标题： Gibbons-Maeda-Garfinkle-Horovits-Strominger黑洞周围的引力和电磁扰动的灰体因子 显示英文标题

标题： Grey-body factors for gravitational and electromagnetic perturbations around Gibbons-Maeda-Garfinkle-Horovits-Strominger black holes

摘要： 尽管弦理论黑洞（由著名的Gibbons-Maeda-Garfinkle-Horowitz-Strominger (GMGHS) 解描述）中的测试标量场的灰体因子已在文献中进行了分析，但对于引力子尚不存在类似的分析，这可能是因为扰动方程的复杂性。 在这项研究中，我们利用已知的准正模数据以及准正模与灰体因子之间的关系，推导出稀疏黑洞引力和电磁扰动的这些因子。 我们的研究表明，随着黑洞电荷接近其极限值，灰体因子会因稀疏参数而显著抑制。 在存在稀疏场的情况下，扰动的轴向和极化通道之间的同谱性被打破，从而导致不同类型扰动具有不同的灰体因子。 显示英文摘要

摘要： While grey-body factors for a test scalar field in stringy black holes described by the renowned Gibbons-Maeda-Garfinkle-Horowitz-Strominger (GMGHS) solution have been analyzed in the literature, no such analysis exists for gravitons, likely due to the complexity of the perturbation equations. In this study, we utilize known data on quasinormal modes and the relationship between quasinormal modes and grey-body factors to derive these factors for gravitational and electromagnetic perturbations of the dilaton black hole. Our findings indicate that grey-body factors are significantly suppressed by the dilaton parameter as the black hole's charge approaches its extreme value. The iso-spectrality between axial and polar channels of perturbations is broken in the presence of the dilaton field, which leads to different grey-body factors for different types of perturbations.