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arXiv 1306.0317gr-qchep-thmath.AP
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$AdS_3$的全局正则不稳定性

Globally regular instability of $AdS_3$

Piotr Bizoń, Joanna Jałmużna

摘要:

考虑三维AdS引力与无质量标量场的最小耦合,数值研究了$AdS_3$时空中光滑圆对称小扰动的演化。在更高的维度,对于一个大类的扰动,我们观察到一个湍流级联的能量高频率,这需要不稳定的$AdS_3$。然而,与更高的维度相反,级联不能被黑洞的形成所终止,因为小的扰动具有低于黑洞阈值的能量。这种情况对宇宙审查员来说似乎是一个挑战。通过对级联的能谱分析,确定了复空间平面上解的解析带宽度$ρ(t)$,并外推论证了$ρ(t)$在有限时间内不为零.这提供了证据表明,湍流太弱,不能产生裸奇点,并且根据宇宙审查假说,解决方案在时间上保持全局规则。

英文摘要:

We consider three-dimensional AdS gravity minimally coupled to a massless scalar field and study numerically the evolution of small smooth circularly symmetric perturbations of the $AdS_3$ spacetime. As in higher dimensions, for a large class of perturbations, we observe a turbulent cascade of energy to high frequencies which entails instability of $AdS_3$. However, in contrast to higher dimensions, the cascade cannot be terminated by black hole formation because small perturbations have energy below the black hole threshold. This situation appears to be challenging for the cosmic censor. Analysing the energy spectrum of the cascade we determine the width $ρ(t)$ of the analyticity strip of solutions in the complex spatial plane and argue by extrapolation that $ρ(t)$ does not vanish in finite time. This provides evidence that the turbulence is too weak to produce a naked singularity and the solutions remain globally regular in time, in accordance with the cosmic censorship hypothesis.

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