Wednesday, April 15, 2015

cosmic acceleration maxed out

what equation of state parameter and what density would a cosmic fluid need to have for producing a total deceleration larger than 1 or more negative than -1?

1 comment:

  1. for a flat universe there is the funny relation $2(1+q)=3(1+w)$ between equation of state $w$ and deceleration $q$. $q<-1$ would require $w<-1$ and $q>1$ needs $w>1/3$, where the boundaries would be given by a cosmological constant and photons, respectively.