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Photon Euler equation
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Branches of physics
Cosmology
Cosmic microwave background
Cosmic microwave background anisotropy
Free-streaming photon Boltzmann equation
Photon Boltzmann hierarchy
Created
2026-09-28
Updated
2026-10-06
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The
dipole
member of the
photon Boltzmann hierarchy
is the
photon Euler equation
. In
Newtonian gauge
and without
collisions
,
Θ
1
′
=
3
k
(
Θ
0
+
Ψ
−
2
Θ
2
)
.
(1)
Ancestors
(8)
Photon Boltzmann hierarchy
Free-streaming photon Boltzmann equation
Cosmic microwave background anisotropy
Cosmic microwave background
Cosmology
Branches of physics
Physics
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Anisotropic stress
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Past exam of the mathematics course of the University of Cambridge
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Photon continuity equation
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