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arXiv 1905.09082gr-qc
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Kerr背景下线性自旋$s$场动力学的数值研究I.自旋$s = \pm 1, \pm 2$场的晚时拖尾

Numerical investigation of the dynamics of linear spin $s$ fields on Kerr background I. Late time tails of spin $s = \pm 1, \pm 2$ fields

Károly Csukás, István Rácz, Gábor Zsolt Tóth

摘要:

通过数值求解齐次Teukolsky方程,研究了Kerr黑洞时空中自旋$s = \pm 1$和$s = \pm 2$线性场的时间演化.所应用的数值设置是基于共形紧化和双曲型初值问题的组合。演化的基本变量扩展自旋加权球谐函数,使我们能够评估所有的角度导数解析,而在时间径向部分的膨胀系数的演变,是通过应用的方法,在四阶精确的有限差分模板中实现的线确定。关于初始化,在我们所有的调查单模激励-无论是静态或纯动态类型的初始数据-应用。在此设置的后期时间尾的行为进行了调查。由于应用保角紧化的渐近衰减率确定在三个特征位置-在域的外部通信,在事件视界和在未来的零无限-同时。最近推出的新类型的“能量”和“角动量”的平衡关系,也适用于为了证明的可行性和鲁棒性的开发的数值模式,并验证适当的实施的基本数学模型。

英文摘要:

The time evolution of linear fields of spin $s = \pm 1$ and $s = \pm 2$ on Kerr black hole spacetimes are investigated by solving the homogeneous Teukolsky equation numerically. The applied numerical setup is based on a combination of conformal compactification and the hyperbolic initial value problem. The evolved basic variables are expanded in terms of spin-weighted spherical harmonics which allows us to evaluate all the angular derivatives analytically, whereas the evolution of the expansion coefficients, in the time-radial section, is determined by applying the method of lines implemented in a fourth order accurate finite differencing stencil. Concerning the initialization, in all of our investigations single mode excitations---either static or purely dynamical type initial data---are applied. Within this setup the late time tail behavior is investigated. Due to the applied conformal compactification the asymptotic decay rates are determined at three characteristic locations---in the domain of outer communication, at the event horizon and at future null infinity---simultaneously. Recently introduced new type of `energy' and `angular momentum' balance relations are also applied in order to demonstrate the feasibility and robustness of the developed numerical schema, and also to verify the proper implementation of the underlying mathematical model.

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