Weak backward error analysis for SDEs

Details Weak backward error analysis for SDEs Weak backward error analysis for SDEs

2011-05-03

arxiv.org/abs/1105.0489v1

Mathematics

Numerical Analysis

Scientific paper

We consider numerical approximations of stochastic differential equations by the Euler method. In the case where the SDE is elliptic or hypoelliptic, we show a weak backward error analysis result in the sense that the generator associated with the numerical solution coincides with the solution of a modified Kolmogorov equation up to high order terms with respect to the stepsize. This implies that every invariant measure of the numerical scheme is close to a modified invariant measure obtained by asymptotic expansion. Moreover, we prove that, up to negligible terms, the dynamic associated with the Euler scheme is exponentially mixing.

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