Skip to content
Licensed Unlicensed Requires Authentication Published by De Gruyter November 1, 2023

Ramified covers of abelian varieties over torsion fields

  • Lior Bary-Soroker , Arno Fehm EMAIL logo and Sebastian Petersen

Abstract

We study rational points on ramified covers of abelian varieties over certain infinite Galois extensions of . In particular, we prove that every elliptic curve E over has the weak Hilbert property of Corvaja and Zannier both over the maximal abelian extension ab of , and over the field ( A tor ) obtained by adjoining to all torsion points of some abelian variety A over .


Dedicated to Moshe Jarden on the occasion of his 80th birthday


Funding statement: Lior Bary-Soroker was supported by the Israel Science Foundation (grant no. 702/19). Sebastian Petersen was supported by a research grant UMO-2018/31/B/ST1/01474 of the National Centre of Sciences of Poland.

Acknowledgements

The authors would like to thank Daniele Garzoni for helpful discussions around [12], Cornelius Greither for interesting discussions around Lemma 2.11, Remy van Dobben de Bruyn for the suggestion to use the Hilbert scheme in the proof of Lemma 2.13, and the referee as well as Jakob Stix for helpful remarks on the submitted version. Part of this work was done while A.F. was a guest of Tel Aviv University, and he would like to thank the School of Mathematics for their hospitality.

References

[1] L. Bary-Soroker and A. Fehm, Open problems in the theory of ample fields, Geometric and differential Galois theories, Sémin. Congr. 27, Société Mathématique de France, Paris (2013), 1–11. Search in Google Scholar

[2] L. Bary-Soroker, A. Fehm and S. Petersen, On varieties of Hilbert type, Ann. Inst. Fourier (Grenoble) 64 (2014), no. 5, 1893–1901. 10.5802/aif.2899Search in Google Scholar

[3] L. Bary-Soroker, A. Fehm and G. Wiese, Hilbertian fields and Galois representations, J. reine angew. Math. 712 (2016), 123–139. 10.1515/crelle-2013-0116Search in Google Scholar

[4] L. Bary-Soroker and D. Garzoni, Hilbert’s irreducibility theorem via random walks, Int. Math. Res. Not. IMRN 2023 (2023), no. 14, 12512–12537. 10.1093/imrn/rnac188Search in Google Scholar

[5] M. Bays, B. Hart and A. Pillay, Universal covers of commutative finite Morley rank groups, J. Inst. Math. Jussieu 19 (2020), no. 3, 767–799. 10.1017/S1474748018000191Search in Google Scholar

[6] M. Bhattacharjee, D. Macpherson, R. G. Möller and P. M. Neumann, Notes on infinite permutation groups, Lecture Notes in Math. 1698, Springer, Berlin 1997. 10.1007/978-93-80250-91-5Search in Google Scholar

[7] M. Borovoi, Homogeneous spaces of Hilbert type, Int. J. Number Theory 11 (2015), no. 2, 397–405. 10.1142/S1793042115500207Search in Google Scholar

[8] S. Bosch, W. Lütkebohmert and M. Raynaud, Néron models, Ergeb. Math. Grenzgeb. (3) 21, Springer, Berlin 1990. 10.1007/978-3-642-51438-8Search in Google Scholar

[9] N. Bourbaki, Algebré commutative, Springer, Berlin 2006. 10.1007/978-3-540-33976-2Search in Google Scholar

[10] S. Coccia, The Hilbert property for integral points of affine smooth cubic surfaces, J. Number Theory 200 (2019), 353–379. 10.1016/j.jnt.2018.11.024Search in Google Scholar

[11] J.-L. Colliot-Thélène and J.-J. Sansuc, Principal homogeneous spaces under flasque tori: Applications, J. Algebra 106 (1987), no. 1, 148–205. 10.1016/0021-8693(87)90026-3Search in Google Scholar

[12] P. Corvaja, J. L. Demeio, A. Javanpeykar, D. Lombardo and U. Zannier, On the distribution of rational points on ramified covers of abelian varieties, Compos. Math. 158 (2022), no. 11, 2109–2155. 10.1112/S0010437X22007746Search in Google Scholar

[13] P. Corvaja and U. Zannier, On the Hilbert property and the fundamental group of algebraic varieties, Math. Z. 286 (2017), no. 1–2, 579–602. 10.1007/s00209-016-1775-xSearch in Google Scholar

[14] J. L. Demeio, Non-rational varieties with the Hilbert property, Int. J. Number Theory 16 (2020), no. 4, 803–822. 10.1142/S1793042120500414Search in Google Scholar

[15] J. L. Demeio, Elliptic fibrations and the Hilbert property, Int. Math. Res. Not. IMRN 2021 (2021), no. 13, 10260–10277. 10.1093/imrn/rnz108Search in Google Scholar

[16] R. Dvornicich and U. Zannier, Cyclotomic Diophantine problems (Hilbert irreducibility and invariant sets for polynomial maps), Duke Math. J. 139 (2007), no. 3, 527–554. 10.1215/S0012-7094-07-13934-6Search in Google Scholar

[17] B. Edixhoven, G. van der Geer and B. Moonen, Abelian varieties, manuscript, http://van-der-geer.nl/~gerard/AV.pdf. Search in Google Scholar

[18] B. Fantechi, L. Göttsche, L. Illusie, S. L. Kleiman, N. Nitsure and A. Vistoli, Fundamental algebraic geometry, Math. Surveys Monogr. 123, American Mathematical Society, Providence 2005. 10.1090/surv/123Search in Google Scholar

[19] A. Fehm, M. Jarden and S. Petersen, Kuykian fields, Forum Math. 24 (2012), no. 5, 1013–1022. 10.1515/form.2011.094Search in Google Scholar

[20] A. Fehm and S. Petersen, On the rank of abelian varieties over ample fields, Int. J. Number Theory 6 (2010), no. 3, 579–586. 10.1142/S1793042110003071Search in Google Scholar

[21] A. Fehm and S. Petersen, Hilbertianity of division fields of commutative algebraic groups, Israel J. Math. 195 (2013), no. 1, 123–134. 10.1007/s11856-012-0064-6Search in Google Scholar

[22] G. Frey and M. Jarden, Approximation theory and the rank of abelian varieties over large algebraic fields, Proc. Lond. Math. Soc. (3) 28 (1974), 112–128. 10.1112/plms/s3-28.1.112Search in Google Scholar

[23] M. D. Fried and M. Jarden, Field arithmetic, 3rd ed., Ergeb. Math. Grenzgeb. (3) 11, Springer, Berlin 2008. Search in Google Scholar

[24] A. Grothendieck, Éléments de géométrie algébrique. II. Étude globale élémentaire de quelques classes de morphismes, Publ. Math. Inst. Hautes Études Sci. 8 (1961), 5–222. 10.1007/BF02699291Search in Google Scholar

[25] A. Grothendieck, Éléments de géométrie algébrique. IV. Étude locale des schémas et des morphismes de schémas. I, Publ. Math. Inst. Hautes Études Sci. 20 (1964), 5–259. 10.1007/BF02684747Search in Google Scholar

[26] A. Grothendieck, Éléments de géométrie algébrique. IV. Étude locale des schémas et des morphismes de schémas. II, Publ. Math. Inst. Hautes Études Sci. (1965), no. 24, 5–231. 10.1007/BF02684322Search in Google Scholar

[27] A. Grothendieck, Éléments de géométrie algébrique. IV. Étude locale des schémas et des morphismes des schémas. III, Publ. Math. Inst. Hautes Études Sci. 32 (1967), 5–361. 10.1007/BF02732123Search in Google Scholar

[28] A. Grothendieck, Séminaire de géométrie algébrique du Bois-Marie. SGA1 - Revêtements étales et groupe fondamental, Lecture Notes in Math. 224, Springer, Berlin 1971. 10.1007/BFb0058657Search in Google Scholar

[29] A. Grothendieck, Techniques de construction et théorèmes d’existence en géométrie algébrique. IV. Les schémas de Hilbert, Séminaire Bourbaki. Vol. 6, Société Mathématique de France, Paris (1995), 249–276, Exp. No. 221. Search in Google Scholar

[30] P. Habegger, Small height and infinite nonabelian extensions, Duke Math. J. 162 (2013), no. 11, 2027–2076. 10.1215/00127094-2331342Search in Google Scholar

[31] D. Haran, Hilbertian fields under separable algebraic extensions, Invent. Math. 137 (1999), no. 1, 113–126. 10.1007/s002220050325Search in Google Scholar

[32] B.-H. Im and M. Larsen, Infinite rank of elliptic curves over ab , Acta Arith. 158 (2013), no. 1, 49–59. 10.4064/aa158-1-3Search in Google Scholar

[33] M. Jarden, Diamonds in torsion of abelian varieties, J. Inst. Math. Jussieu 9 (2010), no. 3, 477–480. 10.1017/S1474748009000255Search in Google Scholar

[34] A. Javanpeykar, Rational points and ramified covers of products of two elliptic curves, Acta Arith. 198 (2021), no. 3, 275–287. 10.4064/aa200513-3-11Search in Google Scholar

[35] A. Javanpeykar, Hilbert irreducibility for varieties with a nef tangent bundle, J. Ramanujan Math. Soc., to appear. Search in Google Scholar

[36] W. Kuyk, Extensions de corps hilbertiens, J. Algebra 14 (1970), 112–124. 10.1016/0021-8693(70)90138-9Search in Google Scholar

[37] S. Lang, Diophantine geometry, John Wiley & Sons, New York 1962. Search in Google Scholar

[38] S. Lang, Fundamentals of Diophantine geometry, Springer, New York 1983. 10.1007/978-1-4757-1810-2Search in Google Scholar

[39] M. Larsen, A Mordell–Weil theorem for abelian varieties over fields generated by torsion points, preprint (2005), https://arxiv.org/abs/math/0503378. Search in Google Scholar

[40] J. D. P. Meldrum, Wreath products of groups and semigroups, Pitman Monogr. Surv. Pure Appl. Math. 74, Longman, Harlow 1995. Search in Google Scholar

[41] J. S. Milne, Abelian varieties, Arithmetic geometry, Springer, New York (1986), 103–150. 10.1007/978-1-4613-8655-1_5Search in Google Scholar

[42] J. S. Milne, Algebraic groups, Cambridge Stud. Adv. Math. 170, Cambridge University, Cambridge 2017. Search in Google Scholar

[43] D. Mumford, Abelian varieties, Oxford University, London 1970. Search in Google Scholar

[44] M. Nakahara and S. Streeter, Weak approximation and the Hilbert property for Campana points, preprint (2020), https://arxiv.org/abs/2010.12555. Search in Google Scholar

[45] S. Petersen, On a question of Frey and Jarden about the rank of abelian varieties, J. Number Theory 120 (2006), no. 2, 287–302. 10.1016/j.jnt.2005.12.006Search in Google Scholar

[46] F. Sairaiji and T. Yamauchi, The rank of Jacobian varieties over the maximal abelian extensions of number fields: Towards the Frey–Jarden conjecture, Canad. Math. Bull. 55 (2012), no. 4, 842–849. 10.4153/CMB-2011-140-5Search in Google Scholar

[47] J.-P. Serre, Résumé des cours de 1985-1986, Annuaire du Collège de France, Paris 1986. Search in Google Scholar

[48] J.-P. Serre, Topics in Galois theory, 2nd ed., Res. Notes in Math. 1, A K Peters, Wellesley 2008. Search in Google Scholar

[49] J.-P. Serre, Un critère d’indépendance pour une famille de représentations -adiques, Comment. Math. Helv. 88 (2013), no. 3, 541–554. 10.4171/CMH/295Search in Google Scholar

[50] S. Streeter, Hilbert property for double conic bundles and del Pezzo varieties, Math. Res. Lett. 28 (2021), no. 1, 271–283. 10.4310/MRL.2021.v28.n1.a11Search in Google Scholar

[51] C. Thornhill, Abelian varieties and Galois extensions of Hilbertian fields, J. Inst. Math. Jussieu 12 (2013), no. 2, 237–247. 10.1017/S1474748012000680Search in Google Scholar

[52] U. Zannier, Hilbert irreducibility above algebraic groups, Duke Math. J. 153 (2010), no. 2, 397–425. 10.1215/00127094-2010-027Search in Google Scholar

[53] Y. G. Zarhin, Hyperelliptic Jacobians without complex multiplication, Math. Res. Lett. 7 (2000), no. 1, 123–132. 10.4310/MRL.2000.v7.n1.a11Search in Google Scholar

[54] The Stacks Project Authors, Stacks Project, https://stacks.math.columbia.edu, 2023. Search in Google Scholar

Received: 2022-09-24
Revised: 2023-08-17
Published Online: 2023-11-01
Published in Print: 2023-12-01

© 2023 Walter de Gruyter GmbH, Berlin/Boston

Downloaded on 28.4.2024 from https://www.degruyter.com/document/doi/10.1515/crelle-2023-0077/html
Scroll to top button