Irreducibility of geometric Galois representations and the Tate conjecture for a family of elliptic surfaces

Abstract

Using Calegari's result on the Fontaine-Mazur conjecture, we study the irreducibility of pure, regular, rank 3 weakly compatible systems of self-dual l-adic representations. As a consequence, we prove that the Tate conjecture holds for a family of elliptic surfaces defined over Q with geometric genus bigger than 1.

Minor changes. To appear in Math. Res. Lett