Dynatomic Galois groups for a family of quadratic rational maps

Abstract

For every nonconstant rational function $\varphi \in \mathbb{Q}(x)$, the Galois groups of the dynatomic polynomials of $\varphi$ encode various properties of $\varphi$ that are of interest in the subject of arithmetic dynamics. We study here the structure of these Galois groups as $\varphi$ varies in a particular one-parameter family of maps, namely the quadratic rational maps having a critical point of period 2. In particular, we provide explicit descriptions of the third and fourth dynatomic Galois groups for maps in this family.