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arXiv · 2609.40040

Matsumura's extension problem for pluricanonical forms in Kähler families I: the smooth and essentially Moishezon cases

Jian Chen·Sheng Rao·Kai Wang
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Abstract

In this paper, we study a problem posed by Matsumura on the extension of pluricanonical forms in Kähler families with a relatively nef canonical bundle. We give an affirmative answer in the smooth case, and for one-parameter degenerations under the additional assumption that the relative canonical bundle restricts to a big line bundle on an irreducible component of the central fiber. In particular, we confirm Siu's conjecture on the invariance of plurigenera for a smooth Kähler family with one fiber admitting the nef canonical bundle. The key step in the smooth case is to construct a semipositively curved singular metric on the relative canonical bundle with the integrability required for Cao's $L^2$ extension theorem, using Păun's twisted form of Schumacher's curvature formula and a uniform Monge--Ampère estimate obtained by adapting the capacity method of Boucksom--Eyssidieux--Guedj--Zeriahi. For one-parameter degenerations, we propagate bigness from an irreducible component of the central fiber to nearby smooth fibers and then apply Matsumura's relative Kawamata--Viehweg vanishing theorem on a projective modification to obtain the desired extension.

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Jian Chen, Sheng Rao, Kai Wang. 2026-09-30. Matsumura's extension problem for pluricanonical forms in Kähler families I: the smooth and essentially Moishezon cases. https://arxiv.org/abs/2609.40040

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