I am trying to calculate the age of universes with different curvatures using the Hubble constant and Friedmann equation.
What does it mean when we say that the universe started out at equipartition at the Planck time? I was told the statement implied that the energy density in matter and radiation are of order the Planck density, and the temporal and spatial curvature radii are of order the Planck length. But what can we get about the Hubble parameter $H(z)$, where $z$ is the redshift, from this statement?