In this paper we show that, for a sub-Laplacian Δ on a 3-dimensional manifold M, no point interaction centered at a point exists. When M is complete w.r.t. the associated sub-Riemannian structure, this means that Δ acting on is essentially self-adjoint in . A particular example is the standard sub-Laplacian on the Heisenberg group. This is in stark contrast with what happens in a Riemannian manifold N, whose associated Laplace-Beltrami operator acting on is never essentially self-adjoint in , if . We then apply this result to the Schrödinger evolution of a thin molecule, i.e., with a vanishing moment of inertia, rotating around its center of mass.
Cite this article
Ugo Boscain, Valentina Franceschi, Dario Prandi, Riccardo Adami, Point interactions for 3D sub-Laplacians. Ann. Inst. H. Poincaré Anal. Non Linéaire 38 (2021), no. 4, pp. 1095–1113DOI 10.1016/J.ANIHPC.2020.10.007