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arXiv · 2610.22969

Ricci pinching on complete Kähler manifolds with nonnegative bisectional curvature

Hanzhang Yin
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Abstract

We prove that a connected complete Kähler manifold of complex dimension at least two with nonnegative holomorphic bisectional curvature and uniformly pinched Ricci curvature is compact or flat. This removes the Euclidean volume growth assumption from the flatness theorem of Liu and Ni \cite{LiuNi} for uniform Ricci pinching. We first construct a Lipschitz plurisubharmonic function with finite total Monge--Ampère mass by solving a global Bellman equation. Weighted estimates for a holomorphic canonical section then give a finite top Ricci integral. Ricci pinching implies that the Ricci form belongs to $L^n$, and its Hodge heat evolution has zero top integral by a Stokes argument and scalar heat decay. \par\noindent\textit{Keywords.} Kähler manifolds, Ricci pinching, nonnegative bisectional curvature, Bellman equations, Monge--Ampère mass.

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Hanzhang Yin. 2026-10-16. Ricci pinching on complete Kähler manifolds with nonnegative bisectional curvature. https://arxiv.org/abs/2610.22969

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