Generalized hyperbolicity for diffeomorphisms of Banach spaces

Abstract

We introduce generalized hyperbolicity for nonlinear dynamics in Banach spaces. The definition allows the stable/unstable splitting to be discontinuous and requires only inclusions, rather than equalities, in the invariance conditions for both subspaces. On smooth compact manifolds, generalized hyperbolicity is equivalent to Axiom~A and the strong transversality condition, providing a finite-dimensional calibration of the proposed Banach-space theory. For $C^1$-diffeomorphisms of the whole Banach space such that $Df$ and $D(f^{-1})$ are globally bounded and $Df$ is uniformly continuous, we establish the principal dynamical consequences of generalized hyperbolicity: Lipschitz shadowing, density of periodic points in the chain-recurrent set, and robustness under perturbations small in the uniform $C^1$ distance. The shadowing result requires no continuity of the splitting, and shadowing trajectories need not be unique. Under the additional assumption that the splitting is uniformly continuous, we prove semi-structural stability. If, in addition, the subspace $E_x^s\oplus (Df(x){)}^{-1}{E}_{f(x)}^u$ is independent of $x$, we obtain structural stability.

56 pages, Added Theorem connection Axiom A and generalized hyperbolicity, introduction is reorganized