2-Selmer near-companion curves

Abstract

Let $E$ and $A$ be elliptic curves over a number field $K$. Let $\chi$ be a quadratic character of $K$. We prove the conjecture posed by Mazur and Rubin on $n$-Selmer near-companion curves in the case $n=2$. Namely, we show if the difference of the $2$-Selmer ranks of $E^{\chi }$ and $A^{\chi }$ is bounded independent of $\chi$, there is a $G_K$-isomorphism $E[2]\cong A[2]$.

16 pages

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• Large Shafarevich-Tate groups over quadratic number fields