\frac{\text{d } c^*}{\text{d } B/R} = \frac{-1}{n}\left( \frac{\Omega}{\Lambda}\right)^2 \left[ s + \psi \rho_{C}^{*}-\psi d^{*}\rho_{C}^{*'} \right] \frac{\partial d^{*}}{\partial B/R}