Laboratoire J. A. Dieudonné

Séminaire de l'équipe EDP Analyse Numérique

Séminaires à venir   -   Liste complète 2020-2021   -   Archives 2009-2020

21/10/2021 
   14h
   Salle de conférences
Cyril Letrouit (DMA (ENS))
   Propagation of singularities in subelliptic PDEs
   In this talk, we consider the wave equation where the Laplacian is replaced by a sub-Laplacian (also called ``Hörmander sum of square''), which is an hypoelliptic operator. We handle the problem of describing the propagation of singularities in such equations : the main new phenomenon that we describe is that singularities can propagate along abnormal curves at any speed between $0$ and $1$. This general result extends an idea due to R. Melrose, and we then illustrate it on an example, the Martinet case, following a joint work with Y. Colin de Verdière. Our statements are part of a classical/quantum correspondance between sub-Riemannian geometry (on the classical side) and the hypoelliptic operator (on the quantum side), which is also helpful to interpret results in control theory and spectral theory of hypoelliptic operators.
   Gestion: Maxime
7/10/2021 
   
   
Workshop Numerical Waves ()
   
   
   Gestion: Maxime
18/11/2021 
   14h
   Zoom
Lise-Marie Imbert-Gérard (University of Arizona)
   
   
   Gestion: Maxime
25/11/2021 
   14h
   TBA
Rachele Allena (LJAD)
   TBA
   
   Gestion: Florence
02/12/2021 
   14h
   Zoom
Antoine Cerfon (Courant Institute (New York))
   Fast numerical schemes for the stepped pressure plasma model
   
   Gestion: Florence
16/12/2021 
   
   Salle de conférences
Soutenance de l'HDR de Claire Scheid ()
   
   

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