Non-archimedean connected Julia sets with branching
  We construct the first examples of rational functions defined over a non-archimedean field with certain dynamical properties. In particular, we find such functions whose Julia sets, in the Berkovich projective line, are connected but not contained in a line segment. We also show how to compute the measure-theoretic and topological entropy of such maps. In particular, we show for some of our examples that the measure-theoretic entropy is strictly smaller than the topological entropy, thus answering a question of Favre and Rivera-Letelier. 
Dvij Bajpai, Robert L. Benedetto, Ruqian Chen, Edward Kim, Owen   Marschall, Darius Onul, Yang Xiao
math.DS math.NT