Categories of abelian varieties over finite fields II: Abelian varieties over finite fields and Morita equivalence

Abstract

The category of abelian varieties over ${\mathbb{F}}_q$ is shown to be anti-equivalent to a category of $\mathbb{Z}$-lattices that are modules for a non-commutative pro-ring of endomorphisms of a suitably chosen direct system of abelian varieties over ${\mathbb{F}}_q$. On full subcategories cut out by a finite set $w$ of conjugacy classes of Weil $q$-numbers, the anti-equivalence is represented by what we call $w$-locally projective abelian varieties.

41 pages, revised version following advice by the referee