Pure and Applied Mathematics Quarterly
Volume 9 (2013)
Special Issue: In Memory of Andrey Todorov, Part 1 of 3
Pseudo-Effective Classes and Pushforwards
Pages: 643 – 664
Given a morphism between complex projective varieties, we make several conjectures on the relations between the set of pseudo-effective (co)homology classes which are annihilated by pushforward and the set of classes of varieties contracted by the morphism. We prove these conjectures for classes of curves or divisors. We also prove that one of these conjectures implies Grothendieck’s generalized Hodge conjecture for varieties with Hodge coniveau at least 1.
pseudo-effective classes, Hodge conjecture
2010 Mathematics Subject Classification