The average rank of elliptic -folds
arXiv:1010.0152 · doi:10.1512/IUMJ.2012.61.4540
Abstract
Let be a variety of dimension at least two. We show that the density of elliptic curves with positive rank is zero if has dimension at least 3 and is at most if is a surface.
Expansion of the discussion of the cycle class map; several minor changes