The Standard Dust Models (Λ=0)
The Flatness Problem
Can determine how Hubble’s “constant” changes with time, from eq.
7-20 and writing R = (1+z)-1:
Similarly for Omega, using the general definition Ω=8πGρ/3H2, and
expressing the density ρ = ρ0(1+z)3, then
And rewriting...
Notice the behavior at high z.  This is the origin of the problem.