Shadowing for Infinite Dimensional Dynamical Systems

Abstract: In this paper we extend some results about Shadowing Lemma there are known on finite dimensional compact manifolds without border and $\mathbb{R}^n$, to an infinite dimensional space. In fact, we prove that if ${\mathcal{T}(t):t\ge 0}$ is a Morse-Smale semigroup defined in a Hilbert space with global attractor $\mathcal{A}$, then $\mathcal{T}(1)|{\mathcal{A}}:\mathcal{A}\to \mathcal{A} $ admits the Lipschitz Shadowing property. Moreover, for any positively invariant bounded neighborhood $\mathcal{U}\supset\mathcal{A}$ of the global attractor, the map $\mathcal{T}(1)|{\mathcal{U}}:\mathcal{U}\to \mathcal{U}$ has the H\"{o}lder-Shadowing property. As applications, we obtain new results related to the structural stability of Morse-Smale semigroups defined in Hilbert spaces and continuity of global attractors.