The
Standard Dust Models (Λ=0)
•Have a
Newtonian Analog:
–Replace x by comoving value r using the scale factor R, x = Rr, and
express density in terms of its value at the present epoch ρ = ρ0R-3, then:
–Which matches eq. 7.1 for dust and lambda=0. Multiplying by the
derivative of R and integrating gives us essentially eq. 7.2
