Galois actions on Q-curves and Winding Quotients

Details Galois actions on Q-curves and Winding Quotients Galois actions on Q-curves and Winding Quotients

2003-12-02

arxiv.org/abs/math/0312049v1

Mathematics

Number Theory

Scientific paper

We prove two "large images" results for the Galois representations attached to a degree $d$ Q-curve $E$ over a quadratic field $K$: if $K$ is arbitrary, we prove maximality of the image for every prime $p >13$ not dividing $d$, provided that $d$ is divisible by $q$ (but $d \neq q$) with $q=2$ or 3 or 5 or 7 or 13. If $K$ is real we prove maximality of the image for every odd prime $p$ not dividing $d D$, where $D = \disc(K)$, provided that $E$ is a semistable Q-curve. In both cases we make the (standard) assumptions that $E$ does not have potentially good reduction at all primes $p \nmid 6$ and that $d$ is square-free.

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