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Scalar-mean rigidity theorem for compact manifolds with boundary

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arxiv 2409.14503 v5 pith:MWQBI6SI submitted 2024-09-22 math.DG

Scalar-mean rigidity theorem for compact manifolds with boundary

classification math.DG
keywords rigiditytheoremcurvaturedimensionprovescalar-meanargumentboundary
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We prove a scalar-mean rigidity theorem for compact Riemannian manifolds with boundary in dimension less than five by developing a dimension reduction argument for mean curvature, which extends Schoen-Yau's dimension reduction argument for scalar curvature. As a corollary, we prove the sharp spherical radius rigidity theorem and best NNSC fill-in in terms of the mean curvature. Moreover, we prove a Lipschitz Listing type scalar-mean rigidity theorem for these dimensions.

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