带初级毛的黑洞的微扰：时间演化、准正规模式与灰体因子
Perturbations of black holes with primary hair: time evolutions, quasinormal modes and greybody factors
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中文总结 AI 辅助
该研究在 shift 对称超越 Horndeski 引力框架下，分析带初级标量毛黑洞的引力微扰，通过时域与频域演化、QNM 谱及灰体因子计算，探究其响应特性与稳定性。
中文摘要 AI 辅助
本工作研究 shift 对称超越 Horndeski 引力中携带初级标量毛的黑洞的引力微扰。通过聚焦轴向扇区，我们研究微扰方程的几何结构，并在物理度规和有效度规描述中进行时域演化，以量化不同毛的解的响应特性差异。在频域中，我们探究物理度规形式下的 QNM（准正规模式）谱，从而验证并扩展了有效度规方法中已有的近似计算；我们还计算了对应的灰体因子和吸收截面。最后，我们利用有效势的局域形变作为诊断，判断准正规频率与灰体因子可观测量的相对稳定性。
英文摘要
In this work we study gravitational perturbations of black holes carrying primary scalar hair in shift-symmetric beyond-Horndeski gravity. By focusing on the axial sector, we study the geometric structure of the perturbation equations and perform time-domain evolutions both in the physical and in the effective metric descriptions, in order to quantify differences in the response characteristics of solutions with different hair. In the frequency domain, we then explore the QNM spectrum in the physical-metric formulation, thus verifying and extending existing approximate calculations derived in the effective-metric approach. We also compute the corresponding greybody factors and absorption cross-sections. Finally, we use localized deformations of the effective potential as a diagnostic of the relative stability of quasinormal frequencies and greybody-factor observables.
