Hindry's integral torsion-point conjecture for abelian varieties

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Let kk) be a number field, let SS be a finite set of places of kk containing the archimedean places, and let Ok,S{\mathcal O}_{k,S} be the ring of SS-integers. Let A/kA/k be an abelian variety, and let AS/Spec⁡(Ok,S){\mathcal A}_S/\operatorname{Spec}({\mathcal O}_{k,S}) be a model of AA. Let DD be an effective divisor on AA, defined over k‾\overline{k}, with at least one irreducible component that is not the translate of an abelian subvariety by a torsion point, and let D‾\overline{D} be its Zariski closure in AS{\mathcal A}_S. Define AD,S(Z‾)tors⁡A_{D,S}(\overline{\mathbb Z})_{\operatorname{tors}} to be the set of torsion points of A(k‾)A(\overline{k}) whose closure in AS{\mathcal A}_S is disjoint from D‾\overline{D}. Hindry's conjecture. The set AD,S(Z‾)tors⁡A_{D,S}(\overline{\mathbb Z})_{\operatorname{tors}} is not Zariski dense in AA. This extends the Manin–Mumford phenomenon to torsion points satisfying an SS-integrality condition; the paper presents it as a general conjecture for abelian varieties, with the elliptic-curve case supplied by the main theorem. Its general status is not resolved in the supplied text.

References

Primary source

Matthew Baker, Su-Ion Ih and Robert Rumely, “A finiteness property of torsion points”, arXiv:math/0509485 (2005).

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