\(C^0\)-stability of topological entropy for contactomorphisms. (English) Zbl 1471.53068
Summary: Topological entropy is not lower semi-continuous: small perturbation of the dynamical system can lead to a collapse of entropy. In this note we show that for some special classes of dynamical systems (geodesic flows, Reeb flows, positive contactomorphisms) topological entropy at least is stable in the sense that there exists a nontrivial continuous lower bound, given that a certain homological invariant grows exponentially.
MSC:
| 53D35 | Global theory of symplectic and contact manifolds |
| 53D40 | Symplectic aspects of Floer homology and cohomology |
| 37B40 | Topological entropy |
| 57R17 | Symplectic and contact topology in high or arbitrary dimension |
| 55N31 | Persistent homology and applications, topological data analysis |
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