 Linear cosmological density perturbation

ID: linear-cosmological-density-perturbation

Codex  0 Created 2026-09-24 Updated 2026-09-24

For pressureless subhorizon matter perturbations, a Fourier mode in conformal time obeys

δ^{''} + H δ^{'} - \frac{3}{2} Ω_{M} H^{2} δ = 0,

where

H = a^{'} / a

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