论文标题

朝着一致的黑白孔从物质崩溃中弹起

Towards consistent black-to-white hole bounces from matter collapse

论文作者

Achour, Jibril Ben, Brahma, Suddhasattwa, Mukohyama, Shinji, Uzan, Jean-Philippe

论文摘要

本文对弹跳黑洞几何形状的新型独立限制了。使用薄壳形式主义,该约束将一个束缚在弹跳处塌陷之星的时间样表面的最小半径上。从这个结合开始,壳始终在未捕获的区域或精确地在诱捕范围内弹跳。该约束是纯粹的运动起源,因为它从描述崩溃对象的内部和外部的几何形状之间的指标连续性下降,从而完全独立于模型。这项工作的第二部分研究了Oppenheimer-Snyder崩溃的有效扩展的条件可以描述一致的弹跳黑洞溶液。我们表明,在先前的运动学约束之上,必须满足其他动态条件才能使该模型接收明确定义的黑白孔解决方案。正如预期的那样,第二个条件证明是模型依赖性的。描述弹跳紧凑对象的模型类别的特征是恒星的三个参数(质量,初始半径和密度),两个量子参数从外部和内部几何形状的紫外线完成中降下。解决方案空间包含(1)弹跳星和(2)弹跳黑洞和(3)新的天体物理物体,它们可以在弹跳的恒星和弹跳的黑洞之间交替。最后,我们使用空间闭合的LQC技术提供了黑白孔反弹的明确结构,并讨论了在这个新框架中内部地平线的存在引起的新型特性。这个通用框架为有关这些物体的天体物理特性以及一个新的进一步发展的新平台奠定了基础。

This article presents a new model-independent constraint for bouncing black hole geometries. Using the thin shell formalism, this constraint sets a bound on the minimal allowed radius of the time-like surface of the collapsing star at the bounce. It follows from this bound that the shell always bounces in an untrapped region or precisely on a trapping horizon. This constraint is of purely kinematical origin as it descends from the continuity of the metric between the geometries describing the interior and exterior of the collapsing object so that it is completely model-independent. The second part of this work investigates the conditions under which an effective extension of the Oppenheimer-Snyder collapse can describe consistent bouncing black hole solutions. We show that on top of the previous kinematical constraint, an additional dynamical condition has to be satisfied in order for the model to admit well-defined black-to-white hole solutions. As expected, this second condition turns out to be model-dependent. The resulting class of models describing bouncing compact objects are characterized by three parameters for the star (mass, initial radius and density) and two quantum parameters descending from the UV-completion of the exterior and interior geometries. The solution space contains (1) bouncing stars and (2) bouncing black holes and (3) a new class of astrophysical objects which alternate between a bouncing star and a bouncing black hole. Finally, we provide an explicit construction of a black-to-white hole bounce using the techniques of spatially closed LQC and discuss the novel properties induced by the presence of the inner horizon in this new framework. This generic framework lays down the foundation for interesting phenomenological investigations concerning the astrophysical properties of these objects, as well as a novel platform for further developments.

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