Rigidly rotating ZAMO surfaces in the Kerr spacetime

@inproceedings{Frolov2014RigidlyRZ,
  title={Rigidly rotating ZAMO surfaces in the Kerr spacetime},
  author={Andrei V. Frolov and Valeri P. Frolov},
  year={2014}
}
A stationary observer in the Kerr spacetime has zero angular momentum if his/her angular velocity ω has a particular value, which depends on the position of the observer. Worldlines of such zero angular momentum observers (ZAMOs) with the same value of the angular velocity ω form a three dimensional surface, which has the property that the Killing vectors generating time translation and rotation are tangent to it. We call such a surface a rigidly rotating ZAMO surface. This definition allows a… 

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