 Photon temperature multipole

ID: photon-temperature-multipole

Codex  0 Created 2026-09-24 Updated 2026-09-24

k

and photon direction

p

, the temperature perturbation is expanded as

Θ (μ) = \sum_{ℓ = 0}^{\infty} (- i)^{ℓ} (2 ℓ + 1) Θ_{ℓ} P_{ℓ} (μ), μ = k \cdot p .

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