Relative Chow-Kunneth decompositions for conic bundles and Prym varieties

Details Relative Chow-Kunneth decompositions for conic bundles and Prym varieties Relative Chow-Kunneth decompositions for conic bundles and Prym varieties

2008-06-09

arxiv.org/abs/0806.1507v2

Mathematics

Algebraic Geometry

19 pages, to appear in IMRN

Scientific paper

We construct a relative Chow-Kunneth decomposition for a conic bundle over a surface such that the middle projector gives the Prym variety of the associated double covering of the discriminant of the conic bundle. This gives a refinement (up to an isogeny) of Beauville's theorem on the relation between the intermediate Jacobian of the conic bundle and the Prym variety of the double covering.

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