Evolution of the cosmic horizons in a photon dominated universe (Ωr=1)
in proper (r) & comoving (R) distances; plot range: r&R=0..70, t=0..70
Gray dashed curves: worldlines of objects comoving with the Hubbleflow
The Hubbleradius rH & the particlehorizon rP coincide and grow with 2c
If H=67.15 at a=1, the age of this universe at a=1 would be t=7.280657
Other diagrams: pure matter (Ωm=1) and mixed component (Ω=1) universes
