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arXiv math/0312143math.DGmath.AG
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Kähler流形与负$δ$ -捏流形的基本群

Kähler manifolds and fundamental groups of negatively $δ$-pinched manifolds

Juergen Jost, Yihu Yang

摘要:

具有$δ$ -pinched负曲率的黎曼流形的基本群$δ>1/4$不可能是拟紧Kähler流形的基本群。证明还表明,$F_{4(-20)}$中的非均匀格不能是拟紧Kähler流形的基本群。我们还构造了Gromov-Thurston精神的例子来证明我们的结果是以前已知结果的非平凡推广,即在实双曲空间中至少3维的非均匀格不能是拟紧Kähler流形的基本群。

英文摘要:

The fundamental group of a Riemannian manifold with $δ$-pinched negative curvature, $δ>1/4$, cannot be the fundamental group of a quasicompact Kähler manifold. The proof also implies that a non-uniform lattice in $F_{4(-20)}$ cannot be the fundamental group of a quasicompact Kähler manifold. We also construct examples in the spirit of Gromov-Thurston to show that our result is a non-trivial extension of the previously known result that a non-uniform lattice in real hyperbolic space in dimension at least 3 cannot be the fundamental group of a quasicompact Kähler manifold.

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