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.