English

On signed Mordell-Weil groups for abelian varieties

Number Theory 2025-11-05 v3

Abstract

In this short note, we work in the general framework of supersingular abelian varieties defined over Q\mathbb{Q}. Using Coleman maps constructed by B\"uy\"ukboduk--Lei, we define some objects called ``the multi-signed Mordell-Weil groups" for supersingular abelian varieties, make comments on the structure of the dual of these groups as an Iwasawa module and show a (weak) control theorem. This recovers the case of elliptic curves over Q\mathbb{Q} non-ordinary at the prime pp with ap=0a_p=0 studied by Antonio Lei. Using the multi-signed Mordell-Weil groups we define what we call ``the multi-signed Tate-Shafarevich groups" along the cyclotomic tower of Q\mathbb{Q}. Finally we pose some open questions related to our newly defined objects and make a remark on the asymptotic growth of these multi-signed Tate-Shafarevich groups along the cyclotomic tower using an idea of Meng Fai Lim.

Keywords

Cite

@article{arxiv.2304.13452,
  title  = {On signed Mordell-Weil groups for abelian varieties},
  author = {Jishnu Ray},
  journal= {arXiv preprint arXiv:2304.13452},
  year   = {2025}
}

Comments

To appear in Conference proceedings of ICCGNFRT (International Conference on Class Groups of Number Fields and Related Topics)

R2 v1 2026-06-28T10:18:22.447Z