We study scattering of short Gaussian pulses of axial gravitational waves by a black hole that has swallowed one or more global monopoles. We show how the response of the black hole to the impinging pulses depends both on the number of monopoles the black hole has swallowed and on the symmetry breaking scale of the model which gave rise to the monopoles. We determine the corresponding quasinormal modes that get excited by the impinging pulses and that get imprinted in the black hole's response to the pulses. These modes are also expected to show up in various other dynamical processes such as the ringdown phase of a binary black hole merger in case at least one of the companion black holes of the binary has swallowed one or more global monopoles.

中文翻译：

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单极黑洞和 QNM 对轴向引力波脉冲的散射：一种半解析方法

我们研究了吞噬一个或多个全球单极子的黑洞对轴向引力波的短高斯脉冲的散射。我们展示了黑洞对撞击脉冲的响应如何取决于黑洞吞噬的单极子数量以及产生单极子的模型的对称破坏尺度。我们确定了相应的准正规模式，这些模式被撞击脉冲激发并印在黑洞对脉冲的响应中。这些模式也有望出现在各种其他动力学过程中，例如双黑洞合并的衰荡阶段，以防双星的至少一个伴生黑洞吞噬了一个或多个全球单极子。