{L}$的每个边界叶都有非平凡的基本群.我们还证明了固定常数$δ_0 > 0$的存在性,使得如果$\mathcal{L}$是有限体积双曲三维流形中的余维1层,使得$\mathcal{L}$的每个叶的主曲率都在区间$(-δ_0 ,δ_0)$中,并且$\mathcal{L}$的任何互补区域都不是曲面上的区间丛,则$\mathcal{L}$的每个边界叶都有非循环基本群.

英文摘要:

We show that if $\mathcal{L}$ is a codimension-one lamination in a finite volume hyperbolic 3-manifold such that the principal curvatures of each leaf of $\mathcal{L}$ are all in the interval $(-δ,δ)$ for a fixed $δ\in[0,1)$ and no complimentary region of $\mathcal{L}$ is an interval bundle over a surface, then each boundary leaf of $\mathcal{L}$ has a nontrivial fundamental group. We also prove existence of a fixed constant $δ_0 > 0$ such that if $\mathcal{L}$ is a codimension-one lamination in a finite volume hyperbolic 3-manifold such that the principal curvatures of each leaf of $\mathcal{L}$ are all in the interval $(-δ_0 ,δ_0)$ and no complimentary region of $\mathcal{L}$ is an interval bundle over a surface, then each boundary leaf of $\mathcal{L}$ has a noncyclic fundamental group.

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