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|η=0…70
If H=67.15 at a=1, the age of this universe at a=1 would be t=7.280657
The Hubbleradius rH & the Particlehorizon rP coincide and grow with 2c
Gray dashed curves: worldlines of objects comoving with the Hubbleflow
⎆ | Static | Big Crunch | Big Rip | Radiation | Matter | Milne | Mixed
