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arXiv 1104.4199gr-qc
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晚期Kerr尾的数值研究

Numerical investigation of the late-time Kerr tails

Istvan Racz, Gabor Zsolt Toth

摘要:

在一个结合保角紧化技术和双曲初值公式的数值框架下研究了固定Kerr背景下标量场的后期行为。应用的代码是1+(1+2),因为它是基于在角方向上使用谱方法,而在时间径向部分,四阶有限差分,以及线的方法,被应用。研究了各种定常和非定常纯多极初态的演化。渐近衰减率不仅在外部通信域中确定,而且沿事件视界和在未来零无穷远处也确定。衰减率被发现是不同的平稳和非平稳的初始数据,他们也依赖于下降的初始数据向未来零无穷大的属性。能量和角动量转移被发现在时间演化的初始阶段表现出显着不同的行为。研究了准正规振铃相和拖尾相。在尾相,在未来零无穷远处的能量和角动量损失的衰减指数小于视界处的衰减指数,这与场本身的行为一致,这意味着在尾相,落入黑洞的能量和角动量与辐射到未来零无穷远的能量和角动量相比可以忽略不计。能量和角动量平衡被用来作为我们的数值方法的可靠性的额外验证。

英文摘要:

The late-time behavior of a scalar field on fixed Kerr background is examined in a numerical framework incorporating the techniques of conformal compactification and hyperbolic initial value formulation. The applied code is 1+(1+2) as it is based on the use of the spectral method in the angular directions while in the time-radial section fourth order finite differencing, along with the method of lines, is applied. The evolution of various types of stationary and non-stationary pure multipole initial states are investigated. The asymptotic decay rates are determined not only in the domain of outer communication but along the event horizon and at future null infinity as well. The decay rates are found to be different for stationary and non-stationary initial data, and they also depend on the fall off properties of the initial data toward future null infinity. The energy and angular momentum transfers are found to show significantly different behavior in the initial phase of the time evolution. The quasinormal ringing phase and the tail phase are also investigated. In the tail phase, the decay exponents for the energy and angular momentum losses at future null infinity are found to be smaller than at the horizon which is in accordance with the behavior of the field itself and it means that at late times the energy and angular momentum falling into the black hole become negligible in comparison with the energy and angular momentum radiated toward future null infinity. The energy and angular momentum balances are used as additional verifications of the reliability of our numerical method.

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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