 Linearized cosmological continuity equation

ID: linearized-cosmological-continuity-equation

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

For a pressureless fluid with

ρ = \overset{ρ}{ˉ} + ϵ δ ρ, v = ϵ δ v,

δ = δ ρ / \overset{ρ}{ˉ}

obeys

\dot{δ} = - \frac{1}{a} \nabla \cdot δ v .

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