This corresponds to a=J/Mc in the Kerr metric. Physical values are between 0 and the mass of the black hole. Exceeding that range will create naked singularities. (J > M²)
J/Mc for this black hole
https://en.wikipedia.org/wiki/Kerr_metric#Overextreme_Kerr_solutions
This corresponds to a=J/Mc in the Kerr metric. Physical values are between 0 and the mass of the black hole. Exceeding that range will create naked singularities. (J > M²)