论文标题
奇特的紧凑物体和光环不稳定性的命运
Exotic Compact Objects and the Fate of the Light-Ring Instability
论文作者
论文摘要
带有光环（LRS）的超整形物体，但没有事件地平线可以模仿其强力现象学中的黑洞（BHS）。但是这样的对象是动态可行的吗？可以从光滑的准米科夫斯基初始数据中形成的固定和轴对称性对象必须至少具有一个稳定的LR，这被认为是触发时空不稳定性的；但是它的发展和命运尚不清楚。我们使用具有任何其他已知不稳定性并引入一种新型的绝热有效潜在技术的超级抗骨星的完全非线性数值演变，我们确认LRS触发了不稳定性，确定了两种可能的命运：向非脱离的构型迁移或向BHS塌陷。在具体的示例中，我们表明，典型的迁移/倒塌时间尺度不大于$ \ sim 10^3 $轻跨时间，除非稳定的LR电位很好。我们的结果表明，LR不稳定性可有效破坏可能是合理的BH模仿者的无水平的超整形物体。
Ultracompact objects with light-rings (LRs) but without an event horizon could mimic black holes (BHs) in their strong gravity phenomenology. But are such objects dynamically viable? Stationary and axisymmetric ultracompact objects that can form from smooth, quasi-Minkowski initial data must have at least one stable LR, which has been argued to trigger a spacetime instability; but its development and fate have been unknown. Using fully non-linear numerical evolutions of ultracompact bosonic stars free of any other known instabilities and introducing a novel adiabatic effective potential technique, we confirm the LRs triggered instability, identifying two possible fates: migration to non-ultracompact configurations or collapse to BHs. In concrete examples we show that typical migration/collapse time scales are not larger than $\sim 10^3$ light-crossing times, unless the stable LR potential well is very shallow. Our results show that the LR instability is effective in destroying horizonless ultracompact objects that could be plausible BH imitators.
