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Topology of $3$-manifolds with uniformly positive scalar curvature

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arxiv 2212.14383 v3 pith:7PCUPTDG submitted 2022-12-29 math.DG math.GT

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keywords curvaturemanifoldsmathbbpositivescalaruniformlymanifoldsome
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abstract

In this article, we classify (non-compact) $3$-manifolds with uniformly positive scalar curvature. Precisely, we show that an oriented $3$-manifold has a complete metric with uniformly positive scalar curvature if and only if it is homeomorphic to an (possibly) infinite connected sum of spherical $3$-manifolds and some copies of $\mathbb{S}^1\times \mathbb{S}^2$. Further, we study an oriented $3$-manifold with mean convex boundary and with uniformly positive scalar curvature. If the boundary is a disjoint union of closed surfaces, then the manifold is an (possibly) infinite conned sum of spherical $3$-manifolds, some handlebodies and some copies of $\mathbb{S}^1\times \mathbb{S}^2$.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Optimal decay constant for complete manifolds of positive scalar curvature with quadratic decay

    math.DG 2025-08 conditional novelty 8.0 of 10

    An orientable 3-manifold with positive scalar curvature decaying at rate C > 2/3 must be a connected sum of spherical manifolds and S^2 x S^1 pieces, and the threshold 2/3 is optimal.

  2. Positive curvature conditions on contractible manifolds

    math.DG 2025-07 conditional novelty 6.0 of 10

    A complete metric of uniformly positive scalar curvature forces a suitably connected contractible open 5-manifold to be R^5, and positive isotropic curvature or pinched Ricci conditions with convex boundary force comp...

  3. Area-charge inequalities and rigidity of time-symmetric initial data sets

    gr-qc 2025-07 conditional novelty 6.0 of 10

    In charged Einstein-Maxwell initial data sets, a boundary surface must have area at least a sharp function of its electric charge and the cosmological constant, with equality only for product geometries.

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