Dynamics and observational signatures of shell-like black hole mimickers,Physical Review D

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Dynamics and observational signatures of shell-like black hole mimickers
Physical Review D ( IF 4.6 ) Pub Date : 2021-12-02 , DOI: 10.1103/physrevd.104.124011
Ulf Danielsson ₁ , Luis Lehner ₂ , Frans Pretorius ₃

Affiliation

We undertake the task of studying the nonlinear dynamics of quantum gravity motivated alternatives to black holes that in the classical limit appear as ultracompact shells of matter. We develop a formalism that should be amenable to numerical solution in generic situations. For a concrete model, we focus on the spherically symmetric anti-de Sitter (AdS) black bubble—a shell of matter at the Buchdahl radius separating a Schwarzschild exterior from an AdS interior. We construct a numerical code to study the radial dynamics of and accretion onto AdS black bubbles, with exterior matter provided by scalar fields. In doing so, we develop numerical methods that could be extended to future studies beyond spherical symmetry. Regarding AdS black bubbles in particular, we find that the original prescription for the internal matter fluxes needed to stabilize the black bubble is inadequate in dynamical settings, and we propose a two-parameter generalization of the flux model to fix this. To allow for more efficient surveys of parameter space, we develop a simpler numerical model adapted to spherically symmetric bubble dynamics. We identify regions of parameter space that do allow for stable black bubbles and moreover allow control to a desired end state after an accretion episode. Based on these results, and evolution of scalar fields on black bubble backgrounds, we speculate on some observational consequences if what are currently presumed to be black holes in the Universe were actually black bubbles.

中文翻译：

壳状黑洞模拟物的动力学和观测特征

我们承担的任务是研究由量子引力驱动的替代黑洞的非线性动力学，这些黑洞在经典极限中表现为超紧凑的物质壳。我们开发了一种形式主义，它应该适用于一般情况下的数值解。对于具体模型，我们专注于球对称反德西特 (AdS) 黑色气泡 — 布赫达尔半径处的物质外壳，将 Schwarzschild 外部与 AdS 内部分隔开。我们构建了一个数值代码来研究 AdS 黑色气泡的径向动力学和吸积，外部物质由标量场提供。在这样做的过程中，我们开发了可以扩展到球对称以外的未来研究的数值方法。特别是关于 AdS 黑色气泡，我们发现稳定黑色气泡所需的内部物质通量的原始处方在动力学设置中是不够的，我们提出了通量模型的双参数泛化来解决这个问题。为了更有效地调查参数空间，我们开发了一个更简单的数值模型，适用于球对称气泡动力学。我们确定了允许稳定黑色气泡的参数空间区域，而且允许在吸积事件后控制到所需的最终状态。基于这些结果，以及黑色气泡背景上标量场的演变，我们我们开发了一个更简单的数值模型，适用于球对称气泡动力学。我们确定了允许稳定黑色气泡的参数空间区域，而且允许在吸积事件后控制到所需的最终状态。基于这些结果，以及黑色气泡背景上标量场的演变，我们我们开发了一个更简单的数值模型，适用于球对称气泡动力学。我们确定了允许稳定黑色气泡的参数空间区域，而且允许在吸积事件后控制到所需的最终状态。基于这些结果，以及黑色气泡背景上标量场的演变，我们如果目前被认为是宇宙中的黑洞实际上是黑色气泡，则推测一些观察结果。

更新日期：2021-12-02

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