The Semisimplicity Conjecture for A-Motives
Abstract
We prove the semisimplicity conjecture for A-motives over finitely generated fields K. This conjecture states that the rational Tate modules Vp(M) of a semisimple A-motive M are semisimple as representations of the absolute Galois group of K. This theorem is in analogy with known results for abelian varieties and Drinfeld modules, and has been sketched previously by Akio Tamagawa. We deduce two consequences of the theorem for the algebraic monodromy groups Gp(M) associated to an A-motive M by Tannakian duality. The first requires no semisimplicity condition on M and states that Gp(M) may be identified naturally with the Zariski closure of the image of the absolute Galois group of K in the automorphism group of Vp(M). The second states that the connected component of Gp(M) is reductive if M is semisimple and has a separable endomorphism algebra.