Friedmann equation
= Friedmann equation
{c}
{wiki=Friedmann_equations}
$H=\dot a/a$, a fluid with $P=w\rho$ has $\rho\propto a^{-3(1+w)}$, and $\rho_{\rm crit}=3c^2H^2/(8\pi G)$.
= Friedmann equation
{c}
{wiki=Friedmann_equations}
$H=\dot a/a$, a fluid with $P=w\rho$ has $\rho\propto a^{-3(1+w)}$, and $\rho_{\rm crit}=3c^2H^2/(8\pi G)$.