3 years ago

Arithmetic aspects of the Burkhardt quartic threefold

Brett Nasserden, Nils Bruin


We show that the Burkhardt quartic threefold is rational over any field of characteristic distinct from 3. We compute its zeta function over finite fields. We realize one of its moduli interpretations explicitly by determining a model for the universal genus 2 curve over it, as a double cover of the projective line. We show that the j ‐planes in the Burkhardt quartic mark the order 3 subgroups on the Abelian varieties it parametrizes, and that the Hesse pencil on a j ‐plane gives rise to the universal curve as a discriminant of a cubic genus 1 cover.

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