论文标题
邦迪新闻De Sitter时空
Bondi news in de Sitter space-time
论文作者
论文摘要
观察结果表明，具有积极宇宙常数的模型更适合描述我们的宇宙。该手稿的目的是研究Sitter时空中的重力场。为了实现这一目标，De Sitter指标以Bondi Sachs的形式编写，并且在存在$λ$的情况下为这种形式的指标求解了爱因斯坦方程。另一方面，定义为DE Sitter度量标准定义了一个零四位，并通过使用一般变换获得了邦迪仪表中的形式。然后，使用Penrose于1963年首次提出的Bondi News的坐标独立概念获得了邦迪新闻的新结果。
Observations have shown that a model with a positive cosmological constant is more appropriate to describe our universe. The aim of this manuscript is to study the gravitational fields in de Sitter space-time. To achieve this goal, de Sitter metric is written in Bondi Sachs form and the Einstein equations are solved for this form of the metric in presence of $Λ$. On the other hand, a null tetrad is defined for the de Sitter metric and its form in Bondi gauge is obtained by using the general transformation. Then a new result for the Bondi news in de Sitter background is obtained, using the coordinate independent notion of Bondi news which was first presented by Penrose in 1963.
