Noise-induced order from positive Lyapunov exponents

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Let II be the phase space and let T:I→IT:I\to I be a C1C^1, nonsingular dynamical system admitting a unique absolutely continuous invariant measure with positive Lyapunov exponent. Let mm denote this measure. Noise-induced order conjecture. If

−∞<∫log⁡(∣T′∣) dm<0,-\infty<\int \log(|T'|)\,dm<0,

then the system presents Noise Induced Order, meaning that there exist 0<ξ1<ξ20<\xi_1<\xi_2 such that for every ξ>ξ1\xi>\xi_1 the system has a unique stationary measure with density fξf_{\xi} and the Lyapunov exponent of the stationary measure satisfies λ(ξ1)>0\lambda(\xi_1)>0 and λ(ξ2)<0\lambda(\xi_2)<0. The conjecture proposes a general mechanism linking stochastic stability and transitions in Lyapunov exponents for one-dimensional systems with additive noise; the paper presents the criterion as a conjectural extension of known stochastic-stability results, and its resolution is not supplied here.

References

Primary source

Isaia Nisoli, “How does noise induce order?”, arXiv:2003.08422 (2022).

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