Generic stable ergodicity for tuples of volume-preserving diffeomorphisms

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Let MM be a closed manifold with a volume, let k≥1k\ge 1, and let Diff⁡vol⁡k(M)\operatorname{Diff}^k_{\operatorname{vol}}(M) denote the space of CkC^k volume-preserving diffeomorphisms of MM. A tuple (f1,…,fm)(f_1,\ldots,f_m) is stably ergodic when its associated random dynamical system remains ergodic under sufficiently small perturbations. Generic stable ergodicity conjecture. For each closed manifold MM with volume and regularity k≥1k\ge 1, there exists mm such that the space of stably ergodic tuples (f1,…,fm)(f_1,\ldots,f_m) is open and dense in

(Diff⁡vol⁡k(M))m.\left(\operatorname{Diff}^k_{\operatorname{vol}}(M)\right)^m.

The conjecture asserts that a small, possibly minimal, amount of randomness should generically ensure robust ergodic and statistical properties; its resolution would make exponential mixing a generic property for random dynamical systems.

References

Primary source

Jonathan DeWitt and Dmitry Dolgopyat, “Expanding on average diffeomorphisms of surfaces: exponential mixing”, arXiv:2410.08445 (2024).

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