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arXiv 2008.03598math.AP
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二维模型凸区域上wave equation的Schmidhartz估计

Strichartz estimates for the wave equation on a 2d model convex domain

Oana Ivanovici, Gilles Lebeau, Fabrice Planchon

摘要:

我们证明了更好的Eschenhartz型估计比预期的(最佳)分散,我们在我们早期的工作中获得的二维凸模型。这是由于充分利用了我们得到的参变量中焦散线的时空局部化,尽管它们的数量像从源到边界的距离的倒数平方根一样增加。因此,我们改进了已知的波动方程的Eschenhartz估计。我们以前的参数化结构的几个改进,获得了沿途和独立的兴趣,为进一步的应用。

英文摘要:

We prove better Strichartz type estimates than expected from the (optimal) dispersion we obtained in our earlier work on a 2d convex model. This follows from taking full advantage of the space-time localization of caustics in the parametrix we obtain, despite their number increasing like the inverse square root of the distance from the source to the boundary. As a consequence, we improve known Strichartz estimates for the wave equation. Several improvements on our previous parametrix construction are obtained along the way and are of independent interest for further applications.

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