English

Elliptic curves with p-Selmer growth for all p

Number Theory 2015-08-27 v3

Abstract

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.

Keywords

Cite

@article{arxiv.1204.1166,
  title  = {Elliptic curves with p-Selmer growth for all p},
  author = {Alex Bartel},
  journal= {arXiv preprint arXiv:1204.1166},
  year   = {2015}
}

Comments

7 pages; improved exposition. Final version to appear in Q. J. Math