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INTEGRAL AND ADELIC ASPECTS OF THE MUMFORD–TATE CONJECTURE

Published online by Cambridge University Press:  07 June 2018

Anna Cadoret
Affiliation:
IMJ-PRG – Sorbonne Université, Paris, France (anna.cadoret@imj-prg.fr)
Ben Moonen
Affiliation:
Radboud University, IMAPP, Nijmegen, The Netherlands (b.moonen@science.ru.nl)

Abstract

Let $Y$ be an abelian variety over a subfield $k\subset \mathbb{C}$ that is of finite type over $\mathbb{Q}$. We prove that if the Mumford–Tate conjecture for $Y$ is true, then also some refined integral and adelic conjectures due to Serre are true for $Y$. In particular, if a certain Hodge-maximality condition is satisfied, we obtain an adelic open image theorem for the Galois representation on the (full) Tate module of $Y$. We also obtain an (unconditional) adelic open image theorem for K3 surfaces. These results are special cases of a more general statement for the image of a natural adelic representation of the fundamental group of a Shimura variety.

Type
Research Article
Copyright
© Cambridge University Press 2018

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