Ranks of elliptic curves with prescribed torsion over number fields

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• Johan Bosman (Warwick)
• Tuesday 28 February 2012, 14:30-15:30
• MR13.

If you have a question about this talk, please contact Tom Fisher.

Let d be a positive integer, and let T_d be the set of isomorphism classes of groups that can occur as the torsion subgroup of E(K), where K is a number field of degree d and E is an elliptic curve over K. T₁ is known by Mazur’s theorem, T₂ is known as well, and for d equal to 3 or 4, it is known which groups occur infinitely often.

We shall study the following problem: given a d <= 4 and a group T in T_d, what are the possibilities for the Mordell-Weil rank of E, where E is an elliptic curve over a number field K of degree d with the torsion subgroup of E(K) isomorphic to T. For d = 2 and T = Z/13Z or T = Z/18Z, and also for d = 4 and T = Z/22Z, it turns out that the rank is always even. This will be explained by a phenomenon we call “false complex multiplication”.

This is joint work with Peter Bruin, Andrej Dujella, and Filip Najman.

This talk is part of the Number Theory Seminar series.

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