Elliptic curves with p-Selmer growth for all p

Details Elliptic curves with p-Selmer growth for all p Elliptic curves with p-Selmer growth for all p

2012-04-05

arxiv.org/abs/1204.1166v2

Mathematics

Number Theory

7 pages; several corrections in the introduction

Scientific paper

It is known, that for every elliptic curve over Q there exists a quadratic extension in which the rank does not go up. For a large class of elliptic curves, the same is known with the rank replaced by the 2-Selmer group. We show, however, that there exists a large supply of semistable elliptic curves E/Q whose 2-Selmer group goes up in every bi-quadratic extension and for any odd prime p, the p-Selmer group goes up in every D_{2p}-extension and every elementary abelian p-extension of rank at least 2. We provide a simple criterion for an elliptic curve over an arbitrary number field to exhibit this behaviour. We also discuss generalisations to other Galois groups.

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