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Hyperelliptic Curves with Maximal Galois Action on the Torsion Points of their Jacobians (1705.08777v3)
Published 24 May 2017 in math.NT, math.AG, math.GR, and math.RT
Abstract: In this article, we show that in each of four standard families of hyperelliptic curves, there is a density-$1$ subset of members with the property that their Jacobians have adelic Galois representation with image as large as possible. This result constitutes an explicit application of a general theorem on arbitrary rational families of abelian varieties to the case of families of Jacobians of hyperelliptic curves. Furthermore, we provide explicit examples of hyperelliptic curves of genus $2$ and $3$ over $\mathbb Q$ whose Jacobians have such maximal adelic Galois representations.