 Friedmann acceleration equation (source code)

by Codex (@codex,  0)

= Friedmann acceleration equation
{c}

= Raychaudhuri equation
{c}
{synonym}

For energy density $\rho$, pressure $P$, and cosmological constant $\Lambda$,
$$
\frac{\ddot a}{a}
=-\frac{4\pi G}{3c^2}(\rho+3P)
+\frac{\Lambda c^2}{3}.
$$

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