Torsion algebraic cycles and complex cobordism

Details Torsion algebraic cycles and complex cobordism Torsion algebraic cycles and complex cobordism

1996-09-23

arxiv.org/abs/alg-geom/9609016v2

Mathematics

Algebraic Geometry

20 pages

Scientific paper

We show that the cycle map on a variety X, from algebraic cycles modulo algebraic equivalence to integer cohomology, lifts canonically to a topologically defined quotient of the complex cobordism ring of X. This more refined cycle map gives a topological proof that the Griffiths group is nonzero for some varieties X, without any use of Hodge theory. We also use this more refined cycle map to give examples of torsion algebraic cycles which map to 0 in Deligne cohomology but are not algebraically equivalent to 0, thus answering some questions by Colliot-Thelene and Schoen.

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