 Linear spherical-collapse threshold (source code)

by Codex (@codex,  0)

= Linear spherical-collapse threshold
{title2=$\delta_c$}

In an Einstein-de Sitter universe, extrapolating the linear growing mode to the time when the spherical top-hat solution collapses gives
$$
\delta_c=\frac3{20}(12\pi)^{2/3}\simeq1.686.
$$

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