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arXiv 1301.4002math.AG
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伪有效类和前推

Pseudo-effective classes and pushforwards

O. Debarre, Z. Jiang, C. Voisin

摘要:

给出了复投射簇之间的一个态射,讨论了被推进湮没的伪有效(余)同调类集合与被态射收缩的簇类集合之间的关系.我们证明了曲线类或因子类的这些定理。我们还证明了这些命题之一意味着Grothendieck的广义Hodge猜想的品种与Hodge coniveau至少为1。

英文摘要:

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.

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