吸积奇异致密天体中的准正则振铃与回声
Quasinormal Ringdown and Echoes in Accreting Exotic Compact Objects
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中文总结 AI 辅助
研究吸积奇异致密天体中准正则模和引力波回声演化，用ingoing Vaidya解建模外部时空并数值演化标量微扰，发现回声信号在吸积中被压缩抑制，回声消失是视界形成特征标志，为未来引力波观测研究动态致密天体提供框架。
中文摘要 AI 辅助
奇异致密天体（ECOs）可能产生晚期引力波（GW）回声，但足够致密且经历实际吸积的ECOs最终可能形成事件视界。我们研究了此转变过程中准正则模和GW回声的演化。用ingoing Vaidya解对外部时空建模，在所得动态背景上数值演化标量微扰。结果表明，吸积过程中回声信号逐渐被压缩和抑制，事件视界增长到吞噬反射面时回声消失，之后波形平滑趋近标准黑洞振铃。我们的结果将GW回声消失确定为视界形成的特征标志，并为未来GW观测研究动态致密天体提供了框架。
英文摘要
Exotic compact objects (ECOs) may produce late-time gravitational-wave (GW) echoes, but sufficiently compact ECOs undergoing realistic accretion may eventually form an event horizon. We investigate the evolution of quasinormal modes and GW echoes during this transition. Modeling the exterior spacetime with the ingoing Vaidya solution, we numerically evolve scalar perturbations on the resulting dynamical background. We show that the echo signal is progressively compressed and suppressed during accretion and disappears once the growing event horizon engulfs the reflecting surface, after which the waveform smoothly approaches the standard black hole ringdown. Our results identify the disappearance of GW echoes as a characteristic signature of horizon formation and provide a framework for studying dynamical compact objects with future GW observations.
