Flexibility versus genericity of phase diagrams of perturbed continuous maps on the Cantor set

Abstract

Consider the dynamical system constitued by a continuous function $F:\mathcal{A}^\mathbb{N}\to\mathcal{A}^\mathbb{N}$ where $\mathcal{A}$ is a finite alphabet. The perturbed counterpart, denoted by $F_\epsilon$, is obtained after each iteration of $F$ by modifying each cell independently with probability $\epsilon\in[0,1]$ and choosing the new value uniformly. We characterize the possible sets of $\epsilon\in[0,1]$ such that $F_\epsilon$ has a unique measure. These sets are exactly the $G_\delta$ sets (countable intersection of open sets) of $[0, 1]$ which contain 1. However, we show that generically this set is $]0, 1]$.