Semiclassical measures for the Schrödinger equation on the torus

Nalini Anantharaman (1) , Fabricio Macià (2)

1 LM-Orsay - Laboratoire de Mathématiques d'Orsay
2 UPM - Universidad Politécnica de Madrid

In this article, the structure of semiclassical measures for solutions to the linear Schr\"{o}dinger equation on the torus is analysed. We show that the disintegration of such a measure on every invariant lagrangian torus is absolutely continuous with respect to the Lebesgue measure. We obtain an expression of the Radon-Nikodym derivative in terms of the sequence of initial data and show that it satisfies an explicit propagation law. As a consequence, we also prove an observability inequality, saying that the $L^2$-norm of a solution on any open subset of the torus controls the full $L^2$-norm.

Mots clés: equation de Schrödinger; mesures semiclassiques; analyse harmonique

Domaines: Mathématiques générales [math.GM]; Equations aux dérivées partielles [math.AP]

Nalini Anantharaman, Fabricio Macià. Semiclassical measures for the Schrödinger equation on the torus. 2011. ⟨hal-00476829v2⟩