Published online by Cambridge University Press: 26 August 2016
Let $C/\mathbf{Q}$ be a curve of genus three, given as a double cover of a plane conic. Such a curve is hyperelliptic over the algebraic closure of
$\mathbf{Q}$, but may not have a hyperelliptic model of the usual form over
$\mathbf{Q}$. We describe an algorithm that computes the local zeta functions of
$C$ at all odd primes of good reduction up to a prescribed bound
$N$. The algorithm relies on an adaptation of the ‘accumulating remainder tree’ to matrices with entries in a quadratic field. We report on an implementation and compare its performance to previous algorithms for the ordinary hyperelliptic case.
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