On second order elliptic equations with a small parameter

Details On second order elliptic equations with a small parameter On second order elliptic equations with a small parameter

2012-03-22

arxiv.org/abs/1203.5096v2

Mathematics

Probability

26 pages, 1 figure, comments are welcome

Scientific paper

The Neumann problem with a small parameter $$(\dfrac{1}{\epsilon}L_0+L_1)u^epsilon(x)=f(x) \text{for} x\in G, .\dfrac{\partial u^\epsilon(x)}{\partial \gamma^\epsilon(x)}|_{\partial G}=0$$ is considered in this paper. The operators $L_0$ and $L_1$ are self-adjoint second order operators. We assume that $L_0$ has a non-negative characteristic form and $L_1$ is strictly elliptic. The reflection is with respect to inward co-normal unit vector $\gamma^\epsilon(x)$. The behavior of $\lim\limits_{\epsilon\downarrow 0}u^\epsilon(x)$ is effectively described via the solution of an ordinary differential equation on a tree. We calculate the differential operators inside the edges of this tree and the gluing condition at the root. Our approach is based on an analysis of the corresponding diffusion processes.

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