Kerr solution

In[30]:=

gttKerr[M_, a_, ρ_, z_] = -fKerr ;

gtφKerr[M_, a_, ρ_, z_] = fKerr wKerr ;

gφφKerr[M_, a_, ρ_, z_] = -fKerr wKerr^2 + ρ^2 fKerr^(-1) ;

DEtildaKerr[M_, a_, ρ_] = -ΩKerr[M, a, ρ] D[EtildaKerr[M, a, ρ], ρ]/D[ΩKerr[M, a, ρ], ρ] ;

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