Singularities of the wave trace for the Friedlander model

Yves Colin de Verdiere, Victor Guillemin, David Jerison

In a recent preprint, we showed that for the Dirichlet Laplacian $\Delta$ on the unit disk, the wave trace $Tr(e^{it\sqrt{\Delta }})$, which has complicated singularities on $2\pi -\epsilon <t<2\pi$,…