arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2105.09372gr-qc
收藏

爱因斯坦方程和零无穷远处的多极矩

The Einstein equations and multipole moments at null infinity

Jacek Tafel

摘要:

我们考虑真空度规允许共形紧化,这是光滑的scri $\mathscr{I^+}$。我们把度量写成Bondi-Sachs形式,并把它展开成逆仿射距离的幂级数$1/r$。就像在光度距离的情况下,给定新闻张量和一部分度量的初始数据,爱因斯坦方程以递归的方式定义系列的系数。这也是真实的情况下,但现在的新闻张量消失,初始数据的作用是采取多极矩,相当于矩的索恩。我们找到了度规的一种近似形式,并证明了在质量为零的情况下,质量偶极可能不为零。这样就违反了关于平稳度规的类Kerr行为的已知结果。最后,我们找到一个近似的(四极矩)邦迪萨克斯形式的克尔度规。

英文摘要:

We consider vacuum metrics admitting conformal compactification which is smooth up to the scri $\mathscr{I^+}$. We write metric in the Bondi-Sachs form and expand it into power series in the inverse affine distance $1/r$. Like in the case of the luminosity distance, given the news tensor and initial data for a part of metric the Einstein equations define coefficients of the series in a recursive way. This is also true in the stationary case however now the news tensor vanishes and the role of initial data is taken by multipole moments which are equivalent to moments of Thorne. We find an approximate form of metric and show that in the case of vanishing mass the mass dipole may be different from zero. Then the known result about the Kerr like behaviour of a stationary metric is violated. Finally we find an approximate (up to the quadrupole moment) Bondi-Sachs form of the Kerr metric.

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。

↑