Is the Kerr-Newman Solution the Only Model for Charged Rotating Black Holes?

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The discussion centers on the uniqueness of the Kerr-Newman solution as the model for charged rotating black holes. It references Michio Kaku's assertion that black holes must have an additional aspect for consistency. The conversation highlights Godel's findings, which indicate that a specific energy-momentum tensor does not guarantee a unique metric. The importance of the term "stationary" in the Kerr-Newman solution is emphasized as crucial for its validity. Overall, the dialogue questions the exclusivity of the Kerr-Newman model in light of alternative theoretical possibilities.
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I was reading Michio Kaku's book Hyperspace when I came across his statement that black holes have to have another side to be consistent. I'm curious, since Godel showed that a given energy-momentum tensor does not nessecarily produce a unique metric, why must the kerr-newman solution be the only description of a charged rotating singularity?
 
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ZelmersZoetrop said:
I was reading Michio Kaku's book Hyperspace when I came across his statement that black holes have to have another side to be consistent. I'm curious, since Godel showed that a given energy-momentum tensor does not nessecarily produce a unique metric, why must the kerr-newman solution be the only description of a charged rotating singularity?

The Kerr-Newman solution is the most general stationary, vacuum (except for EM field), asymptotically flat solution. You were missing the word "stationary," which I think is very important in making the result look reasonable.
 
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