Strong Uniformity for Integral Points on an Algebraic Torus over Torsion Divisors

Recall Faltings' and Vojta's results on the Zariski nondensity of integral points on a semiabelian variety defined over a number field. We will consider this property in the case of $\mathbb{G}_{\mathrm{m}}^{N}$ ($N \geq 1$). If $K$ is a number field, $S$ is a finite set of places of $K$, including all the infinite ones, and $D$ is a nonzero effective divisor on $\mathbb{G}_{\mathrm{m}}^{N}$, then the set $\mathbb{G}^{N}_{\mathrm{m},D}(\mathcal{O}_{K,S})$ of $(D,S)$-integral points on $\mathbb{G}_{\mathrm{m}}^{N}$, belonging to $\mathbb{G}_{\mathrm{m}}^{N}(K)$, is not Zariski dense in $\mathbb{G}^{N}_{\mathrm{m}}$. A question is how this set varies with $D$ varying. We will prove that the union of these sets is still not Zariski dense in $\mathbb{G}^{N}_{\mathrm{m}}$ when $D$ runs over the set of all torsion hypersurfaces of bounded degree of $\mathbb{G}_{\mathrm{m}}^{N}$.

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Publication Details

Journal
Taiwanese Journal of Mathematics
Published
2025-10-03
DOI
https://doi.org/10.11650/tjm/250902
Primary Topic
Algebraic Geometry and Number Theory
Type
article
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article

Strong Uniformity for Integral Points on an Algebraic Torus over Torsion Divisors

Su-Ion Ih
Taiwanese Journal of Mathematics
Algebraic Geometry and Number Theory
article

Strong Uniformity for Integral Points on an Algebraic Torus over Torsion Divisors

Su-Ion Ih
article en

Abstract

Recall Faltings' and Vojta's results on the Zariski nondensity of integral points on a semiabelian variety defined over a number field. We will consider this property in the case of $\mathbb{G}_{\mathrm{m}}^{N}$ ($N \geq 1$). If $K$ is a number field, $S$ is a finite set of places of $K$, including all the infinite ones, and $D$ is a nonzero effective divisor on $\mathbb{G}_{\mathrm{m}}^{N}$, then the set $\mathbb{G}^{N}_{\mathrm{m},D}(\mathcal{O}_{K,S})$ of $(D,S)$-integral points on $\mathbb{G}_{\mathrm{m}}^{N}$, belonging to $\mathbb{G}_{\mathrm{m}}^{N}(K)$, is not Zariski dense in $\mathbb{G}^{N}_{\mathrm{m}}$. A question is how this set varies with $D$ varying. We will prove that the union of these sets is still not Zariski dense in $\mathbb{G}^{N}_{\mathrm{m}}$ when $D$ runs over the set of all torsion hypersurfaces of bounded degree of $\mathbb{G}_{\mathrm{m}}^{N}$.

Taiwanese Journal of MathematicsVol. 30(1)
Openalex Percentile: Top 67%
Algebraic Geometry and Number Theory
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