论文标题
来自奇点的回声
Echoes from a singularity
论文作者
论文摘要
尽管宇宙审查制度的猜想指出，时空的奇异性必须通过事件视野隐藏在渐近观察者身上，但裸奇异物可以作为适当初始条件下引力崩溃的最终产物形成，因此如何在观察上与标准的黑洞间距有关的观察性区别于重要的问题。在本文中，我们试图通过研究轴向重力扰动下的Janis-Newman-Winicour（JNW）裸奇异性的环形曲线来解决这个问题。 JNW时空具有表面状的裸露奇异性，在没有标量场的情况下，通过无质量标量场来源，并减少了Schwarzschild溶液。我们表明，对于标量场的低强度，响down曲线由回声支配，随着场的强度的增加，它们会降低，以产生JNW时空的特征性准模式频率。
Though the cosmic censorship conjecture states that spacetime singularities must be hidden from an asymptotic observer by an event horizon, naked singularities can form as the end product of a gravitational collapse under suitable initial conditions, so the question of how to observationally distinguish such naked singularities from standard black hole spacetimes becomes important. In the present paper, we try to address this question by studying the ringdown profile of the Janis-Newman-Winicour (JNW) naked singularity under axial gravitational perturbation. The JNW spacetime has a surfacelike naked singularity that is sourced by a massless scalar field and reduces to the Schwarzschild solution in absence of the scalar field. We show that for low strength of the scalar field, the ringdown profile is dominated by echoes which mellows down as the strength of the field increases to yield characteristic quasinormal mode frequency of the JNW spacetime.
