On a selection problem for small noise perturbation of ODE in multidimensional case

Speaker(s): 
Andrey Pilipenko (Kiev Polytechnic Institute)
Date: 
Wednesday, April 26, 2017 - 6:15pm
Location: 
WIAS, Erhard-Schmidt-Saal, Mohrenstraße 39, 10117 Berlin

The identification problem of the limit of an ODE with non-Lipschitz drift perturbed by a zero-noise is considered in a multidimensional framework. This problem is a classical subject of stochastic analysis, however the multidimensional case was poorly investigated. We consider two cases in particular:
(i) the drift coefficient has a jump discontinuity along an hyperplane and is Lipschitz continuous in the upper and lower half-spaces;
(ii) the drift is equivalent to a (phi) r^\alpha as r tends to 0, where (r,phi) are the polar coordinates, and \alpha < 1.