Abstract
We consider a simple class of fast-slow partially hyperbolic dynamical systems and show that the (properly rescaled) behaviour of the slow variable is very close to a Freidlin–Wentzell type random system for times that are rather long, but much shorter than the metastability scale. Also, we show the possibility of a “sink” with all the Lyapunov exponents positive, a phenomenon that turns out to be related to the lack of absolutely continuity of the central foliation.
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Notes
In fact in such papers it was assumed only \(F_\varepsilon \in {\mathcal C}^4({\mathbb T}^2,{\mathbb T}^2)\), here we need a bit more regularity.
Admittedly a rather degenerate Markov process as the transition kernel is singular.
\(F_*\) stands for the pushforward, namely \(F_*\mu (\varphi )=\mu (\varphi \circ F)\).
Recall that \(\mu \) is a physical measure if, for all continuous g, \(\lim _{n\rightarrow \infty }\frac{1}{n}\sum _{k=0}^{n-1}g\circ F_\varepsilon ^k(x)=\mu (g)\) for x belonging to a set of positive Lebesgue measure.
Note that [13, Theorem 6.3], does not provide the explicit T dependence in the lower bound of the measure of \(Q_h\) stated here, however the latter is not needed to prove that the measure is strictly positive. On the other end, once there exists one trajectory in \(supp \,\ell \) that ends up in \(B(\theta _1,\frac{1}{2}{C_\#}\varepsilon ^{ 5/12})\), then trajectories that start in an \(\exp {-{c_\#}\varepsilon ^{-1} T}\) neighborhood will depart from such a trajectory less than \(\frac{1}{2}{C_\#}\varepsilon ^{ 5/12}\) in time T, hence the current claim.
Related results are present in [30], where they are investigated from the point of view of viscosity solutions.
We refrain from proving it but it is not very hard to check it numerically.
As defined after Theorem 5
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Acknowledgments
This work has been supported by the European Advanced Grant Macroscopic Laws and Dynamical Systems (MALADY) (ERC AdG 246953). D. V. has been partially funded by the Russian Academic Excellence Project ‘5–100’.
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de Simoi, J., Liverani, C., Poquet, C. et al. Fast–Slow Partially Hyperbolic Systems Versus Freidlin–Wentzell Random Systems. J Stat Phys 166, 650–679 (2017). https://doi.org/10.1007/s10955-016-1628-3
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DOI: https://doi.org/10.1007/s10955-016-1628-3