Chow-Kunneth decomposition for universal families over Picard modular surfaces

Details Chow-Kunneth decomposition for universal families over Picard modular surfaces Chow-Kunneth decomposition for universal families over Picard modular surfaces

2005-05-02

arxiv.org/abs/math/0505017v4

Mathematics

Algebraic Geometry

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Scientific paper

We discuss the existence of an absolute Chow-Kuenneth decomposition for complete degenerations of families of Abelian threefolds with complex multiplication over a particular Picard Modular Surface studied by Holzapfel. In addition to the work of Gordon, Hanamura and Murre we use Relatively Complete Models in the sense of Mumford-Faltings-Chai of Picard Modular Surfaces in order to describe complete degenerations of families of abelian varieties. We furthermore prove vanishing results for cohomology groups of irreducible representations of certain arithmetic subgroups in SU(2,1) using the non--compact Simpson type correspondence between the $L^2$--Higgs cohomology of the underlying VHS and the $L^2$--de Rham cohomology resp. intersection cohomology of local systems.

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