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# Heegner Points and the Rank of Elliptic Curves over Large Extensions of Global Fields

Published:2008-06-01
Printed: Jun 2008
• Florian Breuer
• Bo-Hae Im
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## Abstract

Let $k$ be a global field, $\overline{k}$ a separable closure of $k$, and $G_k$ the absolute Galois group $\Gal(\overline{k}/k)$ of $\overline{k}$ over $k$. For every $\sigma\in G_k$, let $\ks$ be the fixed subfield of $\overline{k}$ under $\sigma$. Let $E/k$ be an elliptic curve over $k$. It is known that the Mordell--Weil group $E(\ks)$ has infinite rank. We present a new proof of this fact in the following two cases. First, when $k$ is a global function field of odd characteristic and $E$ is parametrized by a Drinfeld modular curve, and secondly when $k$ is a totally real number field and $E/k$ is parametrized by a Shimura curve. In both cases our approach uses the non-triviality of a sequence of Heegner points on $E$ defined over ring class fields.
 MSC Classifications: 11G05 - Elliptic curves over global fields [See also 14H52]

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