Special components of Noether-Lefschetz loci

被引:2
|
作者
Movasati, Hossein [1 ]
机构
[1] Inst Matematica Pura & Aplicada, Estr Dona Castorina 110, BR-22460320 Rio De Janeiro, RJ, Brazil
关键词
Noetger-Lefschetz locus; Infinitesimal variation of Hodge structures; Algebraic cycles; DIMENSION;
D O I
10.1007/s12215-020-00523-4
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
We take a sum C-1 + rC(2), r is an element of Q of a line C-1 and a complete intersection curve C-2 of type (3, 3) inside a smooth surface of degree 8 and with C-1 boolean AND C-2 = empty set. We gather evidences to the fact that for all except a finite number of r, the Noether-Lefschetz loci attached to the cohomology classes of C-1 + rC(2) are distinct 31 codimensional subvarieties intersecting each other in a 32 codimensional subvariety of the ambient space. The maximum codimension for components of the Noether-Lefschetz locus in this case is 35, and hence, we provide a conjectural description of a counterexample to a conjecture of J. Harris. The methods used in this paper also produce in a rigorous way an infinite number of general components passing through the point representing the Fermat surface of degree <= 9, and many non-reduced components for such degrees.
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页码:861 / 874
页数:14
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