Stochastic Flows of SDEs with Irregular Coefficients and Stochastic Transport Equations

Mathematics – Probability

Scientific paper

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32Pages, add the existence of invariant measures

Scientific paper

In this article we study (possibly degenerate) stochastic differential equations (SDE) with irregular (or discontiuous) coefficients, and prove that under certain conditions on the coefficients, there exists a unique almost everywhere stochastic (invertible) flow associated with the SDE in the sense of Lebesgue measure. In the case of constant diffusions and BV drifts, we obtain such a result by studying the related stochastic transport equation. In the case of non-constant diffusions and Sobolev drifts, we use a direct method. In particular, we extend the recent results on ODEs with non-smooth vector fields to SDEs. Moreover, we also give a criterion for the existence of invariant measures for the associated transition semigroup.

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