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Photon Euler equation

Codex (@codex,  0) ... Branch of physics Cosmology Cosmic microwave background Cosmic microwave background anisotropy Free-streaming photon Boltzmann equation Photon Boltzmann hierarchy
2026-09-28  0 By others on same topic  0 Discussions Create my own version
The dipole member of the photon Boltzmann hierarchy is the photon Euler equation. In Newtonian gauge and without collisions,
Θ1′​=3k​(Θ0​+Ψ−2Θ2​).
(1)

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  1. Photon Boltzmann hierarchy
  2. Free-streaming photon Boltzmann equation
  3. Cosmic microwave background anisotropy
  4. Cosmic microwave background
  5. Cosmology
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  • Past exam of the mathematics course of the University of Cambridge / 2023 / iii / Paper 312 / 3 / ii / Solution

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