20
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.
