Published online by Cambridge University Press: 30 June 2020
The bounded height conjecture of Bombieri, Masser, and Zannier states that for any sufficiently generic algebraic subvariety of a semiabelian $\overline{\mathbb{Q}}$-variety
$G$ there is an upper bound on the Weil height of the points contained in its intersection with the union of all algebraic subgroups having (at most) complementary dimension in
$G$. This conjecture has been shown by Habegger in the case where
$G$ is either a multiplicative torus or an abelian variety. However, there are new obstructions to his approach if
$G$ is a general semiabelian variety. In particular, the lack of Poincaré reducibility means that quotients of a given semiabelian variety are intricate to describe. To overcome this, we study directly certain families of line bundles on
$G$. This allows us to demonstrate the conjecture for general semiabelian varieties.
This work was supported by an Ambizione Grant of the Swiss National Science Foundation.