Painleve-Gullstrand Coordinates for the Kerr Solution

Details Painleve-Gullstrand Coordinates for the Kerr Solution Painleve-Gullstrand Coordinates for the Kerr Solution

2008-05-02

arxiv.org/abs/0805.0206v2

Gen. Rel. Grav. 41 (2009) 2579-2586

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

6 pages; v2: new section, matches final published version

Scientific paper

10.1007/s10714-009-0781-2

We construct a coordinate system for the Kerr solution, based on the zero angular momentum observers dropped from infinity, which generalizes the Painleve-Gullstrand coordinate system for the Schwarzschild solution. The Kerr metric can then be interpreted as describing space flowing on a (curved) Riemannian 3-manifold. The stationary limit arises as the set of points on this manifold where the speed of the flow equals the speed of light, and the horizons as the set of points where the radial speed equals the speed of light. A deeper analysis of what is meant by the flow of space reveals that the acceleration of free-falling objects is generally not in the direction of this flow. Finally, we compare the new coordinate system with the closely related Doran coordinate system.

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