Essential self-adjointness of Sub-elliptic Laplacians

Jeudi 11 octobre 14:00-15:00 - Valentina Franceschi - Orsay

Résumé : The aim of this seminar is to present recent results about essential self-adjointness of sub-elliptic laplacians. These are hypoelliptic operators defined on a manifold M, that are naturally associated to a geometric structure on it. In the case when such a structure is Riemannian and complete, the associated Laplace-Beltrami operator is indeed essentially self-adjoint. This amounts to say that the solutions to the Schrödinger equation on M are well defined without imposing any boundary conditions. Our purpose is to address the case when the structure is sub-Riemannian : this can be thought of as a generalization of the Riemannian case, under anisotropic constraints on the directions of motion on M. In particular, singularities may appear, encoded in the blow up of an intrinsic measure, whose definition depends only on the geometry. In this case the problem is still open and a standing conjecture, formulated by Boscain and Laurent, asserts that the sub-elliptic Laplacian is essentially self-adjoint. We will explain our results supporting the conjecture and underline the cases that are not included in our analysis. In collaboration with D. Prandi (CNRS, CentraleSupélec, Giffes-sur-Yvette, France) and L. Rizzi (CNRS & Institut Fourier, Grenoble, France)

Lieu : salle 2L8 (IMO, bâtiment 307)

Notes de dernières minutes : Café culturel assuré à 13h par Konstantin Pankrashkin

Essential self-adjointness of Sub-elliptic Laplacians  Version PDF