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Counterexample to N\'eron-Ogg-Shafarevich criterion for Calabi-Yau threefolds

Authors :
Chmiel, Tymoteusz
Oczko, Marcin
Publication Year :
2023

Abstract

For any prime $p>5$ we construct a Calabi-Yau threefold $X$ defined over a finite extension $K$ of $\mathbb{Q}_p$ such that every model of $X$ over $\operatorname{Spec}\mathcal{O}_K$ has singular special fiber, yet the Galois action on the $\ell$-adic cohomology group $H^3_{\acute{e}t}(X,\mathbb{Q}_\ell)$ is unramified for $\ell\neq p$ and crystalline for $\ell=p$. This provides a counterexample to the analogue of the N\'eron-Ogg-Shafarevich criterion for three-dimensional Calabi-Yau manifolds.

Subjects

Subjects :
Mathematics - Algebraic Geometry

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.2309.04008
Document Type :
Working Paper