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Perte de régularité pour les équations d’ondes sur-critiques

Gilles Lebeau (2005)

Bulletin de la Société Mathématique de France

On prouve que le problème de Cauchy local pour l’équation d’onde sur-critique dans d , u + u p = 0 , p impair, avec d 3 et p > ( d + 2 ) / ( d - 2 ) , est mal posé dans H σ pour tout σ ] 1 , σ crit [ , où σ crit = d / 2 - 2 / ( p - 1 ) est l’exposant critique.

Probabilistic well-posedness for the cubic wave equation

Nicolas Burq, Nikolay Tzvetkov (2014)

Journal of the European Mathematical Society

The purpose of this article is to introduce for dispersive partial differential equations with random initial data, the notion of well-posedness (in the Hadamard-probabilistic sense). We restrict the study to one of the simplest examples of such equations: the periodic cubic semi-linear wave equation. Our contributions in this work are twofold: first we break the algebraic rigidity involved in our previous works and allow much more general randomizations (general infinite product measures v.s. Gibbs...

Propagation of singularities for the wave equation on manifolds with corners

András Vasy (2004/2005)

Séminaire Équations aux dérivées partielles

In this talk we describe the propagation of 𝒞 and Sobolev singularities for the wave equation on 𝒞 manifolds with corners M equipped with a Riemannian metric g . That is, for X = M × t , P = D t 2 - Δ M , and u H loc 1 ( X ) solving P u = 0 with homogeneous Dirichlet or Neumann boundary conditions, we show that WF b ( u ) is a union of maximally extended generalized broken bicharacteristics. This result is a 𝒞 counterpart of Lebeau’s results for the propagation of analytic singularities on real analytic manifolds with appropriately stratified boundary,...

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