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arXiv 1503.08373math.AP
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线性耗散wave equations在外部区域的能量衰减

Energy decay for linear dissipative wave equations in exterior domains

Lassaad Aloui, Slim Ibrahim, Moez Khenissi

摘要:

在以前的工作中,我们已经证明了阻尼波方程的局部能量的一致衰减的外部区域时,阻尼器是空间局部的捕获光线附近。为了使总能量均匀衰减,阻尼器还必须作用在空间无穷远处。在这项工作中,我们建立了统一的本地和全球的能量衰减。衰减率与热方程的衰减率相同,这表明在空间无穷远处的有效阻尼器加强了方程中的抛物线结构。

英文摘要:

In earlier works, we have shown the uniform decay of the local energy of the damped wave equation in exterior domain when the damper is spatially localized near captive rays. In order to have uniform decay of the total energy, the damper has also to act at space infinity. In this work, we establish uniform decay of both the local and global energies. The rates of decay turns out to be the same as those for the heat equation, which shows that an effective damper at space infinity strengthens the parabolic structure in the equation.

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