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Song-Yan Xie

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Preprint Oct 2026

Oka manifolds are ubiquitous

We prove that a holomorphic family of connected complex Lie groups is Oka if and only if its base is Oka. We establish the Oka property for moduli spaces of stable and parabolic vector bundles and characterize Oka minimal \(\delta\)-regular abelian fibrations over compact curves by the nonnegativity of their orbifold E...

Si-Cheng An, Yun Du, Bin Guo et al. · 0 citations
Preprint Aug 2026

Periods of Oka K3 surfaces are dense

We give the first known examples of Oka Calabi--Yau manifolds in any dimension: every smooth hypersurface of multidegree $(2,\ldots,2)$ in a product of projective lines is Oka. Building on this example, we prove that in every local Kuranishi family of K3 surfaces the points with Oka fibers form a dense $G_\delta$ subse...

Song-Yan Xie, Sheng-Yuan Zhao · 4 citations · ⚡1
Preprint Sep 2026

Oka Geometry and Deformations of Torus-Fibred Complex Six-Spheres

Starting from Alp\"oge's torus fibration with exactly three special fibres on a complex six-sphere, we construct a locally miniversal family of compact complex threefolds. Every member is Oka, and the projection over each relatively compact parameter disc is an Oka map. Deleting or simultaneously blowing up finitely ma...

Yun Du, Bin Guo, Yuta Kusakabe et al. · 1 citation
Preprint Aug 2026

Elliptic complements of cubic hypersurfaces

Let $D\subset\mathbb{P}^n$, $n\geqslant2$, be an arbitrary cubic hypersurface, and let $D_{\mathrm{red}}$ denote its reduced support. We prove that $\mathbb{P}^n\setminus D$ is holomorphically elliptic, and hence Oka, unless $D_{\mathrm{red}}$ is the union of three distinct hyperplanes containing a common codimension-t...

Song-Yan Xie · 1 citation
Preprint Aug 2026

Sharp Summability of Nevanlinna Defects for Finite-Lower-Order Holomorphic Curves

For a countable family of hyperplanes $H_j\subset \mathbb{P}^m$, $j\in\mathbb{N}$, in general position and a linearly nondegenerate holomorphic curve $f\colon \mathbb{C}\to \mathbb{P}^m$ of finite lower order, we prove that the Nevanlinna defects $\delta_f(H_j)$ satisfy $$ \sum_{j=1}^{\infty}\delta_f(H_j)^{1/3}<\infty....

Yun Du, Song-Yan Xie · 0 citations

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