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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2404.10145 |
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Table of Contents:
- We study the rigidity problems for open (complete and noncompact) $n$-manifolds with nonnegative Ricci curvature. We prove that if an asymptotic cone of $M$ properly contains a Euclidean $\mathbb{R}^{k-1}$, then the first Betti number of $M$ is at most $n-k$; moreover, if equality holds, then $M$ is flat. Next, we study the geometry of the orbit $Γ\tilde{p}$, where $Γ=π_1(M,p)$ acts on the universal cover $(\widetilde{M},\tilde{p})$. Under a similar asymptotic condition, we prove a geometric rigidity in terms of the growth order of $Γ\tilde{p}$. We also give the first example of a manifold $M$ of $\mathrm{Ric}>0$ and $π_1(M)=\mathbb{Z}$ but with a varying orbit growth order.