Summary
A fluid source for the Kerr metric is constructed. At the static limit, the metric tensor for the source reduces to a form equivalent to the Schwarzschild interior solution. Matter constituting the source is shown to satisfy the strong-energy condition, and hence the source is physically reasonable.
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Haggag, S. A fluid source for the Kerr metric. Nuov Cim B 105, 365–370 (1990). https://doi.org/10.1007/BF02728818
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DOI: https://doi.org/10.1007/BF02728818