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arXiv · 2001.10229

Nonspecial varieties and Generalized Lang-Vojta conjectures

Erwan Rousseau·Amos Turchet·Julie Tzu-Yueh Wang
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Abstract

We construct a family of fibered threefolds $X_m \to (S , \Delta)$ such that $X_m$ has no \'etale cover that dominates a variety of general type but it dominates the orbifold $(S,\Delta)$ of general type. Following Campana, the threefolds $X_m$ are called \emph{weakly special} but not \emph{special}. The Weak Specialness Conjecture predicts that a weakly special variety defined over a number field has a potentially dense set of rational points. We prove that if $m$ is big enough the threefolds $X_m$ present behaviours that contradict the function field and analytic analogue of the Weak Specialness Conjecture. We prove our results by adapting the recent method of Ru and Vojta. We also formulate some generalizations of known conjectures on exceptional loci that fit into Campana's program and prove some cases over function fields.

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Erwan Rousseau, Amos Turchet, Julie Tzu-Yueh Wang. 2020-01-28. Nonspecial varieties and Generalized Lang-Vojta conjectures. https://doi.org/10.1017/fms.2021.8

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