Drinfeld modules and torsion in the Chow groups of certain threefolds |
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Authors: | Schoen, Chad Top, Jaap |
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Affiliation: | Department of Mathematics Duke University Box 90320 Durham, NC 27708-0320 USA schoen{at}math.duke.edu |
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Abstract: | Let E B be an elliptic surface defined over the algebraic closureof a finite field of characteristic greater than 5. Let W bea resolution of singularities of E x B E. We show that the l-adicAbel–Jacobi map from the l-power-torsion in the secondChow group of W to H3(W, l(2)) l/l is an isomorphism for almostall primes l. A main tool in the proof is the assertion thatcertain CM-cycles in fibres of W B are torsion, which is provenusing results from the theory of Drinfeld modular curves. |
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