Radiation-vacuum density equality
= Radiation-vacuum density equality
{title2=$1+z_{r\Lambda}=(\Omega_{\Lambda0}/\Omega_{r0})^{1/4}$}
The equality of a radiation density proportional to $(1+z)^4$ and a constant vacuum density. It is only a crossing of two components. Matter can dominate both at this epoch, so radiation-vacuum equality need not mark a change in the universe's dominant component.