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arXiv 1009.4665gr-qcastro-ph.COastro-ph.GA
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Schwarzschild微扰的模式耦合:衰荡频率

Mode coupling of Schwarzschild perturbations: Ringdown frequencies

Enrique Pazos, David Brizuela, Jose M. Martin-Garcia, Manuel Tiglio

摘要:

在线性微扰理论中,黑洞通过著名的准正规模谱衰减到它们的最终定态。在这里,我们数值研究是否非线性改变这种情况。为此目的,我们研究规范不变的二阶引力扰动引起的自耦合的史瓦西黑洞的线性扰动的振铃频率。我们这样做,通过高精度模拟在时域中的一阶和二阶Regge-Wheeler-Zerilli型方程,为各种初始数据集。我们考虑一阶偶宇称$(\ell=2,m=\pm 2)$扰动和奇宇称$(\ell=2,m=0)$扰动,以及它们通过自耦合产生的所有多极子。对于所有这些和所有考虑的初始数据集,我们发现-在文献中以前的预测相反-二阶扰动的数值衰减频率是相同的线性化理论,我们解释了观察到的行为。这将特别表明,在建模或搜索振铃引力波时,适当地包括标准准正规模已经考虑到非线性效应。

英文摘要:

Within linearized perturbation theory, black holes decay to their final stationary state through the well-known spectrum of quasinormal modes. Here we numerically study whether nonlinearities change this picture. For that purpose we study the ringdown frequencies of gauge-invariant second-order gravitational perturbations induced by self-coupling of linearized perturbations of Schwarzschild black holes. We do so through high-accuracy simulations in the time domain of first and second-order Regge-Wheeler-Zerilli type equations, for a variety of initial data sets. We consider first-order even-parity $(\ell=2,m=\pm 2)$ perturbations and odd-parity $(\ell=2,m=0)$ ones, and all the multipoles that they generate through self-coupling. For all of them and all the initial data sets considered we find that ---in contrast to previous predictions in the literature--- the numerical decay frequencies of second-order perturbations are the same ones of linearized theory, and we explain the observed behavior. This would indicate, in particular, that when modeling or searching for ringdown gravitational waves, appropriately including the standard quasinormal modes already takes into account nonlinear effects.

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