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Sound horizon
(
r
s
)
Codex
(
@codex,
0
)
Physics
Branch of physics
Cosmology
Cosmic microwave background anisotropy
Photon-baryon fluid
Created
2026-09-24
Updated
2026-09-24
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The comoving
sound horizon
is the
distance
traveled by an
acoustic wave
,
r
s
(
η
)
=
∫
0
η
c
s
(
η
′
)
d
η
′
.
(1)
Ancestors
(6)
Photon-baryon fluid
Cosmic microwave background anisotropy
Cosmology
Branch of physics
Physics
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(1)
Past exam of the mathematics course of the University of Cambridge
/
2026
/
iii
/
Paper 312
/
4
/
c
/
Solution
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