The Kerr metric is considered in a synchronous frame of reference obtained by using proper time and initial conditions for particles that freely move along a certain set of trajectories as coordinates. Modifying these coordinates in a certain way (keeping their interpretation as initial values at large distances), we still have a synchronous frame and the direct analogue of the Lemaitre metric, the singularities of which are exhausted by the physical Kerr singularity (the singularity ring).

中文翻译：

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关于同步参考框架中的 Kerr 度量

克尔度量是在一个同步的参考系中考虑的，该参考系是通过使用沿着特定轨迹集自由移动的粒子的适当时间和初始条件作为坐标获得的。以某种方式修改这些坐标（将它们解释为远距离的初始值），我们仍然有一个同步框架和 Lemaitre 度量的直接模拟，其奇点被物理克尔奇点（奇点环）耗尽.