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arXiv 0911.4161gr-qc
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定常轴对称真空时空四阶Killing方程的形式解

Formal Solution of the Fourth Order Killing equations for Stationary Axisymmetric Vacuum Spacetimes

Jeandrew Brink

摘要:

对非克尔时空周围测地线结构的分析理解将产生一个强大的工具,可以使大质量静态紧凑物体周围的时空映射成为可能。为此,我提出了一个解析的封闭形式的组件的四阶Killing张量的稳态轴对称真空(SAV)时空。目前还不清楚SAV时空的哪个子集允许这个解。该解决方案是书面的积分表达式涉及的度量函数和两个特定的格林函数。第二个积分表达式必须为零,才能使解精确。如果第二积分不为零,则很可能已经找到了对不变量的最佳四阶近似,这种解可以被视为广义卡特常数,它提供了第四不变量的显式表达式,此外还有能量、方位角动量和静止质量,这些都与SAV时空中的测地线运动有关,无论是精确的还是近似的。我进一步评论应用这个结果建立一个通用的算法映射周围的时空紧凑的对象使用引力波天文台。

英文摘要:

An analytic understanding of the geodesic structure around non-Kerr spacetimes will result in a powerful tool that could make the mapping of spacetime around massive quiescent compact objects possible. To this end, I present an analytic closed form expression for the components of a the fourth order Killing tensor for Stationary Axisymmetric Vacuum (SAV) Spacetimes. It is as yet unclear what subset of SAV spacetimes admit this solution. The solution is written in terms of an integral expression involving the metric functions and two specific Greens functions. A second integral expression has to vanish in order for the solution to be exact. In the event that the second integral does not vanish it is likely that the best fourth order approximation to the invariant has been found. This solution can be viewed as a generalized Carter constant providing an explicit expression for the fourth invariant, in addition to the energy, azimuthal angular momentum and rest mass, associated with geodesic motion in SAV spacetimes, be it exact or approximate. I further comment on the application of this result for the founding of a general algorithm for mapping the spacetime around compact objects using gravitational wave observatories.

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