Mirror couplings and Neumann eigenfunctions

Details Mirror couplings and Neumann eigenfunctions Mirror couplings and Neumann eigenfunctions

2006-07-18

arxiv.org/abs/math/0607400v1

Mathematics

Probability

37 pages

Scientific paper

We analyze a pair of reflected Brownian motions in a planar domain $D$, for which the increments of both processes form mirror images of each other when the processes are not on the boundary. We show that for $D$ in a class of smooth convex planar domains, the two processes remain ordered forever, according to a certain partial order. This is used to prove that the second eigenvalue is simple for the Laplacian with Neumann boundary conditions for the same class of domains.

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