12.07.2015 Views

Astroparticle Physics

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8.7 Nature of Solutions to the Friedmann Equation 185One can then define the critical density ϱ c byϱ c = 3H 2(8.33)8πGand express the energy density ϱ by giving the ratio Ω,Ω parameterΩ = ϱ ϱ c. (8.34)Using this with H = Ṙ/R, (8.32) becomesk = R 2 (Ω − 1)H 2 . (8.35)So, if Ω

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