Matter-vacuum density equality
= Matter-vacuum density equality
{title2=$1+z_{m\Lambda}=(\Omega_{\Lambda0}/\Omega_{m0})^{1/3}$}
For conserved <pressureless matter> and a true <cosmological constant>, equality follows by comparing the matter density proportional to $(1+z)^3$ with the constant vacuum density. This is not the onset of accelerated expansion: in a matter-plus-vacuum model acceleration starts at $\rho_m=2\rho_\Lambda$.