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journal article

Ergodicity of hypoelliptic SDEs driven by fractional Brownian motion

Hairer, Martin  
•
Pillai, N. S.
May 1, 2011
ANNALES DE L INSTITUT HENRI POINCARE-PROBABILITES ET STATISTIQUES

We demonstrate that stochastic differential equations (SDEs) driven by fractional Brownian motion with Hurst parameter H > 1/2 have similar ergodic properties as SDEs driven by standard Brownian motion. The focus in this article is on hypoelliptic systems satisfying Hormander's condition. We show that such systems enjoy a suitable version of the strong Feller property and we conclude that under a standard controllability condition they admit a unique stationary solution that is physical in the sense that it does not "look into the future."The main technical result required for the analysis is a bound on the moments of the inverse of the Malliavin covariance matrix, conditional on the past of the driving noise.

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