The spectrum of the Laplacian on a manifold of nonnegative Ricci curvature
The author proves that the \(L_2\)-spectrum of the Laplacian on a complete noncompact Riemannian manifold with asymptotically nonnegative Ricci curvature is given by the half line \([0,\infty)\).
scientific article; zbMATH DE number 1082975