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arXiv 1507.04264gr-qc
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关于后线性四极-四极度量

On the Post-linear Quadrupole-Quadrupole Metric

Francisco Frutos-Alfaro, Michael Soffel

摘要:

哈特尔-索恩度规定义了一个可靠的时空,用于大多数天体物理学的目的,例如模拟缓慢旋转的恒星。在求解爱因斯坦场方程时,我们在四极矩的后线性形式中加入了二阶项,以便与Blanchet在多极后闵可夫斯基框架中找到的解进行比较。我们首先推导了调和坐标下的广义Hartle-Thorne度规,并与Blanchet的后线性度规进行了比较。我们还发现了从后线性Erez-Rosen度规到我们的扩展Hartle-Thorne时空的坐标变换。众所周知,Hartle-Thorne解可以与具有适当物理性质的内部理想流体解光滑匹配。这些解决方案之间的比较提供了一个验证。很明显,为了表示理想流体的自引力(轴对称)物质分布的实际解,必须将四极矩作为一个物理参数。

英文摘要:

The Hartle-Thorne metric defines a reliable spacetime for most astrophysical purposes, for instance for the simulation of slowly rotating stars. Solving the Einstein field equations, we added terms of second order in the quadrupole moment to its post-linear version in order to compare it with solutions found by Blanchet in the frame of the multi-polar post-Minkowskian framework. We first derived the extended Hartle-Thorne metric in harmonic coordinates and then showed agreement with the corresponding post-linear metric from Blanchet. We also found a coordinate transformation from the post-linear Erez-Rosen metric to our extended Hartle-Thorne spacetime. It is well known that the Hartle-Thorne solution can be smoothly matched with an interior perfect fluid solution with physically appropriate properties. A comparison among these solutions provides a validation of them. It is clear that in order to represent realistic solutions of self-gravitating (axially symmetric) matter distributions of perfect fluid, the quadrupole moment has to be included as a physical parameter.

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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