The a-numbers of Jacobians of Suzuki curves

Details The a-numbers of Jacobians of Suzuki curves The a-numbers of Jacobians of Suzuki curves

2011-10-31

arxiv.org/abs/1110.6898v1

Mathematics

Number Theory

Keywords: Suzuki curve, maximal curve, Jacobian, p-torsion, a-number

Scientific paper

For $m \in {\mathbb N}$, let $S_m$ be the Suzuki curve defined over ${\mathbb F}_{2^{2m+1}}$. It is well-known that $S_m$ is supersingular, but the p-torsion group scheme of its Jacobian is not known. The a-number is an invariant of the isomorphism class of the p-torsion group scheme. In this paper, we compute a closed formula for the a-number of $S_m$ using the action of the Cartier operator on $H^0(S_m,\Omega^1)$.

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