# Mistuned Toeplitz operators and applications

 Orateur: BOULTON Lyonell Localisation: Université Heriot-Watt, Royaume-Uni Type: Séminaire problèmes spectraux en physique mathématique Site: IHP Salle: 314 Date de début: 10/06/2013 - 15:30 Date de fin: 10/06/2013 - 15:30

The study of a new family of highly non-self-adjoint operators which is reminiscent of the classical Toeplitz operators arises naturally in the context of evolution problems connected to sandpiles/slow-fast diﬀusion. The aim of this talk is to describe the diﬃculties involved in determining general spectral properties of operators in this family and show how to overcome these diﬃculties. In turns we will establish basisness/non-basisness theorems for general families of 1D periodic functions. We will then apply the latter, in order to examine non-orthogonal projection methods for the $p$-poisson parabolic time-evolution initial value problem with stochastic forcing.