Xavier Cabré : Sharp isoperimetric inequalities via the ABP method

Premier atelier de l'ERC « Reaction-Diffusion Equations,Propagations and Modelling »    Journées d'étude organisées par Henri Berestycki et Jean-Michel Roquejoffre   EHESS,24-25 septembre 2013  Séquence 2: Xavier Cabré (ICREA and UPC,Barcelona)  Sharp isoperimetric inequalities via the ABP method  We prove some old and new isoperimetric inequalities with the best constant via the ABP method. More precisely,we obtain a new family of sharp isoperimetric inequalities with weights (or densities) in open convex cones of $mathbb{R}^n$. Our results apply to all nonnegative homogeneous weights satisfying a concavity condition in the cone. Surprisingly,even that our weights are not radially symmetric,Euclidean balls centered at the origin (intersected with the cone) minimize the weighted isoperimetric quotient. As a particular case of our results,we provide with new proofs of classical results such as the Wulff inequality and the isoperimetric inequality in convex cones   of Lions and Pacella. Furthermore,we also study the anisotropic isoperimetric problem for the same class of weights and we prove that the Wulff shape always minimizes the anisotropic weighted perimeter under the weighted volume constrain.

Disciplines : Mathématiques,Analyse
Mots-clés : combinatoire,informatique,probabilité,EHESS
Type de document : image en mouvement
Type de ressource : lecture
Niveau : higher education
Auteurs ou éditeurs : Xavier CABRE,Henri BERESTYCKI,Philippe KERGRAISSE,Direction de l'Audiovisuel de l'EHESS (Dir. Jean-Claude Penrad)