arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2104.13646gr-qcmath-phmath.MP
收藏

对Bondi-Sachs能量动量的新认识

A new look at the Bondi-Sachs energy-momentum

Jörg Frauendiener, Chris Stevens

摘要:

当零无穷大$\scri$的任意切割不在一个Bondi系统中时,如何计算它的Bondi质量?那么,什么是质量方面的正确定义呢?如何规范一个渐近平移计算切割不配备单位球度量?如果人们想计算一个已经用数值确定的时空的邦迪-萨克斯能量动量,这些都是需要回答的问题。在这样的条件下,对$\scri$的表示没有太多的控制,因此大多数可用的邦迪能量-动量公式都不适用。这篇文章的目的是提供必要的背景下,一个明显的共形不变和规范独立制定的邦迪能量动量。为此,我们引入了一个共形不变版本的GHP形式主义改写所有著名的公式。这使我们自然的定义空间的渐近翻译与其洛伦兹度量,为邦迪新闻和质量方面。在这些发展中的一个主要作用是由“共曲率”,一个自然出现的量密切相关的高斯曲率的削减~ $\scri$。

英文摘要:

How does one compute the Bondi mass on an arbitrary cut of null infinity $\scri$ when it is not presented in a Bondi system? What then is the correct definition of the mass aspect? How does one normalise an asymptotic translation computed on a cut which is not equipped with the unit-sphere metric? These are questions which need to be answered if one wants to calculate the Bondi-Sachs energy-momentum for a space-time which has been determined numerically. Under such conditions there is not much control over the presentation of $\scri$ so that most of the available formulations of the Bondi energy-momentum simply do not apply. The purpose of this article is to provide the necessary background for a manifestly conformally invariant and gauge independent formulation of the Bondi energy-momentum. To this end we introduce a conformally invariant version of the GHP formalism to rephrase all the well-known formulae. This leads us to natural definitions for the space of asymptotic translations with its Lorentzian metric, for the Bondi news and the mass-aspect. A major role in these developments is played by the "co-curvature", a naturally appearing quantity closely related to the Gauß curvature on a cut of~$\scri$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑