An Arakelov Inequality in Characteristic p and Upper Bound of p-Rank Zero Locus

Details An Arakelov Inequality in Characteristic p and Upper Bound of p-Rank Zero Locus An Arakelov Inequality in Characteristic p and Upper Bound of p-Rank Zero Locus

2008-11-10

arxiv.org/abs/0811.1529v2

Journal of Number Theory, 129 (2009) 3029-3045

Mathematics

Algebraic Geometry

26 pages

Scientific paper

In this paper we show an Arakelov inequality for semi-stable families of algebraic curves of genus $g\geq 1$ over characteristic $p$ with nontrivial Kodaira-Spencer maps. We apply this inequality to obtain an upper bound of the number of algebraic curves of $p-$rank zero in a semi-stable family over characteristic $p$ with nontrivial Kodaira-Spencer map in terms of the genus of a general closed fiber, the genus of the base curve and the number of singular fibres. An extension of the above results to smooth families of Abelian varieties over $k$ with $W_2$-lifting assumption is also included.

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