Monodromy and the tate conjecture: Picard numbers and mordell-weil ranks in families

A. Johan De Jong, Nicholas M. Katz

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

We use results of Deligne on ℓ-adic monodroray and equidistribution, combined with elementary facts about the eigenvalues of elements in the orthogonal group, to give upper bounds for the average "middle Picard number" in various equicharacteristic families of even dimensional hypersurfaces, cf. 6.11, 6.12, 6.14, 7.6, 8.12. We also give upper bounds for the average Mordell-Weil rank of the Jacobian of the generic fibre in various equicharacteristic families of surfaces fibred over P1, cf. 9.7, 9.8. If the relevant Tate Conjecture holds, each upper bound we find for an average is in fact equal to that average.

Original languageEnglish (US)
Pages (from-to)47-79
Number of pages33
JournalIsrael Journal of Mathematics
Volume120
DOIs
StatePublished - Jan 1 2000

All Science Journal Classification (ASJC) codes

  • Mathematics(all)

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