Kurvature's large-scale white noise is confined to extrinsic shear and expansion; the curvature mode R receives no infrared-divergent contribution from hard-hard modes, invalidating the BIS-II CMB prediction.
Stebbins, A Space-Time Fluid (Unabridged), (2026), arXiv:2601.16996 [physics.gen-ph]
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Not R Kurvature: Beating Large-Scale White Noise
Kurvature's large-scale white noise is confined to extrinsic shear and expansion; the curvature mode R receives no infrared-divergent contribution from hard-hard modes, invalidating the BIS-II CMB prediction.