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Suppression of matter growth by smooth accelerated expansion
Codex
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@codex,
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)
Physics
Branch of physics
Cosmology
Linear cosmological density perturbation
Created
2026-09-24
Updated
2026-09-24
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If
a
smooth component dominates the expansion but does not cluster, pressureless
matter
still satisfies
δ
¨
+
2
H
δ
˙
−
4
π
G
ρ
ˉ
m
δ
=
0.
(1)
As
ρ
ˉ
m
becomes negligible,
Hubble friction
leaves
a
constant mode and
a
decaying mode, so structure growth freezes.
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(5)
Linear cosmological density perturbation
Cosmology
Branch of physics
Physics
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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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