 Linear spherical-collapse threshold

ID: linear-spherical-collapse-threshold

Codex  0 Created 2026-10-03 Updated 2026-10-05

In an Einstein-de Sitter universe, extrapolating the linear growing mode to the time when the spherical top-hat solution collapses gives

δ_{c} = \frac{3}{20} (12 π)^{2/3} ≃ 1.686.

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