Lundi 18 Janvier
Heure: 
14:00  18:00 
Lieu: 
Salle B405, bâtiment B, LAGA, Institut Galilée, Université Paris 13 
Résumé: 
Analyse semiclassique & Physique mathématique  Problèmes Spectraux en Physique Mathématique  
Description: 
Séminaire tournant 
Heure: 
14:00  18:00 
Lieu: 
Salle B405, bâtiment B, LAGA, Institut Galilée, Université Paris 13 
Résumé: 
EDP & Physique mathématique  Problèmes Spectraux en Physique Mathématique  
Description: 
Séminaire tournant 
Jeudi 21 Janvier
Heure: 
10:00  11:00 
Lieu: 
Séminaire en ligne 
Résumé: 
Topologie algébrique  Minimal models for graphsrelated operadic algebras  
Description: 
Jovana ObradovicWe construct explicit minimal models for the (hyper)operads governing modular, 
Vendredi 22 Janvier
Heure: 
10:30  12:00 
Lieu: 
Exposé en distanciel 
Résumé: 
Géométrie Arithmétique et Motivique  Around the conjectures of Mazur and Rubin on the distribution of modular symbols  
Description: 
Asbjørn NordentoftLien researchseminars.org 
Heure: 
15:30  16:30 
Lieu: 
Visioséminaire 
Résumé: 
PM  EDP  Codimension one stable blowup and threshold phenomena for supercritical wave equations  
Description: 
Birgit Schörkhuber
Selfsimilar solutions play an important role in the dynamics of nonlinear evolution equations and can provide explicit examples for the formation of singularities in finite time. This talk is concerned with wave equations with a focusing power nonlinearity in the socalled energy supercritical case. These rather simple models serve as toy problems for more involved field equations from theoretical physics. After a brief summary of known results on blowup dynamics for this class of equations, I will present new explicit examples of selfsimilar solutions for the wave equation with a cubic, respectively, a quadratic nonlinearity. I will discuss methods to analyse the stability of these solutions and show that they are codimension one stable modulo symmetries. Furthermore, we discuss their role in the characterization of the threshold between finitetime blowup and global existence. 
Heure: 
15:30  16:30 
Lieu: 
Visioséminaire 
Résumé: 
Équations aux Dérivées Partielles nonlinéaires  Codimension one stable blowup and threshold phenomena for supercritical wave equations  
Description: 
Birgit Schörkhuber
Selfsimilar solutions play an important role in the dynamics of nonlinear evolution equations and can provide explicit examples for the formation of singularities in finite time. This talk is concerned with wave equations with a focusing power nonlinearity in the socalled energy supercritical case. These rather simple models serve as toy problems for more involved field equations from theoretical physics. After a brief summary of known results on blowup dynamics for this class of equations, I will present new explicit examples of selfsimilar solutions for the wave equation with a cubic, respectively, a quadratic nonlinearity. I will discuss methods to analyse the stability of these solutions and show that they are codimension one stable modulo symmetries. Furthermore, we discuss their role in the characterization of the threshold between finitetime blowup and global existence. 

