The Carter constant is a conserved quantity for motion around black holes in the general relativistic formulation of gravity. Carter's constant was derived for a spinning, charged black hole by Australian theoretical physicist Brandon Carter in 1968. Carter's constant along with the energy, axial angular momentum, and particle rest mass provide the four conserved quantities necessary to uniquely determine all orbits in the Kerr-Newman spacetime (even those of charged particles).
Read more about Carter Constant: Formulation, As Generated By A Killing Tensor, Schwarzschild Limit, See Also
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