Fase 0
①
KERR
a = J/Mc:spin 0 ≤ a ≤ M
r±:M ± √(M²−a²)
Ergosfera:r_e = M+√(M²−a²cos²θ)
ISCO (a=0):6M
ISCO (a=M):M (pro)
η Penrose:≤ 29%
Roy Kerr, 1963
M87*: a ≈ 0.9M
Sgr A*: a ≈ 0.5M
Ring singularity: r=0,θ=π/2
M87*: a ≈ 0.9M
Sgr A*: a ≈ 0.5M
Ring singularity: r=0,θ=π/2