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arxiv: 1801.10536 · v1 · pith:JJHBNMHRnew · submitted 2018-01-31 · 🧮 math.NT

Large Shafarevich-Tate groups over quadratic number fields

classification 🧮 math.NT
keywords mathbfmathrmquadraticshafarevich-tateconditionscurvedenteelliptic
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Let $E$ be an elliptic curve over the rational field $\mathbf{Q}$. Let $K$ be a quadratic extension over $\mathbf{Q}$. Let $\mathrm{ST}(E/K)$ dente the Shafarevich-Tate group of $E$ over $K$. We show that (under mild conditions on $E$) for every $r>0$, there are infinitely many quadratic twists $E^d/\mathbf{Q}$ of $E/\mathbf{Q}$ such that $\mathrm{dim}_{\mathbf{F}_2}(\mathrm{ST}(E^d/K)[2]) > r$

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