Torsion cohomology classes and algebraic cycles on complex projective manifolds

Details Torsion cohomology classes and algebraic cycles on complex projective manifolds Torsion cohomology classes and algebraic cycles on complex projective manifolds

2004-03-16

arxiv.org/abs/math/0403254v2

Mathematics

Algebraic Geometry

Final version, to appear in Adv. in Mathematics, special issue dedicated to M. Artin. References to related work by C. Schoen

Scientific paper

Atiyah and Hirzebruch gave examples ofeven degree torsion classes in the singularcohomology of a smooth complex projective manifold, which arenot Poincar\'{e} dual to an algebraiccycle. We notice that the order ofthese classes are small comparedto the dimension of the manifold.However, building upon a construction ofKoll\`{a}r, one can provide such examples witharbitrary high prime order, the dimension being fixed. This method alsoprovides examples of torsion algebraiccycles, which are non trivial in the Griffiths' groups, and lie in a arbitrary high level of the H.Saito filtration onChow groups.

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