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arXiv 0903.0799math.AP
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散焦径向非线性wave equations的整体逐点衰减估计

Global pointwise decay estimates for defocusing radial nonlinear wave equations

Roger Bieli, Nikodem Szpak

摘要:

本文证明了一类在$n=3$维限制于球对称的散焦半线性波动方程的整体点态衰减估计。该技术是基于一个保角变换和一个适当的选择调整到非线性映射。作为结果,我们得到了任意大的柯西数据的解决方案的逐点界,提供的解决方案存在的整体。衰减率与小数据的衰减率相同,因此似乎是最佳的。提出了一种超越球对称性的推广。

英文摘要:

We prove global pointwise decay estimates for a class of defocusing semilinear wave equations in $n=3$ dimensions restricted to spherical symmetry. The technique is based on a conformal transformation and a suitable choice of the mapping adjusted to the nonlinearity. As a result we obtain a pointwise bound on the solutions for arbitrarily large Cauchy data, provided the solutions exist globally. The decay rates are identical with those for small data and hence seem to be optimal. A generalization beyond the spherical symmetry is suggested.

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