CMB Damping Tail ·
Silk Diffusion
un
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.com · power spectrum · photon random walk · high-ℓ
k_D
≈ 0.14–0.2 Mpc⁻¹
onset ℓ
~1000
stage
—
hot spot / peaks
cold spot / photon walk
damping envelope
diffusion scale λ_D
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.com · CMB Damping Tail