Singularities of the wave trace near cluster points of the length spectrum

Yves Colin de Verdière, Victor Guillemin, David Jerison

Let $-{\lambda }_j$ be the eigenvalues of the Laplace operator on the unit disk with Dirichlet conditions. The distribution $h(t)={\sum }_j{e}^{i{\sqrt{\lambda }}_{j}t}$ is the trace of the solution oper…