Abelian varieties with many endomorphisms and their absolutely simple factors

Details Abelian varieties with many endomorphisms and their absolutely simple factors Abelian varieties with many endomorphisms and their absolutely simple factors

2011-02-04

arxiv.org/abs/1102.0863v1

Mathematics

Number Theory

To appear in Revista Matem\'atica Iberoamericana

Scientific paper

We characterize the abelian varieties arising as absolutely simple factors of GL2-type varieties over a number field k. In order to obtain this result, we study a wider class of abelian varieties: the k-varieties A/k satisfying that $\End_k^0(A)$ is a maximal subfield of $\End_k^0(A)$. We call them Ribet-Pyle varieties over k. We see that every Ribet-Pyle variety over k is isogenous over $\bar k$ to a power of an abelian k-variety and, conversely, that every abelian k-variety occurs as the absolutely simple factor of some Ribet-Pyle variety over k. We deduce from this correspondence a precise description of the absolutely simple factors of the varieties over k of GL2-type.

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