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Friedmann<br />
ȧ<br />
a 2<br />
= 8π 3 G Nρ − k a 2 + Λ 3<br />
= H 2 0<br />
<br />
Ωrad<br />
a 4<br />
+ Ω m<br />
a 3<br />
+ Ω k<br />
a 2 +<br />
Ω <br />
DE<br />
a −3(1+w)<br />
• <br />
<br />
<br />
˙ρ = −3H(p + ρ) =−3H(w + 1)ρ<br />
ρ = ρ 0 a −3(w+1) , ρa 3 = ρ 0 a −3w<br />
ȧ ∝ a −(1+3w)/2<br />
ä ∝−(1 + 3w) > 0 → w