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Rigidity of four-dimensional K\"ahler-Ricci solitons

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arxiv 2212.05267 v1 pith:BITE25VS submitted 2022-12-10 math.DG

classification math.DG
keywords ahlerahler-ricciclosefour-dimensionalgradientmathbbriccirigidity
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abstract

In this article, we investigate four-dimensional gradient shrinking Ricci solitons close to a K\"ahler model. The first theorem could be considered as a rigidity result for the K\"ahler-Ricci soliton structure on $\mathbb{S}^2\times \mathbb{R}^2$ (in the sense of Remark 1). Moreover, we show that if the quotient of norm of the self-dual Weyl tensor and scalar curvature is close to that on a K\"ahler metric in a specific sense, then the gradient Ricci soliton must be either half-conformally flat or locally K\"ahler.

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  1. Gradient Shrinking Ricci Solitons and Modified Sectional Curvature

    math.DG 2025-09 conditional novelty 6.0 of 10

    Under sharp pinching conditions on the self-dual Weyl tensor, scalar curvature, and modified sectional curvature, four-dimensional gradient shrinking Ricci solitons are forced to be locally Kähler, isometric to S^4 or...

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