Pathwise Accuracy and Ergodicity of Metropolized Integrators for SDEs

Details Pathwise Accuracy and Ergodicity of Metropolized Integrators for SDEs Pathwise Accuracy and Ergodicity of Metropolized Integrators for SDEs

2009-05-26

arxiv.org/abs/0905.4218v1

Mathematics

Numerical Analysis

46 pages, 5 figures

Scientific paper

10.1002/cpa.20306

Metropolized integrators for ergodic stochastic differential equations (SDE) are proposed which (i) are ergodic with respect to the (known) equilibrium distribution of the SDE and (ii) approximate pathwise the solutions of the SDE on finite time intervals. Both these properties are demonstrated in the paper and precise strong error estimates are obtained. It is also shown that the Metropolized integrator retains these properties even in situations where the drift in the SDE is nonglobally Lipschitz, and vanilla explicit integrators for SDEs typically become unstable and fail to be ergodic.

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