Spectral asymptotics of sub-Riemannian Laplacians on compact Heisenberg manifolds
Let \(N_M(\lambda)\) be the spectral counting function of the sub-Laplacian on the compact Heisenberg manifold \(M=\Gamma\backslash\mathbb H_d\), where $\Gamma$ is a lattice subgroup of the Heisenberg group $\mathbb H_d$. In 2016, Strichartz \cite[\textit{J. Geom. Anal.}]{Str16} proved the Weyl law with remainder \(R_M...