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Nonnegative Ricci curvature, splitting at infinity, and first Betti number rigidity

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Jiayin Pan, Zhu Ye

Differential Geometry · Submitted 15 Apr 2024

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim 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.

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arXiv ID2404.10145 (version 1)
Pith IDHFBWRIMB, Pith's permanent record of this paper and its review
CitationJiayin Pan, Zhu Ye. "Nonnegative Ricci curvature, splitting at infinity, and first Betti number rigidity." arXiv:2404.10145 (2024). https://pith.science/paper/HFBWRIMB
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The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.

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Compiled by classifier-1.13.0 via TypeSafe API, question bank abstract-p1-20260923, 2026-09-23: 1 request, 4,460 input tokens.

What the abstract itself states, as probabilities: claims first 0.77 · states limitation 0.21 · human participants 0.01 · controlled comparison 0.03 · randomized assignment 0.01 · states quantitative result 0.94 · compares with prior results 0.17 · mentions code or data availability 0.02.

The abstract, sentence by sentence

arXiv listing abstract v1. Results and the main claim are underlined; .

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 $\Gamma\tilde{p}$, where $\Gamma=\pi_1(M,p)$ 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 $\Gamma\tilde{p}$. We also give the first example of a manifold $M$ of $\mathrm{Ric}>0$ and $\pi_1(M)=\mathbb{Z}$ but with a varying orbit growth order.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#sentencerolethe authors' own workstates the main conclusionstrength
s0 We study the rigidity problems for open (complete and noncompact) $n$-manifolds with nonnegative Ricci curvature. background 0.56 0.76 0.04 asserted 0.63
s1 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. result 1.00 0.95 0.65 asserted 1.00
s2 Next, we study the geometry of the orbit $\Gamma\tilde{p}$, where $\Gamma=\pi_1(M,p)$ acts on the universal cover $(\widetilde{M},\tilde{p})$. contribution 0.97 0.87 0.03 asserted 0.61
s3 Under a similar asymptotic condition, we prove a geometric rigidity in terms of the growth order of $\Gamma\tilde{p}$. result 0.86 0.94 0.11 asserted 1.00
s4 We also give the first example of a manifold $M$ of $\mathrm{Ric}>0$ and $\pi_1(M)=\mathbb{Z}$ but with a varying orbit growth order. result 0.82 0.95 0.07 asserted 1.00

What kind of paper the classifier reports this is: theoretical result 1.00 · evidence from proof or derivation 1.00.

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  • references and citing sentences
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  • P abstract
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  • S sections
  • T body sentences
  • C citations
  • R cross-paper relations

Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

The paper
Original abstract

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 $\Gamma\tilde{p}$, where $\Gamma=\pi_1(M,p)$ 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 $\Gamma\tilde{p}$. We also give the first example of a manifold $M$ of $\mathrm{Ric}>0$ and $\pi_1(M)=\mathbb{Z}$ but with a varying orbit growth order.

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