The $p$-rank of the reduction $\rm{mod}\, p$ of jacobians and Jacobi sums

Details The $p$-rank of the reduction $\rm{mod}\, p$ of jacobians and Jacobi sums The $p$-rank of the reduction $\rm{mod}\, p$ of jacobians and Jacobi sums

2011-11-02

arxiv.org/abs/1111.0545v2

Mathematics

Algebraic Geometry

21 pages

Scientific paper

Let $Y_K\to X_K$ be a ramified cyclic covering of curves, where $K$ is a cyclotomic field. In this work we study the $p$-rank of the reduction $\rm{mod}\, p$ of a model of the jacobian of $Y_K$. In this way, we obtain counterparts of the Deuring polynomial, defined for elliptic curves, for genus greater than one. Moreover, we show that curves $Y_K$ give Hecke characters for cyclotomic fields. To carry out this study we use Jacobi sums and certain $L$-functions.

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