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snorkack
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Schwarzschild black holes were discovered over 100 years ago, in 1915.
Quite soon, in a couple years (by 1916...1918), charged Reissner-Nordström holes were discovered.
Yet rotating black holes were only discovered by Kerr in 1963 - 48 years after Schwarzschild holes.
Why? What was known about rotating black holes through the 48 years in the meantime, in 1920s to 1950s?
Also, while rotating and charged, Newman holes were discovered by 1965, Kerr and Newman holes are axisymmetric.
What, if anything, is known about rotating black holes with non-axisymmetric interior?
Quite soon, in a couple years (by 1916...1918), charged Reissner-Nordström holes were discovered.
Yet rotating black holes were only discovered by Kerr in 1963 - 48 years after Schwarzschild holes.
Why? What was known about rotating black holes through the 48 years in the meantime, in 1920s to 1950s?
Also, while rotating and charged, Newman holes were discovered by 1965, Kerr and Newman holes are axisymmetric.
What, if anything, is known about rotating black holes with non-axisymmetric interior?