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arXiv 1606.01475gr-qc
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具有Killing矢量的四维真空时空的新守恒流

New conserved currents for vacuum space-times in dimension four with a Killing vector

Alfonso García-Parrado Gómez-Lobo

摘要:

本文提出了一族新的具有Killing矢量的真空时空守恒流。电流是由Mars-Simon张量的超能张量构造的,利用前者的正性性质,我们发现与电流相关的守恒电荷在某些情况下具有自然的正性性质。考虑到Mars-Simon张量在克尔解的局部和半局部特征中所起的作用,本工作中提出的电流对于构建表征克尔初始数据的非负标量(在文献中称为非克尔性)是有用的,这些非负标量另外是守恒电荷。

英文摘要:

A new family of conserved currents for vacuum space-times with a Killing vector is presented. The currents are constructed from the superenergy tensor of the Mars-Simon tensor and using the positivity properties of the former we find that the conserved charges associated to the currents have natural positivity properties in certain cases. Given the role played by the Mars-Simon tensor in local and semi-local characterisations of the Kerr solution, the currents presented in this work are useful to construct non-negative scalar quantities characterising Kerr initial data (known in the literature as non-Kerrness) which in addition are conserved charges.

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