A rank-$2$ vector bundle on ${\mathbb P}^2\times {\mathbb P}^2$ and projective geometry of nonclassical Enriques surfaces in characteristic 2

Ziv Ran; Jürgen Rathmann

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arXiv · 2504.16174

A rank-$2$ vector bundle on ${\mathbb P}^2\times {\mathbb P}^2$ and projective geometry of nonclassical Enriques surfaces in characteristic 2

Ziv Ran·Jürgen Rathmann

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Abstract

We study zero-sets of a particular family rank-2 indecomposable vector bundles $E$ on $\mathbb P^2 \times\mathbb P ^2$ in characteristic 2, introduced in our earlier paper. We show that the zero-sets of a suitable twist of $E$ form a family of nonclassical smooth Enriques surfaces of bidegree $(4, 4)$ whose general member is ordinary in the sense that Frobenius acts isomorphically on $H^1$, and which admits a divisor consisting of smooth supersingular surfaces (Frobenius acts as zero). We show further that every nonclassical Enriques surface of bidegree $(4, 4)$ that is bilinearly normal arises as a zero-set in this way.

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Ziv Ran, Jürgen Rathmann. 2026-08-04. A rank-$2$ vector bundle on ${\mathbb P}^2\times {\mathbb P}^2$ and projective geometry of nonclassical Enriques surfaces in characteristic 2. https://arxiv.org/abs/2504.16174

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