Symbolic Extensions and dominated splittings for Generic C^1-Diffeomorphisms

Abstract

Let Diff^1(M) be the set of all C^1-diffeomorphisms f : M \rightarrow M, where M is a compact boundaryless d-dimensional manifold, d \geq 2. We prove that there is a residual subset R of Diff^1(M) such that if f \in R and if H(p) is the homoclinic class associated with a hyperbolic periodic point p, then either H(p) admits a dominated splitting of the form E\oplusF1 \oplus...\oplusFk \oplusG, where Fi is not hyperbolic and one-dimensional, or f|H(p) has no symbolic extensions.

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• A lower bound for topological entropy of generic non Anosov symplectic diffeomorphisms
• Entropy-expansiveness for partially hyperbolic diffeomorphisms
• A C1 generic condition for existence of symbolic extensions of volume preserving diffeomorphisms
• The Entropy Conjecture for Diffeomorphisms away from Tangencies