The heat trace for the drifting laplacian and schrodinger operators on manifolds
Journal article, 2019
We study the heat trace for both Schrodinger operators as well as the drifting Laplacian on compact Riemannian manifolds. In the case of a finite regularity (bounded and measurable) potential or weight function, we prove the existence of a partial asymptotic expansion of the heat trace for small times as well as a suitable remainder estimate. This expansion is sharp in the following sense: further terms in the expansion exist if and only if the potential or weight function is of higher Sobolev regularity. In the case of a smooth weight function, we determine the full asymptotic expansion of the heat trace for the drifting Laplacian for small times. We then use the heat trace to study the asymptotics of the eigenvalue counting function. In both cases the Weyl law coincides with the Weyl law for the Riemannian manifold with the standard Laplace-Beltrami operator. We conclude by demonstrating isospectrality results for the drifting Laplacian on compact manifolds.