Mathematics > Number Theory
[Submitted on 30 Mar 2011 (v1), last revised 27 Feb 2024 (this version, v5)]
Title:Torsion groups of elliptic curves over quadratic fields
View PDF HTML (experimental)Abstract:We describe methods to determine all the possible torsion groups of an elliptic curve that actually appear over a fixed quadratic field. We use these methods to find, for each group that can appear over a quadratic field, the field with the smallest absolute value of it's discriminant such that there exists an elliptic curve with that torsion. We also examine the interplay of the torsion and rank over a fixed quadratic field and see that what happens is very different than over $\Q$. Finally we give some results concerning the number and density of fields with an elliptic curve with given torsion over them.
Submission history
From: Filip Najman [view email][v1] Wed, 30 Mar 2011 12:34:47 UTC (13 KB)
[v2] Thu, 22 Nov 2012 09:52:22 UTC (13 KB)
[v3] Thu, 14 Apr 2016 16:18:59 UTC (13 KB)
[v4] Mon, 19 Feb 2024 14:13:28 UTC (13 KB)
[v5] Tue, 27 Feb 2024 14:36:34 UTC (13 KB)
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