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arXiv 2005.01335math.AP
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用$L^r$ -数据对具有标度不变阻尼和质量的线性wave equation系统渐近阶的注记

Remarks on asymptotic order for the linear wave equation with the scale-invariant damping and mass with $L^r$-data

Takahisa Inui, Haruya Mizutani

摘要:

本文考虑具有尺度不变阻尼和质量的线性波动方程。已知解的全局行为取决于初始时刻$t=0$的阻尼和质量前的系数的大小。实际上,如果解很大,它满足与相应的热方程相似的衰减估计,如果解很小,它满足与修正的波动方程相似的衰减估计。在我们的前一篇文章中,我们得到了能量空间$H^1\times L^2$中系数处于波动状态时的散射结果及其渐近阶。实际上,系数的阈值依赖于初始数据的空间衰减。即,当初始数据是$L^r$($1\leq r < 2$)时,它根据$r$而变化。本文给出了$L^r$ -数据在波动区的散射结果和渐近阶,它比能量空间数据的波动区要宽。此外,我们给出了一个改进的渐近阶在我们以前的文件中获得的数据在能量空间。

英文摘要:

In the present paper, we consider the linear wave equation with the scale-invariant damping and mass. It is known that the global behavior of the solution depends on the size of the coefficients in front of the damping and mass at initial time $t=0$. Indeed, the solution satisfies the similar decay estimate to that of the corresponding heat equation if it is large and to that of the modified wave equation if it is small. In our previous paper, we obtain the scattering result and its asymptotic order for the data in the energy space $H^1\times L^2$ when the coefficients are in the wave regime. In fact, the threshold of the coefficients relies on the spatial decay of the initial data. Namely, it varies depending on $r$ when the initial data is in $L^r$ ($1\leq r < 2$). In the present paper, we will show the scattering result and the asymptotic order in the wave regime for $L^r$-data, which is wider than the wave regime for the data in the energy space. Moreover, we give an improvement of the asymptotic order obtained in our previous paper for the data in the energy space.

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