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arXiv 2009.01756gr-qcmath-phmath.MP
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一种适用于Schwarzschild黑洞几何的视界穿透坐标系家族

A Family of Horizon-penetrating Coordinate Systems for the Schwarzschild Black Hole Geometry with Cauchy Temporal Functions

University of Granada(格拉纳达大学);University of Bonn(波恩大学)

Christian Röken

AI总结:

本文提出了一种适用于Schwarzschild黑洞几何的视界穿透坐标系家族,利用Cauchy时间函数和度量积结构,用于研究黑洞内外区域的时空演化和初始数据集构造。

摘要:

我们引入了一种新的视界穿透坐标系家族,用于Schwarzschild黑洞几何,其时间坐标为Cauchy时间函数,其等值面是光滑的、渐近平坦的类时Cauchy超曲面。此类坐标系适用于研究Schwarzschild黑洞几何的外区和内区物质和辐射场的时序演化,而相应的分层可以作为全局超曲面发展的初始数据集。为此,我们提出了一种显式方法,利用Penrose图的几何结构和内在结构,从而依赖于相应的度量积结构。作为例子,我们考虑一个积分代数S型函数作为确定此类坐标系的基础。最后,我们将结果推广到Reissner-Nordström黑洞几何,直至Cauchy视界。本文展示的几何构造过程可以适应于生成具有相同度量积结构的其他各类时空的类似坐标系。

英文摘要:

We introduce a new family of horizon-penetrating coordinate systems for the Schwarzschild black hole geometry featuring time coordinates that are Cauchy temporal functions for which the level sets are smooth, asymptotically flat, spacelike Cauchy hypersurfaces. Coordinate systems of this kind are well suited for the study of the temporal evolution of matter and radiation fields in the joined exterior and interior regions of the Schwarzschild black hole geometry, whereas the associated foliations can be employed as initial data sets for the globally hyperbolic development under the Einstein flow. For their construction, we formulate an explicit method that utilizes the geometry of - and structures inherent in - the Penrose diagram of the Schwarzschild black hole geometry, thus relying on the corresponding metrical product structure. As an example, we consider an integrated algebraic sigmoid function as the basis for the determination of such a coordinate system. Finally, we generalize our results to the Reissner-Nordström black hole geometry up to the Cauchy horizon. The geometric construction procedure presented here can be adapted to yield similar coordinate systems for various other spacetimes with the same metrical product structure.

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