On the Hodge Structures of Global Smoothings of Normal Crossing Varieties

Kuan-Wen Chen

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arXiv · 2404.19229

On the Hodge Structures of Global Smoothings of Normal Crossing Varieties

Kuan-Wen Chen

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Abstract

Let $f:X \rightarrow \Delta $ be a one-parameter semistable degeneration of $m$-dimensional compact complex manifolds. Assume that each component of the central fiber $X_0$ is K\"ahler. Then, we provide a criterion for a general fiber to satisfy the $\partial\overline{\partial}$-lemma and a formula to compute the Hodge index on the middle cohomology of the general fiber in terms of the topological conditions/invariants on the central fiber. We apply our theorem to several examples, including the global smoothing of $m$-fold ODPs, Hashimoto-Sano's non-K\"ahler Calabi-Yau threefolds, and Sano's non-K\"ahler Calabi-Yau $m$-folds. To deal with the last example, we also prove a Lefschetz-type theorem for the cohomology of the fiber product of two Lefschetz fibrations over $\mathbb{P}^1$ with disjoint critical locus.

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Kuan-Wen Chen. 2024-04-30. On the Hodge Structures of Global Smoothings of Normal Crossing Varieties. https://arxiv.org/abs/2404.19229

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