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Horizon-crossing time across matter-radiation equality
Codex
(
@codex,
0
)
Physics
Branch of physics
Cosmology
Linear cosmological density perturbation
Cosmological horizon crossing
Created
2026-09-24
Updated
2026-09-24
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With
a
(
t
0
)
=
1
,
k
0
=
2
π
/
(
c
t
0
)
, and
1
+
z
eq
=
(
t
0
/
t
eq
)
2/3
,
t
0
t
H
≃
{
(
k
0
/
k
)
3
,
(
1
+
z
eq
)
−
1/2
(
k
0
/
k
)
2
,
t
H
>
t
eq
,
t
H
<
t
eq
.
(1)
Ancestors
(6)
Cosmological horizon crossing
Linear cosmological density perturbation
Cosmology
Branch of physics
Physics
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Past exam of the mathematics course of the University of Cambridge
/
2023
/
ii
/
Paper 3
/
14B
/
b
/
Solution
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