Statistics of abelian varieties over finite fields

Joint IAS/Princeton University Number Theory Seminar
Topic:Statistics of abelian varieties over finite fields
Speaker:Michael Lipnowski
Affiliation:Duke University
Date:Thursday, February 11
Time/Room:4:30pm - 5:30pm/Fine 214, Princeton University

Joint work with Jacob Tsimerman. Let $B(g,p)$ denote the number of isomorphism classes of $g$-dimensional abelian varieties over the finite field of size $p$. Let $A(g,p)$ denote the number of isomorphism classes of principally polarized $g$ dimensional abelian varieties over the finite field of size $p$. We derive upper bounds for $B(g,p)$ and lower bounds for $A(g,p)$ for $p$ fixed and $g$ increasing. The extremely large gap between the lower bound for $A(g,p)$ and the upper bound $B(g,p)$ implies some statistically counterintuitive behavior for abelian varieties of large dimension over a fixed finite field.