Generic stable ergodicity for tuples of volume-preserving diffeomorphisms

Let MM be a closed manifold with a volume, let k1k\ge 1, and let Diffvolk(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 k1k\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

(Diffvolk(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.

Sources & referencesView supporting material

Primary source

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

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