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arXiv 1003.1820math.AP
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障碍物外变系数临界半线性Wave Equations解的整体存在性

Global Existence of the Critical Semilinear Wave Equations with Variable Coefficients Outside Obstacles

Yi Zhou, Ning-An Lai

摘要:

本文考虑三维空间中变系数临界半线性波动方程的外问题,证明了整体光滑解的存在性。与常系数情形类似,我们证明了能量不能集中在任何点$(t,x)\in(0,\infty)\timesΩ$。为了这个目的,遵循Ibrahim和Majdoub \cite{Ibrahim},我们使用了一个几何乘数,它接近于常系数情况下使用的著名的Morawetz乘数。然后利用黎曼几何中的比较定理对误差项进行估计。最后,利用Smith和Sogge \cite{Sogge}中的Schmidhartz不等式,得到了该方程的整体解的存在性.

英文摘要:

In this paper, we consider exterior problem of the critical semilinear wave equation in three space dimensions with variable coefficients and prove global existence of smooth solutions. Similar to the constant coefficients case, we show that the energy cannot concentrate at any point $(t,x)\in(0,\infty)\timesΩ$. For that purpose, following Ibrahim and Majdoub \cite{Ibrahim}, we use a geometric multiplier close to the well-known Morawetz multiplier used in the constant coefficients case. Then we use comparison theorem from Riemannian Geometry to estimate the error terms. Finally, using Strichartz inequality as in Smith and Sogge \cite{Sogge}, we get the global existence.

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