Dynamically affine maps in positive characteristic

We study fixed points of iterates of dynamically affine maps (a
generalisation of Latt`es maps) over algebraically closed fields of positive characteristic p. We present and study certain hypotheses that imply a dichotomy
for the Artin–Mazur zeta function of the dynamical system: it is either rational
or non-holonomic, depending on specific characteristics of the map. We also
study the algebraicity of the so-called tame zeta function, the generating function for periodic points of order coprime to p. We then verify these hypotheses
for dynamically affine maps on the projective line, generalising previous work
of Bridy, and, in arbitrary dimension, for maps on Kummer varieties arising
from multiplication by integers on abelian varieties.