Contact me: andrea.gallese@sns.it
Some problems I have been thinking about.
The connected monodromy field. Let A be an abelian variety defined over a number field k, and consider its associated ℓ-adic Galois representation. The group of components of the image of representation naturally identifies with the Galois group of a finite extension k(eA)/k. This extension is independent of the prime ℓ and, remarkably, coincides with the field of definition of all Tate classes on powers of A. A natural question is: how can one compute this field explicitly?
Splitting Jacobians. Let f: Y -> X be a ramified cover from a complex curve of genus 2 to a complex curve of genus 1. The Jacobian of Y is isogenous to the product of two elliptic curves, one of which is X. How can we determine the other one?