Solution
= Solution
The <scale factor> of the <cosmological domain wall network> is $a\propto t^2$, so $\ddot a>0$: \b[the expansion accelerates]. Equivalently the <Friedmann acceleration equation> has $\rho+3P=\rho(1+3w)=-\rho<0$ for $w=-2/3$.
= Solution
The <scale factor> of the <cosmological domain wall network> is $a\propto t^2$, so $\ddot a>0$: \b[the expansion accelerates]. Equivalently the <Friedmann acceleration equation> has $\rho+3P=\rho(1+3w)=-\rho<0$ for $w=-2/3$.