Quantum ergodicity and quantum limits for subRiemannian Laplacians
Abstract
This paper is a proceedings version of \cite{CHTI}, in which we state a Quantum Ergodicity (QE) theorem on a 3D contact manifold, and in which we establish some properties of the Quantum Limits (QL). We consider a subRiemannian (sR) metric on a compact 3D manifold with an oriented contact distribution. There exists a privileged choice of the contact form, with an associated Reeb vector field and a canonical volume form that coincides with the Popp measure. We state a QE theorem for the eigenfunctions of any associated sR Laplacian, under the assumption that the Reeb flow is ergodic. The limit measure is given by the normalized canonical contact measure. To our knowledge, this is the first extension of the usual Schnirelman theorem to a hypoelliptic operator. We provide as well a decomposition result of QL's, which is valid without any ergodicity assumption. We explain the main steps of the proof, and we discuss possible extensions to other sR geometries.
 Publication:

arXiv eprints
 Pub Date:
 May 2015
 DOI:
 10.48550/arXiv.1505.01702
 arXiv:
 arXiv:1505.01702
 Bibcode:
 2015arXiv150501702D
 Keywords:

 Mathematics  Spectral Theory;
 Mathematical Physics;
 Mathematics  Analysis of PDEs
 EPrint:
 Appears in S{\'e}minaire Laurent Schwartz  EDP et applications, 2015, Palaiseau, France. 2015. arXiv admin note: text overlap with arXiv:1504.07112