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arXiv 1402.3879math.AP
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双曲空间上的半线性移位Wave Equation及其在${\mathbb R}^2$上的五次Wave Equation上的应用

A Semi-linear Shifted Wave Equation on the Hyperbolic Spaces with Application on a Quintic Wave Equation on ${\mathbb R}^2$

Ruipeng Shen, Gigliola Staffilani

摘要:

本文考虑双曲空间\[ \partial_t^2 u - (Δ_{{\mathbb H}^n} + ρ^2) u = - |u|^{p-1} u, \quad (x,t)\in {\mathbb H}^n \times {\mathbb R}; \]上的半线性、散焦、位移波方程,并引入Morawetz型不等式\[ \int_{-T_-}^{T_+} \int_{{\mathbb H}^n} |u|^{p+1} dμdt < C E, \],其中$E$是能量。将这个不等式与适定性理论相结合,我们可以建立一个散射的结果与初始数据在$H^{1/2,1/2} \times H^{1/2,-1/2}({\mathbb H}^n)$如果$2 \leq n \leq 6$和$1<p<p_c = 1+ 4/(n-2)$的解决方案。作为另一个应用,我们证明了五次波动方程$\partial_t^2 u - Δu = - |u|^4 u$的解在${\mathbb R}^2$上散射,如果它的初始数据是径向的,并且满足条件\[ |\nabla u_0 (x)|, |u_1 (x)| \leq A(|x|+1)^{-3/2-\varepsilon};\quad |u_0 (x)| \leq A(|x|)^{-1/2-\varepsilon};\quad \varepsilon >0. \]

英文摘要:

In this paper we consider a semi-linear, defocusing, shifted wave equation on the hyperbolic space \[ \partial_t^2 u - (Δ_{{\mathbb H}^n} + ρ^2) u = - |u|^{p-1} u, \quad (x,t)\in {\mathbb H}^n \times {\mathbb R}; \] and introduce a Morawetz-type inequality \[ \int_{-T_-}^{T_+} \int_{{\mathbb H}^n} |u|^{p+1} dμdt < C E, \] where $E$ is the energy. Combining this inequality with a well-posedness theory, we can establish a scattering result for solutions with initial data in $H^{1/2,1/2} \times H^{1/2,-1/2}({\mathbb H}^n)$ if $2 \leq n \leq 6$ and $1<p<p_c = 1+ 4/(n-2)$. As another application we show that a solution to the quintic wave equation $\partial_t^2 u - Δu = - |u|^4 u$ on ${\mathbb R}^2$ scatters if its initial data are radial and satisfy the conditions \[ |\nabla u_0 (x)|, |u_1 (x)| \leq A(|x|+1)^{-3/2-\varepsilon};\quad |u_0 (x)| \leq A(|x|)^{-1/2-\varepsilon};\quad \varepsilon >0. \]

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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