CMB Damping Tail · Silk Diffusion
unseel.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
Unseel.com · CMB Damping Tail