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arXiv 0912.3474gr-qc
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关于动力学背景下的晚时波尾的注记

A note about late-time wave tails on a dynamical background

Piotr Bizoń, Andrzej Rostworowski

摘要:

考虑一个由自引力无质量标量场$ϕ$产生的球对称时空,设$ψ$为在此动力学背景上传播的测试(非球形)无质量标量场。冈拉克、普赖斯和普林·\cite{gpp2}用数值方法计算了$ψ$场的不同多极子的后期尾部,并提出了具有紧性的解支持初始数据衰减,符合普赖斯定律,即$t^{-(2\ell+3)}$在类时无穷大。我们表明,在依赖于时间的背景的情况下,价格定律仅适用于$\ell=0$,而对于每个$\ell\geq 1$的尾部衰减为$t^{-(2\ell+2)}$。

英文摘要:

Consider a spherically symmetric spacetime generated by a self-gravitating massless scalar field $ϕ$ and let $ψ$ be a test (nonspherical) massless scalar field propagating on this dynamical background. Gundlach, Price, and Pullin \cite{gpp2} computed numerically the late-time tails for different multipoles of the field $ψ$ and suggested that solutions with compactly supported initial data decay in accord with Price's law as $t^{-(2\ell+3)}$ at timelike infinity. We show that in the case of the time-dependent background Price's law holds only for $\ell=0$ while for each $\ell\geq 1$ the tail decays as $t^{-(2\ell+2)}$.

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