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I really wonder how to extract the equation of stats [itex]w=\frac P \rho[/itex] from the Friedmann equations and how one can see that dark energy needs to have [itex]w<-\frac13[/itex] and why does [itex]w<-1[/itex] violate the null energy condition.

Thanks in advance,

madster

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# Null Energy condition

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