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Elliptic curves with nonsplit mod representations
Authors:Imin Chen  Chris Cummins
Institution:Department of Mathematics, Simon Fraser University, Burnaby, British Columbia, Canada, V5A 1S6 ; Department of Mathematics and Statistics, Concordia University, Montreal, Quebec, Canada, H3G 1M8
Abstract:We calculate explicitly the $j$-invariants of the elliptic curves corresponding to rational points on the modular curve $X_{ns}^+(11)$ by giving an expression defined over $\mathbb{Q} $ of the $j$-function in terms of the function field generators $X$ and $Y$of the elliptic curve $X_{ns}^+(11)$. As a result we exhibit infinitely many elliptic curves over $\mathbb{Q} $ with nonsplit mod $11$representations.

Keywords:
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