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arXiv 2407.14909gr-qchep-th
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零超曲面上的新闻张量

News tensor on null hypersurfaces

Francisco Fernández-Álvarez

AI总结:

本文给出四维零超曲面上新闻张量的几何定义,在共形爱因斯坦场方程下正确描述无穷远辐射分量,并推导格罗赫张量的广义输运方程,探讨内部与无穷远差异对新闻作用的影响。

摘要:

本文提出了四维时空零超曲面上新闻张量的几何定义。当共形爱因斯坦场方程成立时,该新闻张量在任意共形规范下,对于宇宙学常数为零的情形,能在无穷远处给出重标度外尔张量辐射分量的正确表达式。此外,还推导了格罗赫张量的广义输运方程。本文回顾了时空内部零超曲面与宇宙学常数为零的零无穷远之间的重要差异,并讨论了这些差异对新闻作用的影响。

英文摘要:

A geometric definition of news tensor on null hypersurfaces in four space-time dimensions is presented. When the conformal Einstein field equations hold, this news tensor yields the correct expression for the radiative components of the rescaled Weyl tensor at infinity with vanishing cosmological constant in arbitrary conformal gauge. Also, a generalised transport equation for the Geroch tensor is derived. Important differences between null hypersurfaces in the bulk of the space-time and null infinity with vanishing cosmological constant are reviewed, and their impact on the role of the news is discussed.

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。

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