%0 Journal Article
%T Counting the Resonances in High and Even Dimensional Obstacle Scattering
%A Lung-Hui Chen
%J Mathematics
%D 2011
%I arXiv
%X In this paper, we give a polynomial lower bound for the resonances of $-\Delta$ perturbed by an obstacle in even-dimensional Euclidean spaces, $n\geq4$. The proof is based on a Poisson Summation Formula which comes from the Hadamard factorization theorem in the open upper complex plane. We take advantage of the singularity of regularized wave trace to give the pole/resonance counting function over the principal branch of logarithmic plane a lower bound.
%U http://arxiv.org/abs/1105.4972v1