On the Locus of Hodge Classes

Details On the Locus of Hodge Classes On the Locus of Hodge Classes

1994-02-10

arxiv.org/abs/alg-geom/9402009v1

Mathematics

Algebraic Geometry

25 pages, Plain TeX

Scientific paper

Let $f: X \rightarrow S$ be a family of non singular projective varieties parametrized by a complex algebraic variety $S$. Fix $s \in S$, an integer $p$, and a class $h \in {\rm H}^{2p}(X_s,\Z)$ of Hodge type $(p,p)$. We show that the locus, on $S$, where $h$ remains of type $(p,p)$ is algebraic. This result, which in the geometric case would follow from the rational Hodge conjecture, is obtained in the setting of variations of Hodge structures.

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