= Wayne Hu
{c}
<Wayne Hu> developed physical descriptions of <Cosmic microwave background anisotropy>, including the 1997 damping-tail analysis with <Martin White>. Their work calibrated photon-diffusion and reionization damping while separating model-dependent changes in acoustic structure.<The Damping Tail of CMB Anisotropies by Wayne Hu and Martin White>[Abstract and photon transport analysis]{ref}
<Photon diffusion> smooths fluctuations on scales photons traverse before decoupling. Its angular imprint therefore connects microscopic scattering and the expansion history to the measured small-scale <Cosmic microwave background anisotropy>.
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