Journal
COMPOSITIO MATHEMATICA
Volume 140, Issue 3, Pages 567-580Publisher
KLUWER ACADEMIC PUBL
DOI: 10.1112/S0010437X03000381
Keywords
elliptic n-fold; Mordell-Weil group; Shioda-Tate formula; Nagao formula; Frobenius trace values
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In a recent paper, Rosen and Silverman showed that Tate's conjecture on algebraic cycles implies a formula of Nagao, which gives the rank of an elliptic surface in terms of a weighted average of fibral Frobenius trace values. In this article, we extend their result to the case of elliptic threefolds. The main ingredients of our argument are a Shioda-Tate-like formula for elliptic threefolds, and a relation between the 'average' number of rational points on singular fibers and the Galois action on those fibers.
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