On the locus of Hodge classes
On the locus of Hodge classes
复制标题
关于 Hodge 类的轨迹
DOI:
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发表时间:
1994
期刊:
影响因子:
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通讯作者:
A. Kaplan
中科院分区:
文献类型:
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作者:
E. Cattani;P. Deligné;A. Kaplan
Let S be a complex algebraic variety and {Xs}s∈S a family of non singular projective varieties parametrized by S: the Xs are the fibers of f : X → S, with X projective and smooth over S. Fix s ∈ S, an integer p, and a class h ∈ H(Xs,Z) of Hodge type (p, p). Let U be an open, simply connected neighborhood of s. The H(Xt,Z), t ∈ S, form a local system on S, necessarily trivial on U , so that for t ∈ U they can all be identified with H(Xs,Z). The Hodge filtration Ft of H (Xt,C), t ∈ U , can be viewed as a variable filtration on the fixed complex vector space H(Xs,C). It varies holomorphically with t. It follows that the locus T ⊂ U where h remains of type (p, p), i.e., in F, is a complex analytic subspace of U .