The Standard Dust Models (Λ=0)
	• Dynamics: using the previous equations, we can rewrite eq. 7-18: • And in the limit of large values of R, we get: • This is easy to interpret. – When Ω0 < 1, universe is open, hyperbolic, and expands to infinity with finite velocity. – When Ω0 > 1, universe is closed, spherical, and eventually collapse after reaching a maximum size after a time: