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arXiv · 1203.0620

Selmer companion curves

Barry Mazur·Karl Rubin
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Abstract

We say that two elliptic curves E_1, E_2 over a number field K are n-Selmer companions for a positive integer n if for every quadratic character \chi of K, there is an isomorphism between the n-Selmer groups Sel_n(E_1^\chi/K) and Sel_n(E_2^\chi/K) of the quadratic twists E_1^\chi, E_2^\chi. We give sufficient conditions for two elliptic curves to be n-Selmer companions, and give a number of examples of non-isogenous pairs of companions.

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Barry Mazur, Karl Rubin. 2012-03-03. Selmer companion curves. https://arxiv.org/abs/1203.0620

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