Arithmetic on Elliptic Threefolds

Details Arithmetic on Elliptic Threefolds Arithmetic on Elliptic Threefolds

2001-12-23

arxiv.org/abs/math/0112259v1

Mathematics

Number Theory

34 pages

Scientific paper

In a recent paper, Rosen and Silverman showed that Tate's conjecture on the order of vanishing of L(E,s) implies Nagao's formula, which gives the rank of an elliptic surface in terms of a weighted average of fibral Frobenius trace values. The aim of this article is to extend their result to the case of elliptic threefolds, and deduce, from Tate's conjecture, a Nagao-type formula for the rank of an elliptic threefold E. This will require a two-pronged approach: on the one hand, we need some cohomological results in order to derive a Shioda-Tate-like formula for elliptic threefolds; on the other, we compute an "average" number of rational points on the singular fibers and relate this to the action of Galois on those fibers.

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