Strichartz type estimates and the wellposedness of an energy critical 2D wave equation in a bounded domain

Details Strichartz type estimates and the wellposedness of an energy critical 2D wave equation in a bounded domain Strichartz type estimates and the wellposedness of an energy critical 2D wave equation in a bounded domain

2010-08-16

arxiv.org/abs/1008.2633v1

Mathematics

Analysis of PDEs

Scientific paper

We study the well-posedness of the Cauchy problem with Dirichlet or Neumann boundary conditions associated to an H 1 -critical semilinear wave equation on a smooth bounded 2D domain {\Omega}. First, we prove an appropriate Strichartz type estimate using the $L^q$ spectral projector estimates of the Laplace operator. Our proof follows Burq-Lebeau-Planchon [5]. Then, we show the global well-posedness when the energy is below or at the threshold given by the sharp Moser-Trudinger inequality. Finally, in the supercritical case, we prove an instability result using the finite speed of propagation and a quantitative study of the associated ODE with oscillatory data.

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