On Limiting Behavior of Stationary Measures for Stochastic Evolution Systems with Small Noise Intensity

The limiting behavior of stochastic evolution processes with small noise intensity $ε$ is investigated in distribution-based approach. Let $μ^ε$ be stationary measure for stochastic process $X^ε$ with small $ε$ and $X^{0}$ be a semiflow on a Polish space. Assume that $\{μ^ε: 0<ε\leqε_0\}$ is tight. Then all their limits in weak sense are $X^0-$invariant and their supports are contained in Birkhoff center of $X^0$. Applications are made to various stochastic evolution systems, including stochastic ordinary differential equations, stochastic partial differential equations, stochastic functional differential equations driven by Brownian motion or Lévy process.

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