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arXiv 1003.4344gr-qchep-thmath-phmath.MP
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具有四极矩的内外度规

Exterior and interior metrics with quadrupole moment

Hernando Quevedo

摘要:

我们提出的恩斯特潜在的爱因斯坦的真空场方程,包含作为任意参数的总质量,角动量和四极矩的旋转质量分布的精确解的线元素。我们表明,在缓慢旋转和轻微变形的配置的极限情况下,存在一个坐标变换,与近似Hartle解的精确解。结果表明,该近似解可以与具有物理合理性质的内部理想流体解光滑匹配。这打开了考虑的四极矩作为一个额外的物理自由度,可用于搜索一个现实的精确解,代表内部和外部的引力场所产生的自引力轴对称分布的质量的完美流体在静止旋转的可能性。

英文摘要:

We present the Ernst potential and the line element of an exact solution of Einstein's vacuum field equations that contains as arbitrary parameters the total mass, the angular momentum, and the quadrupole moment of a rotating mass distribution. We show that in the limiting case of slowly rotating and slightly deformed configuration, there exists a coordinate transformation that relates the exact solution with the approximate Hartle solution. It is shown that this approximate solution can be smoothly matched with an interior perfect fluid solution with physically reasonable properties. This opens the possibility of considering the quadrupole moment as an additional physical degree of freedom that could be used to search for a realistic exact solution, representing both the interior and exterior gravitational field generated by a self-gravitating axisymmetric distribution of mass of perfect fluid in stationary rotation.

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