2017/01/26 by Mark Goresky, Goresky, Mark, Yung-sheng Tai +1
Mathematics · #Advanced Algebra and Geometry #Algebraic Geometry and Number Theory #Algebraic structures and combinatorial models
paper · pdf · doi:10.48550/arxiv.1701.07742
The authors define an "anti-holomorphic" involution (or "real structure") on an ordinary Abelian variety (defined over a finite field k) to be an involution of the associated Deligne module (T,F,V) that exchanges F (the Frobenius) with V (the Verschiebung). The definition extends to include principal polarizations and certain level structures. The authors show there are finitely many isomorphism classes in each dimension, and they give a formula for this number which resembles the Kottwitz "counting formula" (for the number of principally polarized Abelian varieties over k), where the symplectic group (in the Kottwitz formula) has been replaced by the general linear group.