User:Tokamac/sandbox


 * $$\dot{H} + H^2 = \frac{\ddot{a}}{a} = - \frac{4\pi G}{3}\left(\rho + \frac{3p}{c^2}\right).$$


 * $$T_{\mu\nu}=

\begin{pmatrix} \rho & 0 & 0 & 0 \\ 0 & \alpha\rho & 0 & 0 \\ 0 & 0 & \alpha\rho & 0 \\ 0 & 0 & 0 & \alpha\rho \end{pmatrix}$$