Integral and adelic aspects of the Mumford-Tate conjecture

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 $Y$. Our second main result is an (unconditional) adelic open image theorem for K3 surfaces. The proofs of these results rely on the study of a natural representation of the fundamental group of a Shimura variety.

References in corpus (2)

• Adelic openness without the Mumford-Tate conjecture
• On the $\ell$-adic Galois representations attached to nonsimple abelian varieties

Cited by in corpus (2)

• Finiteness theorems for K3 surfaces and abelian varieties of CM type
• Surjectivity of Galois Representations in Rational Families of Abelian Varieties