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arXiv 1704.03362gr-qc
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Schwarzschild内部的有效圈量子几何

On effective loop quantum geometry of Schwarzschild interior

Jerónimo Cortez, William Cuervo, Hugo A. Morales-Técotl, Juan C. Ruelas

摘要:

圈量子宇宙学在解决齐次模型的经典奇异性方面的成功使其应用于经典Schwarszchild黑洞内部,它采取了齐次Kantowski-Sachs模型的形式。第一步是在纯量子力学的条件下完成的,暗示了可能的经典奇点的可穿越性,然后其他步骤是使用有效的启发式模型来完成的,这些模型捕捉了量子效应,允许更接近经典的几何描述,但避免了它的奇点。然而,在量子描述和有效描述之间建立联系的问题仍然悬而未决。在这项工作中,我们建议填补这一空白,考虑路径积分的方法来循环量子化的Kantowski-Sachs模型对应的史瓦西黑洞内部。我们表明,过渡振幅可以表示为一个路径积分的虚指数的一个有效的行动,正好符合,在一些简化的假设下,与启发式的。此外,我们进一步探讨了有效动态的后果。我们首先证明,这样的动态意味着一些相当简单的相空间变量的界限,反过来,显着的,在一个分析的方式,他们意味着各种相空间函数,在经典模型中是奇异的,现在表现良好。特别地,膨胀率、其时间导数和剪切变得有界,因此Raychaudhuri方程是逐项有限的,从而解决了经典测地线同余的奇异性。此外,所有有效的标量多项式不变量原来是有界的。

英文摘要:

The success of loop quantum cosmology to resolve classical singularities of homogeneous models has led to its application to the classical Schwarszchild black hole interior, which takes the form of a homogeneous Kantowski-Sachs model. The first steps of this were done in pure quantum mechanical terms, hinting at the traversable character of the would-be classical singularity, and then others were performed using effective heuristic models capturing quantum effects that allowed a geometrical description closer to the classical one but avoided its singularity. However, the problem of establishing the link between the quantum and effective descriptions was left open. In this work, we propose to fill in this gap by considering the path-integral approach to the loop quantization of the Kantowski-Sachs model corresponding to the Schwarzschild black hole interior. We show that the transition amplitude can be expressed as a path integration over the imaginary exponential of an effective action which just coincides, under some simplifying assumptions, with the heuristic one. Additionally, we further explore the consequences of the effective dynamics. We prove first that such dynamics imply some rather simple bounds for phase-space variables, and in turn, remarkably, in an analytical way, they imply that various phase-space functions that were singular in the classical model are now well behaved. In particular, the expansion rate, its time derivative, and the shear become bounded, and hence the Raychaudhuri equation is finite term by term, thus resolving the singularities of classical geodesic congruences. Moreover, all effective scalar polynomial invariants turn out to be bounded.

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