Matter-era growth with reduced gravitational clustering strength
= Matter-era growth with reduced gravitational clustering strength
{title2=$s(f)=(-1+\sqrt{25-24f})/6$}
During matter domination, the growing mode under a reduced clustering strength $1-f$ is
$$
D(t)\propto t^{s(f)},
\qquad
s(f)=\frac{-1+\sqrt{25-24f}}6.
$$
It grows more slowly than the standard $t^{2/3}$ mode whenever $0<f<1$.