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arXiv 1008.2633math.AP
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有界区域上能量临界二维wave equation的Lichartz型估计和适定性

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

S. Ibrahim, R. Jrad

摘要:

研究了二维有界光滑区域Ω上H1临界半线性波动方程的Dirichlet或Neumann边界条件Cauchy问题的适定性.首先,我们证明了一个适当的Eschenhartz型估计使用的$L^q$谱投影估计的拉普拉斯算子。我们的证明遵循Burq-Lebeau-Planchon [5]。然后,我们证明了当能量低于或等于由尖锐的Moser-Trudinger不等式给出的阈值时的整体适定性。最后,在超临界的情况下,我们证明了不稳定的结果,使用有限的传播速度和相关的ODE振荡数据的定量研究。

英文摘要:

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 Ω. 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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