Torsion groups of elliptic curves over quadratic fields

Details Torsion groups of elliptic curves over quadratic fields Torsion groups of elliptic curves over quadratic fields

2011-03-30

arxiv.org/abs/1103.5906v1

Mathematics

Number Theory

19 pages

Scientific paper

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.

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