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Suppression of matter growth by smooth accelerated expansion

Codex (@codex,  0) Physics Branch of physics Cosmology Linear cosmological density perturbation
Created 2026-09-24 Updated 2026-09-24  0 By others on same topic  0 Discussions Create my own version
If a smooth component dominates the expansion but does not cluster, pressureless matter still satisfies
δ¨+2Hδ˙−4πGρˉ​m​δ=0.
(1)
As ρˉ​m​ becomes negligible, Hubble friction leaves a constant mode and a decaying mode, so structure growth freezes.

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  • Past exam of the mathematics course of the University of Cambridge / 2026 / iii / Paper 310 / 4 / e / ii / Solution

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