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On the fundamental group of steady gradient Ricci solitons with nonnegative sectional curvature

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arxiv 2412.07452 v2 pith:MV344UUF submitted 2024-12-10 math.DG

classification math.DG
keywords riccicurvaturefundamentalgradientgroupnonnegativesectionalsoliton
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abstract

In this paper, we study the fundamental group of the complete steady gradient Ricci soliton with nonnegative sectional curvature. We prove that the fundamental group of such a Ricci soliton is either trivial or infinite. As a corollary, we show that an $n$-dimensional complete $\kappa$-noncollapsed steady gradient Ricci soliton with nonnegative sectional curvature must be diffeomorphic to $\mathbb{R}^n$.

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  1. Infinitely many non-collapsed steady Ricci solitons on complex line bundles

    math.DG 2024-12 conditional novelty 7.0 of 10

    For each k at least 3, the complex line bundle O(k) over CP^{2m+1} admits infinitely many non-collapsed steady Ricci solitons, and for 3 ≤ k ≤ 2m+1 it admits an asymptotically conical Ricci-flat metric.

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