arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2402.16484gr-qchep-th
收藏

Kodama矢量的几何起源

Geometrical origin of the Kodama vector

Shunichiro Kinoshita

AI总结:

本文揭示了Kodama矢量的几何起源,证明其性质源于闭合共形Killing-Yano 2-形式,并推广到非扭曲乘积时空及Lovelock张量各阶守恒流。

摘要:

已知诸如球对称时空等扭曲乘积时空允许Kodama矢量存在。该矢量通过收缩爱因斯坦张量提供了一个局部守恒流,即使不存在Killing矢量。此外,准局域质量、Birkhoff定理以及多种性质都与Kodama矢量密切相关。最近的研究表明,Kodama矢量的概念可以推广到三维轴对称时空,即使这些时空不是扭曲乘积。这意味着扭曲乘积可能不是时空允许Kodama矢量的必要条件。我们证明了Kodama矢量的性质源于共形Killing-Yano 2-形式。特别地,那些众所周知的允许Kodama矢量的时空具有一个闭合的共形Killing-Yano 2-形式。此外,我们证明了Kodama矢量不仅为爱因斯坦张量,也为Lovelock张量的每一阶提供了局部守恒流。

英文摘要:

It has been known that warped-product spacetimes such as spherically symmetric ones admit the Kodama vector. This vector provides a locally conserved current made by contraction of the Einstein tensor, even though there is no Killing vector. In addition, a quasilocal mass, Birkhoff's theorem and various properties are closely related to the Kodama vector. Recently, it is shown that the notion of the Kodama vector can be extended to three-dimensional axisymmetric spacetimes even if the spacetimes are not warped product. This implies that warped product may not be a necessary condition for a spacetime to admit the Kodama vector. We show properties of the Kodama vector originate from the conformal Killing-Yano 2-form. In particular, the well-known spacetimes that admit the Kodama vector have a closed conformal Killing-Yano 2-form. Furthermore, we show the Kodama vector provides local conserved currents for each order of the Lovelock tensor as well as the Einstein tensor.

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。

↑