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.
In the main text, we took the short cut of using the Hamiltonian constraint to infer it from the shear term
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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.